Large-Eddy Simulation of Helium and Argon Supersonic Jets in Supersonic Air Co-flow

The experiments of A. D. Cutler et al. (NASA Langley Research Center) were modeled in which a cold supersonic round jet (of helium or argon) issued into a co-flow air stream. These tests provide high accuracy measurements of Pitot pressure and helium/argon mass fraction. Presented computations were carried out with the use of in-house code zFlare developed in TsAGI. Two sets of multiblock hexahedral grids were constructed, one for RANS computations and the other for LES. Due to the presence of near-wall domains, the approach adopted for large-eddy simulation was actually hybrid SST-DDES model. Steady RANS computations were conducted with q - omega turbulence model. Time-averaged fields of Pitot pressure and mass fraction were extracted and compared with the experimental data.