Nov 2022
Zoom link: https://kaust.zoom.us/j/93470060850
ID: 93470060850
Shock waves are a fundamental aspect in any high-speed aerospace applications. They are characterized by a nearly discontinuous jump in kinetic and thermodynamic properties of the flow, yet, from a gas dynamics perspective, laminar shocks do have a finite width due to the mass and thermal diffusion properties of the fluid. Turbulence passing through a shock causes large-scale undulations of the shock surface, thus from a time-averaged perspective, the average shock position is much wider than the physical thickness (laminar) of the shock. The understanding of shock waves and its interaction with turbulence, referred to as shock wave - turbulence interaction or STI, is of critical importance to the predictive modeling efforts in applied aerospace applications. After an introductory overview of the topic, this talk will discuss the challenges faced by conventional modeling approaches of STI. These challenges motivate our work to define a physics-based model to characterize the relevant length and timescales of this problem. We develop a semi-empirical model to characterize the time-averaged thickness of a shock imbedded within a turbulent, vortical flow and propose that the average shock thickness can provide a characteristic scale of the interaction which can be used to predict the turbulent kinetic energy jump through the shock. These simple models, based on the underlying physics of STI,
Are being used to improve the predictive modeling in high-speed aerospace applications.
Jean-Pierre Hickey is an Assistant Professor in Mechanical and Mechatronics Engineering at the University of Waterloo in Ontario, Canada. He is drawn to the study of complex, multi-physics fluid problems in aerospace involving the strong coupling between thermodynamics, acoustics, chemical kinetics, and, invariably, turbulence. These tightly coupled problems are studied in the context of aerospace and aeronautical applications, his research has been funded by industrial collaborations. Prior to joining Waterloo in 2016, Jean-Pierre was a Research Scientist at the German Aerospace Center (DLR) in Goettingen (2014-15) and a Postdoctoral Fellow at the Center for Turbulence Research, Stanford University (2013-14). He received his Ph.D. from the Royal Military College of Canada (2013), his M.Sc. from the Darmstadt University of Technology (2007) and his bachelor from Polytechnique Montreal (2005).