|
[Sponsors] |
What's the correct unstructured mesh procedure |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
January 11, 2011, 06:17 |
What's the correct unstructured mesh procedure
|
#1 |
Senior Member
Nick
Join Date: Nov 2010
Posts: 126
Rep Power: 15 |
Hi,
I'm quite new to ICEM. I was wondering about the correct unstructured mesh procedure. I have a problem in this regard. Once I set curve nodes parameters and mesh the face everything looks neat. However when I use volume mesh and tick the use existing mesh option, the generated mesh looks distored and not orderly at all. What am I doing wrong? What's the right way to generate a mesh using an existing surface mesh. Thanks in advance. |
|
January 11, 2011, 10:28 |
|
#2 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 733
Rep Power: 25 |
The way I make unstructured meshes in ICEM is after setting all the part, surface, density, curve sizings etc:
1. Make an octree mesh and delete the volume elements. Check and smooth the surface elements until they are a high quality. 2. Run Delaunay (with TGlib and AF) from the existing surface mesh. Check and smooth as mentioned above. 3. Run prism mesh. Check and smooth (careful with smoothing with PENTA_5 active though). 4. Export mesh to solver. |
|
January 12, 2011, 17:42 |
|
#3 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
The "Use existing mesh" option actually uses the "make consistent" command to make the octree volume mesh consistent with the previous surface mesh.
You would use that option if you had certain faces that you needed meshed in a certain way (such as fillets), perhaps to match up with another part or for some other reason. Many users just go straight to Octree Tetra (as SIW suggested) and use the top down method. This approach first subdivides the volume and then fits to the surface to produce the surface mesh. It is very robust, patch independent and can walk over lots of problems (like a shrinkwrap). However, some people are looking for more patch aligned mesh. If you want to start with a surface mesh, you could just use one of the other Tetra methods (such as Delaunay or Advancing Front Tetra). These start at the surface mesh boundary and fill the volume. They are faster than Octree mesh, and given a good surface mesh, will produce a better volume mesh. You should only use the option to "Use existing Mesh" option if you want your model mostly patch independent but also have some parts with existing mesh. I don't know why it didn't work in your case. I would guess the problem was the selected part names, you must select the part names of the mesh you wish too keep. |
|
January 12, 2011, 18:40 |
|
#4 |
Senior Member
Nick
Join Date: Nov 2010
Posts: 126
Rep Power: 15 |
Thanks guys. You rock. I'll try your suggestions and get back to you if I have questions.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[Other] 2D unstructured mesh | majidhojjat | OpenFOAM Meshing & Mesh Conversion | 1 | May 14, 2009 17:09 |
Structured and Unstructured mesh | Jingwei | FLUENT | 0 | March 2, 2009 21:29 |
Problem with solving for unstructured mesh | evgenii | OpenFOAM Running, Solving & CFD | 5 | November 27, 2006 04:37 |
[Commercial meshers] Unstructured hex mesh | lr103476 | OpenFOAM Meshing & Mesh Conversion | 12 | November 24, 2006 05:56 |
2D Modelling using unstructured mesh | Yingchun | CFX | 8 | December 12, 2005 06:05 |