Tamer Zaki

Associate Professor

Research Interests

Transitional and turbulent shear flows: linear and non-linear instability waves, secondary instabilities, breakdown to turbulence, direct numerical simulations, transition modelling. Two-fluid shear flows: linear and non-linear instability methods, interface tracking, the interaction of vortical disturbances with interfaces, direct numerical simulations, laminar-to-turbulence transition. Turbulence: boundary layer turbulence, separation, drag reduction, and large-scale high-performance computing.

  • Ph.D. 2005, Stanford University
  • M.S. 2001, Stanford University
  • B.S. 1998, Pennsylvania State University
  • 2015 - 2017:  Visiting Professor, Mechanical Engineering, Imperial College London
  • 2013 - 2015:  Reader, Mechanical Engineering, Imperial College London
  • 2010 - 2012:  Senior Lecturer, Mechanical Engineering, Imperial College London
  • 2006 - 2010:  Lecturer, Mechanical Engineering, Imperial College London
Research Areas
  • Transitional and turbulent shear flows: linear and non-linear instability waves, secondary instabilities, breakdown to turbulence, direct numerical simulations, transition modelling. Two-fluid shear flows: linear and non-linear instability methods, interface tracking, the interaction of vortical disturbances with interfaces, direct numerical simulations, laminar-to-turbulence transition. Turbulence: boundary layer turbulence, separation, drag reduction, and large-scale high-performance computing.
  • 2017:  Japanese Society for the Promotion of Science
  • 2016:  Japanese Society for the Promotion of Science
  • 2016:  Office of Naval Research Young Investigator Award
  • 2013:  Department Nominee, Faculty of Engineering Teaching Excellence Award, Imperial College London
  • 2013:  Institute of Industrial Sciences Visiting Fellowship, University of Tokyo
  • 2013:  Japanese Society for the Promotion of Science
  • 2013:  President and Rector’s Award for Excellence in Teaching, Imperial College London
  • 2010:  Department Nominee, Faculty of Engineering Teaching Excellence Award, Imperial College London
  • 2005:  Directors' fellowship, Los Alamos National Laboratory
  • 2005:  Graduate Fellowship, Stanford University
  • 2000:  Abstract of Distinction Award, The American Gastroenterological Association
Journal Articles
  • Nicolaou, L., Zaki, T. (2016).  Characterization of aerosol Stokes number in $90o$ bends and idealized extrathoracic airways!!!.  Journal of Aerosol Science.  102.  105-127.
  • Cerizza, D., Sekiguchi, W., Tsukahara, T., Zaki, T., Hasegawa, Y. (2016).  Reconstruction of scalar source intensity based on sensor signal in turbulent channel flow.  Flow, Turbulence & Combustion!!!.  97(4).  1211–1233.
  • Trevelyan, D. J., Zaki, T. (2016).  Wavy Taylor vortices in molecular dynamics simulation of cylindrical Couette flow.  Physical Review E.  93(4).
  • Hack, M. J., Zaki, T. (2016).  Data-enabled prediction of streak breakdown in pressure-gradient boundary layers.  Journal of Fluid Mechanics.  801.  43-64.
  • Page, J., Zaki, T. (2016).  Viscoelastic shear flow over a wavy surface.  Journal of Fluid Mechanics.  801.  392-429.
  • Hwang, J., Lee, J., Sung, H. J., Zaki, T. (2016).  Inner–outer interactions of large-scale structures in turbulent channel flow.  Journal of Fluid Mechanics.  790.  128-157.
  • Saha, S., Page, J., Zaki, T. (2016).  Disturbance amplification in boundary layers over thin wall films.  Physics of Fluids.  28(2).  024108.
  • Smith, E. R., Heyes, D. M., Dini, D., Zaki, T. (2015).  A localized momentum constraint for non-equilibrium molecular dynamics simulations..  J. Chemical Physics.  142(074110).
