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What does this diagram represent?

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in Computational Fluid Dynamics by (118k points)
What does this diagram represent?

(a) Finite control volume moving along with the flow

(b) Stationary finite control volume

(c) Infinitesimally small element with the fluid passing through it

(d) Infinitesimally small element moving along with the flow

I got this question during an interview.

The origin of the question is Governing Equations topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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Best answer
The correct answer is (b) Stationary finite control volume

The explanation is: The diagram represents a finite control volume stationary in position. Fluid flows into and out of this model.

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