Consider an airfoil that is stationary in an infinite fluid.(a)Show that the circulation around a path away from the air foil but enclosing the stationary airfoil is zero.(b) At time zero, the airfoil starts to move with a constant speed U. Compute the circulation around the same path, still enclosing the moving airfoil. Is your result consistent with the Kelvins theorem?(c) The result obtained in (2b) is absurd since we know that the circulation around a moving airfoil is non zero. Resolve the paradox.
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