Direct numerical simulations of supersonic turbulent channel flows of dense gases

Abstract eng:
In this work we investigate the influence of dense gas effects on compressible wall-bounded turbulence. Direct numerical simulations of supersonic turbulent channel flows are performed both for air and PP11, a heavy fluorocarbon representative of dense gases. Using different thermodynamic models, a parametric study on the bulk Mach and Reynolds numbers is carried out. In the dense-gas flow, friction heating effects are reduced due to the much smaller coupling between thermal and kinetic fields. The location of peak values for the premultiplied spectra of thermodynamic variables changes and the characteristic size of the observed turbulent structures is closer to that observed in incompressible turbulence.

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