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-   -   CFD v.s wind tunnel in airfoil (http://www.cfd-online.com/Forums/cfx/21432-cfd-v-s-wind-tunnel-airfoil.html)

FRED CHEN July 12, 2005 02:59

CFD v.s wind tunnel in airfoil
 
I tried to compare CFD¡¦s results with wind tunnel test in pressure coefficient(Cp) for a developed airplane with a symmetric airfoil . At trailing edge, CFD proved that uppersurface¡¦s Cp and lowersurface¡¦s Cp close to each other ; but, the results of wind tunnel test speaded apart each other. The wind tunnel test of F-16 ran the same conclusion.Why? Thought W/T only had finit pressureholes , the curves couldn¡¦t diverge at trailing edge. According to Kutta condition, Cp curves of up/low surfaces at trailing edge must meet each other. Were W/T data incorrect ?


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