# wing boundary condition

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 August 19, 2011, 18:13 wing boundary condition #1 Senior Member     Morteza Join Date: May 2010 Location: Iran,Islamic Republic of Posts: 161 Rep Power: 9 Sponsored Links 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

 August 19, 2011, 18:51 #2 Senior Member     Join Date: Jan 2011 Posts: 248 Blog Entries: 5 Rep Power: 10 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.

 August 19, 2011, 19:01 #3 Senior Member     Morteza Join Date: May 2010 Location: Iran,Islamic Republic of Posts: 161 Rep Power: 9 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???

 August 20, 2011, 18:26 #4 New Member   Ertan Karaismail Join Date: Apr 2009 Posts: 17 Rep Power: 10 For 1 wing sure.

August 21, 2011, 10:38
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Quote:
 Originally Posted by morteza08 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.

Truffaldino

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