Academic Positions Education Awards, scholarships, and honours
Themistoklis (Themis) P. Sapsis Massachusetts Institute of Technology Department of Mechanical Engineering 77 Massachusetts Av., Room 5-318, Cambridge, MA 02139
Phone: +1 617 324 7508 Fax: +1 617 253 8689 Email: [email protected] URL: sandlab.mit.edu
Academic Positions ABS Career Development Assistant Professor
Jul 2013 – Present
Massachusetts Institute of Technology – Mechanical Engineering.
Visiting Scientist
Jul 2012 – Jun 2013
Massachusetts Institute of Technology – Mechanical Engineering.
Assistant Research Scientist
Sep 2011 – Jun 2013
New York University – Courant Institute of Mathematical Sciences, with Prof. A. Majda.
Postdoctoral Research Associate
Nov 2010 – Aug 2011
Massachusetts Institute of Technology – Mechanical Engineering, with Prof. P. Lermusiaux.
Education Ph.D. in Mechanical Engineering
Sept 2006 – Feb 2011
Massachusetts Institute of Technology – Mechanical Engineering. Thesis: ‘Dynamically orthogonal field equations for stochastic fluid flows and particle dynamics’. Advisors: Prof. P. Lermusiaux and Prof. G. Haller. Major: Applied Mechanics, Minor: Fluid Mechanics, GPA: 5.0/5.0.
Diploma in Naval Architecture and Marine Engineering (NAME)
Sep 2001 – Aug 2005
National Technical University of Athens (NTUA) – Greece. Thesis: ‘Stochastic Analysis with Applications to Dynamical Systems’. Advisor: Prof. G. Athanassoulis. Summa cum laude; GPA: 9.41/10 . (Ranked first in class of 2005; Completion of academic program one year earlier).
Awards, scholarships, and honours § § § § § § § § § § § § § § § § § §
Office of Naval Research - Young Investigator Award, 2015. Army Research Office - Young Investigator Award, 2015. Alfred P. Sloan Research Fellow in Ocean Sciences, 2015. Office of Naval Research - Summer Faculty Research Program Fellow, 2015. Recipient of the first American Bureau of Shipping Career Development Chair, MIT, 2013. NSF Travel Award, Foundations of Computational Mathematics – Computational Dynamics Workshop, Budapest, 2011. Best paper award for young scientists, 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. Marie Curie Fellowship from the European Union to attend CF SICON (Stability, Identification and Control) Event - Rome Italy, 2009. Marie Curie Fellowship from the European Union to attend TC4 SICON Event - Lyon France, 2009. MIT Presidential Fellowship ‘George and Marie Vergottis’, academic years 2006-2007 and 2007-2008. RINA (Royal Institution of Naval Architects) – GSCC (Greek Shipping Cooperative Committee) Award for best diploma thesis in class of 2005. ‘Eugenideio’ Foundation Fellowship for ranking first in class of 2005. ‘Venizelou Sfaelou’ Award for ranking first in class of 2005. Four Awards from the Technical Chamber of Greece for the highest GPA on each of the academic years 2001-2005. Four Fellowships from the State Fellowship Foundation of Greece for highest GPA on the academic years 2001-2005. Four awards from NTUA for the highest GPA on each of the academic years 2001-2005. ‘Papakyriakopoulos’ Award for excellence in Mathematics, academic years 2002-2003 and 2001-2002. ‘N. Kritikos’ Award for excellence in Mathematics, academic year 2001-2002.
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NTUA Special Award for best performance in the National Exams for admission to NTUA, Dec 2001 (Best performance over 2500 students who were admitted to NTUA). Bronze medal in the Greek Physics Society Contest, Aug 2001.
Journal Papers (Students and Postdoctoral Scholars underlined) 1. 2. 3. 4.
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H. Babaee, T. Sapsis, A variational principle for the description of time-dependent modes associated with transient instabilities, Submitted (2015). H. -K. Joo, T. Sapsis, A moment-equation-copula closure method for nonlinear vibrational systems subjected to correlated noise, Submitted (2015). W. Cousins, T. Sapsis, Reduced order precursors of rare events in unidirectional nonlinear water waves, Submitted (2015). M. Mohamad, T. Sapsis, Probabilistic description of extreme events in intermittently unstable dynamical systems excited by correlated stochastic processes, SIAM/ASA Journal on Uncertainty Quantification, 3 (2015) 709-736. W. Cousins, T. Sapsis, Localized instabilities in unidirectional deep water wave envelope equations, Physical Review E, 91 (2015) 063204. J. Kluger, T. Sapsis, A. Slocum, A high-resolution and large force-range load cell by means of nonlinear cantilever beams, Precision Engineering, In press (2015). A. Petsakou, T. Sapsis, J. Blau, Rhythmic Rho1 activity regulates pacemaker neuron structural plasticity and seasonal adaptation, Cell, 162 (2015) 1-13. J. Kluger, T. Sapsis, A. Slocum, Robust energy harvesting from walking vibrations by means of nonlinear cantilever beams, J. Sound Vib., 341 (2015) 174-194. H.-K. Joo, T. Sapsis, Performance measures for single-degree-of-freedom energy harvesters under stochastic excitation, J. Sound Vib. 313 (2014) 4695-4710. M. Choi, T. Sapsis, G. E. Karniadakis, On the equivalence of dynamically orthogonal and dynamically biorthogonal methods: Theory and Numerical simulations, J. Comp. Phys., 270 (2014) 1-20. K. Remick, H.-K. Joo, D.M. McFarland, T. Sapsis, L. Bergman, D. D. Quinn, A. Vakakis, Sustained HighFrequency Energy Harvesting Through a Strongly Nonlinear Electromechanical System Under Single and Repeated Impulsive Excitations, J. Sound Vib. 333 (2014) 3214-3235. W. Cousins, and T. Sapsis, Quantification and prediction of extreme events in a one-dimensional nonlinear dispersive wave model, Physica D, 280-281 (2014) 48-58. A. Majda, D. Qi, T. Sapsis, Blended particle filters for large dimensional chaotic dynamical systems, Proceedings of the National Academy of Sciences, 111 (2014) 7511-7516. T. Sapsis, and A. Majda, Statistically Accurate Low Order Models for Uncertainty Quantification in Turbulent Dynamical Systems, Proceedings of the National Academy of Sciences, 110 (2013) 13705-13710. (2013). K. Remick, A. Vakakis, L. Bergman, D.M. McFarland, D.D. Quinn, T. Sapsis, Sustained High-Frequency Dynamic Instability of a Nonlinear System of Coupled Oscillators Forced by Single or Repeated Impulses: Theoretical and Experimental Results, ASME J. Vibrations and Acoustics, 136 011013 (2014). T. Sapsis, M. Ueckermann, P. Lermusiaux, Global Analysis of Navier-Stokes and Boussinesq Stochastic Flows using Dynamical Orthogonality, Journal of Fluid Mechanics, 734 (2013) 83-113. T. Sapsis, and A. Majda, Blended algorithms based on modified quasi-Gaussian closure and dynamical orthogonality for uncertainty quantification of linearly unstable stochastic attractors, Journal of Nonlinear Science, 23 1039-1071 (2013). M. Choi, T. Sapsis, G. E. Karniadakis, Evolution Equations for Time-Evolving Stochastic Modes in Polynomial Chaos - A Convergence Study, J. Comp. Phys., 245 (2013) 281-301. T. Sapsis, and A. Majda, Blended reduced subspace algorithms for uncertainty quantification of quadratic systems with a stable mean state, Physica D, 258 (2013) 61-76. T. Sapsis, and A. Majda, A statistically accurate modified quasi-linear Gaussian closure for uncertainty quantification in turbulent dynamical systems, Physica D, 252 (2013) 34-45. T. Sapsis, Attractor local dimensionality, nonlinear energy transfers, and finite-time instabilities in unstable dynamical systems with applications to 2D fluid flows, Proceedings of the Royal Society A, 469 (2013) 2153. T. Sapsis, and H. A. Dijkstra, Interaction of external stochastic excitation and nonlinear dynamics in winddriven ocean circulation flows, Journal of Physical Oceanography, 43 (2013) 366. M. Ueckermann, P. Lermusiaux, T. Sapsis, Numerical Schemes for Dynamically Orthogonal Equations of Stochastic Fluid and Ocean Flows, J. Comp. Phys., 233 (2013) 272-294. D. Venturi, T. Sapsis, H. Cho, and G. E. Karniadakis, A computable evolution equation for the joint response-excitation probability density function of stochastic dynamical systems, Proceedings of the Royal Society A, 468, (2012) 759.
