Large Eddy Simulations of Temporal Mixing Layers Under Supercritical Thermodynamic Conditions: O_2/H_2

A Direct Numerical Simulation (DNS) database of supercritical temporal mixing layer simulations of binary mixtures is studied to identify the Large Eddy Simulation (LES) subgrid scale model needs for high pressure flows. For the oxygen/hydrogen (OH) mixture studied here, an earlier a priori study showed that in addition to the usual subgrid scale flux terms, a new term in the filtered energy equation must be modeled. A model formulation was proposed for this term called heat flux correction (q-correction), but the model was only partially successful in the a priori tests. In this study, the earlier a priori analysis is revisited to investigate the reasons for the limited success of the previously proposed model for the q-correction. In addition, a new modeling strategy is proposed and examined a priori. Finally, an a posteriori study is conducted to test the viability of the newly proposed model