Kweon Y., Miyazato Y., Aoki T., Kim H., Setoguchi T.

This paper describes computational works investigating the flow fields of a shock wave discharging from an exit of a duct and impinging on a plate plane. A second order total variation diminishing (TVD) scheme is employed to solve three-dimensional, unsteady, compressible Euler equations. In the present computation, two different configurations of duct exits (i.e., square and + shape) are tested, and the distance of a duct exit-to-flat plane is changed to obtain the pressure fluctuations generated on the plate due to shock impingement. The Mach number of an incident shock wave is varied between 1.05 and 2.0 ranging from weak shocks to strong shocks. The present computational analysis clearly reveals the detailed shock wave reflections/diffractions and vortical flows generated between the duct exit and the flat plane. Based upon the results obtained, the effects of a duct exit geometry, a duct exit-to-flat plane spacing and an incident shock strength on the flow characteristics of shock wave are discussed in detail. The problem of shock impingement on the obstacle in the vicinity of the duct exits with different shapes has practical importance. Thus, it is believed that the present computational work can provide useful and practical data for controlling the shock wave action in variety of industrial application.