Point source
= Point source
A two-dimensional point source of strength $q$ has velocity potential $\phi=q\log r/(2\pi)$ and outward velocity $q\mathbf e_r/(2\pi r)$. Every closed contour enclosing it has volume flux $q$.
= Point source
A two-dimensional point source of strength $q$ has velocity potential $\phi=q\log r/(2\pi)$ and outward velocity $q\mathbf e_r/(2\pi r)$. Every closed contour enclosing it has volume flux $q$.