Gordon I. Ogilvie develops the fluid dynamics of astrophysical systems. His lecture notes connect conservation laws, rotation and magnetic fields with simplified models of stars and disks, while his accretion-disk teaching shows how boundary conditions constrain steady transport.[ref]
Lecture notes: Astrophysical fluid dynamics by Gordon I. Ogilvie. Scope of the astrophysical-fluid equations
[ref]A local stress prescription alone does not fix an entire disk solution: the mass supply, angular-momentum flux and conditions at its boundaries must be specified as well.
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