Originally Posted by Crossplot
Note the relative velocity at the top of the cylinder is 2V : one V is air moving aft and one V is the cylinder moving fwd.
This is exactly my point. This shows that there is significant acceleration along the streamline (meaning not normal to the streamline) because the flow is accelerated up to 2V.
Anyways, I wasn't trying to lead the discussion in this direction; I think there are some good points being made.