Abstract
A strategy for scale-resolving simulations of bi-species turbulent flows is presented. It relies on a combination of Zonal Detached Eddy Simulation (ZDES) and an original low-dissipative version of the AUSM scheme that adapts its dissipation to capture flow discontinuities while ensuring a low numerical dissipation level in resolved turbulence regions. The corresponding discretized equations are thoroughly detailed. This comprehensive numerical framework is evaluated for the coaxial Air/Argon jet configuration investigated experimentally by Clifton and Cutler [1]. A robust method based on a combination of white noise to generate velocity fluctuations at the inlet of attached turbulent boundary layers together with a dynamic forcing method is applied for the first time in a curvilinear bi-species flow framework with ZDES mode 3. It is shown that the taking into account of resolved turbulence in the incoming attached boundary layers provided by this approach improves the prediction of the mixing process in the early stages of the mixing layer. A good agreement with experiment is also observed with a RANS description of attached boundary layers as permitted by ZDES mode 2 (2020) [2] where the switch between RANS and LES zones is set dynamically by the model itself.
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