In practical aerodynamics, the displacement thickness essentially modifies the shape of a body immersed in a fluid to allow an inviscid solution.
2.
Displacement Thickness is an alternative definition stating that the boundary layer represents a deficit in mass flow compared to inviscid flow with slip at the wall.
3.
The "'displacement thickness "', "'? * "'or "'? 1 "'is the distance by which a surface would have to be moved in the direction perpendicular to its normal vector away from the reference plane in an inviscid fluid stream of velocity u _ 0 to give the same flow rate as occurs between the surface and the reference plane in a real fluid.
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