Advection equation for solid body rotation

Edge velocities are stored in aux array (see setaux.f) with velocity specified by differencing the streamfunction defined in psi.f. The velocities are u = ψ_y, v =  − ψ_x.

Example [book/chap20/rotate] to accompany the book Finite Volume Methods for Hyperbolic Problems by R. J. LeVeque.

Converted to Clawpack 5.0 form in 2013.