Direct numerical simulation of bypass transition under free-stream turbulence for compressible flows

Abstract

Direct numerical simulations (DNS) of bypass transition of a flat-plate boundary-layer subject to free-stream turbulence (FST) were performed. A synthetic turbulent inflow is generated by superposition of modes of the continuous spectrum resulting from linear stability theory (LST). The present article briefly explains the adaption of the method for a fully compressible framework, including the generation of turbulence as well as the treatment of the inflow boundary conditions. The results of a flat-plate flow at three different integral turbulent length scales were compared and validated with results from the literature. In addition, a performance analysis of the codes and methods used was performed on the HLRS Hawk supercomputer.