Numerical investigation of turbulent supersonic axisymmetric wakes

Abstract

Numerical experiments are conducted of turbulent supersonic axisymmetric wakes at Mach number M= 2. 46 and Reynolds number, based on free-stream velocity and base diameter, ReD = 1× 105. Direct numerical simulations (DNS) are used to study the effect of approach flow conditions, and of specific azimuthal modes, on the near-wake behaviour. To that end, DNS are performed with laminar and turbulent approach boundary layers, and additional turbulent approach flow DNS with reduced circumferential size are conducted to deliberately eliminate certain azimuthal/helical modes. DNS with turbulent approach flow show an increased turning angle and increased growth of the separating shear layer, leading ..