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Which of these terms need a volume integral while modelling steady flows?

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Which of these terms need a volume integral while modelling steady flows?

(a) Convection term

(b) Diffusion term

(c) Source term

(d) Rate of change term

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Asked question is from Finite Volume Method topic in division Finite Volume Methods of Computational Fluid Dynamics

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Best answer
The correct option is (c) Source term

The best explanation: The convection and diffusion terms need surface integrals and not volume integrals. The source and rate of change terms need volume integral. Since the flow taken is a steady flow, the rate of change term will be equal to zero. So, in this case, only the source term needs a volume integral.

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