  • Nicolaou, L., Zaki, T. (2015).  A robust direct-forcing immersed boundary method with enhanced stability for moving body problems in curvilinear coordinates.  Computers and Fluids.  119.  101-114.
  • Ray, P. K., Zaki, T. (2015).  Absolute/convective instability of planar viscoelastic jets.  Physics of Fluids.  27(014110).
  • Hack, M. P., Zaki, T. (2015).  Bypass Transition in Three-dimensional Time-dependent Boundary Layers.  Procedia IUTAM.  14.  274-281.
  • Page, J., Zaki, T. (2015).  Dynamics of spanwise vorticity perturbations in homogeneous viscoelastic shear flow.  J. Fluid Mechanics.  777.  327-363.
  • Lee, J., Jelly, T. O., Zaki, T. (2015).  Effect of Reynolds number on turbulent drag reduction by superhydrophobic surface textures.  Flow, Turbulence & Combustion.  95.  277 - 300.
  • Rocco, G., Zaki, T., Mao, X., Blackburn, H., Sherwin, S. J. (2015).  Floquet and transient growth stability analysis of a flow through a compressor passage.  Aerospace Science and Technology.  44.  116-124.
  • Hack, M. J., Zaki, T. (2015).  Modal and nonmodal stability of boundary layers forced by spanwise wall oscillations.  J. Fluid Mechanics.  778.  389-427.
  • Marxen, O., Kotapati, R. B., Mittal, R., Zaki, T. (2015).  Stability analysis of separated flows subject to control by zero-net mass flux jet.  Physics of Fluids.  27(024107).
  • Jung, S. Y., Zaki, T. (2015).  The effect of a low-viscosity near-wall film on bypass transition in boundary layers.  J. Fluid Mechanics.  772.  330 - 360.
  • Agarwal, A., Brandt, L., Zaki, T. (2015).  Transition to Turbulence in Viscoelastic Channel Flow.  Procedia IUTAM.  14.  519-526.
  • Hack, M. J., Zaki, T. (2015).  Modal and non-modal stability of boundary layers forced by spanwise wall oscillations.  Journal of Fluid Mechanics.  778.  389-427.
  • Page, J., Zaki, T. (2015).  The dynamics of spanwise vorticity perturbations in homogeneous viscoelastic shear flow.  Journal of Fluid Mechanics.  777.  327-363.
  • Agarwal, A., Brandt, L., Zaki, T. (2014).  Linear and nonlinear evolution of a localized disturbance in polymeric channel flow.  Journal of Fluid Mechanics.  760.  278-303.
  • Wissink, J. G., Zaki, T., Rodi, W., Durbin, P. A. (2014).  The Effect of wake Turbulence Intensity on Transition in a Compressor Cascade.  Flow, Turbulence and Combustion.  93(4).  555-576.
  • Ray, P. K., Zaki, T. (2014).  Absolute instability in viscoelastic mixing layers.  Physics of Fluids.  26(014103).
  • Cheung, L. C., Zaki, T. (2014).  An exact representation of the nonlinear triad interaction terms in spectral space.  Journal of Fluid Mechanics.  748.  175-188.
  • Wissink, J. G., Zaki, T., Rodi, W., Durbin, P. A. (2014).  DNS of transition in a compressor cascade: The influence of migrating wakes..  Flow, Turbulence & Combustion (submitted).
  • Agarwal, A., Brandt, L., Zaki, T. (2014).  Linear and non-linear evolution of a localized disturbance in polymeric channel flow.  J. Fluid Mechanics.  760.  278 – 303.
  • Page, J., Zaki, T. (2014).  Streak evolution in viscoelastic Couette flow.  Journal of Fluid Mechanics.  742.  520-551.
  • Hack, M. J., Zaki, T. (2014).  Streak instabilities in boundary layers beneath free-stream turbulence.  Journal of Fluid Mechanics.  741.  280-315.
