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problem in setting the domain to empty

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Old   April 13, 2011, 21:54
Default problem in setting the domain to empty
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Princes Okwu
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hello formers,

I'm trying simulations involving a solid-liquid two-phase flow in a pipe, which has to be initially empty. I realised that setting alpha to zero in setFieldsDict will automatically fill the domain with the comtinuous phase.

My question is how can i adjust the intries in setFieldsDict to set the domain initially without both the continuous and the dispersed phase (that is empty)?

Any help will be highly welcomed.
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Old   April 14, 2011, 09:00
Default Just a guess
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Fabian Roesler
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Hi Prince

It's just a guess but I would say you have to use a multiphase VOF solver. In the multiphase VOF solver, one phase has to be air for example. So alpha is 0 for the continuous phase, 1 for the solid and 2 for the gaseous air phase. Donít know how to handle the solid though. Have a look at the multiphaseInterFoam solver.

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Fabian
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Old   May 6, 2011, 05:52
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Hi Fabian,

Thanks for the idea but i think the multiphase VOF solvers are not suitable for problems involving dispersed particles. I am using bubbleFoam or twoPhaseEulerFoam but have got no idea how to set the domain to empty since it is only suitable for two-phase flow.

Your suggestion could be a better idea if i can recode the twoPhaseEulerFoam to handle multipase problems, which i have no idea on how to go about it.

Would be nice if any one could be of help.

Prinse.
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Old   May 6, 2011, 06:16
Default interLagrangianFoam
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Fabian Roesler
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Hi Prince

now I understand your case better than before. So you have three different phases. Liquid continuous phase, solid particle and initial empty pipe or air. The solvers you mentioned are for two liquid/gaseous phases. Have a look at the http://openfoamwiki.net/index.php/Sig_Multiphase page. There you should find some real particle solvers like the icoLagrangianFoam. What you have to do now is to build a solver from interFoam with two phases and icoLagrangianFoam. A dambreak case as test would be nice. Sorry for not helping you out with an existing solver. I know none. But don't hesitate to continue the thread. Itís an interesting topic.

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Fabian
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Old   May 6, 2011, 06:25
Default LES + VOF + particle tracking
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Fabian Roesler
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Hi Prince

searching the net I found an interesting thread and a contrib to the solidParticleFoam solver. Have a look:

LES + VOF + Particle tracking

http://openfoamwiki.net/index.php/Co...idParticleFoam

The first link discusses a large eddy simulation with volume of fluid method for two phase flow with particles dispersed in one of the two phases. This is what you need. Would be nice if you could let me know if this still works with the new OF versions and how you proceed.

Best wishes

Fabian
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Old   May 6, 2011, 13:39
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Fabian,
That has been wonderful of you. So much thanks for your info. I am working on similar case. will give it a trial too

Best regards

benjy
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