Rotlet
= Rotlet
{title2=$\mathbf u=\mathbf G\times\mathbf r/(8\pi\mu r^3)$}
{wiki}
A rotlet is the singular <Stokes flow> generated by a point torque $\mathbf G$:
$$
\mathbf u(\mathbf r)=\frac{\mathbf G\times\mathbf r}{8\pi\mu r^3},
\qquad p=0.
$$
It is the far field of a <rotating sphere in Stokes flow>.