25. T. Sapsis, D. Quinn, A. Vakakis, and L. Bergman, Effective Stiffening and Damping Enhancement of Structures with Strongly Nonlinear Local Attachments, ASME J. Vibrations and Acoustics, 134 (2012) 011016. 26. T. Sapsis, and P. Lermusiaux, Dynamical criteria for the evolution of the stochastic dimensionality in flows with uncertainty, Physica D, 241 (2012) 60-76. 27. T. Sapsis, N. Ouellette, J. Gollub, G. Haller, Neutrally buoyant particle dynamics in fluid flows: Comparison of Experiments with Lagrangian stochastic models, Physics of Fluids, 23 (2011) 093304. 28. G. Haller & T. Sapsis, Lagrangian Coherent Structures and the Smallest Finite-Time Lyapunov Exponent, Chaos, 21 (2011) 023115. 29. T. Sapsis, J. Peng, & G. Haller, Predator-Prey interactions in jellyfish feeding, Bulletin of Mathematical Biology, 73 (2011) 1841-1856. 30. T. Sapsis, A. Vakakis, & L. Bergman, Effect of Stochasticity on Targeted Energy Transfer from a Linear Medium to a Strongly Nonlinear Attachment, Probabilistic Engineering Mechanics, 26 (2011) 119-133. 31. O. Gendelman, T. Sapsis, A. Vakakis, L. Bergman, Radical Enhancement of Passive Targeted Energy Transfer in Strongly Nonlinear Mechanical Oscillators, J. Sound Vib., 330 (2011) 1. 32. T. Sapsis & A. Vakakis, Subharmonic orbits of a strongly nonlinear oscillator forced by closely spaced harmonics, J. Computational and Nonlinear Dynamics, 6 (2011) 011014. 33. G. Haller & T. Sapsis, Localized instability and attraction along invariant manifolds, SIAM Journal of Appl. Dynamical Systems, 9 (2010) 611-633. 34. T. Sapsis & G. Haller, Clustering Criterion for Inertial Particles in 2D Time-Periodic and 3D Steady Flows, Chaos, 20 (2010) 017515. 35. T. Sapsis & P. Lermusiaux, Dynamically orthogonal field equations for continuous stochastic dynamical systems, Physica D, 238 (2009) 2347-2360. 36. T. Sapsis, A. Vakakis, O. Gendelman, L. Bergman, G. Kerschen, & D. Quinn. Efficiency of targeted energy transfers in coupled nonlinear oscillators associated with 1:1 resonance captures: Part II, Analytical study, J. Sound Vib., 325 (2009) 297-320. 37. T. Sapsis & G. Haller, Inertial particle dynamics in a hurricane, J. Atmosph. Sci., 66 (2009) 2481-2492. 38. D. Quinn, O. Gendelman, G. Kerschen, T. Sapsis, L. Bergman, & A. Vakakis. Efficiency of Targeted Energy Transfers in Coupled Nonlinear Oscillators Associated with 1:1 Resonance Captures: Part I, J. Sound Vib., 311 (2008) 1228. 39. G. Haller & T. Sapsis, Where do inertial particles go in fluid flows? Physica D, 237 (2008) 573-583. 40. T. Sapsis & G. Haller, Instabilities in the dynamics of neutrally buoyant particles. Phys. Fluids, 20 (2008) 017102. 41. T. Sapsis & G. Athanassoulis, New partial differential equations governing the response-excitation joint probability distributions of nonlinear systems under general stochastic excitation, Probabilistic Engineering Mechanics, 23 (2008) 289.
Patents 1.
J.M. Kluger, T.P. Sapsis, A.H. Slocum, Beam-based nonlinear spring, (2015) Submitted.
Invited Seminars 1. 2. 3. 4.
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Technion Israel Institute of Technology – Mechanical Engineering. Quantification and prediction of rogue waves in the ocean. Host: Prof. O. Gendelman. Cargèse International School 2015: Rogue and shock waves in nonlinear dispersive media, July 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. M. Onorato. Naval Surface Warfare Center – Carderock Technical Seminar Series, July 2015. Extreme values of response of dynamical systems akin to ship motions. Host: Dr. V. Belenky. New Jersey Institute of Technology – Department of Mathematics. Workshop on Applied and Computational Mathematics, June 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. David Shirokoff. Swiss Federal Institute of Technology (ETH), June 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. P. Koumoutsakos & C. Schwab. Worcester Polytechnic Institute – Mathematics Colloquium, April, 2015, Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. M. Sarkis. University of Wisconsin-Madison – Department of Mathematics. Workshop on Uncertainty quantification in kinetic and hyperbolic problems, March 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. Shi Jin. University of Florida at Gainesville - Department of Mechanical and Aerospace Engineering, March, 2015, Quantification and prediction of nonlinear waves in the ocean. Host: Prof. K. Mohseni.
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City College of New York - Department of Mechanical Engineering, October, 2014. Quantification and prediction of rogue waves in the ocean. Host: Prof. Y. Andreopoulos. New York University - Courant Institute of Mathematical Sciences (CAOS), October, 2014. Quantification and prediction of rogue waves in the ocean. Host: Prof. S. Smith. Center for Environmental Sensing And Modeling, Singapore-MIT Alliance for Research and Technology Interdisciplinary Research Group Seminar Series, June, 2014. Analytical and computational methods for systems with intermittent and persistent instabilities: applications to the quantification of extreme events and efficient energy harvesting. Host: Prof. N. Patrikalakis. American Bureau of Shipping, April 10, 2014. Analytical and Computational Methods for Stochastic Systems with Intermittent or Persistent Instabilities in Naval Architecture and Ocean Engineering. Host: Dr. Richard Korpus. Pacific Northwest National Laboratory, Computational Sciences & Mathematics Division Seminar Series, March 24, 2014. Order-reduction and uncertainty quantification using dynamical orthogonality with applications on the stochastic modeling of chaotic fluid flows. Host: Prof. G. Karniadakis. MIT, Department of Aeronautics and Astronautics, ACDL Seminar, November 15, 2013. Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. Jaime Peraire. Brown University, Center for Fluid Mechanics, November 5, 2013. Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. Brad Marston. American Bureau of Shipping, June 20, 2013. Quantifying higher-order statistics and extreme events in wave models. Host: Mr. Todd Grove. American Bureau of Shipping, June 19, 2013. Stochastic systems in the ocean and marine environment. Host: Mr. Todd Grove. Institute for Mathematics and its Applications – University of Minnesota, Workshop on Stochastic Modeling of the Oceans and Atmospheres, March 13, 2013. A statistically accurate modified quasilinear Gaussian closure for uncertainty quantification in turbulent dynamical systems. Host: A. Majda National Technical University of Athens, Joint Seminar – Dept. of Naval Architecture and Marine Engineering and Dept. of Applied Mathematics, January 10, 2013. Uncertainty quantification (UQ) in laminar and turbulent systems using blended subspace closures. Host: Prof. G. Athanassoulis. US Naval Undersea Warfare Center, December 2012, Uncertainty quantification (UQ) in laminar and turbulent systems using blended subspace closures. Host: Dr. D. Steinbrecher. New York University, Workshop on Uncertainty Quantification and Inverse Problems, November 30, 2012, Blended Reduced Subspace Methods for Uncertainty Quantification of Unstable Stochastic Systems. Host: Prof. A. Majda. Institute for Computational and Experimental Research in Mathematics (ICERM), Providence October 2012, Workshop on Uncertainty Quantification. Blended Reduced Subspace Methods for Uncertainty Quantification of Unstable Stochastic Systems. Invitation by Organizing Committee. EGU General Assembly, Vienna 2012, Special Session: Contributions of young stars in the field of Nonlinear Processes in Geosciences. Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. Invitation by EGU Organizing Committee. Fudan University, Shanghai 2012, International Workshop on long time stochastic and statistical approximations for turbulent dynamical systems, May 24, 2012, Blended Reduced Subspace Algorithms for Uncertainty Quantification. Host: Prof. J. Cheng. Northwestern University, Department of Physics and Astronomy - Complex Systems seminar series, April 5, 2012, Dynamics of finite-size particles in general fluid flows with applications. Host: Prof. A. Motter. McGill University, Department of Mathematics Seminar Series, March 21, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid flows, Host: Prof. G. Haller. École Polytechnique Fédérale de Lausanne, Department of Mechanical Engineering, March 16, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid flows, Host: Prof. I. Botsis. Massachusetts Institute of Technology, Department of Mechanical Engineering, February 28, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid and mechanical systems, Host: Prof. M. Triantafyllou. Harvard University, School of Engineering and Applied Sciences, February 23, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid and mechanical systems, Host: Prof. L. Mahadevan. Utrecht University, Department of Physics and Astronomy, Aug 4, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. H. Dijkstra. Foundations of Computational Mathematics (FoCM), Budapest 2011, Computational Dynamics Workshop, July 12, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. B. Garay.
