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normal component of velocity on a surface

A cylinder of radius a is placed in a uniform stream of speed U. Fluid is blown steadily outwards across the surface of the cylinder so that the normal component of velocity on the surface is V .

Find the velocity potential for the flow.

I know this means i have to find Ø but does V being the normal compnent of velocity on the surface mean than u.n=V? or that ∂Ø/∂r = V?

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normal component of velocity on a surface

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