Abstract
When a shock wave is discharged from the exit of a duct, complicated unsteady flow field is formed near the exit of a duct. The flow is much more complicated under the ground effects or any other objects near the exit of a duct, such as the circumstance near the exit of the high-speed railway tunnel. The resulting flow is essentially three-dimensional unsteady with the effects of strong compressibility. In the present study, three-dimensional flow fields of the shock wave that is discharged from the exit of a duct are numerically investigated using a CFD method. Computations are carried out in the range below the Mach number of incident shock wave 1.5. The results obtained clearly show that the directivity and magnitude of the impulse wave discharged from the exit of a duct strongly depend upon the Mach number of incident shock wave and are significantly influenced by the effects of ground and wall.
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