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Which of these flows can be represented by the following diagram?

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Which of these flows can be represented by the following diagram?

(a) Unsteady viscous supersonic flow

(b) Unsteady inviscid supersonic flow

(c) Steady inviscid supersonic flow

(d) Steady inviscid subsonic flow

I have been asked this question during an online interview.

My question is from Mathematical Behaviour of PDE in chapter Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

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The correct option is (b) Unsteady inviscid supersonic flow

Explanation: From the diagram, as the solutions are time marching, the flow must be unsteady. Unsteady viscous flow is parabolic. But the diagram is for hyperbolic problems. So, unsteady inviscid supersonic flow suits this diagram.

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