Abstract
The paper presents direct numerical simulations of the propagation of a strong planar shock wave along a two-layer interface confined between two walls. Transient stage and steady state of the propagation are described. In the steady state regime, a stationary irregular refraction of the shock and a vorticity sheet are characterized. Physics of the stationary irregular refraction state is explained. Shock velocity is studied. Quantities are shown to verify a set of generalized Rankine–Hugoniot relations. The unknown coupling mechanism between shear layer and pressure step is predicted by a neural network which leads to a predictive, gray-box type model.
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