The displacement thickness of a boundary layer is

- 1
  
  the distance to the point where (v/V)= 0.99
- 2
  
  the distance where the velocity 'v' is equal to the shear velocity V*, that is, where v=V*
- 3
  
  the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation
- 4
  
  one half the actual thickness of the boundary layer

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