32. University of Illinois at Urbana-Champaign, Aerospace Engineering Seminar, March 14, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. L. Bergman. 33. Princeton University, Mechanical & Aerospace Engineering, January 14, 2011, Dynamically orthogonal field equations for stochastic dynamical systems with applications. Host: Prof. C. Rowley. 34. Brown University, Division of Applied Mathematics, December 10, 2010, Dynamical systems subjected to general stochastic excitation: A new class of equations for the evolution of probability distributions based on the Hopf approach. Host: Prof. G. Karniadakis. 35. Brown University, Division of Applied Mathematics, July 6, 2010, Dynamically orthogonal field equations for stochastic flows. Host: Prof. G. Karniadakis. 36. University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, April 2, 2010, Finite size particles in 3D flows: Theory & Applications. Host: Prof. H. Dankowicz. 37. New York University, Courant Institute of Mathematical Sciences, November 13, 2009, Dynamics of inertial particles in fluid flows. Host: Dr. S. Keating. 38. University of Illinois at Urbana-Champaign, Joint Civil Engineering and Aerospace Engineering Seminar, October 6, 2009, Dynamically orthogonal field equations for continuous stochastic dynamical systems. Host: Prof. A. Masud. 39. Woods Hole Oceanographic Institution, Geophysical Fluid Dynamics Program, July 10, 2009, Dynamics of inertial particles in fluid flows. Host: Prof. O. Buhler. 40. Massachusetts Institute of Technology, Center for Ocean Engineering: Joint VFRL-Towtank Seminar Series, February 25, 2009, Inertial particles motion in arbitrary fluid flows. Host: A. Kalmikov. 41. University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, October 13, 2008, Where Do Inertial Particles Go in Fluid Flows?. Host: Prof. A. Vakakis. 42. Max Planck Institute, Dresden, Dynamics of Inertial Particles: From Ocean and Atmosphere to Planets, Germany, 2008, Instabilities on the dynamics of inertial particles: Applications. (Invitation by Organizers). 43. Mathematisches Forschungsinstitut Oberwolfach, Germany, Workshop on Applied Dynamics and Geometric Mechanics, Instabilities on the dynamics of inertial particles in hurricane Isabel. Invitation by organizer Prof. Jerry Marsden. 44. Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, February 13, 2006, New partial differential equations governing the response-excitation joint probability distributions for nonlinear systems under regular stochastic excitation. Host: Prof. K. Sobczyk.
Conference Proceeding Papers and Book Chapters 1. 2. 3.
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M. Mohamad, T. P. Sapsis, Analytical approximation of the heavy-tail structure for intermittently unstable complex modes, Proceedings of the Dynamic Data Driven environmental System Science Conference, Cambridge, Massachusetts, Springer, 2015. W. Cousins, T. P. Sapsis, Reduced order probabilistic prediction of rogue waves in 1D envelope equations, Proceedings of the Dynamic Data Driven environmental System Science Conference, Cambridge, Massachusetts, Springer, 2015. H. K. Joo, T. P. Sapsis, Performance barriers for single-degree-of-freedom energy harvesters under generic stochastic excitation, Proceedings of the ASME 2014 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, IDETC/CIE 2014, Invited for MSNDC11-1 Nonlinear Energy Transfers and Harvesting, Buffalo, New York, August, 2014. W. Cousins, T. P. Sapsis, Quantification and prediction of intermittent events in nonlinear dispersive waves, 8th European Nonlinear Dynamics Conference, Invited for MS-3 Computational Methods, Vienna, Austria, 2014. H. K. Joo, T. P. Sapsis, Performance measures for SDOF energy harvesters under stochastic excitation, 8th European Nonlinear Dynamics Conference, Invited for MS-15 Energy Transfer and Harvesting in Nonlinear Systems, Vienna, Austria, 2014. T. Sapsis, A. Vakakis, and L. Bergman, Targeted energy transfer between dynamical components due to essential nonlinearities, Proceedings of ICOSSAR 2013: 11th International Conference on Structural Safety and Reliability, New York, 2013. T. Sapsis, A. Vakakis, and L. Bergman, Effect of stochasticity on targeted energy transfer from a linear medium to a strongly nonlinear attachment, 7th EUROMECH Conference ENOC, Rome, Italy, 2011. T. Sapsis, and P. Lermusiaux, Dynamically orthogonal field equations for stochastic fluid flows, 7th EUROMECH Conference ENOC, Rome, Italy, 2011. T. Sapsis, and P. Lermusiaux, Dynamically orthogonal field equations for stochastic continuous media, Proceedings of USNCTAM 2010: 16th US National Congress Of Theoretical And Applied Mechanics, 2010.
10. T. Sapsis, A. Vakakis, and L. Bergman, Effect of stochasticity on targeted energy transfer from a linear medium to a strongly nonlinear attachment, Proceedings of USNCTAM 2010: 16th US National Congress Of Theoretical And Applied Mechanics, 2010.
11. T. Sapsis, S. Koloutsou-Vakakis, M. Rood, B. Kim, and M. Kemme, Fugitive Dust Dispersion Using LIDAR Measurements and a Stochastic Lagrangian Model, in Air & Waste Management Association's Annual Conference and Exhibition, Calgary, AB, 2010. 12. T. Sapsis, and G. Haller, Clustering of inertial particles in 3D steady flows, in ‘Chaotic Systems: Theory and Applications’, C. H. Skiadas and I. Dimotikalis (Editors), World Scientific, 2010. 13. T. Sapsis and A. Vakakis, Targeted energy transfer in general linear waveguides: A unified integrodifferential equation formulation with applications, Euromech Colloquium 503: Nonlinear Normal Modes, Dimension Reduction & Localization, Frascati, Italy, 2009. 14. T. Sapsis and A. Vakakis, Targeted energy transfer in general linear waveguides: A unified integrodifferential equation formulation with applications, SICON CF: Nonlinear Dynamics, Stability, Identification and Control, University of Rome ‘La Sapienza’, Italy. 2009. 15. T. Sapsis and G. Haller, Clustering of inertial particles in 3D steady flows, Proceedings of the 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. 16. T. Sapsis and P. Lermusiaux, Reduced order evolution equations for stochastic fluid flows, Proceedings of the 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. 17. T. Sapsis, A.F. Vakakis, O.V. Gendelman, L.A. Bergman, G. Kerschen, D.D. Quinn, Efficiency of Targeted Energy Transfers in Coupled Nonlinear Oscillators Associated with 1:1 Resonance Captures, Proceedings of the Society of Engineering Science, 45th Annual Technical Meeting, Urbana-Champaign, Illinois, 2008. 18. T. Sapsis, D. D. Quinn, O. Gendelman, A. Vakakis, L. Bergman, and G. Kerschen, Applying L. Manevitch’s Complexification – Averaging method to analyze conditions for optimal Targeted Energy Transfer in coupled oscillators with essential stiffness nonlinearity. Proceedings of the International Conference on Nonlinear Phenomena in Polymer Solids and Low-dimensional Systems, Moscow, Russia, 2008. 19. T. Sapsis, and G. Haller, Inertial particles motion in geophysical fluid flows. Proceedings of the Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersburg, Russia, 2008. 20. T. Sapsis, D. D. Quinn, O. Gendelman, A. Vakakis, L. Bergman, and G. Kerschen, Efficient Targeted Energy Transfer in nonlinear oscillators. Proceedings of the Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersburg, Russia, 2008. 21. T. Sapsis, and G. Athanassoulis, New partial differential equations governing the joint response-excitation, probability distributions of nonlinear systems, under general stochastic excitation, Part I, II. Proceedings of the 5th International Conference on Computational Stochastic Mechanics (CSM-5), Rhodes, Greece, 2006.
