29 octobre 2020

Seminar Alexander Smits

Dr. Alexander Smits is Eugene Higgins Professor of Mechanical and Aerospace Engineering at the Princeton University. He is Member of the National Academy of Engineering, Fellow of the American Physical Society (APS), the American Institute for Aeronautics and Astronautics (AIAA), the American Society of Mechanical Engineers (ASME), the Australasian Fluid Mechanics Society, and the American Association for the Advancement of Science. Dr. Smits’s research interests are centered on fundamental, experimental research in turbulence and fluid mechanics. Particular aspects include Reynolds numbers scaling of turbulent flows, the effects of roughness; bio-inspired propulsion; drag reduction using liquid-infused porous surfaces; the behavior of turbulent flows at supersonic and hypersonic speeds; sports ball aerodynamics, and the development of new and improved measurement techniques. He is the co-author (with J.P. Dussauge) of “Turbulent Shear Layers in Compressible Flow,” Springer-Verlag, 1996 (2nd edition, 2005), author of “A Physical Introduction to Fluid Mechanics,” John Wiley & Sons, 2000, and co-editor (with T.T. Lim) of “Flow Visualization: Techniques and Examples,” Imperial College Press, 2000 (2nd edition, 2011), as well as the author or co-author of more than 400 journal articles and papers in conference proceedings. He holds patents on testing the aerodynamics of golf balls, and on using femtosecond lasers in eye surgery and tattoo removal. Dr. Smits received the Aerodynamic Measurement Technology Award from AIAA in 2014, and an Honorary Doctorate of Engineering from University of Melbourne in Australia, in 2011. In 2009, he received the Médaille de la Ville de Marseille. In 2007, he received the Fluids Engineering Award from the ASME, and the Pendray Aerospace Literature Award from the AIAA, as well as the President's Award for Distinguished Teaching from Princeton University. In 2004, Dr. Smits received the Fluid Dynamics Award of the AIAA. He was the Chair of the Division of Fluid Dynamics of the American Physical Society in 2007-2008. He is currently Editor-in-Chief of the AIAA Journal, an Associate Editor of the Journal of Turbulence, and he is on the Editorial Board of the Journal of Experimental and Thermal Fluid Science He is a past Associate Editor of the Journal of Fluid Mechanics and Physics of Fluids. From 1995 to 1999, he served as Editor-in-Chief for the Journal of Experimental and Thermal Fluid Science, and he is a Chief Editor, http://www.efluids.com, a specialty web portal for students and researchers in fluid dynamics.
Canonical and non-equilibrium turbulent flows

Abstract : To attain a very large range of Reynolds numbers in the laboratory, it is convenient to use high-pressure air.  We have made extensive use of this approach to study the behavior of fully-developed pipe flow, turbulent boundary layers, and the wakes downstream of bodies-of-revolution.  Based on this work, as well as recent DNS, I discuss some of the questions that persist for the scaling of pipe and boundary layer flows at high Reynolds number, including the scaling of the mean velocity profile, streamwise turbulence intensity, spectra, coherent motions and superstructures.  I will also discuss how turbulence responds to non-equilibrium effects such as changes in roughness, especially the slow return to equilibrium.

Presentation Prof. Smits

29 octobre 2020, 16h3017h30
Bâtiment M6, Cité Scientifique, Villeneuve d'Ascq, France