  • Hack, M. J., Zaki, T. (2014).  The influence of harmonic wall motion on transitional boundary layers.  J. Fluid Mechanics.  760.  63 – 94.
  • Heyes, D. M., Smith, E. R., Dini, D., Zaki, T. (2014).  The method of planes pressure tensor for a spherical subvolume.  Journal of Chemical Physics.  140(054506).
  • Jelly, T. O., Jung, S. Y., Zaki, T. (2014).  Turbulence and skin-friction modification in channel flow with streamwise-aligned superhydrophobic surface textures.  Physics of Fluids.  26(095102).
  • Lee, J., Jung, S. Y., Sung, H. J., Zaki, T. (2014).  Turbulent thermal boundary layers with temperature-dependent viscosity.  International Journal of Heat and Fluid Flow.
  • Nolan, K. P., Zaki, T. (2013).  Conditional sampling of transitional boundary layers in pressure gradients.  Journal of Fluid Mechanics.  728.  306-339.
  • Nicolaou, L., Zaki, T. (2013).  Direct numerical simulations of flow in realistic mouth-throat geometries.  Journal of Aerosol Science.  57.  71-87.
  • Lee, J., Jung, S. Y., Sung, H. J., Zaki, T. (2013).  Effect of wall heating on turbulent boundary layers with temperature-dependent viscosity.  Journal of Fluid Mechanics.  726.  196-225.
  • Zaki, T. (2013).  From Streaks to Spots and on to Turbulence: Exploring the Dynamics of Boundary Layer Transition.  Flow Turbulence and Combustion.  91(3).  451-473.
  • Zhang, M., Lashgari, I., Zaki, T., Brandt, L. (2013).  Linear stability analysis of channel flow of viscoelastic Oldroyd-B and FENE-P fluids.  Journal of Fluid Mechanics.  737.  249-279.
  • Smith, E. R., Heyes, D. M., Dini, D., Zaki, T. (2012).  Control-volume representation of molecular dynamics.  Physical Review E.  85(5).
  • Rehill, B., Walsh, E. J., Brandt, L., Schlatter, P., Zaki, T., McEligot, D. M. (2012).  Identifying Turbulent Spots in Transitional Boundary Layers.  Journal of Turbomachinery-Transactions of the ASME.  135 (1)(011019).
  • Lardeau, S., Leschziner, M., Zaki, T. (2012).  Large Eddy Simulation of Transitional Separated Flow over a Flat Plate and a Compressor Blade.  Flow Turbulence and Combustion.  88.  19-44.
  • Heyes, D. M., Smith, E. R., Dini, D., Spikes, H. A., Zaki, T. (2012).  Pressure dependence of confined liquid behavior subjected to boundary-driven shear.  Journal of Chemical Physics.  136(134705).
  • Hack, M. J., Zaki, T. (2012).  The continuous spectrum of time-harmonic shear layers.  Physics of Fluids.  24(034101).
  • Cheung, L. C., Zaki, T. (2011).  A nonlinear PSE method for two-fluid shear flows with complex interfacial topology.  Journal of Computational Physics.  230(17).  6756-6777.
  • Jones, B. L., Kerrigan, E. C., Morrison, J. F., Zaki, T. (2011).  Flow estimation of boundary layers using DNS-based wall shear information.  International Journal of Control.  84(8).  1310-1325.
  • Naraigh, L. O., Spelt, P. D., Matar, O. K., Zaki, T. (2011).  Interfacial instability in turbulent flow over a liquid film in a channel.  International Journal of Multiphase Flow.  37(7).  812-830.
  • Schrader, L., Brandt, L., Zaki, T. (2011).  Receptivity, instability and breakdown of Gortler flow.  Journal of Fluid Mechanics.  682.  362-396.
  • Vaughan, N. J., Zaki, T. (2011).  Stability of zero-pressure-gradient boundary layer distorted by unsteady Klebanoff streaks.  Journal of Fluid Mechanics.  681.  116-153.
