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Where is the solve of UEqn in twoPhaseEulerFoam?

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Old   July 5, 2012, 09:51
Default Where is the solve of UEqn in twoPhaseEulerFoam?
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Qingang Xiong
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Hi Foamers,
In the manual "Derivation, Modelling and Solution of the Conditionally Averaged Two-Phase Flow Equations" by Weller et al. they said that momentum equations are constructed and solved. But in the solver code of twoPhaseEulerFoam, I just see UaEqn.relax(), not solve(). So could anyone explain to me how about this issue? Thank you!
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Old   July 8, 2012, 10:51
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I think the momentum equation is not predicted and is only corrected in pressure loop which is conservative. (see pEqn.H)
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Old   July 9, 2012, 02:13
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Alberto Passalacqua
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The momentum equation is defined (excluding some terms, which are transferred to the pressure equation), and the velocity is predicted with a single Jacobi step.

You could predict the velocity with a direct solution, including the transferred term by means of the reconstruct operator, however this might slow convergence down.
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GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats.
OpenQBMM - An open-source implementation of quadrature-based moment methods.

To obtain more accurate answers, please specify the version of OpenFOAM you are using.
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