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

GGI Information

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 17, 2008, 20:39
Default GGI Information
  #1
Tristan
Guest
 
Posts: n/a
Can one of you who frequently refers questions to a page in one of the manuals tell me where I can find information about how closely the grids need to match at a GGI domain interface? I'm having some convergence issues and I'm wondering if it is because the grid spacing mismatch between the grids is too large at the interface.

Thanks,

Tristan
  Reply With Quote

Old   December 18, 2008, 14:08
Default Re: GGI Information
  #2
mic
Guest
 
Posts: n/a
The grid of the two interfaces should be as equal as possible, but what kind of problem did you get? What do you mean with "convergence issue"? Of what type? Does the analysis stop? does the mass imbalance remain high?...
  Reply With Quote

Old   December 22, 2008, 00:08
Default Re: GGI Information
  #3
Patrick
Guest
 
Posts: n/a
I've ever encounter the same problem. The tetra grid is about 3-4 times of hex grid. Also the convergence is not good. The pressure fluctuate heavily. After remesh the grid and made the two kind of grid uniform, this means the two of approximately same size. The oscillation disappeared.
  Reply With Quote

Old   January 19, 2009, 00:05
Default Re: GGI Information
  #4
HekLeR
Guest
 
Posts: n/a
This is probably more to do with the volume mesh than the surface mesh density difference at the interface.
  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
Ggi FabOr OpenFOAM 17 May 9, 2013 10:19
GGI Tolerance taner OpenFOAM Running, Solving & CFD 18 February 12, 2013 16:58
Difference between ggi and overlapGgi? GGI Tips and Tricks? philippose OpenFOAM Running, Solving & CFD 7 January 16, 2013 10:40
GGI in OpenFOAM-1.5-dev philippose OpenFOAM Running, Solving & CFD 14 November 13, 2011 15:55
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11


All times are GMT -4. The time now is 19:20.