Invited Conference Talks without Proceedings § 9th AIMS Conference on Dynamical Systems, Differential Equations, and Applications, Orlando, FL, USA, July, 2012, Special Session SS27: Transport Barriers in Dynamical Systems, Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. § 9th AIMS Conference on Dynamical Systems, Differential Equations, and Applications, Orlando, FL, USA, July, 2012, Special Session SS20: Stochastic Statistical Modelling of Climate, Blended Reduced Subspace Algorithms for Uncertainty Quantification. § SIAM Conference on Uncertainty Quantification, Raleigh, NC, USA, April, 2012, Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. § 11th International Conference on Applications of Statistics and Probability in Civil Engineering, ETH Zurich, Switzerland, 2011, Dynamically orthogonal field equations for stochastic fluid flows. § European Geophysical Union – General Assembly 2010, Vienna, Austria, 2010, Inertial Lagrangian coherent structures in general unsteady flows. § SICON CF: Nonlinear Dynamics, Stability, Identification and Control, University of Rome ‘La Sapienza’, Italy, 2009, Stochastic targeted energy transfer in coupled nonlinear oscillators. § Bifurcations and Instabilities in Fluid Dynamics, Third International Symposium, University of Nottingham, UK, 2009, Instabilities on the dynamics of neutrally buoyant particles. § XXXVII Summer School: APM’ 2009, Advanced Problem in Mechanics, St. Petersburg (Repino), Russia, 2009. Local instabilities along invariant manifolds with applications to mechanics, fluids and biology. § SIAM Conference on Applications of Dynamical Systems, Snowbird, Utah, 2009. Stability and Instability in the Dynamics of Inertial Particles. § Atmosphere-Ocean Science Days, Courant Institute of Mathematical Sciences, New York, 2009. Dynamically orthogonal fields equations for distributed stochastic dynamical systems. § Division of Fluid Dynamics Meeting, San Antonio, Texas, 2008, Dynamics of finite-size particles in fluid flows. § Dynamics of Inertial Particles: From Ocean and Atmosphere to Planets, Max Planck Institute, Dresden, Germany, 2008, Instabilities on the dynamics of inertial particles: Applications. § Applied Dynamics and Geometric Mechanics, Mathematisches Forschungsinstitut Oberwolfach, Germany, 2008 Instabilities on the dynamics of inertial particles in hurricane Isabel. § 2nd International Conference on Nonlinear Normal Modes and Localization in Vibrating Systems, Samos, Greece, 2006, Probabilistic Responses of Dynamical Systems under smooth stochastic excitation: A unified approach based on Hopf equations.
Teaching Fall 2015: MIT Undergraduate Course 2.003 Dynamics. Spring 2015: MIT Graduate Course 2.081 Plates and Shells. Fall 2014: MIT Course 2.701 Principles of Naval Architecture. Spring 2014: MIT Graduate Course 2.081 Plates and Shells. Fall 2013: MIT Course 2.701 Principles of Naval Architecture. Spring 2012: NYU-Courant Institute of Mathematical Sciences, Guest lecturer for the graduate course Filtering of turbulent dynamical systems. Fall 2011: NYU-Courant Institute of Mathematical Sciences, Guest lecturer for the graduate course Quantifying Uncertainty in Complex Systems. Fall 2010: Guest lecturer for the graduate course Advanced Nonlinear Dynamics and Chaos at MIT-Mechanical Eng. Fall 2009: Guest lecturer for the undergraduate course Nonlinear Dynamics at MIT Fall 2009: Teaching Assistant for the graduate course Numerical Fluid Mechanics at MIT-Mechanical Eng. Spring 2006: Teaching Assistant for the undergraduate course Marine Hydrodynamics at SNAME (NTUA) Spring 2005: Lecturer for the graduate course Stochastic Modeling of Physical Phenomena at the School of Applied Mathematics and Physics of NTUA. Fall 2003: Teaching Assistant for the undergraduate course Introduction to Computing at SNAME (NTUA)
Students Graduate (5): Han Kyul Joo (MSc ‘14); Jocelyn Kluger (MSc ‘14); Mustafa Mohamad (MSc ‘15); Zhong Yi Wan (MSc ‘16); Saviz Mowlavi (MSc ’15) Undergraduate (2): Katy Evans (BSc ‘14); Henry Merrow (BSc ‘17); Sara Falcone (BSc ‘15); Trevor Day (BSc ‘17) Postdocs (3): Will Cousins (2013-2015); Hessameddin Babaee (2013-2016); Mohammad Farazmand (2015-2017) Thesis Reader (4): Minseok Choi (Brown University, PhD ‘14); Patrick Blonigan (MIT, PhD ‘16); Heyrim Cho (Brown University, PhD ‘15); Alessio Spantini (MIT, PhD ‘17).
Professional Activities Editorial Board • Journal of Ocean and Wind Energy (2014 – Present) Journal Reviewer Proceedings of the Royal Society A; Journal of Nonlinear Science; Physica D; Journal of Computational Physics; Physics of Fluids; SIAM Journal on Scientific Computing; Journal of Physical Oceanography; Journal of Fluid Mechanics; International Journal of Bifurcation and Chaos; Chaos; Probabilistic Engineering Mechanics; Ocean Dynamics; Engineering Applications of Computational Fluid Dynamics; Archive of Applied Mechanics; Journal of Applied Mechanics; International Journal of Nonlinear Mechanics; Numerical Algorithms; Engineering Applications of Computational Fluid Mechanics; Physics of Plasmas; Communications in Nonlinear Science and Numerical Simulation. Professional Societies Membership • Society of Industrial and Applied Mathematics • American Society of Mechanical Engineers • American Physical Society • International Society of Offshore and Polar Engineers • Society of Naval Architects and Marine Engineers Organizer • Organizer and Member of the Technical Program Committee for ISOPE – 2015 Conference, Kona, Big Island, Hawaii. • Organizing Committee for the “13th International Probabilistic Workshop (IPW 2015)”, Liverpool, UK, 2015. • Session Chair in the technical session “Nonlinear Energy Transfers and Harvesting” in the ASME 2014 International Design & Engineering Technical Conference, Buffalo, New York, 2014. • Organizer of the mini-symposium “Computational Methods” for the 8th European Nonlinear Dynamics Conference, Vienna, Austria, 2014. • Organizer of the mini-symposium “Uncertainty quantification of turbulent systems in reduced-order subspaces” for the SIAM Uncertainty Quantification Conference, Savannah, Georgia, 2014.
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Organizer of the seminar series: “Stochastic Analysis and Nonlinear Dynamics” in Mechanical Engineering Department – MIT (2013 – Present).
Judge • Judge for The MIT Mechanical Engineering de Florez Award Competition (2014). • Panelist for NSF Fluid Dynamics (FD) program (2014). • Judge for the MIT Clean Energy Prize (2014). Last updated on November 5, 2015
Phone: +1 617 324 7508 Fax: +1 617 253 8689 Email: [email protected] URL: sandlab.mit.edu
Academic Positions ABS Career Development Assistant Professor
Jul 2013 – Present
Massachusetts Institute of Technology – Mechanical Engineering.
