# what's VOF?

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 May 26, 2001, 17:21 what's VOF? #1 wen long Guest   Posts: n/a Sponsored Links Ask an elementary question: What's VOF? Can any friend give a brief discription? Thanks a lot. wen

 May 26, 2001, 18:13 Re: what's VOF? #2 DAVE Guest   Posts: n/a I think it is some kind of method for multiphase flows...try to do a Google or yahoo query "VOF CFD"

 May 26, 2001, 18:26 Re: that's VOF? #3 Sarcasmist Guest   Posts: n/a VOF: Volume of Fluid. When one wants to solve a multiphase flow problem say an air bubble rising in water he has a choice how to solve it. 1) solve the NS eqn in the water phase, solve the NS eqn in the air phase and then see if the boundary conditions are satisfied. if not attempt a correction and try again. iterate until patience has run out. 2) Use a one-fluid formulation which reduces (or masks) the NS eqn into one equation and the correct eqn is found via an indicator function (or step function). Ie. we are in the water phase if indicator function is one and zero if indicator function is zero or on the boundary if indicator function is undefined. (much easier to impliment into existing codes) Now, VOF is a technique which is used to capture or follow this indicator function via the scalar advection equation. CAUTIONARY WARNING FOR 3-D: Not for people who failed geometry class!!!

 May 26, 2001, 18:29 Re: what's VOF? #4 Sarcasmist Guest   Posts: n/a better yet just goto the search on this site and search VOF in the general forum... There will be alot of links.

 May 27, 2001, 12:00 Re: what's VOF? #5 Mehdi BEN ELHADJ Guest   Posts: n/a See Hirt and Nichols "Voulme of Fluid VOF method for the dynamics of free boundaries", J. Comp. Phys. 39, 201-225, 1981.

 May 27, 2001, 20:18 Re: what's VOF? #6 pyhsieh Guest   Posts: n/a If you do a search in the cfd-online forum, you will be able to get lots of discussions about VOF.

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