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What is the numerical example? Is that simulated? Both look like physical objects.

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Bottom is CFD animation, top is the real deal viewed through Schlieren optics.

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Fig 19 (i) The Back Pressure is reduced to be equal to the pressure of the gas at the exit of the expansion. In this case no shocks are formed as exit and surrounding pressure are equal.

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The problem is not just aerodynamic, but aero acoustic as well.