High-accuracy DNS of supersonic base flows and control of the near wake

Abstract

Large-scale numerical simulations of axisymmetric, supersonic base flows were conducted at various Reynolds numbers. Direct Numerical Simulations (DNS) were employed to investigate the hydrodynamic stability behavior of the near-wake region. As a consequence of physical flow instabilities, large coherent structures evolve that have a significant impact on the mean flow wand and are responsible for a considerable amount of base-drag. It is demonstrated that the deliberate exclusion or reinforcement of certain helical modes can lead to a rise in bas -pressure and thus decrease the drag of a blunt body at supersonic speed. For these investigations, a high-order accurate compressible Navier-Stok..