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Problem about fvMatrix in OpenFOAM, over volume or not

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Old   September 26, 2012, 19:45
Default Problem about fvMatrix in OpenFOAM, over volume or not
Haomin Yuan
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Dear All foamers:

I have a question about the equations in OpenFOAM. When we set those equations, like UEqn and PEqn, is every term over by cell volume or not? Like in UEqn, the fvm::div term is value integral the cell volume, but the grad(p) term is divided by cell volume. That really confused me,

Can anybody give me a clear explanation about this issue? Or where can I find the answer about this??

thank you all in advance.
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Old   July 6, 2015, 21:11
Arrow Problem about fvMatrix in OpenFOAM, over volume or not
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for the source term in UEqn should follow similar expression of other ddt or div terms , for example fvm::ddt(rho, U) terms already includes mesh.V() as (see in src finiteVolume code for schemes)

fvm.source() = rDeltaT*mesh().V()*
- coefft00*vf.oldTime().oldTime().internalField()

for updating any source terms following fvm.source() function just update the function that does not need to divide by V. See the example in OpenFoam >src lagrangian> intermediate> KinematicCloudI.H for SU(U) source term.
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