What happens when the cross – flow velocity becomes supersonic?

What happens when the cross – flow velocity becomes supersonic? Correct Answer Embedded shock waves on the leeward side

When the cross – flow velocity (Vθ, Vϕ) increases and Vθ2 + Vϕ2 becomes greater than the square of free – stream velocity i.e. the cross – flow velocity becomes supersonic, then there is formation of embedded shock waves on the leeward portion of the cone.
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