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A.T.
#2
Aug22-11, 10:35 AM
P: 4,053
For arbitrary shapes you need CFD. Free but not simple to use package:
http://www.openfoam.com/

For airfoils:
http://web.mit.edu/drela/Public/web/xfoil/
http://www.mh-aerotools.de/airfoils/javafoil.htm