Turbulence statistics and coherent structures in compressible channel flow

Abstract

Direct numerical simulations of compressible turbulent channel flows are performed for bulk Mach numbers M${}_{b}$ = 0.8 and 1.5 and bulk Reynolds numbers Re${}_{b}$ up to 34000. It is shown that the incompressible and compressible flows become similar at high Re${}_{b}$. Most of the compressibility effects can be considered using semilocal scaling. Although the streamwise Reynolds stress peak continuously increases with M${}_{b}$, the change with M${}_{b}$ decreases at higher Re${}_{b}$.

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