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


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,       FL  =   CL x 1/2 ρ U2. A

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