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Friday, January 8, 2010

CFD Simulations : Volume-of-Fluid Methods / Articles / Comparison Tests

As most of multiphase guys are aware: the VOF model is a surface-tracking technique applied to a fixed Eulerian mesh - designed for two or more immiscible fluids where the position of the interface between the fluids is of interest.

Importantly, in the VOF model, a single set of momentum equations is shared by the operating fluids, and the volume fraction of each of the fluids in each computational cell is tracked throughout the domain. Applications of the VOF model include stratified flows, free-surface flows, filling, sloshing, the motion of large bubbles in a liquid, the motion of liquid aftera dam break, the prediction of fluid jet breakup due to surface tension effects, and the transient tracking of any liquid-gas interface leading to steady state approximation.

The VOF methods are particularly suited when the interface needs to be correctly determined. Clearly, this denotes that operating flow scales would then be interest as well. Vast applications of VOF listed above are very frequently seen in industries and the methodology has gained far acceptance and is included in almost every discussion based on multiphase flows.

The only disadvantage - based on current computing trends - is that it requires a fine mesh to resolve the scales - in essence - DNS like privileges...which may or may not be possible in typical industrial settings...

a quickk Lecture on introduction to multiphase modeling can be used to get acquainted with the topic

1. http://www.chmltech.com/cfd/multiphase.pdf

2. http://www.ae.uiuc.edu/~loth/CUP/Ch1text.pdf

Some recent studies based on VOF is listed here:

1. VOF methods to simulate wavy falling film flow : http://boiling.seas.ucla.edu/Publications/GMD2003.pdf

2. Flow3D VOF runs: http://www.flow3d.com/pdfs/tp/micro_tp/FloSci-Bib12-09.pdf
(Nice comparisons with experiments - visual images ...)

3. VOF using ADINA software : http://www.adina.com/adinadownloads/primer/prob32.pdf

4. Numerical methods: Height function based Contact angle formulation

http://individual.utoronto.ca/afkhami/conferences/SCA2006.pdf

5. nice publication on modeling surfzone bubbles using VOF

http://chinacat.coastal.udel.edu/papers/shi-etal-icce08.pdf

6. Article on VOF methods applied to non-linear problems on body-fitted grids

http://www.iwwwfb.org/Abstracts/iwwwfb11/iwwwfb11_17.pdf

7. An article presenting the computational results achieved by performing CFD analysis of bubble columns using VOF model can be downloaded from

http://www.aidic.it/cet/09/18/098.pdf

In particular, the article provides comparison of the commercial and opensource solvers with experiments. Some experimental images provided in the article can be used as reference.

8. Work on PLIC-VOF

http://www.brunel.ac.uk/controls/common/getImage.aspx?imageId=69


Some comparison articles:

1. CICSAM vs HRIC : http://www.ptmts.org.pl/Waclaw-Koron-2-08.pdf

2. STACS vs rest :http://webfea-lb.fea.aub.edu.lb/CFD/pdfs/publications2/STACS-Complete.pdf

3. CICSAM vs STACS : I found a link in ASME proceedings but was unable to download the paper.

http://link.aip.org/link/abstract/ASMECP/v2007/i42894/p347/s1

An wonderful lecture I came across detailing several aspects of moving boundary problems with elaborate discussions on methods and applications

http://www.ims.nus.edu.sg/Programs/fluiddynamic/files/Lecture1-basics.pdf

Again, the publications posted here are merely those i came across in recently and in time, ill try to post several other articles of interest in this area...

Keep VOFing !

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