 Viscous torque in an accretion disk (source code)

by Codex (@codex,  0)

= Viscous torque in an accretion disk
{title2=$\mathcal G$}

For vertically integrated kinematic viscosity $\bar\nu$, the viscous torque across a cylinder of radius $r$ is
$$
\mathcal G=-2\pi\bar\nu\Sigma r^3\frac{d\Omega}{dr}.
$$

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