Turbulence statistics and coherent structures in compressible channel flow

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