Numerical simulation of a compressible vortex–wall interaction

Abstract

The wall interaction of isolated compressible vortices generated from a short driver section shock tube has been simulated numerically by solving the Navier–Stokes equations in axisymmetric form. The dynamics of shock-free (incident shock Mach number M= 1.36) and shock-embedded (M= 1.57) compressible vortices near the wall has been studied in detail. The AUSM+ scheme with a fifth-order upwind interpolation formula is used for the convective fluxes. Time integration is performed using a low dissipative and dispersive fourth-order six-stage Runge–Kutta scheme. The evolution of primary and wall vortices has been shown using the velocity field, vorticity field, and numerical schlierens. The vortex impingement, shocklets, wall vortices, and their lift-off are clearly identified from the wall pressure time history. It has been observed that the maximum vorticity of the wall vortices reaches close to 30 % of the primary vortex for M= 1.36 and it reaches up to 60 % for M= 1.57. The net pressure force on the wall due to incident shock impingement is dominant compared to the compressible vortex impingement and their evolution. © 2016, Springer-Verlag Berlin Heidelberg.