CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLOW-3D

ACCURATE MESHING

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 18, 2008, 06:14
Default ACCURATE MESHING
  #1
AMP
Guest
 
Posts: n/a
Does anyone have any useful knowledge for a perfect meshing in Flow3D? I do not understand cell size ratio and aspect ratio. thanks.
  Reply With Quote

Old   November 20, 2008, 00:53
Default Re: ACCURATE MESHING
  #2
michael barkhudarov
Guest
 
Posts: n/a
Well, a perfect mesh is cubic. This gives best accuracy and convergence rate. The aspect ratio is one and the adjacent cell size ratio is one too. In practice, of course, it may be too expensive to have such a mesh. For a non-uniform grid, the mesh generator attempt to smooth out the variation in cell sizes in a given coordinate direction, dx(i)/dx(i+1), but it cannot control the aspect ration (dx/dy, dx/dz and dy/dz), so the preprocessor reports these number for the user information. For example, an aspect ratio of > 3 may become problematic for convergence and/or accuracy, especially for flows with surface tension.
  Reply With Quote

Reply

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
[ANSYS Meshing] Migrating from GAMBIT to ANSYS Meshing David-CFD ANSYS Meshing & Geometry 1 April 1, 2011 05:22
Best Meshing scheme for Cylinder Nutrex Main CFD Forum 4 July 29, 2008 11:03
Singularity of grid?Volume meshing vs face meshing Ken Main CFD Forum 0 September 4, 2003 11:09
Volume Meshing & Face Meshing? singularity of grid ken FLUENT 0 September 4, 2003 11:08
Is conformal meshing really an advantage? Alvin Szeto Main CFD Forum 19 June 27, 2003 07:23


All times are GMT -4. The time now is 18:16.