High-Speed Turbulence with Shocks over Non-Adiabatic and Flexible Walls

PI Johan Larsson, University of Maryland
Larsson 2020 INCITE

Different aspects of shock-turbulence interactions. Background: shock-induced mixing (blue to red) shadowed by the velocity marking the shock as the sharp gradient. Foreground: oblique shock impinging on a turbulent boundary layer over a flexible panel, showing the streamwise velocity (vertical slice), the wall shear stress (blue to red on the wall), and the deflection of the surface. Image: Ivan Bermejo-Moreno, University of Southern California

This project investigates how supersonic wall-bounded turbulent flows are affected by the thermal wall boundary condition and how they interact with flexible walls. High-fidelity simulations at different Mach numbers, Reynolds numbers, and imposed wall temperatures will be used to create a database that advances the theoretical description of how the mean velocity profile scales with these factors. As current theories fail at high Mach numbers for either strongly cooled walls or nearly adiabatic walls, the results of this work will be used to develop a predictive model that remains accurate across all flow conditions. This, in turn, will lead to improved modeling techniques for near-wall turbulence and improved semi- empirical friction.

This project will also consider the interaction between supersonic turbulent boundary layers and shockwaves in the presence of rigid and flexible walls, and will create highly resolved reference data for two such cases (axisymmetric and planar interactions). These data will be used to assess and validate modeling techniques for near-wall turbulence in the context of large eddy simulations.