CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

meshing a sharp edge

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 2, 2002, 05:39
Default meshing a sharp edge
  #1
line
Guest
 
Posts: n/a
Hi,

I am already frustrated by the meshing process. Can anyone suggest a reading/hint/trick for me to handle the job. Should I be an expert of topology to work on this code?

I have 2 problem, please give me some idea. Thanks (1) I have to model a wind tunnel with 60m long and testing cross section is 3mto 2m. Inside the turning angle, there is a 10 guard vane which is 8mm thick. That means the overall dimension range from 8mm to 60m. Will it cause problem to the code if the size different from 3~4 magnitude of order? I already notice that, from Dave, I can use the thin film to handle the 8mm guard vane. But I have 10 guard vane? It seems it work for 3 guard vane but no more than 3!!!

(2) I have an very geometry which is for teaching purpose. It is defined by the point as a near triangle shape(with 2 side is straight line and one side is parabola) normal to x-plane with one edge connected to the sqaure in other plane. I know there is a small angle problem. I have try to put one more point into the parabola side to construct a trimmed surface. But the meshin process still fail!!!!!

Is it common problem to the code?

Thanks line

  Reply With Quote

Old   November 2, 2002, 08:03
Default Re: meshing a sharp edge
  #2
Astrid
Guest
 
Posts: n/a
Regarding problem 1:

- 3 to 4 orders of magnitude should not be the problem. I wonder what the effect of 8 mm will be on a wind tunnel of 60 m, and the other way around, but that is a different question.

- It should be possible to define 10 subdomains which gives you the possiblity to define 10 thin surfaces. Forget inflation on the thin surfaces.

- How are your surface meshes?

- Did you get a volume mesh if you write out a definition file without inflation?

Regarding problem 2:

- Does the meshing problem fails when you write out a definition file or does it already fail when you write out a surface mesh.

- Standard question: have you tried the AFI surface mesher instead of the standard Delauney surface mesher?

- How worse is your worst angle?

Astrid
  Reply With Quote

Old   November 2, 2002, 12:19
Default Re: meshing a sharp edge
  #3
Hannah liang
Guest
 
Posts: n/a
My experience is to use the 8mm gap of guide vane instead of the thin wall, then build B-rep solid in this area. In this way you can add inflation when you write the def.

  Reply With Quote

Reply

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
how to set periodic boundary conditions Ganesh FLUENT 15 November 18, 2020 07:09
[ICEM] Hole near sharp trailing edge of airplane/wing geometry jlichtwa ANSYS Meshing & Geometry 2 September 21, 2010 16:19
Which trailing edge is correct for meshing of aerofoils for CFX LSC CFX 0 May 10, 2009 13:45
Structured mesh of a 3d sharp trailing edge Gilles Main CFD Forum 2 May 23, 2008 14:23
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55


All times are GMT -4. The time now is 11:22.