  • Heyes, D. M., Smith, E. R., Dini, D., Zaki, T. (2011).  The equivalence between volume averaging and method of planes definitions of the pressure tensor at a plane.  Journal of Chemical Physics.  135(024512).
  • Naraigh, L. O., Spelt, P. D., Zaki, T. (2011).  Turbulent flow over a liquid layer revisited: multi-equation turbulence modelling.  Journal of Fluid Mechanics.  683.  357-394.
  • Zaki, T., Wissink, J. G., Rodi, W., Durbin, P. A. (2010).  Direct numerical simulations of transition in a compressor cascade: the influence of free-stream turbulence.  Journal of Fluid Mechanics.  665.  57-98.
  • Cheung, L. C., Zaki, T. (2010).  Linear and nonlinear instability waves in spatially developing two-phase mixing layers.  Physics of Fluids.  22(052103).  1-21.
  • Naguib, A. M., Morrison, J. F., Zaki, T. (2010).  On the relationship between the wall-shear-stress and transient-growth disturbances in a laminar boundary layer.  Physics of Fluids.  22(054103).
  • Zaki, T., Wissink, J. G., Durbin, P. A., Rodi, W. (2009).  Direct Computations of Boundary Layers Distorted by Migrating Wakes in a Linear Compressor Cascade.  Flow Turbulence and Combustion.  83(3).  307-322.
  • Durbin, P. A., Zaki, T., Liu, Y. (2009).  Interaction of discrete and continuous boundary layer modes to cause transition.  International Journal of Heat and Fluid Flow.  30(3).  403-410.
  • Zaki, T., Saha, S. (2009).  On shear sheltering and the structure of vortical modes in single- and two-fluid boundary layers.  Journal of Fluid Mechanics.  626.  111-147.
  • Liu, Y., Zaki, T., Durbin, P. A. (2008).  Boundary-layer transition by interaction of discrete and continuous modes.  Journal of Fluid Mechanics.  604.  199-233.
  • Liu, Y., Zaki, T., Durbin, P. A. (2008).  Floquet analysis of secondary instability of boundary layers distorted by Klebanoff streaks and Tollmien-Schlichting waves.  Physics of Fluids.  20(124102).
  • Zaki, T., Durbin, P. A. (2006).  Continuous mode transition and the effects of pressure gradient.  Journal of Fluid Mechanics.  563.  357-388.
  • Zaki, T., Durbin, P. A. (2005).  Mode interaction and the bypass route to transition.  Journal of Fluid Mechanics.  531.  85-111.
  • Ghosh, S. K., Kahrilas, P. J., Zaki, T., Pandolfino, J. E., Joehl, R. J., Brasseur, J. G. (2005).  The mechanical basis of impaired esophageal emptying postfundoplication.  American Journal of Physiology-Gastrointestinal and Liver Physiology.  289(1).  G21-G35.
  • Zaki, T., Kahrilas, P. J., Ghosh, S. K., Tatum, R. P., Joehl, R. J., Brasseur, J. G. (2000).  Mechanical consequences of tightness and length of wrap in fundoplication.  Gastroenterology.  118(4, Part 1).  A478-A479.
Book Chapters
  • Zaki, T., Page, J. (2016).  Theory and simulations of bypass transition in two-fluid boundary layers.  Theme Issue on Transition Modelling.  ERCOFTAC.  (106).
  • Zaki, T., Durbin, P. A., Wissink, J., Rodi, W. (2009).  DNS of Transition to Turbulence in a Linear Compressor Cascade.  431-440.
  • Durbin, P. A., Zaki, T. (2005).  Continuous Mode Transition.  Transition And Turbulence Control.  87-106.
Other Publications
  • Zaki, T. (2014).  Wall-based Actuation for Transition Delay and Drag Reduction.  DTIC Document.
  • Nolan, K. P., Zaki, T. (2012).  Conditional sampling and statistical analysis of transitional flows.  Center for Turbulence Research.  25-34.
