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

[ICEM] Hole near sharp trailing edge of airplane/wing geometry

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

LinkBack Thread Tools Display Modes
Old   September 10, 2010, 17:50
Default Hole near sharp trailing edge of airplane/wing geometry
New Member
Join Date: Aug 2009
Posts: 6
Rep Power: 8
jlichtwa is on a distinguished road

I am meshing an airplane that has a slot at the trailing edge of the wing where the wing upper surface and flap meet (See Fig. 1). There is airflow over the wing as well as from a plenum that exits through the slot and over the flap. The top surface of the slot has a sharp trailing edge with an angle of 13 degrees (approx. the same as NACA 0010, see Fig. 2). When creating my tet mesh, I am continually getting the problem of a hole in the geometry near the sharp trailing edge. Normally there is a blunt lip instead of the sharp trailing edge, and thus this issue does not occur. I wouldnt think this should be a problem, because I know ICEM can handle sharp trailing edges with angles smaller than this. I have used thin cuts, adjusted the edge criterion (as low as 0.0001), and decreased the triangulation tolerance (1e-4), all to no avail. If anyone has any other tips, like possibly decreasing the min size on the different surfaces?, etc... it would be greatly appreciated.

Attached Images
File Type: jpg wing_and_flap.jpg (17.1 KB, 95 views)
File Type: jpg TE_angle.jpg (11.9 KB, 91 views)
jlichtwa is offline   Reply With Quote

Old   September 13, 2010, 18:33
Default Penetrating mesh elements through surfaces
New Member
Join Date: Aug 2009
Posts: 6
Rep Power: 8
jlichtwa is on a distinguished road
I thought I would post a reply to give an update. I have fixed the problem of the hole in the geometry. Now, I have a new problem (its turning into a nightmare though). I think this is because of the small angle near the trailing edge, but the mesh is penetrating through the wing upper surface and onto the upper surface of the slot/plenum. Thankfully, this is happening at a region at the intersection of two surfaces, so I can prescribe curves and points in hopes to get the mesh nodes and edges to attach to this instead of penetrating the surface and joining with the nodes and edges on the other surface which is what is happening now. I had thought to delete the curves in this region, but I need the mesh edges and nodes to be on the curves defining the geometry. When I check the mesh, I get problems such as uncovered faces, penetrating elements, multiple edges, and overlapping elements.

Any ideas?

If this is not making sense to anyone, let me know and I can put up some pictures to show what I am talking about in detail.
jlichtwa is offline   Reply With Quote

Old   September 21, 2010, 15:19
Default Edge criterion? Thin Cuts?
Senior Member
PSYMN's Avatar
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,660
Blog Entries: 1
Rep Power: 36
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Pictures always help, but it sounds like you have a thin cuts problem...

You could also reduce your edge criterion and see if that helps?

If you search you can find other posts where I have elaborated on each of these... Or check the help.
PSYMN is offline   Reply With Quote


hole, mesh, sharp, trailing edge

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
Which trailing edge is correct for meshing of aerofoils for CFX LSC CFX 0 May 10, 2009 12:45
Structured mesh of a 3d sharp trailing edge Gilles Main CFD Forum 2 May 23, 2008 13:23
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
The trailing edge velocity maximus Main CFD Forum 0 March 6, 2005 01:27
trailing edge problem Kuo Wei-Jen Main CFD Forum 2 April 14, 1999 10:09

All times are GMT -4. The time now is 00:05.