Question: A flow field is characterized by the stream function [psi=x y^{2}+B x^{3}] What does the value of (B) need to be for the flow to

A flow field is characterized by the stream function

\[\psi=x y^{2}+B x^{3}\]

What does the value of $B$ need to be for the flow to be irrotational? For that value of $B$, determine the velocity potential $\phi$. Sketch the streamlines and potential lines.

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