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The surface integral can be used to represent ____ and ____ terms of the transport equation.

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The surface integral can be used to represent ____ and ____ terms of the transport equation.

(a) Rate of change and diffusion

(b) Rate of change and convection

(c) Source and diffusion

(d) Convection and diffusion

I have been asked this question in final exam.

This is a very interesting question from General Transport Equation topic in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct choice is (d) Convection and diffusion

Best explanation: Convection and diffusion terms are based on a transfer through the boundaries. The boundaries of a volume are its surfaces which makes surface integrals ideal for convection and diffusion.

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