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D'Alembert's paradox states that a body in steady, inviscid, incompressible flow experiences

  • A.Drag equal to the lift force
  • B.Drag independent of the body shape
  • C.No drag at all
  • D.Infinite drag at any speed

Answer: C

Ideal-flow theory predicts that pressure recovered at the rear exactly cancels that at the front, giving zero net drag, which plainly contradicts experiment. The resolution is viscosity, whose boundary layer and separation destroy the symmetry.

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