# Need help For VOF Modeling result

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 August 25, 2011, 16:16 Need help For VOF Modeling result #1 New Member   Pooya Join Date: May 2010 Posts: 26 Rep Power: 8 Hello Freinds! as i described before I'm working on a problem of Catamaran hydrodynamic analysis in fluent. but when solving procedure is finished and i want to show the free surface position with VOLUME FRACTION value Fluent show me the surface the uniform surface.it means that when i choose the phase-2 it shows me the surface with Volume fraction number=1 and when i choose the phase-1 shows me the VOF=0 !!!! please help me ! where is the problem??? THNANKS

August 26, 2011, 13:18
#2
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Pooya
Join Date: May 2010
Posts: 26
Rep Power: 8
Quote:
 Originally Posted by Yapoo Hello Freinds! as i described before I'm working on a problem of Catamaran hydrodynamic analysis in fluent. but when solving procedure is finished and i want to show the free surface position with VOLUME FRACTION value Fluent show me the surface the uniform surface.it means that when i choose the phase-2 it shows me the surface with Volume fraction number=1 and when i choose the phase-1 shows me the VOF=0 !!!! please help me ! where is the problem??? THNANKS
Any body Can't help me????

 August 26, 2011, 19:38 #3 New Member   Join Date: Mar 2011 Posts: 3 Rep Power: 7 Is phase-1 the air and phase-2 the water? It seems correct for me? You didn't mention where are you looking at. If you are looking on the water and air boundary, you should see 0.5. Yapoo likes this.

August 27, 2011, 02:26
#4
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Pooya
Join Date: May 2010
Posts: 26
Rep Power: 8
Quote:
 Originally Posted by rogerspass Is phase-1 the air and phase-2 the water? It seems correct for me? You didn't mention where are you looking at. If you are looking on the water and air boundary, you should see 0.5.
yes phase1 is air and phase2 is liquid water
i looking for it on the water and air boundary but only see 0 or 1 for VOF.
???!!!

 August 28, 2011, 13:04 #5 Senior Member     Vieri Abolaffio Join Date: Jul 2010 Location: Always on the move. Posts: 308 Rep Power: 9 create an isosurface of vof = 0.5. this is your freesurface Yapoo likes this.

August 29, 2011, 14:04
#6
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Pooya
Join Date: May 2010
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Quote:
 Originally Posted by sail create an isosurface of vof = 0.5. this is your freesurface
Thank you my freind!
I'll do that and then explain what will happened to you!

September 11, 2011, 09:51
Sos>>!
#7
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Pooya
Join Date: May 2010
Posts: 26
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Quote:
 Originally Posted by Yapoo Thank you my freind! I'll do that and then explain what will happened to you!
I Did that but still the answer is incorrect
Need A Emergency help from someone that has VOF Modeling Experiences in Fluent

 September 11, 2011, 23:50 #8 New Member     sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 7 In VOF analysis, boundary can be considered as regions with abrupt change of phases. So in your case also there are abrupt change ( 1 to 0) regions. So they are the boundaries.

 September 12, 2011, 03:29 #9 Senior Member     Svetlin Philipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 9 Hi, what tool do you use to show results? Check again that you did the calculation properly. If your domain is full of one of the phases then your results are correct. To check this: look at the domain volume and compare with the volume of the phase with vf=1.

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