Investigation of Fully-Coupled Conjugate Heat Transfer and Shock-Wave/Boundary-Layer Interactions using LES

Abstract

Fully coupled conjugate heat transfer (CHT) is combined with a wall resolved large eddy simulation (WR-LES) of a shockwave boundary layer interaction (SBLI). The effects of the higher fidelity CHT boundary condition on the SBLI flow physics and turbulence statistical metrics are investigated while also developing the foundation to precisely deal with the time scale disparity problem of CHT and LES. Two thermal conditions (a heated and cooled wall), and two materials (a realistic copper material and a material designed to enforce more equitable thermal response between the fluid and solid), are simulated for a total of four cases. Results reveal how the combination of mean velocity, temperature, and pressure; and the RMS temperature, skin friction coefficient, semi-local Reynolds numbers, wall heat flux, Reynolds stresses, and integral length scales, vary as a function of the wall thermal characteristics and material properties. A cooled wall displays stronger levels of turbulence, increased coherence, a smaller separation bubble length, and smaller skin friction coefficient. Thermal fluctuations in the solid domain dominantly follow the near wall slow moving fluid thermal structures, regardless of solid wall thermal properties.