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Which statement about the no-slip condition is TRUE?

  • A.It sets the pressure at the wall to zero
  • B.It applies only in turbulent flow
  • C.It applies only above a Reynolds number of one million
  • D.Fluid at the wall moves with the wall

Answer: D

No-slip holds in any continuum viscous flow, laminar or turbulent, at any Reynolds number. It is the boundary condition that creates the velocity gradient at the wall and hence the shear stress, and everything about the boundary layer follows from reconciling it with the free stream.

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