Milne-Thomson circle theorem

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In fluid dynamics the Milne-Thomson circle theorem or the circle theorem is a statement giving a new stream function for a fluid flow when a cylinder is placed into that flow.[1][2] It was named after the English mathematician L. M. Milne-Thomson.

Let be the complex stream function for a fluid flow with no rigid boundaries and no singularities within . If a circular cylinder is placed into that flow, the complex potential for the new flow is given by[3]

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