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Old   October 31, 2000, 22:50
Default VOF and turbulence
  #1
Eugenio Mayol
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Hi

I would like to hear from anyone who has had success in modelling a free surfaces using VOF (multiphase fluids) and at the same time be able to use a turbulence model. I have been able to get some good results by doing this. Has anybody else attempted this with any success.

thanks in advance eugenio
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Old   November 24, 2000, 15:04
Default Re: VOF and turbulence
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Pat Neuman
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CFX 4 has free surface and VOF capability. Your local AEA office should have some good examples of this technology.
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Old   December 4, 2000, 09:22
Default Re: VOF and turbulence
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stuart Orme
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Hi, I was wondering if you could briefly explain something to me ? What is the difference (if any) between the CFX multi phase model and a volume of fluid method solver ? I have come across many papers that talk about VOF methods but never gone into any detail. Best regards Stuart
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Old   December 7, 2000, 14:18
Default Re: VOF and turbulence
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Pat Neuman
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Multi-phase modeling models a transition from gas to liquid phase and cannot handle the sudden density change at a gas-fluid interface of differnt materials. That is where VOF is used.
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Old   December 8, 2000, 09:54
Default Re: VOF and turbulence
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Stuart Orme
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Hi Pat, cheers for the reply. So is my understanding correct that CFX 4.3 already uses the VOF method for its multi phase modelling ? Also do you have any experience in the modelling of sloshing type problems ?
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Old   December 8, 2000, 10:44
Default Re: VOF and turbulence
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Pat
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CFX 4 has free surface modelling for sloshing and spilling flows, but not a true VOF model. VOF is under development for CFX 5.

I have not used CFX 4 for free surface modelling.
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Old   December 11, 2000, 03:07
Default Re: VOF and turbulence
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Eugenio Mayol
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Stuart Hi I have managed to model sloshing type problems using VOF in cfx.

The multiphase method it uses treats the two phases as a homogeneuous material (ie same equations for pressure , etc). It solves a different VOF equation for each phase although

cheers

eugenio
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Old   January 14, 2001, 18:14
Default Re: VOF and turbulence
  #8
Vololololo
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A bit late but I have seen a couple papers and thesis's using VOF with turbulence models(Not with CFX). Check out a paper by Peric (2000), also a PhD student from Karlsuhe I think his name was Sabisch,W (2000). Anyway, Its not uncommon now...
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Old   January 14, 2001, 19:18
Default Re: VOF and turbulence
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Eugenio Mayol
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Vololololo

thanks for the tip would you please be able to provide me with more details to the paper by Peric and the Phd

thanks in advance

eugenio
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Old   January 17, 2001, 15:46
Default Re: VOF and turbulence
  #10
Vololololo
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Forschungszentrum Karlsruhe Wissenschaftliche Berichte FZKA 6478

Dreidimensionale numerische Simulation der Dynamik von aufsteigen Einzelblasen und Blasenschwaermen mit einer Volume-of-Fluid-Methode.

(Hope you like german)
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Old   February 13, 2001, 01:39
Default Re: VOF and turbulence
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Onno
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For VOF on arbitrary meshes see: Ubbink, O. and Issa, R.I., 1999, A method of capturing sharp fluid interfaces on arbitrary meshes. J. Comput. Phys., Vol. 153, p. 26-50.
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