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September 11, 2013, 21:42 |
"Counter-gradient" term in interFoam.
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#1 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 838
Rep Power: 17 |
Hi guys,
Some articles depict the interFoam in detail, but I still have many confusions. In weller's paper: he said: Quote:
but in another paper. it said: All in all, how can we ensure these two U_c are the same? |
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September 12, 2013, 01:51 |
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#2 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21 |
The first one is the one that is implemented in OpenFOAM, as you can easily confirm from alphaEqn.H.
The second one does not have a meaning from a simulation point of view, as there is only one U in the simulations. You don't keep track of both liquid and gas velocity, as you would do in twoPhaseEulerFoam. However, if you would use indicator functions for that set of equation, you will eventually find U_c=U_l-U_g. Also, be aware that this is not a counter-gradient term, but more of a convective like term, with the same purpose in the end. |
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