  • Zaki, T. (2011).  On the Evolution of Vortical Disturbances in Two-Fluid Boundary Layers.  DTIC Document.
  • Zaki, T., Kyriazis, D. (2010).  Bypass Transition in Turbomachinery Flows: Turbulent Spots and the Calming Effect.  DTIC Document.
  • Zaki, T., Durbin, P. A., Wu, X. (2006).  Separation and transition to turbulence in a compressor passage.  Center for Turbulence Research, Stanford University.  19-33.
  • Zaki, T., Moulton, D., Nadiga, B., Taylor, M. (2005).  Multigrid Preconditioning in Fully-Implicit Evolution of the Ocean.  Los Alamos Report.
  • Ricco, P., Durbin, P. A., Zaki, T., Wu, X. (2004).  Nonlinear evolution of velocity fluctuations in a laminar boundary layer excited by free-stream vortical disturbances.  The Center of Turbulence Research.  223 - 240.
Conference Proceedings
  • Lee, J., Zaki, T.  Video: A computational laboratory for the study of transitional and turbulent boundary layers.  68th Annual Meeting of the APS Division of Fluid Dynamics - Gallery of Fluid Motion.  American Physical Society (APS).
  • Cerizza, D., Zaki, T., Hasegawa, Y. (2016).  Effects of velocity and measurement uncertainties on estimation of scalar source intensity in turbulent channel flow.  First Pacific Rim Thermal Engineering Conference.
  • Biancofiore, L., Brandt, L., Zaki, T. (2016).  Streak instability in viscoelastic Couette flow.  11th Euopean Fluid Mechanics Conference.
  • Mao, X., Zaki, T., Sherwin, S. J., Blackburn, H. (2016).  Bypass transition induced by free-stream noise in flow past a blade cascade.  16th International Symposium of Transport Phenomena and Dynamics of Rotating Machinery.
  • Hwang, J., Lee, J., Sung, H. J., Zaki, T. (2015).  Evolution of large-scale motions in wall-bounded turbulence.  Proceedings of the ASME-JSME-KSME Joint Fluids Engineering Conference.
  • Hwang, J., Lee, J., Sung, H. J., Zaki, T. (2015).  Near-wall features of very large-scale motions in a turbulent channel flow.  9th International Symposium on Turbulence Shear Flow Phenomena - TSFP9.
  • Nicolaou, L., Zaki, T. (2015).  On the Stokes number and characterization of aerosol deposition in the respiratory airways.  4th International Conference on Computational & Mathematical Biomedical Engineering.
  • Agarwal, A., Brandt, L., Zaki, T. (2014).  Bypass breakdown to turbulence in viscoelastic channel flow.
  • Hack, M. J., Zaki, T. (2014).  Localized Instabilities of Boundary Layer Streaks in Zero and Adverse Pressure Gradients.  7th AIAA Theoretical Fluid Fluid Mechanics Conference.
  • Hack, M. J., Zaki, T. (2014).  Nonmodal and modal growth in boundary layers subject to wall oscillation.
  • Jelly, T. O., Jung, S. Y., Zaki, T. (2014).  On the drag-reducing capacity of superhydrophobic surfaces.  10th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Hack, P., Zaki, T. (2014).  Localized Streak Instabilities in Pressure Gradient Boundary Layers.  7th AIAA Theoretical Fluid Mechanics Conference.  American Institute of Aeronautics and Astronautics (AIAA).
  • Nicolaou, L., Zaki, T. (2013).  An immersed boundary method for patient-specific modelling of flow and aerosol deposition in the respiratory airways.  3rd International Conference on Computational & Mathematical Biomedical Engineering.
  • Lee, J., Jung, S. Y., Sung, H. J., Zaki, T. (2013).  Structure of turbulent boundary layer with viscosity stratification.  8th International Symposium on Turbulence Shear Flow Phenomena - TSFP8.
