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Which is the first step in the numerical solution of a fluid flow problem?

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Which is the first step in the numerical solution of a fluid flow problem?

(a) Discretization

(b) Physical model of the flow

(c) Mathematical model of the flow

(d) Iteration

This question was addressed to me in homework.

This interesting question is from Numerical Methods topic in chapter Numerical Methods of Computational Fluid Dynamics

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Correct answer is (c) Mathematical model of the flow

Explanation: The first step of any numerical solution of a fluid problem is converting the physical flow into a mathematical model. Physical model of the flow is what we have to solve. After generating the mathematical model only steps like discretization and iterative solution follows.

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