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This paper describes computational work to understand the unsteady flow-field of a shock wave discharging froman exit of a duct and impinging upon a flat plate.A flat plate is located downstream, and normal to the axis of theduct.The distance between the exit of the duct and fiat plate is changed.In the present study,two different ductgeometries(i.e.,square and cross section)are simulated to investigate the effect of duct geometry on theun-steady flows of a shock wave.In computation,the total variation diminishing(TVD)scheme is employed tosolve three-dimensional,unsteady,compressible,Euler equations.Computations are performed over the range ofshock Mach number from 1.05 to 1.75.Computational results can predict the three-dimensional dynamic behav-iour of the shock wave impinging upon the flat plate.The results obtained show that the pressure increase gener-ated on the plate by the shock impingement depends on the duct geometry and the distance between the duct exitand plate,as well as the shock Mach number.It is also found that for the duct with cross-section,the unsteadyloads acting on the flat plate are less,compared with the square duct.
This paper describes computational work to understand the unsteady flow-field of a shock wave discharging froman exit of a duct and impinging upon a flat plate. A flat plate is located downstream, and normal to the axis of theduct. Distance distance the exit of the duct and fiat plate is changed.In the present study, two different duct geometries (ie, square and cross section) are simulated to investigate the effect of duct geometry on theun- steady flows of a shock wave. computation, the total variation diminishing (TVD) scheme is employed tosolve three-dimensional, unsteady, compressible, Euler equations. Computations are performed over the range of hash Mach number from 1.05 to 1.75. Combinational results can predict the three-dimensional dynamic behav-ior of the shock wave impinging upon the flat plate. The results obtained show that the pressure increase gener-ated on the plate by the shock impingement depends on the duct geometry and the distance between the duct exit and plate, as well as the shock Mach number. It is also found that for the duct with cross-section, the unsteady load acting on the flat plate are less, compared with the square duct.