CFD Online Logo CFD Online URL
Home > Forums > CFX


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

LinkBack Thread Tools Display Modes
Old   October 17, 2008, 03:31
Default Meshing
Jens Goldberg
Posts: n/a
Hello! I have problem concerning the mesh quality of my simulation. It consists of a small hydraulic turbine (aperture:380mm, length 500mm) which is situated in a channel (3000mmx3000mmx6000mm) and is only driven by the kinetic energy of the water. To simulate this application I have two parts the hydraulic turbine and the channel. After some time I have managed to mesh both with high quality meshs keeping the edge length ratio under 100 and the element volume ratio under 20. However if I combine both meshes in CFX-Pre and start the simulation the values of the maximum mesh expansion factor and minimum orthogonality angle are never in the range of a good quality mesh. Does somebody know how I can manage to get the minimum orthogonality angle and the maximum mesh expansion factor to stay in the range of a good mesh? Thank you for your help.


  Reply With Quote

Old   October 19, 2008, 19:15
Default Re: Meshing
Glenn Horrocks
Posts: n/a

Generating good quality meshes takes skill, practice and good software. Sounds like you should do a meshing training course.

Glenn Horrocks
  Reply With Quote

Old   October 20, 2008, 06:06
Default Re: Meshing
Rogerio Fernandes Brito
Posts: n/a
if u have circle boundaries, use an o-grid block to avoid bad angles and to increase the angle among the elements. Otherwise, you will have problems of convergence.

If u have a complex geometry, use tetra mesh.

Here, some tutorials to help you out.

Give a look on my hexa meshes examples:

  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
[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
Meshing locks workbench window. andy2o CFX 0 February 1, 2008 06:01
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

All times are GMT -4. The time now is 23:10.