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For a control volume moving along with the flow, which of these properties is a constant?

(a) Volume

(b) Shape

(c) Mass

(d) Velocity

I got this question at a job interview.

The doubt is from Governing Equations in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct option is (c) Mass

To explain I would say: Mass of a control volume moving along with the flow will not vary. It is constant with time. The volume, shape and velocity of the control volume may not be the same at all points of time.

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