CFD Online Logo CFD Online URL
Home > Forums > ANSYS Meshing & Geometry

[ICEM] Thin Wall Problems

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

LinkBack Thread Tools Display Modes
Old   June 17, 2011, 14:43
Default [ICEM] Thin Wall Problems
New Member
Join Date: Jul 2009
Posts: 14
Rep Power: 8
just-right is on a distinguished road
I am meshing a wing like shape in close proximity to the ground. The geometry is 2 mm thick with an endplate on the side.

I am having problems with patch dependent meshing in relation to the points and the edges. Some nodes do not obay the surface, edges or nodes and actually penetrate the opposite surface.

I am currently using the following approach:

- Import geometry
- Name surfaces
- Keep curves and points
- Set global mesh sizes and enable curvature/proximity
- Change edge criterion

The mesh is full of errors because of these overlapping surface nodes. Could somebody recommend how to approach this problem with the exception of just creating 2 mm element all over the geometry?

I have seperated the large surfaces and the small surfaces. There seems great sensitivity to the edge criterion. However, even though the curves that define the edges as well as the points are still there no consistency in the meshing process is present.

I have enclosed two pictures that should represent some of the problems I am having

The surface on the right is the symmetry plane it can be seen that it interchanges with the other surfaces.

The surface mesh is so deformed that it penetrates the other surface.

I have been using the "define thin cuts" approach with improvements. It resolves the small areas a lot better, however, I still encounter various difficulties. Primarily the area where the small faces and the larger faces of the diffuser meet the edge is maintained. Near the edge where the horizontal and vertical face of the diffuser meet it is not maintaind:

This problem occurs in the same region every time and it leads me to believe it is a function of the algorithm.

The current settings also don't obay the red lines between the symmetry plane and the actual geometry. Sometimes triangular faces of the symmetry plane collaps to the geometry in question and vice versa. It also regularly create piramid shapes by not connecting nodes to the curve:

I would imagine there is a solution to this problem. I have tried edge criterion but in combination with the thin cuts it results in a lot of holes in the mesh.
just-right is offline   Reply With Quote

Old   June 17, 2011, 15:30
New Member
Join Date: Jul 2009
Posts: 14
Rep Power: 8
just-right is on a distinguished road
Unfortunately my colleagues can't help as they use different meshing software. One of them meshed the problem in workbench and it worked without any of the above problems. However, ICEM is a lot faster and I would like to know if there is solution to the inconcistencies I am having.
just-right is offline   Reply With Quote


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
Natural convection in a closed domain STILL NEEDING help! Yr0gErG FLUENT 3 June 12, 2013 02:12
StitchMesh on two patches anita OpenFOAM Native Meshers: blockMesh 31 April 4, 2013 11:51
problems for the flow over flat wall iilw1314 Main CFD Forum 0 March 19, 2010 05:53
display steamlines in the thin wall Ridha FLUENT 2 August 3, 2005 16:26
Wall functions Abhijit Tilak Main CFD Forum 6 February 5, 1999 02:16

All times are GMT -4. The time now is 16:22.