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An extra term in the energy equation of the compressible flows is ___________

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An extra term in the energy equation of the compressible flows is ___________

(a) convection term

(b) viscous dissipation term

(c) diffusion term

(d) unsteady term

I got this question in a national level competition.

My question comes from Compressible Flows in section Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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The correct answer is (b) viscous dissipation term

Explanation: The viscous dissipation term is an additional term in the energy conservation equation of the compressible flows like the bulk viscosity term of the momentum equation. The discretization procedure is the same as that of the bulk viscosity term.

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