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

2-D GAMBIT mesh

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 16, 2004, 02:22
Default 2-D GAMBIT mesh
  #1
yaron
Guest
 
Posts: n/a
shalom,

I'm trying to mesh a very simple model in gambit which I know his analitic solution : fully develop laminar flow between infinite parallel plates. when I solved it (2-D fluent) I got a different solution for every meshing. when I use very fine mesh I move away from the analitic solution (instead of congregate to it) what can be the problem ?

Thanks a lot for your help

yaron

  Reply With Quote

Old   June 17, 2004, 04:45
Default Re: 2-D GAMBIT mesh
  #2
ap
Guest
 
Posts: n/a
What kind of grid are you using? Usuall a structured uniform grid is better for such a simple case.

Which discretization scheme for convective terms in the transport equations did you choose? Try to increase its order to obtain better results.

Did you try to use FLUENT adaption function?

Hi

ap
  Reply With Quote

Old   June 18, 2004, 03:06
Default Re: 2-D GAMBIT mesh
  #3
yaron
Guest
 
Posts: n/a
ap shalom, I used uniform grid with different intervals without adapt. when I meshed with very fine intervals, the solution moved away from the analitic one - I tring to find an explanation for this result.

when I tried to use coarse mesh & fluent adapt in the test area - the solution was satisfactory.

I didn't understand your explanation on "convective terms in the transport equations" - what do you mean by that and how can I do it?

THANKS a lot for your help

yaron
  Reply With Quote

Old   June 18, 2004, 04:46
Default Re: 2-D GAMBIT mesh
  #4
ap
Guest
 
Posts: n/a
FLUENT offers different kinds of discretization schemes for the convective terms of the transport equations you're solving in your model,

You can find them in the Solve->Control->Solution menu of the FLUENT graphical interface.

A better accuracy can be obtained using a high order discretization scheme such Second Order Upwind or QUICK.

Also the pressure-velocity coupling algorithm is important. You can change it in the same window where you choose the discretization scheme.

Hi

ap
  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
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 22:11
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 19:10
Successive Mesh in Gambit ashish FLUENT 0 April 28, 2006 01:42
How to mesh a circle by Gambit? Zhengcai Ye FLUENT 5 March 24, 2006 02:04
[Commercial meshers] Mesh import from gambit Kaushik Balakrishnan (Balakrishnan) OpenFOAM Meshing & Mesh Conversion 5 April 21, 2005 14:42


All times are GMT -4. The time now is 09:13.