Visiting Scientist
Jul 2012 – Jun 2013
Massachusetts Institute of Technology – Mechanical Engineering.
Assistant Research Scientist
Sep 2011 – Jun 2013
New York University – Courant Institute of Mathematical Sciences, with Prof. A. Majda.
Postdoctoral Research Associate
Nov 2010 – Aug 2011
Massachusetts Institute of Technology – Mechanical Engineering, with Prof. P. Lermusiaux.
Education Ph.D. in Mechanical Engineering
Sept 2006 – Feb 2011
Massachusetts Institute of Technology – Mechanical Engineering. Thesis: ‘Dynamically orthogonal field equations for stochastic fluid flows and particle dynamics’. Advisors: Prof. P. Lermusiaux and Prof. G. Haller. Major: Applied Mechanics, Minor: Fluid Mechanics, GPA: 5.0/5.0.
Diploma in Naval Architecture and Marine Engineering (NAME)
Sep 2001 – Aug 2005
National Technical University of Athens (NTUA) – Greece. Thesis: ‘Stochastic Analysis with Applications to Dynamical Systems’. Advisor: Prof. G. Athanassoulis. Summa cum laude; GPA: 9.41/10 . (Ranked first in class of 2005; Completion of academic program one year earlier).
Awards, scholarships, and honours § § § § § § § § § § § § § § § § § §
Office of Naval Research - Young Investigator Award, 2015. Army Research Office - Young Investigator Award, 2015. Alfred P. Sloan Research Fellow in Ocean Sciences, 2015. Office of Naval Research - Summer Faculty Research Program Fellow, 2015. Recipient of the first American Bureau of Shipping Career Development Chair, MIT, 2013. NSF Travel Award, Foundations of Computational Mathematics – Computational Dynamics Workshop, Budapest, 2011. Best paper award for young scientists, 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. Marie Curie Fellowship from the European Union to attend CF SICON (Stability, Identification and Control) Event - Rome Italy, 2009. Marie Curie Fellowship from the European Union to attend TC4 SICON Event - Lyon France, 2009. MIT Presidential Fellowship ‘George and Marie Vergottis’, academic years 2006-2007 and 2007-2008. RINA (Royal Institution of Naval Architects) – GSCC (Greek Shipping Cooperative Committee) Award for best diploma thesis in class of 2005. ‘Eugenideio’ Foundation Fellowship for ranking first in class of 2005. ‘Venizelou Sfaelou’ Award for ranking first in class of 2005. Four Awards from the Technical Chamber of Greece for the highest GPA on each of the academic years 2001-2005. Four Fellowships from the State Fellowship Foundation of Greece for highest GPA on the academic years 2001-2005. Four awards from NTUA for the highest GPA on each of the academic years 2001-2005. ‘Papakyriakopoulos’ Award for excellence in Mathematics, academic years 2002-2003 and 2001-2002. ‘N. Kritikos’ Award for excellence in Mathematics, academic year 2001-2002.
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NTUA Special Award for best performance in the National Exams for admission to NTUA, Dec 2001 (Best performance over 2500 students who were admitted to NTUA). Bronze medal in the Greek Physics Society Contest, Aug 2001.
Journal Papers (Students and Postdoctoral Scholars underlined) 1. 2. 3. 4.
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H. Babaee, T. Sapsis, A variational principle for the description of time-dependent modes associated with transient instabilities, Submitted (2015). H. -K. Joo, T. Sapsis, A moment-equation-copula closure method for nonlinear vibrational systems subjected to correlated noise, Submitted (2015). W. Cousins, T. Sapsis, Reduced order precursors of rare events in unidirectional nonlinear water waves, Submitted (2015). M. Mohamad, T. Sapsis, Probabilistic description of extreme events in intermittently unstable dynamical systems excited by correlated stochastic processes, SIAM/ASA Journal on Uncertainty Quantification, 3 (2015) 709-736. W. Cousins, T. Sapsis, Localized instabilities in unidirectional deep water wave envelope equations, Physical Review E, 91 (2015) 063204. J. Kluger, T. Sapsis, A. Slocum, A high-resolution and large force-range load cell by means of nonlinear cantilever beams, Precision Engineering, In press (2015). A. Petsakou, T. Sapsis, J. Blau, Rhythmic Rho1 activity regulates pacemaker neuron structural plasticity and seasonal adaptation, Cell, 162 (2015) 1-13. J. Kluger, T. Sapsis, A. Slocum, Robust energy harvesting from walking vibrations by means of nonlinear cantilever beams, J. Sound Vib., 341 (2015) 174-194. H.-K. Joo, T. Sapsis, Performance measures for single-degree-of-freedom energy harvesters under stochastic excitation, J. Sound Vib. 313 (2014) 4695-4710. M. Choi, T. Sapsis, G. E. Karniadakis, On the equivalence of dynamically orthogonal and dynamically biorthogonal methods: Theory and Numerical simulations, J. Comp. Phys., 270 (2014) 1-20. K. Remick, H.-K. Joo, D.M. McFarland, T. Sapsis, L. Bergman, D. D. Quinn, A. Vakakis, Sustained HighFrequency Energy Harvesting Through a Strongly Nonlinear Electromechanical System Under Single and Repeated Impulsive Excitations, J. Sound Vib. 333 (2014) 3214-3235. W. Cousins, and T. Sapsis, Quantification and prediction of extreme events in a one-dimensional nonlinear dispersive wave model, Physica D, 280-281 (2014) 48-58. A. Majda, D. Qi, T. Sapsis, Blended particle filters for large dimensional chaotic dynamical systems, Proceedings of the National Academy of Sciences, 111 (2014) 7511-7516. T. Sapsis, and A. Majda, Statistically Accurate Low Order Models for Uncertainty Quantification in Turbulent Dynamical Systems, Proceedings of the National Academy of Sciences, 110 (2013) 13705-13710. (2013). K. Remick, A. Vakakis, L. Bergman, D.M. McFarland, D.D. Quinn, T. Sapsis, Sustained High-Frequency Dynamic Instability of a Nonlinear System of Coupled Oscillators Forced by Single or Repeated Impulses: Theoretical and Experimental Results, ASME J. Vibrations and Acoustics, 136 011013 (2014). T. Sapsis, M. Ueckermann, P. Lermusiaux, Global Analysis of Navier-Stokes and Boussinesq Stochastic Flows using Dynamical Orthogonality, Journal of Fluid Mechanics, 734 (2013) 83-113. T. Sapsis, and A. Majda, Blended algorithms based on modified quasi-Gaussian closure and dynamical orthogonality for uncertainty quantification of linearly unstable stochastic attractors, Journal of Nonlinear Science, 23 1039-1071 (2013). M. Choi, T. Sapsis, G. E. Karniadakis, Evolution Equations for Time-Evolving Stochastic Modes in Polynomial Chaos - A Convergence Study, J. Comp. Phys., 245 (2013) 281-301. T. Sapsis, and A. Majda, Blended reduced subspace algorithms for uncertainty quantification of quadratic systems with a stable mean state, Physica D, 258 (2013) 61-76. T. Sapsis, and A. Majda, A statistically accurate modified quasi-linear Gaussian closure for uncertainty quantification in turbulent dynamical systems, Physica D, 252 (2013) 34-45. T. Sapsis, Attractor local dimensionality, nonlinear energy transfers, and finite-time instabilities in unstable dynamical systems with applications to 2D fluid flows, Proceedings of the Royal Society A, 469 (2013) 2153. T. Sapsis, and H. A. Dijkstra, Interaction of external stochastic excitation and nonlinear dynamics in winddriven ocean circulation flows, Journal of Physical Oceanography, 43 (2013) 366. M. Ueckermann, P. Lermusiaux, T. Sapsis, Numerical Schemes for Dynamically Orthogonal Equations of Stochastic Fluid and Ocean Flows, J. Comp. Phys., 233 (2013) 272-294. D. Venturi, T. Sapsis, H. Cho, and G. E. Karniadakis, A computable evolution equation for the joint response-excitation probability density function of stochastic dynamical systems, Proceedings of the Royal Society A, 468, (2012) 759.
