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Forces and Plane of Symmetry

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Old   February 7, 2005, 17:31
Default Forces and Plane of Symmetry
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Riaan
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Hello everyone,

I have a question as to the force reports of Fluent when I use the plane of symmetry.

I have a wing, which is cut along its centerline by a plane of symmetry.

When I do a force report, will Fluent give me the force over the whole wing (ie. both sides), or only the half I have in the flowfield?
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Old   February 7, 2005, 17:35
Default Re: Forces and Plane of Symmetry
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Riaan
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Sorry, I did a search on the forums and found that it will only report the force on half the body.

Can I get someone to verify this ?
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Old   February 7, 2005, 19:20
Default Re: Forces and Plane of Symmetry
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Jason
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That's correct, FLUENT only gives you the forces of what is present in the mesh(so only half the model when using symmetry BC). It's typical to deal with coefficients from the force report. If you use half of the reference area, this will give you the correct coefficients. (Coefficient = Force/(.5*Q*Aref), so since Fluent is reporting half of the force, using half of the area as your Aref gives you the full model coefficient).

Hope this helps, and goodluck, Jason
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Old   February 8, 2005, 06:02
Default Re: Forces and Plane of Symmetry
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Charles
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Riaan, as you guessed, it will be half body forces only, so make sure that you use half reference areas if you want coefficients. Just a word of warning (although it's probably not relevant for your problem), if you need lateral forces on a half body, you have to make sure that you use relative pressures, not absolute ....
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