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What does the term \(\frac{\partial(\rho\Phi)}{\partial t}\) mean?

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in Computational Fluid Dynamics by (118k points)
What does the term \(\frac{\partial(\rho\Phi)}{\partial t}\) mean?

(a) Rate of change

(b) Convection

(c) Diffusion

(d) Source term

I had been asked this question in an international level competition.

Question is from General Transport Equation topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct choice is (a) Rate of change

Easy explanation: This term represents the rate of change of fluid property inside the model of flow. It does not involve any kind of flow of the property.

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