Numerical study of cylindrical blast-wave propagation and reflection

The problem of an unsteady cylindrical blast-wave interaction with a hat pl ate is numerically investigated. The numerical simulation aims at the under standing of blast-wave propagation, reflection, and its transition phenomen on as well as the how features induced by the blast wave, A fifth-order wei ghted essentially nonoscillatory scheme for spatial discretization associat ed with a fourth-order Runge-Kutta method for time integration is employed for solving the two-dimensional Euler/Navier-Stokes equations in a finite v olume fashion. To verify the accuracy of the numerical solver developed, se veral problems were tested. The computed results for the test problems are shown to be accurate in comparison with experimental data. To study the flo wfield of a blast wave, the problem of blast-wave propagation in a free fie ld is explored first. Two types of initial conditions are considered. A con tact-surface instability that developed around a contact surface was found in the problem with the first kind of initial condition. Next, the problem of the blast-wave interaction with the hot plate is investigated. The how s tructure of a shock-shock interaction induced by the unsteady blast wave an d ifs evolution are studied in detail, It was found that the lon er the hei ght of burst or the higher the shock Mach number, the earlier the occurrenc e of the transition from a regular reflection to a Mach reflection and the higher the triple points.