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Which among these is used to specify a particular problem which we consider for solving in CFD?

(a) Boundary conditions

(b) Governing equations

(c) Governing laws

(d) Solution method

This question was addressed to me during an interview.

My enquiry is from Boundary Conditions in division Boundary Conditions of Computational Fluid Dynamics

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The correct option is (a) Boundary conditions

To explain I would say: Boundary conditions can define a particular problem. When the same governing equations are used to solve different problems, boundary conditions are the one which makes the problem unique.

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