Pressuredrag
dominates
skin Friction
dominates
streamline US Pressure drag TypicalDragCoest
Bluff
When object is not streamlined the flow in the wake is slower
creating pressure difference
Thenature of the wake dominates the flow physics
ny a
no
Flow Separation Boundary layer
Favourable pressure gradient accelerating
Adverse pressuregradient decellaration
Pressure dominated reversed
Wakedriven by the boundarylayer and flow
regime Renumber