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CATIA/CAD ==> Gambit ==> FLUENT ????

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Old   May 14, 2007, 06:05
Default CATIA/CAD ==> Gambit ==> FLUENT ????
  #1
mimi
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hello Fluent users,

I was just wondering what is the starting point in generating a Geometry...CAD or Can we start in Gambit itself?

CATIA/CAD ==> Gambit ==> FLUENT ????

Thanks
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Old   May 14, 2007, 10:22
Default Re: CATIA/CAD ==> Gambit ==> FLUENT ????
  #2
Madhukar
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Hi

It depends on the complexity of the geometry. I mean if u have many complicated regions in the geometry...it is a bit easier to generate it using a CAD software. If u r working with a simple geometry, u can start with Gambit.

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Old   May 14, 2007, 10:29
Default Re: CATIA/CAD ==> Gambit ==> FLUENT ????
  #3
mimi
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Thanks for the answer....

Would you consider a standard aircraft wing with a control surface as a complicated geometry?
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Old   May 14, 2007, 13:31
Default Re: CATIA/CAD ==> Gambit ==> FLUENT ????
  #4
Madhukar
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Again it depends on ur expertise in Gambit. But according to me...it is a complicated one to generate in Gambit. Any geometry can be generated with ease using the CAD softwares.

Anyway there will be some problems while exporting the geometry to Gambit. But one can overcome those problems with the help of the tools provided in Gambit.

Regards
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Old   May 15, 2007, 04:05
Default Re: CATIA/CAD ==> Gambit ==> FLUENT ????
  #5
Michael B
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2D or 3D?

If in 2D I will import the points and line making up the wing profile into GAMBIT and mesh from there. I should work fine.I think you have to use the ICEM import for points and lines, but when you figure out how it works then it's quite easy.

IN 3D I will probably use a prof CAD software, which GAMBIT certainly is not!

DR. Flow Squad
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Old   May 15, 2007, 16:48
Default Re: CATIA/CAD ==> Gambit ==> FLUENT ????
  #6
Charles
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There is a simple and general rule here. If the geometry is not too complex, start in the CFD meshing program if you can. If it is relatively complex, i.e. typically with compound curved surfaces that are not simply bodies of revolution, you need more powerful geometry tools than any CFD meshing program can provide. HOWEVER. With very few exceptions, CAD-generated files from other people are very difficult to work with, typically containing overlapping edges and surfaces, holes, partially duplicated surfaces, symmetry planes that aren't, etc. When you get such a file it is sometimes better to just toss it away and start from scratch, it will take less time than to try and patch the existing geometry. If you work with nasty geometries, you need a good surfacing program (which is not necessarily the same as a good 3D solid modeller). I have lately been experimenting with MultiSurf from AeroHydro, and it has impressed me as a cost-effective and powerful surfacing program. It is also parametric, an unusual feature at the lower end of the price range.
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