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What is the problem in solving flows with Mach numbers around and above 1?

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in Computational Fluid Dynamics by (118k points)
What is the problem in solving flows with Mach numbers around and above 1?

(a) Mach number

(b) Compressibility

(c) Continuity

(d) Pressure

This question was addressed to me during an internship interview.

My question is based upon Mathematical Behaviour of PDE topic in chapter Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

1 Answer

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The correct choice is (b) Compressibility

To elaborate: Flows with Mach numbers around and above 1 has the additional issue of compressibility. Air becomes compressible at higher speeds and the effects of compressibility also should be included while solving the problem.

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