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Magnus Effect

                           

               (a) Flow Past a Non-Rotating Cylinder               (b) Flow Past a Rotating Cylinder
                             (Ideal fluid flow)

            

(c) Single Stagnation Point                         (d) Stagnation Point
            (Vc = 2V0)                                           away from the cylinder
A lift force is produced by a rotating clinder in a uniform flow, this phenomenon is known as Magnus effect.

Magnus effect is explained for various conditions by following figures of stagnation points. Resulting streamline pattern round such a rotating cylinder is shown in.

 Drag force,     FD  =  CD. 1/2 ρ U2 x A

 Lift Force,       F =   CL x 1/2 ρ U2. A

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