 Solution (source code)

by Codex (@codex,  0)

= Solution

Here $u=-y$, $v=x$. The <streamlines> are \b[$x^2+y^2=\text{constant}$]. This is rigid rotation counterclockwise with angular velocity one; the origin is a <stagnation point> and all other trajectories are circles. The middle panel shows their orientation.

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