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

Smooth Grid Error! Help

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 23, 2008, 10:04
Default Smooth Grid Error! Help
  #1
seasoul
Guest
 
Posts: n/a
Everybody! I am a newbie in Gambit and Fluent.

When I used smooth mesh option in Gamibt to improve my meshing, I got a negative volume, so I import the unsmoothen mesh into Fluent and use smooth/swap Grid option. After several smooth-swap steps, the supposed ever-decreasing "number faces swaped" begin to increase; at the same time, "Warning, non-positive volumes exist" comes out. Is "smooth" step always necessary? If so, is it necessary to get the "number faces swaped" decreased until it reaches zero?

Here is the error message, some are : ----------------------------------------------------------------------------------------------------------

Welcome to Fluent 6.3.26

Copyright 2006 Fluent Inc.

All Rights Reserved

Loading "D:\appl_sw\Fluent.Inc\fluent6.3.26\lib\fl_s1119.d mp" Done.

.....................

4 smoothing iterations complete

Number faces swapped: 619 Number faces visited: 5511

4 smoothing iterations complete

Number faces swapped: 358 Number faces visited: 4020

4 smoothing iterations complete

Number faces swapped: 179 Number faces visited: 3210

4 smoothing iterations complete

Number faces swapped: 89 Number faces visited: 2823

4 smoothing iterations complete

Number faces swapped: 52 Number faces visited: 2617

4 smoothing iterations complete

Number faces swapped: 34 Number faces visited: 2489

4 smoothing iterations complete

Number faces swapped: 21 Number faces visited: 2412

4 smoothing iterations complete

Number faces swapped: 12 Number faces visited: 2358

4 smoothing iterations complete

Number faces swapped: 15 Number faces visited: 2310

WARNING: non-positive volumes exist.

4 smoothing iterations complete

WARNING: non-positive volumes exist.

Number faces swapped: 9 Number faces visited: 2277

Interrupting... Done.

> Interrupting... Done. ------------------------------------------------------------------------------------------------------------

  Reply With Quote

Old   March 24, 2008, 11:56
Default Re: Smooth Grid Error! Help
  #2
devesh
Guest
 
Posts: n/a
Hi dear.......

as per my knowledge, If your geometry is very complex then you can use smooth the grid because during the meshing, by default it does smoothing of grid. After that If you want to go for smoothing option, then you go for "redomain" option in grid then u can smooth the grid or you can go for GRID adaptation option.

If I am wrong for your desired solution, then I am sorry. But above option may be helpful for you

Regards Devesh
  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
smooth DTF surface N.R. CFX 0 July 25, 2007 13:45
ICEM 10 smooth transition error Stephen CFX 3 March 13, 2007 10:23
smooth adaptive grid refinement Wouter Harteveld FLUENT 0 November 10, 2005 12:21
Smooth Grid Gernot FLUENT 0 August 19, 2005 16:00
smooth the joint? zhang junmei FLUENT 0 September 12, 2001 10:23


All times are GMT -4. The time now is 08:30.