Turbulence Model Validation for Complex Mixing Scenarios

Bertrand Rollin, CCS-2; Nicholas A. Denissen, Jon M. Reisner, Malcolm J. Andrews, XCP-4; Jimmy Fung, XCP-1 Computing requirements for simulating complex multi-physics flows are such that Reynolds averaged Navier-Stokes (RANS) models will remain the community’s chosen workhorse for years to come. Within applications of interest to LANL, such as compressible mixing, the Besnard Harlow Rauenzahn (BHR) RANS models are being utilized within Advanced Simulation and Computing (ASC) codes. Specifically, the present work examines the ability of the BHR-2 turbulence model to simulate Rayleigh-Taylor mixing and bulk interface motions of two fluids driven by gravity within a tilted rig experiment. We present here the results from simulations using the BHR-2 model and compare them to available experimental and Implicit Large Eddy Simulation (ILES) results. These comparisons are intended to demonstrate the utility of the BHR-2 model to accurately predict various aspects of compressible turbulent mixing.