Influence of the shock wave intensity on instability development at rough interfaces of a three-layer gas system

The influence exerted by the intensity of a shock wave transmitted through rough interfaces on instability development in a three-layer gas system at Mach numbers $\mathrm{M}$ = 1.3 and $\mathrm{M}$ = 3 is studied. The three-layer system is obtained by placing two thin films (interfaces) across a shock tube. A heavy gas (sulfur hexafluoride) occupies the space between the interfaces (the central layer of the system), while the spaces to the left and right of the central layer are filled with air. The initial roughness of the interfaces is specified as a two-mode sinusoidal perturbation. The computations are carried out using the MIMOZA code based on implicit large eddy simulation (ILES) with the Euler equations integrated on a mesh with square cells. The numerical results are compared with each other and, at $\mathrm{M}$ = 1.3, with experimental data.