Consider a long cylindrical pipe rotating about its long axis with an imcompressible fluid inside.
Why is the streamfunction constant at the boundary inside the pipe?
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I believe that this is a question for a physicist more than for a mathematician. – Gabriel Palau Nov 16 '21 at 15:07
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I think it's perfectly reasonable to imagine that a mathematician with a good knowledge of fluid dynamics can answer this. – dannyybb Nov 16 '21 at 15:08
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I agree with you – Gabriel Palau Nov 16 '21 at 15:10