  • Zhang, Y., Zaki, T., Sherwin, S. J., Wu, X. (2012).  Nonlinear response of a laminar boundary layer to isotropic and spanwise localized free-stream turbulence.  6th AIAA Theoretical Fluid Mechanics Conference.
  • Nicolaou, L., Zaki, T. (2012).  Prediction of flow and aerosol deposition in the extrathoracic airways using an implicit immersed boundary method.  9th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Jones, B. L., Kerrigan, E., Morrison, J., Zaki, T. (2011).  Flow Estimation of Boundary Layers Using Wall-Shear information.  18th IFAC World Congress of the International Federation of Automatic Control.  18 PART 1.  13813-13818.
  • Kerrigan, E. C., Morrison, J. F., Zaki, T. (2011).  Flow Estimation of Boundary Layers Using Wall-Shear Measurements.  18th World Congress of the International Federation of Automatic Control.
  • Zaki, T., Liu, Y., Durbin, P. A. (2010).  Boundary layer transition by interaction of streaks and Tollmien-Schlichting waves.  18.  439-444.
  • Rehill, B., Walsh, E. J., Brandt, L., Schlatter, P., Zaki, T. (2010).  Identifying turbulent spots in a transitional boundary layer.  ASME TurboExpo.
  • Lardeau, S., Zaki, T. (2010).  Large-eddy simulation of transitional flow in a compressor cascade.  8th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Vaughan, N. J., Zaki, T. (2010).  The effect of unsteady streaks on boundary layer stability.  8th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Cheung, L. C., Zaki, T. (2010).  Development of spatial instability waves in laminar two-phase mixing layers.  7th International Conference on Multiphase Flow.
  • Saha, S., Jung, S. Y., Zaki, T. (2010).  Stabilization of wall shear beneath vortical disturbances using a thin film.  7th International Conference on Multiphase Flow.
  • Heyes, D. M., Zaki, T., Dini, D. (2009).  Non-equilibrium Molecular Dynamics Simulations of Shear Characteristics in Dry and Lubricated Contacts.  World Tribology Congress.
  • Lardeau, S., Zaki, T. (2009).  Assessment of Large-Eddy Simulation for accurate prediction of transitional flow in a compressor cascade.  15th International Conference on Finite Elements in Flow Problems.
  • Naraigh, L. O., Matar, O. K., Spelt, P. D., Zaki, T. (2008).  Interfacial stability in turbulent pressure-driven channel flow.  AIChE100 Annual Meeting, Conference Proceedings.
  • Durbin, P. A., Liu, Y., Zaki, T. (2008).  Boundary layer transition by discrete and continuous modes.  7th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Wissink, J. G., Zaki, T., Durbin, P. A., Rodi, W. (2008).  Direct Numerical Simulations of Flow in a Low-Pressure Compressor Cascade with Incoming Wakes (Invited).  8th World Congress on Computational Mechanics.
  • Zaki, T., Wissink, J. G., Durbin, P. A., Rodi, W. (2008).  DNS of wake-boundary layer interactions in a linear compressor.  7th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements.
  • Durbin, P. A., Zaki, T. (2007).  Simulation of transition on a compressor blade.  9th US National Congress on Computational Mechanics.
  • Zaki, T., Durbin, P. A., Wissink, J. G., Rodi, W. (2006).  DNS of transition in a linear compressor cascade.  Minnowbrook V: Workshop on Unsteady Flows in Turbomachinery (NASA/CP—2006-214484).
  • Zaki, T., Durbin, P. A., Wissink, J. G., Rodi, W. (2006).  Direct numerical simulation of by-pass and separation-induced transition in a linear compressor cascade.  ASME TurboExpo.  1421-1429.
  • Durbin, P. A., Medic, G., Zaki, T. (2003).  Bypass Transition Via Continuous Modes and Unsteady Effects on Film Cooling.  Minnowbrook IV: Workshop on Transition and Unsteady Aspects of Turbomachinery Flows (NASA/TM—2004-212913).
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