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An inviscid flow is one in which

  • A.Heat transfer is assumed to dominate
  • B.Viscosity is neglected
  • C.The density is assumed constant
  • D.The flow is assumed to be turbulent

Answer: B

Setting viscosity to zero removes the boundary layer and skin friction, which makes the equations far easier and is a good approximation outside the thin viscous region. Taken literally it also predicts no drag at all, which is d'Alembert's paradox.

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