CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

have a problem in modeling the freesurfaces?

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   August 12, 2010, 09:57
Default have a problem in modeling the freesurfaces?
  #1
Member
 
seyedashraf's Avatar
 
Omid Seyedashraf
Join Date: May 2010
Posts: 48
Rep Power: 8
seyedashraf is on a distinguished road
Send a message via AIM to seyedashraf Send a message via Yahoo to seyedashraf
im trying to model a spillway
have already designed the gambit file
but have a problem in fluent

seems the water and air are not separated
here is a screenshot






any ideas?
seyedashraf is offline   Reply With Quote

Old   August 12, 2010, 10:25
Default
  #2
Member
 
seyedashraf's Avatar
 
Omid Seyedashraf
Join Date: May 2010
Posts: 48
Rep Power: 8
seyedashraf is on a distinguished road
Send a message via AIM to seyedashraf Send a message via Yahoo to seyedashraf
by the way
in the boundry conditions screen
the velocity inlet that _is for Water flow rate_ the phase is mixture and i dont know how to change it

maybe its the reason !
seyedashraf is offline   Reply With Quote

Old   August 12, 2010, 16:08
Default
  #3
Member
 
john
Join Date: Aug 2010
Location: blacksburg, va, usa
Posts: 36
Rep Power: 8
johnp is on a distinguished road
Hi,

can you clarify what the image represents. i usually view the free surface with a contour plot of volume fraction.
johnp is offline   Reply With Quote

Old   August 13, 2010, 04:10
Default
  #4
Member
 
seyedashraf's Avatar
 
Omid Seyedashraf
Join Date: May 2010
Posts: 48
Rep Power: 8
seyedashraf is on a distinguished road
Send a message via AIM to seyedashraf Send a message via Yahoo to seyedashraf
Thanks for your Reply in here

the first screenshot was Velocity Vectors'


now this one :
display>contours > contours of phases > water



like i mentioned before
the problem is , i cannot define water and air
however in Gambit , i have created two different velocity inlets for air and water
but in fluent ....!??
seyedashraf is offline   Reply With Quote

Old   August 13, 2010, 10:30
Default
  #5
Member
 
john
Join Date: Aug 2010
Location: blacksburg, va, usa
Posts: 36
Rep Power: 8
johnp is on a distinguished road
Try this:

1. create a region (possibly more than one) for the air (Adapt -> Region)
2. initialize your solution
3. Patch the volume fraction for air into the region you created, i.e. set the volume fraction of water to zero (or VF of air to 1.0)
4. run simulation

This assumes you've set everything else up correctly (e.g. included gravity, etc.). Fluent has a VOF tutorial modeling a dambreak that may help get you started. Good luck!
johnp is offline   Reply With Quote

Old   August 14, 2010, 15:58
Default
  #6
Member
 
seyedashraf's Avatar
 
Omid Seyedashraf
Join Date: May 2010
Posts: 48
Rep Power: 8
seyedashraf is on a distinguished road
Send a message via AIM to seyedashraf Send a message via Yahoo to seyedashraf
I Appreciate your kind help

that DamBreak tutorial was really useful

Last edited by seyedashraf; August 15, 2010 at 05:57.
seyedashraf is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
A problem with solar still modeling Amir Khodabandeh FLUENT 2 April 3, 2011 21:55
A modeling problem of flow in a tube Jason CFX 0 July 21, 2004 15:29
Problem in modeling solidification S. Balasubramanyam CFX 0 January 20, 2004 10:54
modeling of coupled problem Godfrey FLUENT 4 May 22, 2002 14:52
continue the problem with RSM modeling cwflying FLUENT 3 April 28, 2002 07:48


All times are GMT -4. The time now is 19:03.