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There is a supersonic flow over a flat plate (assume inviscid--no boundary layer). Suddenly, there is a point blast occurring on the flat plate, generating a semi-spherical shock wave. For the horizontal shock component that is in the direction of the flow, it is just a normal shock-jump relation between the unshocked and shocked flow. But what about the horizontal shock component that is opposite to the direction of the flow? Assume the blast wave itself always has an initial shock front speed higher than the flow. enter image description here

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