25. T. Sapsis, D. Quinn, A. Vakakis, and L. Bergman, Effective Stiffening and Damping Enhancement of Structures with Strongly Nonlinear Local Attachments, ASME J. Vibrations and Acoustics, 134 (2012) 011016. 26. T. Sapsis, and P. Lermusiaux, Dynamical criteria for the evolution of the stochastic dimensionality in flows with uncertainty, Physica D, 241 (2012) 60-76. 27. T. Sapsis, N. Ouellette, J. Gollub, G. Haller, Neutrally buoyant particle dynamics in fluid flows: Comparison of Experiments with Lagrangian stochastic models, Physics of Fluids, 23 (2011) 093304. 28. G. Haller & T. Sapsis, Lagrangian Coherent Structures and the Smallest Finite-Time Lyapunov Exponent, Chaos, 21 (2011) 023115. 29. T. Sapsis, J. Peng, & G. Haller, Predator-Prey interactions in jellyfish feeding, Bulletin of Mathematical Biology, 73 (2011) 1841-1856. 30. T. Sapsis, A. Vakakis, & L. Bergman, Effect of Stochasticity on Targeted Energy Transfer from a Linear Medium to a Strongly Nonlinear Attachment, Probabilistic Engineering Mechanics, 26 (2011) 119-133. 31. O. Gendelman, T. Sapsis, A. Vakakis, L. Bergman, Radical Enhancement of Passive Targeted Energy Transfer in Strongly Nonlinear Mechanical Oscillators, J. Sound Vib., 330 (2011) 1. 32. T. Sapsis & A. Vakakis, Subharmonic orbits of a strongly nonlinear oscillator forced by closely spaced harmonics, J. Computational and Nonlinear Dynamics, 6 (2011) 011014. 33. G. Haller & T. Sapsis, Localized instability and attraction along invariant manifolds, SIAM Journal of Appl. Dynamical Systems, 9 (2010) 611-633. 34. T. Sapsis & G. Haller, Clustering Criterion for Inertial Particles in 2D Time-Periodic and 3D Steady Flows, Chaos, 20 (2010) 017515. 35. T. Sapsis & P. Lermusiaux, Dynamically orthogonal field equations for continuous stochastic dynamical systems, Physica D, 238 (2009) 2347-2360. 36. T. Sapsis, A. Vakakis, O. Gendelman, L. Bergman, G. Kerschen, & D. Quinn. Efficiency of targeted energy transfers in coupled nonlinear oscillators associated with 1:1 resonance captures: Part II, Analytical study, J. Sound Vib., 325 (2009) 297-320. 37. T. Sapsis & G. Haller, Inertial particle dynamics in a hurricane, J. Atmosph. Sci., 66 (2009) 2481-2492. 38. D. Quinn, O. Gendelman, G. Kerschen, T. Sapsis, L. Bergman, & A. Vakakis. Efficiency of Targeted Energy Transfers in Coupled Nonlinear Oscillators Associated with 1:1 Resonance Captures: Part I, J. Sound Vib., 311 (2008) 1228. 39. G. Haller & T. Sapsis, Where do inertial particles go in fluid flows? Physica D, 237 (2008) 573-583. 40. T. Sapsis & G. Haller, Instabilities in the dynamics of neutrally buoyant particles. Phys. Fluids, 20 (2008) 017102. 41. T. Sapsis & G. Athanassoulis, New partial differential equations governing the response-excitation joint probability distributions of nonlinear systems under general stochastic excitation, Probabilistic Engineering Mechanics, 23 (2008) 289.
Patents 1.
J.M. Kluger, T.P. Sapsis, A.H. Slocum, Beam-based nonlinear spring, (2015) Submitted.
Invited Seminars 1. 2. 3. 4.
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Technion Israel Institute of Technology – Mechanical Engineering. Quantification and prediction of rogue waves in the ocean. Host: Prof. O. Gendelman. Cargèse International School 2015: Rogue and shock waves in nonlinear dispersive media, July 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. M. Onorato. Naval Surface Warfare Center – Carderock Technical Seminar Series, July 2015. Extreme values of response of dynamical systems akin to ship motions. Host: Dr. V. Belenky. New Jersey Institute of Technology – Department of Mathematics. Workshop on Applied and Computational Mathematics, June 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. David Shirokoff. Swiss Federal Institute of Technology (ETH), June 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. P. Koumoutsakos & C. Schwab. Worcester Polytechnic Institute – Mathematics Colloquium, April, 2015, Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. M. Sarkis. University of Wisconsin-Madison – Department of Mathematics. Workshop on Uncertainty quantification in kinetic and hyperbolic problems, March 2015. Quantification and prediction of rogue waves in the ocean. Host: Prof. Shi Jin. University of Florida at Gainesville - Department of Mechanical and Aerospace Engineering, March, 2015, Quantification and prediction of nonlinear waves in the ocean. Host: Prof. K. Mohseni.
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City College of New York - Department of Mechanical Engineering, October, 2014. Quantification and prediction of rogue waves in the ocean. Host: Prof. Y. Andreopoulos. New York University - Courant Institute of Mathematical Sciences (CAOS), October, 2014. Quantification and prediction of rogue waves in the ocean. Host: Prof. S. Smith. Center for Environmental Sensing And Modeling, Singapore-MIT Alliance for Research and Technology Interdisciplinary Research Group Seminar Series, June, 2014. Analytical and computational methods for systems with intermittent and persistent instabilities: applications to the quantification of extreme events and efficient energy harvesting. Host: Prof. N. Patrikalakis. American Bureau of Shipping, April 10, 2014. Analytical and Computational Methods for Stochastic Systems with Intermittent or Persistent Instabilities in Naval Architecture and Ocean Engineering. Host: Dr. Richard Korpus. Pacific Northwest National Laboratory, Computational Sciences & Mathematics Division Seminar Series, March 24, 2014. Order-reduction and uncertainty quantification using dynamical orthogonality with applications on the stochastic modeling of chaotic fluid flows. Host: Prof. G. Karniadakis. MIT, Department of Aeronautics and Astronautics, ACDL Seminar, November 15, 2013. Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. Jaime Peraire. Brown University, Center for Fluid Mechanics, November 5, 2013. Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities. Host: Prof. Brad Marston. American Bureau of Shipping, June 20, 2013. Quantifying higher-order statistics and extreme events in wave models. Host: Mr. Todd Grove. American Bureau of Shipping, June 19, 2013. Stochastic systems in the ocean and marine environment. Host: Mr. Todd Grove. Institute for Mathematics and its Applications – University of Minnesota, Workshop on Stochastic Modeling of the Oceans and Atmospheres, March 13, 2013. A statistically accurate modified quasilinear Gaussian closure for uncertainty quantification in turbulent dynamical systems. Host: A. Majda National Technical University of Athens, Joint Seminar – Dept. of Naval Architecture and Marine Engineering and Dept. of Applied Mathematics, January 10, 2013. Uncertainty quantification (UQ) in laminar and turbulent systems using blended subspace closures. Host: Prof. G. Athanassoulis. US Naval Undersea Warfare Center, December 2012, Uncertainty quantification (UQ) in laminar and turbulent systems using blended subspace closures. Host: Dr. D. Steinbrecher. New York University, Workshop on Uncertainty Quantification and Inverse Problems, November 30, 2012, Blended Reduced Subspace Methods for Uncertainty Quantification of Unstable Stochastic Systems. Host: Prof. A. Majda. Institute for Computational and Experimental Research in Mathematics (ICERM), Providence October 2012, Workshop on Uncertainty Quantification. Blended Reduced Subspace Methods for Uncertainty Quantification of Unstable Stochastic Systems. Invitation by Organizing Committee. EGU General Assembly, Vienna 2012, Special Session: Contributions of young stars in the field of Nonlinear Processes in Geosciences. Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. Invitation by EGU Organizing Committee. Fudan University, Shanghai 2012, International Workshop on long time stochastic and statistical approximations for turbulent dynamical systems, May 24, 2012, Blended Reduced Subspace Algorithms for Uncertainty Quantification. Host: Prof. J. Cheng. Northwestern University, Department of Physics and Astronomy - Complex Systems seminar series, April 5, 2012, Dynamics of finite-size particles in general fluid flows with applications. Host: Prof. A. Motter. McGill University, Department of Mathematics Seminar Series, March 21, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid flows, Host: Prof. G. Haller. École Polytechnique Fédérale de Lausanne, Department of Mechanical Engineering, March 16, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid flows, Host: Prof. I. Botsis. Massachusetts Institute of Technology, Department of Mechanical Engineering, February 28, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid and mechanical systems, Host: Prof. M. Triantafyllou. Harvard University, School of Engineering and Applied Sciences, February 23, 2012. Interplay of dynamical instability, stochasticity, and nonlinear energy transfer in fluid and mechanical systems, Host: Prof. L. Mahadevan. Utrecht University, Department of Physics and Astronomy, Aug 4, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. H. Dijkstra. Foundations of Computational Mathematics (FoCM), Budapest 2011, Computational Dynamics Workshop, July 12, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. B. Garay.
