We present a study of a new kinematic theory of unsteady separation. The approach allows for the determination of both the location and orientation of separation in a twodimensional unsteady fluid flow based solely upon surface shear-stress and pressure measurements. The experimental results obtained for a rotor-oscillator flow are compared with complementary numerical simulations. It is clearly identified that in both periodic and certain aperiodic unsteady fluid flows, separation does not occur at a point of instantaneous zero skin-friction, but rather at a point where the time-averaged skin-friction is zero.
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