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

Air and Water VOF model, Error??

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 18, 2002, 02:53
Default Air and Water VOF model, Error??
  #1
boris
Guest
 
Posts: n/a
I am simulating an empty tank filled with water (water inlet is at bottom of the tank, air outlet at top) using a VOF model. Although I turned on the gravity and body force options, the results show that the air and water are mixed together rather having a clear interface with water at the bottom and air at the top. Who can tell me what's the problem? Thank you in advance.
  Reply With Quote

Old   July 18, 2002, 06:04
Default Re: Air and Water VOF model, Error??
  #2
david
Guest
 
Posts: n/a
What type of VOF you are using ? Fluent offers 4 type, right ?? DC
  Reply With Quote

Old   July 18, 2002, 22:14
Default Re: Air and Water VOF model, Error??
  #3
Boris
Guest
 
Posts: n/a
Thank you. There are three types of discretization schemes for Volume of Fluid (VOF) offered by Fluent. I tried Implicit and Geo-Restruct. The problem persists. Looking forward for your advise.
  Reply With Quote

Old   July 18, 2002, 23:45
Default Re: Air and Water VOF model, Error??
  #4
david
Guest
 
Posts: n/a
Use Geo-Restruct and also use VOF under relaxation 0.5. Try to use gradient of VOF after few time steps. You should be fine.

DC
  Reply With Quote

Old   July 19, 2002, 00:00
Default Re: Air and Water VOF model, Error??
  #5
Boris
Guest
 
Posts: n/a
Thank you for your quick reply. For Fluent 6.0, there is no under relaxation factor with Geo-Restruct. What do you mean by "gradient of VOF". Looking forward for your reply.
  Reply With Quote

Old   July 19, 2002, 04:08
Default Re: Air and Water VOF model, Error??
  #6
david
Guest
 
Posts: n/a
Try to adapt the grid based on the gradient of volume fraction of one phase.
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
multiphase model, water in air? bugra Main CFD Forum 10 January 2, 2010 14:09
air bubble is disappear increasing time using vof xujjun CFX 9 June 9, 2009 08:59
error using combination of step function xujjun CFX 1 January 15, 2008 17:46
VOF model of water film Pathway FLUENT 1 July 21, 2007 08:33


All times are GMT -4. The time now is 23:03.