"Simple" and "wind tunnel" are pretty much mutually exclusive. There are some programs that will do a 2d analysis based on a 2d image, but that is not the same thing as a wind tunnel. You really need to be working with 3d models to have meaningful results.
openfoam is what I have considered looking at in the past. Not simple though.
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WINDMILLS DO NOT WORK THAT WAY!!!
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