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Something wrong in UEqns.H within twoPhaseEulerFoam |
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March 15, 2011, 13:35 |
Something wrong in UEqns.H within twoPhaseEulerFoam
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#1 | |
Member
Charlie
Join Date: Dec 2010
Location: USA
Posts: 85
Rep Power: 16 |
I'm right now trying to understand how twoPhaseEulerFoam works, and get what they are erally solving. However, There seems something odd in the code.
Following is the source code for Ua and Ub in twoPhaseEulerFoam: Quote:
Or does openfoam has assigned use Ua to calculate dispersed phase and Ub for continuous phase? for example I define b as dispersed phase, then openfoam will solve Ua for b? Also, note that only in Ueqn for a we can find the kinetic theory option. Is that true? What's the momentum equation to guide this code? I'm relatively new to twoPhaseEulerFoam. Any help will be highly appreciated! |
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June 24, 2011, 10:30 |
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#2 |
New Member
Ulisses
Join Date: Mar 2009
Location: Brazil
Posts: 24
Rep Power: 17 |
Hi Charlie,
I am using kinetic theory in twoPhaseEulerFoam but my solution diverges. Maybe it could be because of that you showed up. Have you achieved a conclusion about that? Thanks |
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June 24, 2011, 11:48 |
Try to reduce the timestep
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#3 |
Member
Charlie
Join Date: Dec 2010
Location: USA
Posts: 85
Rep Power: 16 |
Hi,
There are two options to simulate the particle phase turbulence (In the code). If we turn on the kinetic theory, then use kinetic theory to calculate the effective viscosity of particle phase. If we turn the kinetic theory off, then we use turbulent response coefficient Ct to model the turbulent viscosity of particle phase. As far as I'm concerned, the alphaEqn is more of significance leading to numerical divergence, since the alphaEqn in twoPhaseEulerFoam is nonlinear and also need to be bounded on both ends. try to refer to PhD thesis of Henrik Rusche, 2002. About the phase selection, I just confirm to the convention, that is, use default setting, a as disperse phase, b as continuous phase. Any question are welcomed. Charlie |
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