Abstract: The first part of this talk will discuss the application of a flow-structure interaction high-fidelity simulation capability to study a Mach 3 oblique-shock/turbulent-boundary-layer interaction (STLI) over rigid and elastic panels. The incoming turbulent boundary layer thickness before the interaction is 4 mm and the oblique shock deflection angle is increased from zero to 17.5 deg in about 15 ms, producing mean flow separation and subsequent low-frequency flow dynamics. The simulations complement prior experiments by Daub et al. (2016) at the German Aerospace Center (DLR). The simulation methodology incorporates a wall-modeled large-eddy simulation finite-volume flow solver, an isoparametric finite-element solid mechanics solver, and a mesh deformation solver based on a spring-system analogy. Three-dimensional effects of the coupled interaction are assessed by comparing full-span and reduced spanwise-periodic simulation results. A characterization of the effects of panel elasticity follows by comparing the wall pressure and friction profiles, and separation bubble dynamics for rigid- and flexible-wall simulation cases. The second part of the talk will introduce a novel tracking methodology for the analysis of the dynamics of flow features in turbulent flows. Applications to the shock-driven turbulent mixing enhancement and the breakup of a liquid droplet in a background turbulent flow will be highlighted.
Bio: Ivan Bermejo-Moreno received his Ph.D. in aeronautics (2008) from the California Institute of Technology. Afterwards, he held a postdoctoral research fellowship at the Center for Turbulence Research, Stanford University/NASA Ames Research Center (2009-2014). He joined the Aerospace and Mechanical Engineering Department at the University of Southern California as assistant professor in 2015. His research combines numerical methods, physical modeling, and high-performance computing for the simulation and analysis of turbulent fluid flows involving multi-physics phenomena.
Ramesh Balakrishnan