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Old   August 19, 2011, 18:13
Default wing boundary condition
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Hi All
I am modeling a wing for simulating in fluent
i have two questions?
1: Whole wing must be located in a meshed volume or not? I mean wing tip and wing root should be boundary faces or they are located in a bigger meshed volume

2: if wing tip and root must be boundary faces which boundary condition is most appropriate for them?



thanks
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Old   August 19, 2011, 18:51
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wing surface, including tip should be no-slip. As for root, usually people attach a half of fuselage to it and put symmetry bc on the symmetry plane: for simplicity you could put symmetry bc in the root plane if you do not have fuselage.
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Old   August 19, 2011, 19:01
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dear truffaldino
Thanks for yout quick reply
if i choose the symmetry boundary condition for root...
Are the cl and cd for 1 wing or for two wings..
I mean i have to consider half of them for my wing???
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Old   August 20, 2011, 18:26
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For 1 wing sure.
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Old   August 21, 2011, 10:38
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Quote:
Originally Posted by morteza08 View Post
dear truffaldino
Thanks for yout quick reply
if i choose the symmetry boundary condition for root...
Are the cl and cd for 1 wing or for two wings..
I mean i have to consider half of them for my wing???
For symmetric flow cl and cd are the same for half-wing and for whole (two-piece) wing.
I mean the following: if you simulate only half of wing (i.e. one wing with symmetry bc at root), your reference must be planform area of that half.

Than cl and cd will be the same as those of the whole wing with twice bigger reference area.

So, if you are using FLUENT with symmetry bc at the root plane, set the reference area as area of planform of that single wing and you will get proper cl and cd.

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