Turbulent Supersonic Channel Flow: Direct Numerical Simulation and Modeling

摘要

In this paper, direct numerical simulation results of turbulent supersonic channel flow are analyzed to address several questions that are relevant to turbulence modeling: the turbulence frequency production mechanism, wall damping effects on turbulence model parameters, and the relevance of compressibility effects. Limited support is found for usually applied models for the turbulence frequency production and wall damping effects. In contrast to that it is shown that turbulence frequency production mechanisms and wall damping effects may be explained very well on the basis of a frequency scaling that characterizes mean flow changes. The influence of compressibility is found to be relevant.