CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

basic of mesh refinement

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 19, 2007, 05:28
Default basic of mesh refinement
Posts: n/a

I am consider my self as novice in this area and I would like to ask about mesh refinement. First I would like to explain steps which I have done so far :

- I create my 3d model using proe and export it to icem in iges format.

-I did some cleaning and assigned my parts.

-I create my mesh as unstructured tetrahedral and this are the things I did while preparing my mesh :

a. In Global Mesh Setup, I did not change anything. b. In mesh sizes for parts, I only assigned the individual max size for each part that I have. My understanding is the smaller the maximum size, the finer the mesh (I am not sure about this). The biggest is 8 and smallest is 0.5 c. I do nothing for surface mesh setup as well for curve mesh setup d. Last thing is I compute my mesh

- After finish with computing the mesh, I choose edit mesh and activate smooth mesh globally. There I choose my smoothing iterations to be 6 and up to value 0.8 (the bigger the better isn't it?)

- After applying the smooths elements globally I choose check mesh, I got no error message except for unconnected vertices.

- And that will be the end of my step

The problem happens when I run in fluent, my residual seems to be fluctuating and my supervisor advise me to refine my mesh, but I have no idea what to do? and how to check my mesh.

Any suggestions?

  Reply With Quote

Old   June 19, 2007, 06:00
Default Re: basic of mesh refinement
Posts: n/a
I am not sure that your problems are due to mesh. If you have any problems with convergence, you can try to refine that, but probably a change of the timescale will be more appropriate.

How much you can rifine your mesh depends on your computational resources and the time you are disposed to spend to obtain a solution.


  Reply With Quote

Old   June 19, 2007, 07:18
Default Re: basic of mesh refinement
Posts: n/a
Thanks for the response. What do you mean by time scale? How can I change that value?
  Reply With Quote

Old   June 19, 2007, 08:14
Default Re: basic of mesh refinement
Posts: n/a
I don't know FLUENT in details. In CFX (this is CFX forum) the timescale is the integration time for the Navier-Stokes equations and you can change it on the solver control panel. I don't know if there is an equivalent parameter in FLUENT, but i suppose there is. Try asking to fluent users in the fluent user forum.
  Reply With Quote

Old   June 19, 2007, 12:21
Default Re: basic of mesh refinement
Posts: n/a
Thanks, I 'll check in fluent.

Anyway is there any suggestion to refine my mesh? What about my mesh size which I've given? Is it sufficient, or is there any step that I missed during mesh generation?

  Reply With Quote


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
Mesh motion with Translation & Rotation Doginal CFX 2 January 12, 2014 06:21
[snappyHexMesh] non-smooth mesh Svensson OpenFOAM Meshing & Mesh Conversion 11 January 18, 2012 09:13
[snappyHexMesh] I wonder, how do I mesh a car? MadsR OpenFOAM Meshing & Mesh Conversion 0 May 2, 2011 15:39
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10
Mesh refinement and the errors. Korsh Mik CFX 0 January 11, 2006 07:07

All times are GMT -4. The time now is 16:23.