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

Gridgen Cobalt 3D Export Issue

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 2, 2010, 11:54
Default Gridgen Cobalt 3D Export Issue
  #1
New Member
 
Join Date: Jun 2010
Posts: 9
Rep Power: 7
AeroCat is on a distinguished road
I have used Gridgen's Anisotropic feature for the first time to build an unstructured grid around an aircraft. The total cell count is roughly 15 million.

I set the BC's, and when I try to export the analysis data I get a face allocation error. I realize that Gridgen is limited in memory usage with 32 byte and all.

Pointwise suggested I import the grid into Pointwise since it is 64 byte. When I try to do this, it stops and hangs at 78% when reading the .gg file.

Anyone have any advice? I'm running on a Dell workstation with 48 Gb of RAM running Vista.
AeroCat is offline   Reply With Quote

Old   September 3, 2010, 12:22
Default
  #2
New Member
 
Carolyn Dear
Join Date: Sep 2010
Location: Fort Worth, TX
Posts: 2
Rep Power: 0
carodear is on a distinguished road
Quote:
Originally Posted by AeroCat View Post
I have used Gridgen's Anisotropic feature for the first time to build an unstructured grid around an aircraft. The total cell count is roughly 15 million.

I set the BC's, and when I try to export the analysis data I get a face allocation error. I realize that Gridgen is limited in memory usage with 32 byte and all.

Pointwise suggested I import the grid into Pointwise since it is 64 byte. When I try to do this, it stops and hangs at 78% when reading the .gg file.

Anyone have any advice? I'm running on a Dell workstation with 48 Gb of RAM running Vista.
Hi AeroCat,

I should be able to help you. Do you mind answering a couple of questions first?

What versions of Gridgen and Pointwise are you using currently?

Do you have a Linux workstation available? A 64-bit version of Gridgen is available for Linux platforms. If you have one, this is an easy way to get around the memory limitation.

For the grid you generated, how many blocks does it contain?
carodear is offline   Reply With Quote

Old   September 5, 2010, 19:44
Default
  #3
New Member
 
Join Date: Jun 2010
Posts: 9
Rep Power: 7
AeroCat is on a distinguished road
Hi Carolyn,

I uploaded my grid so that George could take a look. Haven't heard back from him yet. He was the one suggesting that I export the grid and then import it in Pointwise. When I went to import into Pointwise, it got stuck on me.

We have the latest version of Gridgen. Whenever we get the notice that a new version is out we update it.

No access to a Linux workstation.

One block. I realize that is probably part of what is giving me fits, but there really wasn't any need to break it up into smaller blocks. I guess I could try to turn on the MaxBlockSize thing on the unstructured solver and limit my block size. Any recommendations on what size?
AeroCat is offline   Reply With Quote

Old   September 7, 2010, 10:20
Default
  #4
New Member
 
Carolyn Dear
Join Date: Sep 2010
Location: Fort Worth, TX
Posts: 2
Rep Power: 0
carodear is on a distinguished road
Hi AeroCat,

Last week we just released Gridgen V15.16 and Pointwise V16.03 R4. You may not have had time to try these versions yet.

Both versions contain a good number of bug fixes that I think could help your situation. Could you double-check to see if they've been installed yet and let me know?

Also, what solver are you exporting to? Each solver's export routine is a little different and some use a bit more memory than others to get a grid out.

Thanks!
carodear 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
[ICEM] Export mesh to Gridgen ali987 ANSYS Meshing & Geometry 2 January 2, 2010 13:20
OpenFOAM on MinGW crosscompiler hosted on Linux allenzhao OpenFOAM Installation 127 January 30, 2009 20:08
Fluent Export Command Issue .... Leo Hindarto FLUENT 0 January 4, 2009 00:20
Gridgen Export to Fluent5/6 failure due to memory ND Pointwise & Gridgen 2 September 1, 2007 10:28
Gridgen to Tgrid export Vincent FLUENT 1 July 22, 2006 14:02


All times are GMT -4. The time now is 13:58.