184 citations · 668 across the 17 of their papers we have counts for
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Simple Waves in Ideal Radiation Hydrodynamics
Bryan M. Johnson
In the dynamic diffusion limit of radiation hydrodynamics, advection dominates diffusion; the latter primarily affects small scales and has negligible impact on the large scale flo…
Orbital Advection by Interpolation: A Fast and Accurate Numerical Scheme for Super-Fast MHD Flows
Bryan M. Johnson, Xiaoyue Guan, Charles F. Gammie
In numerical models of thin astrophysical disks that use an Eulerian scheme, gas orbits supersonically through a fixed grid. As a result the time step is sharply limited by the Cou…
Magnetohydrodynamic Shearing Waves
Bryan M. Johnson
I consider the nonaxisymmetric linear theory of a rotating, isothermal magnetohydrodynamic (MHD) shear flow. The analysis is performed in the shearing box, a local model of a thin…
The Effects of Thermal Conduction on Radiatively-Inefficient Accretion Flows
Bryan M. Johnson, Eliot Quataert
We quantify the effects of electron thermal conduction on the properties of hot accretion flows, under the assumption of spherical symmetry. Electron heat conduction is important f…
Vortices in Thin, Compressible, Unmagnetized Disks
Bryan M. Johnson, Charles F. Gammie
We consider the formation and evolution of vortices in a hydrodynamic shearing-sheet model. The evolution is done numerically using a version of the ZEUS code. Consistent with earl…
Turbulent Angular Momentum Transport in Weakly-Ionized Accretion Disks
Bryan Mark Johnson
Understanding the mechanism that drives accretion has been the primary challenge in accretion disk theory. Turbulence provides a natural means of dissipation and the removal of ang…