Reference Values
hi. i'm simulatig a 2D( 2ddp double precision solver) airfoil (naca0021). the chord lengh (was made up using gambit) is 0.14m. my problem is to correct set up the "Reference Values" to match the results with the published one (cd=0,019 cl=0,85)
A=0.14 cd=0,135-----cl=0,85 A=1 cd=0,019-----cl=0,1119 as you can see, if i set the reference area = 0.14, i have a correct solution for lift, but wrong with the drag. whereas i set the reference area =1, i have a good drag, but a wrong lift what its wrong here? whats i'm doing wrong? it is not possible to solve a problem with a chord lenght that is not = 1? i thought i would not be a big problem to change it to 14cm can anyone help me? thanks in advance |
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For airfoils, typically the reference area is the planform area which is sometimes equivalent to the chord length, keeping in mind this also changes with angle of attack. |
agree with that (the references its the chord lengh).
but the problem here is that (lets say) with the chord lengh as reference area in the reference value pannel, i do have a good result for cl, but the cd its wrong. can you get the point here? |
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Out of interest, did you managed to solve the problem?
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