NUMERICAL STUDY OF SHOCK-WAVE REFLECTIONS FROM A WEDGE WITH SURFACE-ROUGHNESS

Numerical simulations of shock-wave reflections from a wedge with surf ace roughness are performed using a two-dimensional finite-volume gene ralized-Riemann-problem (GRP) scheme. The surface roughness is simulat ed by two-dimensional square cavities (gutters), which are formed on a wedge surface with regular intervals. The numerical results are compa red with shadowgraphs obtained from shock-tube experiments, with excel lent agreement, The formation and propagation of a secondary reflected shock wave, which plays a key role in the shock-wave reflection from a multi-guttered wedge, are revealed and discussed in the present nume rical study.