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

Sandberg, R.D. and Fasel, H.F. (2004) High-accuracy DNS of supersonic base flows and control of the near wake. In Proceedings of Users Group Conference 2004. IEEE. pp. 80-88 . (doi:10.1109/DOD_UGC.2004.22).

Record type: Conference or Workshop Item (Paper)

Abstract

Large-scale numerical simulations of axisymmetric, supersonicbase flows were conducted at various Reynolds numbers. Direct Numerical Simulations (DNS) were employed to investigate the hydrodynamic stability behaviorof the near-wake region. As a consequence of physical flow instabilities, large coherent structures evolve that have a significant impact on the mean flow 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 base-pressure and thus decreasing the drag of a blunt body at supersonic speed. For these investigations, a high-order accurate compressible Navier-Stokes solver in cylindrical coordinates with high parallel efficiency was developed and employed on the SGI Origin3900 shared memory complex at the ERDC MSRC. In addition to providing vital insight into the physical mechanisms in supersonic base flows, the DNS results are intended for use as benchmark data for the development of a Flow Simulation Methodology (FSM) for high Reynolds number turbulent flows

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