my nephew has 2 degrees in fluid dynamics, has won several awards for his designs and curently earns a 6 figure salary doing stuff he does with his degree, and that's what he's "basicly" described it as being

obviously i won't be able to post up 6 years of his studys any more than i could expand on what he was on about, or perhaps i am misquoting him in some small way, but he explained that you need to keep the smooth bits smooth as possible and design the turbulence to do what it needs to do away from the object you are trying to areo

if i can tempt him on here to explain then i will attempt to do so, but i don't think he'll be intrested