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Old   December 1, 2010, 09:50
Question interFoam Ueqn
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the LHS of UEqn is as follows,
fvVectorMatrix UEqn
fvm::ddt(rho, U)
+ fvm::div(rhoPhi, U)
- fvm::laplacian(muEff, U)
- (fvc::grad(U) & fvc::grad(muEff))

I want to know the physical meaning of the last term,
(fvc::grad(U) & fvc::grad(muEff)) and wher it come form,
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Old   December 1, 2010, 17:44
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Hi Alvin, this term is due spatial variation of muEff. From the Cauchy equation you have for the viscous term div & [muEff*grad(U)], since muEff is not a constant, using the chain rule: muEff*laplacian(U)+grad(muEff)&U.

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Old   December 2, 2010, 02:28
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Thanks,very helpful
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