CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[GAMBIT] Surface Meshing Issues in Gambit

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 26, 2009, 12:04
Question Surface Meshing Issues in Gambit
  #1
Member
 
Forrest's Avatar
 
Join Date: Mar 2009
Location: Texas
Posts: 32
Rep Power: 8
Forrest is on a distinguished road
I have a pipe with a square hole (cut out of the pipes side) that I would like to mesh in Gambit. I have simplified the problem by using the symmetry of the domain. I have three volumes that will eventually be meshed: (1) the interior volume of the pipe, (2) the volume of the hole, and (3) the volume around the pipe. I have already successfully meshed the volume of the hole in the pipe as seen in Image 1 (the orange mesh in the photos). I am trying to mesh the shaded face in Image 2. I want to use hexahedral elements with the map scheme on this face, but Gambit says that the face is not a mapable region and uses the submap scheme to generate the mesh shown in Image 3. I want a nice non-skewed mesh because I'm going to use the Cooper scheme to mesh the outer volume. Is it the inner mesh that messing up my face mesh? Is there anyway that I can fix this or is there a better approach to meshing my domain than splitting it into three volumes and meshing each one separately? Thanks in advance!





Forrest is offline   Reply With Quote

Old   March 26, 2009, 14:49
Default
  #2
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,973
Rep Power: 30
-mAx- will become famous soon enough
decompose the shaded surface in 2 surfaces (with revolution around the axis).
One surface will be beyond the orange mesh
One surface will be below the orange surface
The last surface will be the "projection" of the orange mesh.
I hope you will understand
Anyway the you should be able ton have 3 nice mappable surface meshes
-mAx- is offline   Reply With Quote

Old   March 26, 2009, 15:57
Default
  #3
Member
 
Forrest's Avatar
 
Join Date: Mar 2009
Location: Texas
Posts: 32
Rep Power: 8
Forrest is on a distinguished road
Ok, I was able to split the surface (using the split surface command with virtual edges). After trying to mesh these new faces, I found that I need to modify my edge meshes so that they have even numbers of intervals. I didn't do anything with the orange mesh since I assume that Gambit will connect the outer volume mesh with the orange one. Was the way I did it what you had in mind MAX?
Forrest is offline   Reply With Quote

Old   March 27, 2009, 01:53
Default
  #4
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,973
Rep Power: 30
-mAx- will become famous soon enough
hmm... did you already created the edges for splitting? because on the pictures I didn't see any edges for the split I mean.
On the second picture I only see the possibility to split the surface with vertices (On the left side , it seems to be 3 vertices which are symetric to the one on your orange mesh).
If you see what I mean, try to split the shadded surface with a pair of two opposite vertices. I will generates a semi-circle. If it's ok, do the same for creating the 2 next curves.
-mAx- is offline   Reply With Quote

Old   March 27, 2009, 15:22
Default
  #5
Member
 
Forrest's Avatar
 
Join Date: Mar 2009
Location: Texas
Posts: 32
Rep Power: 8
Forrest is on a distinguished road
Thanks max! What you suggested worked great. I was able to split the original shaded region into three new faces and after some finagling I was able to mesh it using quad/map (as you can see below). I had to remove the orange volume mesh to get the edge mesh back for gambit to be happy, but it went back together nicely. Thanks again.

Forrest 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
Problem with Gmsh nishant_hull Open Source Meshers: Gmsh, Netgen, CGNS, ... 21 Today 10:42
meshing of two-stroke engine in gambit ravi FLUENT 2 January 18, 2012 02:14
problem meshing in GAMBIT khairul hadi Main CFD Forum 1 August 20, 2008 17:13
Gambit 2.0 and 2.2 STAIRSTEP meshing difference PaweĊ‚ FLUENT 0 October 15, 2006 10:34
meshing 3 connected volumes with gambit Miguel FLUENT 1 July 20, 2006 05:50


All times are GMT -4. The time now is 16:16.