32. University of Illinois at Urbana-Champaign, Aerospace Engineering Seminar, March 14, 2011, Dynamically orthogonal field equations for stochastic flows. Host: Prof. L. Bergman. 33. Princeton University, Mechanical & Aerospace Engineering, January 14, 2011, Dynamically orthogonal field equations for stochastic dynamical systems with applications. Host: Prof. C. Rowley. 34. Brown University, Division of Applied Mathematics, December 10, 2010, Dynamical systems subjected to general stochastic excitation: A new class of equations for the evolution of probability distributions based on the Hopf approach. Host: Prof. G. Karniadakis. 35. Brown University, Division of Applied Mathematics, July 6, 2010, Dynamically orthogonal field equations for stochastic flows. Host: Prof. G. Karniadakis. 36. University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, April 2, 2010, Finite size particles in 3D flows: Theory & Applications. Host: Prof. H. Dankowicz. 37. New York University, Courant Institute of Mathematical Sciences, November 13, 2009, Dynamics of inertial particles in fluid flows. Host: Dr. S. Keating. 38. University of Illinois at Urbana-Champaign, Joint Civil Engineering and Aerospace Engineering Seminar, October 6, 2009, Dynamically orthogonal field equations for continuous stochastic dynamical systems. Host: Prof. A. Masud. 39. Woods Hole Oceanographic Institution, Geophysical Fluid Dynamics Program, July 10, 2009, Dynamics of inertial particles in fluid flows. Host: Prof. O. Buhler. 40. Massachusetts Institute of Technology, Center for Ocean Engineering: Joint VFRL-Towtank Seminar Series, February 25, 2009, Inertial particles motion in arbitrary fluid flows. Host: A. Kalmikov. 41. University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, October 13, 2008, Where Do Inertial Particles Go in Fluid Flows?. Host: Prof. A. Vakakis. 42. Max Planck Institute, Dresden, Dynamics of Inertial Particles: From Ocean and Atmosphere to Planets, Germany, 2008, Instabilities on the dynamics of inertial particles: Applications. (Invitation by Organizers). 43. Mathematisches Forschungsinstitut Oberwolfach, Germany, Workshop on Applied Dynamics and Geometric Mechanics, Instabilities on the dynamics of inertial particles in hurricane Isabel. Invitation by organizer Prof. Jerry Marsden. 44. Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, February 13, 2006, New partial differential equations governing the response-excitation joint probability distributions for nonlinear systems under regular stochastic excitation. Host: Prof. K. Sobczyk.
Conference Proceeding Papers and Book Chapters 1. 2. 3.
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M. Mohamad, T. P. Sapsis, Analytical approximation of the heavy-tail structure for intermittently unstable complex modes, Proceedings of the Dynamic Data Driven environmental System Science Conference, Cambridge, Massachusetts, Springer, 2015. W. Cousins, T. P. Sapsis, Reduced order probabilistic prediction of rogue waves in 1D envelope equations, Proceedings of the Dynamic Data Driven environmental System Science Conference, Cambridge, Massachusetts, Springer, 2015. H. K. Joo, T. P. Sapsis, Performance barriers for single-degree-of-freedom energy harvesters under generic stochastic excitation, Proceedings of the ASME 2014 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, IDETC/CIE 2014, Invited for MSNDC11-1 Nonlinear Energy Transfers and Harvesting, Buffalo, New York, August, 2014. W. Cousins, T. P. Sapsis, Quantification and prediction of intermittent events in nonlinear dispersive waves, 8th European Nonlinear Dynamics Conference, Invited for MS-3 Computational Methods, Vienna, Austria, 2014. H. K. Joo, T. P. Sapsis, Performance measures for SDOF energy harvesters under stochastic excitation, 8th European Nonlinear Dynamics Conference, Invited for MS-15 Energy Transfer and Harvesting in Nonlinear Systems, Vienna, Austria, 2014. T. Sapsis, A. Vakakis, and L. Bergman, Targeted energy transfer between dynamical components due to essential nonlinearities, Proceedings of ICOSSAR 2013: 11th International Conference on Structural Safety and Reliability, New York, 2013. T. Sapsis, A. Vakakis, and L. Bergman, Effect of stochasticity on targeted energy transfer from a linear medium to a strongly nonlinear attachment, 7th EUROMECH Conference ENOC, Rome, Italy, 2011. T. Sapsis, and P. Lermusiaux, Dynamically orthogonal field equations for stochastic fluid flows, 7th EUROMECH Conference ENOC, Rome, Italy, 2011. T. Sapsis, and P. Lermusiaux, Dynamically orthogonal field equations for stochastic continuous media, Proceedings of USNCTAM 2010: 16th US National Congress Of Theoretical And Applied Mechanics, 2010.
10. T. Sapsis, A. Vakakis, and L. Bergman, Effect of stochasticity on targeted energy transfer from a linear medium to a strongly nonlinear attachment, Proceedings of USNCTAM 2010: 16th US National Congress Of Theoretical And Applied Mechanics, 2010.
11. T. Sapsis, S. Koloutsou-Vakakis, M. Rood, B. Kim, and M. Kemme, Fugitive Dust Dispersion Using LIDAR Measurements and a Stochastic Lagrangian Model, in Air & Waste Management Association's Annual Conference and Exhibition, Calgary, AB, 2010. 12. T. Sapsis, and G. Haller, Clustering of inertial particles in 3D steady flows, in ‘Chaotic Systems: Theory and Applications’, C. H. Skiadas and I. Dimotikalis (Editors), World Scientific, 2010. 13. T. Sapsis and A. Vakakis, Targeted energy transfer in general linear waveguides: A unified integrodifferential equation formulation with applications, Euromech Colloquium 503: Nonlinear Normal Modes, Dimension Reduction & Localization, Frascati, Italy, 2009. 14. T. Sapsis and A. Vakakis, Targeted energy transfer in general linear waveguides: A unified integrodifferential equation formulation with applications, SICON CF: Nonlinear Dynamics, Stability, Identification and Control, University of Rome ‘La Sapienza’, Italy. 2009. 15. T. Sapsis and G. Haller, Clustering of inertial particles in 3D steady flows, Proceedings of the 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. 16. T. Sapsis and P. Lermusiaux, Reduced order evolution equations for stochastic fluid flows, Proceedings of the 2nd Chaotic Modelling and Simulation Conference (Chaos), Chania, Greece, 2009. 17. T. Sapsis, A.F. Vakakis, O.V. Gendelman, L.A. Bergman, G. Kerschen, D.D. Quinn, Efficiency of Targeted Energy Transfers in Coupled Nonlinear Oscillators Associated with 1:1 Resonance Captures, Proceedings of the Society of Engineering Science, 45th Annual Technical Meeting, Urbana-Champaign, Illinois, 2008. 18. T. Sapsis, D. D. Quinn, O. Gendelman, A. Vakakis, L. Bergman, and G. Kerschen, Applying L. Manevitch’s Complexification – Averaging method to analyze conditions for optimal Targeted Energy Transfer in coupled oscillators with essential stiffness nonlinearity. Proceedings of the International Conference on Nonlinear Phenomena in Polymer Solids and Low-dimensional Systems, Moscow, Russia, 2008. 19. T. Sapsis, and G. Haller, Inertial particles motion in geophysical fluid flows. Proceedings of the Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersburg, Russia, 2008. 20. T. Sapsis, D. D. Quinn, O. Gendelman, A. Vakakis, L. Bergman, and G. Kerschen, Efficient Targeted Energy Transfer in nonlinear oscillators. Proceedings of the Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersburg, Russia, 2008. 21. T. Sapsis, and G. Athanassoulis, New partial differential equations governing the joint response-excitation, probability distributions of nonlinear systems, under general stochastic excitation, Part I, II. Proceedings of the 5th International Conference on Computational Stochastic Mechanics (CSM-5), Rhodes, Greece, 2006.
