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For which of these flows is methods of characteristics limited to?

(a) Inviscid flow

(b) Viscous flow

(c) One – dimensional flow

(d) Quasi – two – dimensional flow

This question was addressed to me in a job interview.

My question is from Philosophy of Method of Characteristics topic in chapter Numerical Techniques for Steady Supersonic Flow of Aerodynamics

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The correct choice is (a) Inviscid flow

For explanation I would say: For computing supersonic steady inviscid flows, there are two major numerical techniques that are used. The first being the methods of characteristics which is an older technique limited to inviscid flows. The other method is the finite – difference method which is applicable for both viscous and inviscid flows.

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