Schémas de capture de choc et interférence des ondes de choc

Abstract

When an oblique shock wave strikes a flat wall, two types of reflections are possible. Next, the relative inclination shocks relative to the direction of the upstream flow is obtained, a regular reflection (RR), a Mach reflection (MR). At Mach numbers higher than 2.2, there is a range of angles of incidence for which the two types of reflections are possible in conjunction. This is the area of dual solutions, which led to the hypothesis of the existence of a hysteresis effect in the transition RR-MR. The purpose of this work is to find numerically the hysteresis observed in experimental studies in the interference of shock waves, especially regular interactions and Mach. This addresses the problem of dealing with a numerical study designed on the principle of shock capturing scheme. The calculation is done using a CFD-FASTRAN code based on the resolution of the Navier-Stokes equations by the finite volume method. The variety of numerical methods used allowed to study four separate hysteresis phenomena. The first was observed by varying the Mach number, the incident angle of the dihedral being fixed. The second, also on a constant Mach, by varying the angle of incidence shock generators dihedral (asymmetric case), the third was studied the influence of variation of relaxing on Reports (NPR). Finally the wave interaction phenomenon of shock / boundary layer, and development of the recirculation zone of the turbulent boundary layer.