抄録
Direct numerical simulation (DNS) of compressible turbulent channel flow with uniform blowing (UB) or uniform suction (US) is performed aiming at skin friction drag reduction. The Mach numbers, based on the bulk velocity and sound speed at the walls, of 1.5 and 3 are considered. The Reynolds numbers, based on the bulk velocity and channel half-width, is 3000. The DNS results show that skin friction drag is reduced on the blowing side, while increased on the suction side. The local skin friction coefficient c_f using the complessible flow version of the FIK identity reveals that the main contributors to drag modification are the Reynolds shear stress and mean wall-normal convection, similarly to the case of incompressible flow.
