Need help to show volume fraction in Fluent

lehoanganh07 · October 19, 2012, 08:39

Hi everybody!
I am modeling cavitation in pump, but when display the Contours/phase/ Volume fraction for vapor, i have picture like this( TK-xamthuc-thaydoiap-0.3-phahoi21.jpg).
But i saw some one who can show Vapor volume fraction as the picure image008.gif and image016.jpg.
So please help me how to do like that. Thank you very much

Marion · October 19, 2012, 09:24

Hi,
You have plotted contours of volume fraction, whereas the pictures you want to produce are iso surfaces of volume fraction. to do that, you go to surface/iso-surfaces.
I hope this helps,
Marion.

lehoanganh07 · October 19, 2012, 21:54

Thank Marion,
I try to do that but it is still not working.

eng_s_sadeghi · October 20, 2012, 12:59

Quote:

Originally Posted by lehoanganh07

Hi everybody!
I am modeling cavitation in pump, but when display the Contours/phase/ Volume fraction for vapor, i have picture like this( TK-xamthuc-thaydoiap-0.3-phahoi21.jpg).
But i saw some one who can show Vapor volume fraction as the picure image008.gif and image016.jpg.
So please help me how to do like that. Thank you very much

You should use iso-surfaces, The two photos have been taken using iso-surfaces.

lehoanganh07 · October 20, 2012, 23:10

Thank for your help! But I can not creat Iso-surface on my model.
Please help me!

Marion · October 22, 2012, 08:23

Hi,
Why isn't it working?
Looking at your contour plot, I saw that you only have a max of 8.10E-5 for your volume fraction - that is very very small... Are you trying to create iso surfaces below this value?
Marion.

lehoanganh07 · October 22, 2012, 09:58

Quote:

Originally Posted by Marion

Hi,
Why isn't it working?
Looking at your contour plot, I saw that you only have a max of 8.10E-5 for your volume fraction - that is very very small... Are you trying to create iso surfaces below this value?
Marion.

yes, I did it but it is still as this picture, I can not display bubble which is the same 2 picture I posted.

Marion · October 23, 2012, 05:26

Hi,
When you create the iso-surface, DO NOT select a surface on the right hand side of the panel. That way it will create an iso surface for your domain, not on an existing surface (which I assume is what we see on your last picture)
Marion.

rgd · August 12, 2014, 03:03

I'm a beginner with CFD, Fluent, Multiphase & VOF. So please bear with me if my question is too obvious.
I am modeling a distributor, with 1 inlet & 4 outlets, trying to find the volume fraction of my 2nd phase & have been following the instructions I found here & in the manual. But somehow I ended up with this (attached pic) 2 distributors instead of one!!!!
& the gradient of results is stuck in 3.5e-1 for all colors!!
I don't know what I did wrong
Please help me

October 19, 2012, 09:24		#2
Marion Senior Member Marion Join Date: Jul 2012 Location: France Posts: 122 Rep Power: 14	Hi, You have plotted contours of volume fraction, whereas the pictures you want to produce are iso surfaces of volume fraction. to do that, you go to surface/iso-surfaces. I hope this helps, Marion. lehoanganh07 likes this.

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October 19, 2012, 21:54		#3
lehoanganh07 Member le hoang anh Join Date: Oct 2012 Posts: 96 Rep Power: 13	Thank Marion, I try to do that but it is still not working.

October 20, 2012, 23:10		#5
lehoanganh07 Member le hoang anh Join Date: Oct 2012 Posts: 96 Rep Power: 13	Thank for your help! But I can not creat Iso-surface on my model. Please help me!

October 22, 2012, 08:23		#6
Marion Senior Member Marion Join Date: Jul 2012 Location: France Posts: 122 Rep Power: 14	Hi, Why isn't it working? Looking at your contour plot, I saw that you only have a max of 8.10E-5 for your volume fraction - that is very very small... Are you trying to create iso surfaces below this value? Marion.

October 23, 2012, 05:26		#8
Marion Senior Member Marion Join Date: Jul 2012 Location: France Posts: 122 Rep Power: 14	Hi, When you create the iso-surface, DO NOT select a surface on the right hand side of the panel. That way it will create an iso surface for your domain, not on an existing surface (which I assume is what we see on your last picture) Marion.