Need help For VOF Modeling result

Yapoo · August 25, 2011, 16:16

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

Yapoo · August 26, 2011, 13:18

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????

rogerspass · August 26, 2011, 19:38

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 · August 27, 2011, 02:26

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.
???!!!

sail · August 28, 2011, 13:04

create an isosurface of vof = 0.5. this is your freesurface

Yapoo · August 29, 2011, 14:04

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!

Yapoo · September 11, 2011, 09:51

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

PLEASE!!!!! SOS!

sabin · September 11, 2011, 23:50

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.

Philipov · September 12, 2011, 03:29

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.

August 25, 2011, 16:16	Need help For VOF Modeling result	#1
Yapoo New Member Pooya Join Date: May 2010 Posts: 26 Rep Power: 15	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, 19:38		#3
rogerspass New Member Join Date: Mar 2011 Posts: 3 Rep Power: 15	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 28, 2011, 13:04		#5
sail Senior Member Vieri Abolaffio Join Date: Jul 2010 Location: Always on the move. Posts: 308 Rep Power: 16	create an isosurface of vof = 0.5. this is your freesurface Yapoo likes this.

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September 11, 2011, 23:50		#8
sabin New Member sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 14	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
Philipov Senior Member Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 17	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.