Novak – “Hydrodynamic simulations of black hole fueling and feedback”
“Nuclear physics”: not analytic, non-local, inhomogeneous, coupled at vastly different length scales, energy generation affects fueling
Axi-symmetric simulations: 2.5pc to 250kpc scales, run for Gyrs. See his papers in the last few years. Physically rich model (RT, feedback, dust models & opacity, etc.)
Increasing the dimensionality of the simulations smoothes out the accretion rate. Why? Turbulent cascade behaviors in 2D (amplified into blobs -> big accretion events) vs. 3D (cascades into smaller blobs -> smooth accretion).
Working on a subgrid model for AGN: time-averaged behavior as a function of smoothing radius (so it can be applied to various sim. setups). Inside ~200 pc, accretion rates don’t depend on density, sound speed, or BH mass! Outside, the sound speed dependence goes negative (csβ, β < 0). Outside 1 kpc, increasing dependence on density (ρα, α > 0).
Nagamine – “Gas accretion onto a supermassive black hole: a step to model AGN feedback”
Bridging the gap between <pc and ~kpc simulations.