Abstract
Recent DNS (Direct Numerical Simulation) results indicate that the main compressibility effect in turbulence comes from the reduced pressure-strain term due to reduced pressure fluctuations. In our previous work, using the concept of moving equilibrium in compressible homogeneous shear flow, we developed a compressible pressure-strain model by modifying an incompressible linear pressure-strain model. The model is characterized by a decrease in the primary redistribution term but an increase in the secondary redistribution term. However, this model is not suitable for wall-bounded compressible flows since the compressible parameter is expressed as a function of turbulent Mach number only. It is well known that compressible effects vanish or become weak in compressible boundary layers, but the turbulent Mach number alone is not sufficient to mimick this nature. It is also widely known that the existing compressibility correction models deteriorate the prediction performance of the incompressible turbulence models in the calculation of supersonic wall-bounded flows.
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