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Need help For VOF Modeling result

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Old   August 25, 2011, 16:16
Exclamation Need help For VOF Modeling result
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Pooya
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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
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Old   August 26, 2011, 13:18
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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????
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Old   August 26, 2011, 19:38
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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.
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Old   August 27, 2011, 02:26
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Originally Posted by rogerspass View Post
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.
???!!!
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Old   August 28, 2011, 13:04
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create an isosurface of vof = 0.5. this is your freesurface
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Old   August 29, 2011, 14:04
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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!
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Old   September 11, 2011, 09:51
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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

PLEASE!!!!! SOS!
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Old   September 11, 2011, 23:50
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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.
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Old   September 12, 2011, 03:29
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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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