# Gaps in between surfaces

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

 May 28, 2006, 16:15 Gaps in between surfaces #1 Vidya Raja Guest   Posts: n/a Hi, the model that I'm trying to mesh has some small gaps (of the order of 1E-6) at the sites where two surfaces are being merged. I don't want any flow through those gaps. The gaps arose when I did the modeling in Pro/E. Will GAMBIT or Fluent detect those gaps and create problems? I'm wondering about this because I'm having problems meshing my geometry and GAMBIT does not specificaaly point out to this while giving errors. But during the analysis, will FLUENT detect gaps of such small magnitudes and give erroneous results? Thanks, Vidya

 May 28, 2006, 21:09 Re: Gaps in between surfaces #2 jiangxuxu Guest   Posts: n/a Hi, As far as I know, Gambit and Fluent merely detect the least distance of 0.000001. If the gap is smaller than 0.000001, Gambit and Fluent can't solve.

 May 28, 2006, 21:18 Re: Gaps in between surfaces #3 Vidya Raja Guest   Posts: n/a Hi, What do you mean by "Can't solve"? Please explain. The gap that I detect in Pro/E is about 6.4548*10E-6. So will I get wrong results from my FLUENT analyses? Will there be problems in meshing? I'm trying to fix the problem in Pro/E itself, but am unable to find a solution. If I go ahead with what I have right now, will GAMBIT and Fluent blow up? Thnaks, Vidya

 May 28, 2006, 21:31 Re: Gaps in between surfaces #4 jiangxuxu Guest   Posts: n/a Hi, 'can't solve' means them can't tell aparat(distinguish). 6.4548*10E-6 means 0.000064548. So Fluent and Gambit can compute.

 May 29, 2006, 08:30 Re: Gaps in between surfaces #5 Kasper Skriver Guest   Posts: n/a Ok, GAMBIT operates with an accuracy of 1E-06 in any kind of units. Let's say you have a cad(SAT) drawing with a gap below 1E-06, then GAMBIT will not see the gap - and you can continue with no mesh problems. If the gap is above 1E-06 you got a problem in GAMBIT and need to take care of the gap in some way. Cleanup could be a solution, I would zoom in and detect the error visualy and then create a new volume without gaps. I don't know if you can change the 1E-06 tolerance in GAMBIT or maybe in your cad program. /Kasper@DK

 May 29, 2006, 09:37 Re: Gaps in between surfaces #6 Vidya Raja Guest   Posts: n/a Thanks Jiangxuxu and Kasper. I'll try your suggestions and see how it works. Cheers, Vidya

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post CFD XUE FLUENT 3 March 18, 2015 04:28 Sam CFX 5 March 30, 2013 12:11 bigmoneylou ANSYS Meshing & Geometry 1 January 8, 2011 17:16 gija79 OpenFOAM 5 June 30, 2010 13:50 Chriss Main CFD Forum 1 May 6, 2008 15:18

All times are GMT -4. The time now is 10:14.