# Surface and Volume Integrals

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 June 15, 2005, 19:55 Surface and Volume Integrals #1 philippe Guest   Posts: n/a Hi, I'm using the surface integral and volume integral reports in Fluent. I would like to know how does Fluent calculate the surface area and volume (for a 2D) mesh. The mesh I use is a 2D rectangle (0.0635 by 0.3302)m^2. When Fluent calculates the surface area I get a value of 19.6 m^2 which is impossible. How come? Also how does fluent come up with a volume intergral when the mesh is 2D only. Don't you need to have a 3D mesh to be able to calculate volumes? If you know anything about these questions please let me know?

 June 15, 2005, 21:49 Re: Surface and Volume Integrals #2 HK Guest   Posts: n/a Looks like that you have made an error in the Unit when importing the mesh. I thought in volume calculation, fluent use one unit length in the Z direction for a 2D case. HK

 June 15, 2005, 21:49 Re: Surface and Volume Integrals #3 HK Guest   Posts: n/a And you mesh is probably very coarse!! HK

 June 16, 2005, 12:01 Re: Surface and Volume Integrals #4 Philippe Salama Guest   Posts: n/a Hi, Thanks for the comments. I can I check the units of the mesh in gambit?

 June 19, 2005, 00:35 Re: Surface and Volume Integrals #5 Mehdi Ghoddosy Guest   Posts: n/a Dear Phlippe: How did you creat the rectangle. if you have used surface->plane for defining rect. it is not confined to the point that you have defined; but confined to model boundries. Regards

 June 22, 2005, 01:00 Re: Surface and Volume Integrals #6 Gamma23 Guest   Posts: n/a Model in constructed in GAMBIT is dimensionless. You'll have to remember what unit are going to use. By default, fluent use metre for the geometry length. If you build your model in milimeter unit, then you're require to scale it in fluent after you import the mesh. the scale mode can be done in Grid->Scale. Please take note that selecting the appropriate unit is justify by the existing unit that you have. Please avoid involve too much significant figures during you model up your case study in GAMBIT. There is a limitation for it and can cause inaccurate geometry information.

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