Free Surface Monitoring

Reyhaneh Sadat Ghazanfari · April 14, 2011, 06:37

Hi
I want to define free surface level(water surface position) . How can I do this?My Model is 3D open channel. I've used VOF method.
Any help and recommendation?
Many Thanks

kbaker · April 14, 2011, 07:32

Go to surface>iso surface then choose surface of constant as phases>volume fraction and set vof value as 0.5 then press create

Reyhaneh Sadat Ghazanfari · April 14, 2011, 09:13

Dear Kbaker
Thanks for your reply. I mean how can I define free surface level on a specific surface? I want to define free surface on the side walls of my channel.my is case 3d modeling of supercritical flow in channel bends.the side walls of my case are curves .
Best Regards
Reyhaneh

kbaker · April 15, 2011, 09:20

I am not understood your request completely however i will suggest you for using open channel flow boundary if you have a channel flow then you need just to enter the free surface level value hope it works with you. What you mean with curves at walls ? did you mean with it curved interfaces?

Reyhaneh Sadat Ghazanfari · April 15, 2011, 14:22

Dear Kbaker
Thanks for not giving up.sorry for not well requested question. I mean what should I do if I want to define and see the free surface JUST on a SPECIFIC SURFACE such as on one of the side walls of channel? If Use ISO Surface it'll give me free surface with defined vof in the whole domain including interior. But I don't want it.
Thank you both for your time and opinion.
Reyhaneh

kbaker · April 16, 2011, 15:42

I think you can try to draw an iso-surface with vof=0.5 then go for display>contours select grid for contours and the coordinates should be chosen your wall coordinate that you want to draw the surface along it then select surface as the iso-surface you create in the first (i.e. with vof=0.5) then click display and see if it will succeeded with you.

Reyhaneh Sadat Ghazanfari · April 17, 2011, 06:52

Dear Kbaker
Many thanks for your reply. what do you mean by wall coordinate? the only available options for Grid are:z-coordinate,y-coordiante,x-coordinate.
Best Regards

kbaker · April 18, 2011, 01:10

Yes you right its the same as you mentioned

Reyhaneh Sadat Ghazanfari · April 18, 2011, 06:55

:-) Then what should I do?

kbaker · April 21, 2011, 00:37

You need to create an iso-surface with vof=0.5 as i told you in my previous posts then go to contours and select the grid as x or y or z reference to your wall you need select the coordinate that parallel to your wall and click views.

Reyhaneh Sadat Ghazanfari · April 22, 2011, 11:54

Many thanks Dear Khalid.

April 14, 2011, 06:37	Free Surface Monitoring	#1
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	Hi I want to define free surface level(water surface position) . How can I do this?My Model is 3D open channel. I've used VOF method. Any help and recommendation? Many Thanks

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April 14, 2011, 07:32		#2
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	Go to surface>iso surface then choose surface of constant as phases>volume fraction and set vof value as 0.5 then press create

April 14, 2011, 09:13		#3
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	Dear Kbaker Thanks for your reply. I mean how can I define free surface level on a specific surface? I want to define free surface on the side walls of my channel.my is case 3d modeling of supercritical flow in channel bends.the side walls of my case are curves . Best Regards Reyhaneh

April 15, 2011, 09:20		#4
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	I am not understood your request completely however i will suggest you for using open channel flow boundary if you have a channel flow then you need just to enter the free surface level value hope it works with you. What you mean with curves at walls ? did you mean with it curved interfaces?

April 15, 2011, 14:22		#5
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	Dear Kbaker Thanks for not giving up.sorry for not well requested question. I mean what should I do if I want to define and see the free surface JUST on a SPECIFIC SURFACE such as on one of the side walls of channel? If Use ISO Surface it'll give me free surface with defined vof in the whole domain including interior. But I don't want it. Thank you both for your time and opinion. Reyhaneh

April 16, 2011, 15:42		#6
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	I think you can try to draw an iso-surface with vof=0.5 then go for display>contours select grid for contours and the coordinates should be chosen your wall coordinate that you want to draw the surface along it then select surface as the iso-surface you create in the first (i.e. with vof=0.5) then click display and see if it will succeeded with you.

April 17, 2011, 06:52		#7
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	Dear Kbaker Many thanks for your reply. what do you mean by wall coordinate? the only available options for Grid are:z-coordinate,y-coordiante,x-coordinate. Best Regards

April 18, 2011, 01:10		#8
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	Yes you right its the same as you mentioned

April 18, 2011, 06:55		#9
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	:-) Then what should I do?

April 21, 2011, 00:37		#10
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	You need to create an iso-surface with vof=0.5 as i told you in my previous posts then go to contours and select the grid as x or y or z reference to your wall you need select the coordinate that parallel to your wall and click views.

April 22, 2011, 11:54		#11
Reyhaneh Sadat Ghazanfari New Member Reyhaneh Sadat Ghazanfari Join Date: Nov 2010 Posts: 10 Rep Power: 15	Many thanks Dear Khalid.