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position of body force on the momentum equation |
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September 23, 2014, 05:48 |
position of body force on the momentum equation
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#1 |
Senior Member
Hua Zen
Join Date: Mar 2009
Posts: 138
Rep Power: 17 |
Hi, I have a question on the position of the body force on the momentum equation. I have search the forum and find two different strategy:
1. It should be included in the Ueqn: fvVectorMatrix UEqn ( fvm::ddt(U) + fvm::div(phi, U) - fvm::laplacian(nu, U) == F ); 2: It should be included in the predictor step: solve(UEqn ==F -fvc::grad(p)); Can any expert explain to me which one is correct? |
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September 26, 2014, 15:00 |
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#2 |
Senior Member
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18 |
You can do whatever you want as far as the PISO loop is consistent.
I mean, with the first option, you don't have to change anything in the algorithm (F is part of H). For the second option, you have to modify the recontruction of the velocity from the pressure gradient to include F. Both options leads to the same results. Best, Cyp |
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September 26, 2014, 22:31 |
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#3 |
Senior Member
Hua Zen
Join Date: Mar 2009
Posts: 138
Rep Power: 17 |
Thanks Cyp for your help.
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