CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Mesh Generation & Pre-Processing Software > Pointwise & Gridgen

Initialization failing when trex unstructured block

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 9, 2017, 14:40
Default Initialization failing when trex unstructured block
  #1
New Member
 
Matthew Schwartz
Join Date: Jul 2017
Posts: 3
Rep Power: 7
mschwart is on a distinguished road
Hello!

I am struggling to fill an unstructured block with cells using trex. I have attached pictures of the whole block I am trying to mesh, as well as the close up of what I know is my problem area. I have messed with this weird domain several times to try to fix the large skewness/small angle triangles that I am getting in the corners.

The reason the whole square part is diagonalized and not unstructured is because I am meshing a wind tunnel, and I am hoping to get the actual tunnel portion of the wind tunnel to be structured. I am hoping to make the stilling chamber (the quarter symmetry of which is shown) unstructured, but connecting it to the structured wind tunnel. Does anyone have any suggestions for how I may clean up this domain a bit?

Thank you for your help and your time!
Attached Images
File Type: png Whole.PNG (95.0 KB, 48 views)
File Type: png Front View.PNG (47.4 KB, 39 views)
File Type: png Closeup.PNG (38.8 KB, 32 views)
mschwart is offline   Reply With Quote

Old   November 11, 2017, 16:07
Default
  #2
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 275
Rep Power: 16
jchawner is on a distinguished road
Hello Matthew:

The closeup picture gives me a pretty good idea of the problem. The surface mesh there seems to have a very large jump in edge length from the quad to tri region. T-Rex is sensitive to the quality of the initial surface mesh from which it extrudes the volume mesh.

My suggestion is to update the tri mesh so that the cells near the quad mesh are roughly the same size. They can grow large as you move away from that boundary.

Hope that helps.
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   November 13, 2017, 18:29
Default
  #3
New Member
 
Matthew Schwartz
Join Date: Jul 2017
Posts: 3
Rep Power: 7
mschwart is on a distinguished road
Thank you for your help! I have tried fixing those cells, I have posted a picture of the new close up, and it looks a lot cleaner, but it still won't initialize. Do you have any other suggestions? I can't thank you enough for your time and help!
Attached Images
File Type: png closeup2.PNG (83.1 KB, 33 views)
mschwart is offline   Reply With Quote

Old   November 15, 2017, 09:38
Default
  #4
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 275
Rep Power: 16
jchawner is on a distinguished road
Matthew, I think at this point it would be best if you contacted our technical support engineers at support@pointwise.com. Have your Customer ID handy.
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Reply

Tags
trex, unstructured

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
can't export analysis data with unstructured meshed block yhs0365 Pointwise & Gridgen 0 September 18, 2017 00:42
[gridgen problem] can't export analysis data of unstructured meshed block yhs0365 CFX 1 September 18, 2017 00:40
Trex Block Initialization Assasin Pointwise & Gridgen 1 June 24, 2015 12:15
[blockMesh] Mixer mesh - negative volume problem jadtwo OpenFOAM Meshing & Mesh Conversion 2 November 6, 2014 17:37
[Commercial meshers] Icem Mesh to Foam jphandrigan OpenFOAM Meshing & Mesh Conversion 4 March 9, 2010 03:58


All times are GMT -4. The time now is 21:26.