Invited Conference Talks without Proceedings § 9th AIMS Conference on Dynamical Systems, Differential Equations, and Applications, Orlando, FL, USA, July, 2012, Special Session SS27: Transport Barriers in Dynamical Systems, Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. § 9th AIMS Conference on Dynamical Systems, Differential Equations, and Applications, Orlando, FL, USA, July, 2012, Special Session SS20: Stochastic Statistical Modelling of Climate, Blended Reduced Subspace Algorithms for Uncertainty Quantification. § SIAM Conference on Uncertainty Quantification, Raleigh, NC, USA, April, 2012, Inertial manifold dimensionality & finite-time instabilities in 2D Navier-Stokes equations. § 11th International Conference on Applications of Statistics and Probability in Civil Engineering, ETH Zurich, Switzerland, 2011, Dynamically orthogonal field equations for stochastic fluid flows. § European Geophysical Union – General Assembly 2010, Vienna, Austria, 2010, Inertial Lagrangian coherent structures in general unsteady flows. § SICON CF: Nonlinear Dynamics, Stability, Identification and Control, University of Rome ‘La Sapienza’, Italy, 2009, Stochastic targeted energy transfer in coupled nonlinear oscillators. § Bifurcations and Instabilities in Fluid Dynamics, Third International Symposium, University of Nottingham, UK, 2009, Instabilities on the dynamics of neutrally buoyant particles. § XXXVII Summer School: APM’ 2009, Advanced Problem in Mechanics, St. Petersburg (Repino), Russia, 2009. Local instabilities along invariant manifolds with applications to mechanics, fluids and biology. § SIAM Conference on Applications of Dynamical Systems, Snowbird, Utah, 2009. Stability and Instability in the Dynamics of Inertial Particles. § Atmosphere-Ocean Science Days, Courant Institute of Mathematical Sciences, New York, 2009. Dynamically orthogonal fields equations for distributed stochastic dynamical systems. § Division of Fluid Dynamics Meeting, San Antonio, Texas, 2008, Dynamics of finite-size particles in fluid flows. § Dynamics of Inertial Particles: From Ocean and Atmosphere to Planets, Max Planck Institute, Dresden, Germany, 2008, Instabilities on the dynamics of inertial particles: Applications. § Applied Dynamics and Geometric Mechanics, Mathematisches Forschungsinstitut Oberwolfach, Germany, 2008 Instabilities on the dynamics of inertial particles in hurricane Isabel. § 2nd International Conference on Nonlinear Normal Modes and Localization in Vibrating Systems, Samos, Greece, 2006, Probabilistic Responses of Dynamical Systems under smooth stochastic excitation: A unified approach based on Hopf equations.
Teaching Fall 2015: MIT Undergraduate Course 2.003 Dynamics. Spring 2015: MIT Graduate Course 2.081 Plates and Shells. Fall 2014: MIT Course 2.701 Principles of Naval Architecture. Spring 2014: MIT Graduate Course 2.081 Plates and Shells. Fall 2013: MIT Course 2.701 Principles of Naval Architecture. Spring 2012: NYU-Courant Institute of Mathematical Sciences, Guest lecturer for the graduate course Filtering of turbulent dynamical systems. Fall 2011: NYU-Courant Institute of Mathematical Sciences, Guest lecturer for the graduate course Quantifying Uncertainty in Complex Systems. Fall 2010: Guest lecturer for the graduate course Advanced Nonlinear Dynamics and Chaos at MIT-Mechanical Eng. Fall 2009: Guest lecturer for the undergraduate course Nonlinear Dynamics at MIT Fall 2009: Teaching Assistant for the graduate course Numerical Fluid Mechanics at MIT-Mechanical Eng. Spring 2006: Teaching Assistant for the undergraduate course Marine Hydrodynamics at SNAME (NTUA) Spring 2005: Lecturer for the graduate course Stochastic Modeling of Physical Phenomena at the School of Applied Mathematics and Physics of NTUA. Fall 2003: Teaching Assistant for the undergraduate course Introduction to Computing at SNAME (NTUA)
Students Graduate (5): Han Kyul Joo (MSc ‘14); Jocelyn Kluger (MSc ‘14); Mustafa Mohamad (MSc ‘15); Zhong Yi Wan (MSc ‘16); Saviz Mowlavi (MSc ’15) Undergraduate (2): Katy Evans (BSc ‘14); Henry Merrow (BSc ‘17); Sara Falcone (BSc ‘15); Trevor Day (BSc ‘17) Postdocs (3): Will Cousins (2013-2015); Hessameddin Babaee (2013-2016); Mohammad Farazmand (2015-2017) Thesis Reader (4): Minseok Choi (Brown University, PhD ‘14); Patrick Blonigan (MIT, PhD ‘16); Heyrim Cho (Brown University, PhD ‘15); Alessio Spantini (MIT, PhD ‘17).
Professional Activities Editorial Board • Journal of Ocean and Wind Energy (2014 – Present) Journal Reviewer Proceedings of the Royal Society A; Journal of Nonlinear Science; Physica D; Journal of Computational Physics; Physics of Fluids; SIAM Journal on Scientific Computing; Journal of Physical Oceanography; Journal of Fluid Mechanics; International Journal of Bifurcation and Chaos; Chaos; Probabilistic Engineering Mechanics; Ocean Dynamics; Engineering Applications of Computational Fluid Dynamics; Archive of Applied Mechanics; Journal of Applied Mechanics; International Journal of Nonlinear Mechanics; Numerical Algorithms; Engineering Applications of Computational Fluid Mechanics; Physics of Plasmas; Communications in Nonlinear Science and Numerical Simulation. Professional Societies Membership • Society of Industrial and Applied Mathematics • American Society of Mechanical Engineers • American Physical Society • International Society of Offshore and Polar Engineers • Society of Naval Architects and Marine Engineers Organizer • Organizer and Member of the Technical Program Committee for ISOPE – 2015 Conference, Kona, Big Island, Hawaii. • Organizing Committee for the “13th International Probabilistic Workshop (IPW 2015)”, Liverpool, UK, 2015. • Session Chair in the technical session “Nonlinear Energy Transfers and Harvesting” in the ASME 2014 International Design & Engineering Technical Conference, Buffalo, New York, 2014. • Organizer of the mini-symposium “Computational Methods” for the 8th European Nonlinear Dynamics Conference, Vienna, Austria, 2014. • Organizer of the mini-symposium “Uncertainty quantification of turbulent systems in reduced-order subspaces” for the SIAM Uncertainty Quantification Conference, Savannah, Georgia, 2014.
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Organizer of the seminar series: “Stochastic Analysis and Nonlinear Dynamics” in Mechanical Engineering Department – MIT (2013 – Present).
Judge • Judge for The MIT Mechanical Engineering de Florez Award Competition (2014). • Panelist for NSF Fluid Dynamics (FD) program (2014). • Judge for the MIT Clean Energy Prize (2014). Last updated on November 5, 2015
