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What is the disadvantage in predicting a complex problem with a very limited objective in CFD?

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What is the disadvantage in predicting a complex problem with a very limited objective in CFD?

(a) Time-consuming

(b) Impossible to solve

(c) Slower

(d) Expensive

The question was asked in a national level competition.

The question is from CFD Advantages and Disadvantages in division Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

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Best answer
Correct choice is (d) Expensive

The best explanation: For difficult problems with complex geometry, strong non-linearity, etc., if the objective is very limited, then use of CFD will become costlier than experimenting. For such cases, experimental results are suitable.

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