Simple airflow simulator?

Wind Tinkerer

Hello all,

Is there a straightforward 2D flow simulation software out there that would let me test some ideas for a home built wind turbine?

I'm not looking for aerospace engineering software that does supersonic flows and so on. Just a flow simulator that would let me input an arbitrary shape (like a 2D airfoil section) and visualize how air would flow around it at regular wind speeds.

I've found Java applets that do this for airfoil shapes but nothing so far that lets you input an arbitrarily shaped section instead of a 'classic' airfoil shape.

If anybody knows of such a tool for Windows please point me in the right direction.

Regards,

WT