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Old   May 29, 2003, 12:23
Default VOF status
  #1
Paul
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Hi,

Can anyone point to me the latest advancements in VOF method (I followed VOF up to PLIC-VOF method)?

Are there any free VOF code available, 2D, axi-symmetric, or 3D? Thanks!
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Old   May 29, 2003, 14:14
Default Re: VOF status
  #2
Dr. Hrvoje Jasak
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Take a look at my post in ALE a few subject below - it gives some examples in FOAM and the web site with more data...

Hrv
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Old   May 30, 2003, 11:05
Default Re: VOF status
  #3
Alfa Wang
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I recently started working with the VOF model. The old program is for single-phase, two-dimensional cases, using SIMPLEC algorithm, which means iterations are needed. I wrote the SLIC and Donor-Acceptor schemes (PLIC-VOF is on the way). I checked these these schemes with unidimensional velocities, and they work quite well. Then I couple this with the old program for continuty and momentum equations. Of course, the VOF equation is solved using the written schemes. I set two fluids as one (with same properties), and the programs work well with the test case, duct flows. However, they did not work properly for the real two-phase flows, e.g., the dam broken test case. No converged results can be obtained.

Anybody can give any advice? Your help is extremely appreciated.
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Old   May 30, 2003, 22:32
Default Re: VOF status
  #4
Paul
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Hi,

Has PLIC-VOF been applied to non-uniform curvilinear mesh? So far, I saw Zaleski applied PLIC-VOF to uniform rectangular grid.
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Old   May 31, 2003, 04:10
Default Re: VOF status
  #5
Dr. Hrvoje Jasak
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Well, in a manner of speaking. The FOAM implementation is based on the work by Onno Ubbink et al, which uses compressive differenncing (it has evolved since the original work) and does not actually reconstruct the interface and its direction in every cell. The best references in open literature I can quote are:

Ubbink, O., 1997, `Numerical prediction of two fluid systems with sharp interfaces'. Phd Thesis, University of London.

Ubbink, O, and Issa, RI, "A method for capturing sharp fluid interfaces on arbitrary meshes," JOURNAL OF COMPUTATIONAL PHYSICS, vol. 153, pp. 26-50, 1999. (abstract)

and some stuff in

Computational Fluid Dynamics of Dispersed Two-Phase Flows at High Phase Fractions H. Rusche PhD Thesis, Imperial College, London (2003)

http://monet.me.ic.ac.uk/people/henrus/phdWork/

and a new one for me (found on the web):

https://pronet.wsatkins.co.uk/marnet.../pdf/peric.pdf

This methodology allows you to implement a VOF-like methodology on any unstructured polyhedral mesh; we have done tets, hexes (+ degenerates) and polyhedra (which really covers it all!) and mixtures of the above. In the Ubbink Thesis you will see the comparison in the quality of results for triangles, quads and hexagons in 2-D.

Hrv
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Old   June 3, 2003, 09:09
Default Re: VOF status
  #6
gorka
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Hi,

I donīt know a lot about the state of the art of the VOF models, but I've just received an alert concerning this paper:

A mixed markers and volume-of-fluid method for the reconstruction and advection of interfaces in two-phase and free-boundary flows. Eugenio Aulisa, Sandro Manservisi and Ruben Scardovelli. Journal of Computational Physics, Volume 188, Issue 2, 2003.

You can see the abstract:

http://www.sciencedirect.com/science...0e847f2d593029

I hope this helps,

Gorka
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Old   June 30, 2003, 21:26
Default Re: VOF status
  #7
Ali
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Hi Paul,

I'm not sure about your problem. Did you have surface tension for two identical fluids in your test case?

If you didn't have surface tension in the test case and you have it in real two-phase flow case, maybe that's the problem.

Maybe your problem would be the large density difference between two fluids (for water-air case, density ratio is around 830). Try to use lower density ratios.

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