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

grid aspect ratio and skew

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 8, 2001, 02:53
Default grid aspect ratio and skew
  #1
Darcy
Guest
 
Posts: n/a
Hellow everybody

Does somebody test the grid quality accepted by CFX solver? Pls. tell me that with what grid aspect ratio and skew the CFX solver will give a best solution. This question can be anwsered on the base of any type of flow problem.

Darcy
  Reply With Quote

Old   March 8, 2001, 06:54
Default Re: grid aspect ratio and skew
  #2
James Date
Guest
 
Posts: n/a
Darcy, i'm afraid you question is problem specific. You need to do your own grid studies to determine how aspect ratio and skew changes affect your solution.

Regards James
  Reply With Quote

Old   March 10, 2001, 02:52
Default Re: grid aspect ratio and skew
  #3
John C. Chien
Guest
 
Posts: n/a
(1). There is no such thing as "a best solution" in the first place, because, then you have to define it or be able to measure it. (2). Even if you have test data, it is still difficult to determine which mesh will give a better solution. (3). So, in CFD, what we are interested in is the "mesh independent solution",which does not change as a function of the mesh used. (4). So, there is no requirement on the "quality" of a mesh, but there is a need to find the solution which will not change in terms of the mesh. (5). So, if you can obtain a converged solution by using a highly skewed mesh, then it is "a solution" and the next step to do is to find "the mesh independent solution" by refining the mesh I guess. (6). But if the mesh is rejected by the solver, then you got a big problem. In such cases, you need to get some help from the support engineer to see if you can improve your mesh.
  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
Cell skew Factor prapanj OpenFOAM Pre-Processing 7 August 25, 2013 16:44
stability of scheme due to skewness/aspect ratio zonexo Main CFD Forum 3 May 14, 2006 22:23
aspect ratio ditto CFX 7 May 11, 2003 12:19


All times are GMT -4. The time now is 10:17.