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

Symmetry B.C. Not Working?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 25, 2007, 23:09
Default Symmetry B.C. Not Working?
  #1
XC
Guest
 
Posts: n/a
Dear All,

The physical flow/geometry is symmetric and I don't have any problem to set up the symmetry BCs and run my case.

However, when I check the result, the distribution (P & T) is not correct: For example, the "whole" distribution should be a "bell" shape. I used the symmetry condition to obtain one "half" bell, but mirroring the "half" bells gives a bell with a "dent" in the center. I tried different cases and it does not look like the problem of meshing.

Please help if you experienced similar issues. Many thanks.

xc
  Reply With Quote

Old   October 26, 2007, 08:14
Default Re: Symmetry B.C. Not Working?
  #2
Leverkin
Guest
 
Posts: n/a
Hello there,

I had the same problem and i change my geometry so the plane or axis of symmetry lies on the x-axis and i set the B.C. from symmetry to axis. This worked for me.
  Reply With Quote

Old   October 26, 2007, 09:36
Default Re: Symmetry B.C. Not Working?
  #3
XC
Guest
 
Posts: n/a
Hello Leverkin,

Thank you very much for your inputs.

Did you have a chance to ask for Fluent Technical Support why it happens? You are smart to change the symmetry to axis and make it work. However, what should we do if we have more than one symmetric BC, for example, 1/4 the whole domain? I just cannot believe Fluent fails for such a common CFD issue.

Thank you again for your help. Have a nice day.

xc

  Reply With Quote

Old   October 27, 2007, 05:54
Default Re: Symmetry B.C. Not Working?
  #4
Leverkin
Guest
 
Posts: n/a
Hello there,

to tell you the truth i have not come up with such a proble again.

Try to set your BC from "symmetry" to "wall" with zero fluxes for all your values (just us symmetry works). Maybe this will lead you in the solution you seak.

Have a nice day.

  Reply With Quote

Old   October 27, 2007, 11:14
Default Re: Symmetry B.C. Not Working?
  #5
XC
Guest
 
Posts: n/a
Hello Leverkin,

Thank you for your response. I tried the "slip" wall. Nothing is improved. Sad. Welcome any inputs. Thanks.

xc
  Reply With Quote

Old   November 2, 2007, 03:21
Default Re: Symmetry B.C. Not Working?
  #6
Ahmed Yakyaki
Guest
 
Posts: n/a
Is it 2D OR 3D case?
  Reply With Quote

Old   November 2, 2007, 15:12
Default Re: Symmetry B.C. Not Working?
  #7
XC
Guest
 
Posts: n/a
3D
  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
[ICEM] Blocking and Symmetry BrolY ANSYS Meshing & Geometry 32 August 24, 2012 03:13
Symmetry or Axis B.C ?? L. Hamid Main CFD Forum 2 May 20, 2011 06:27
symmetry b.c nazari FLUENT 1 January 13, 2009 02:41
problem with Symmetry boundary condition Miri FLUENT 1 November 15, 2006 14:09
SYMMETRY + PERIODIC B.C....I need Help! JB FLUENT 6 January 14, 2005 08:03


All times are GMT -4. The time now is 17:40.