Viscous and Resistive Effects on the MRI with a Net Toroidal Field (2009)
Simon, Jacob B., Hawley, John F.
Resistivity and viscosity have a significant role in establishing the energy levels in turbulence driven by the magnetorotational instability (MRI) in local astrophysical disk models. This study uses...
Transport of Large Scale Poloidal Flux in Black Hole Accretion (2009)
Beckwith, Kris, Hawley, John F., Krolik, Julian H.
We report on a global, three-dimensional GRMHD simulation of an accretion torus embedded in a large scale vertical magnetic field orbiting a Schwarzschild black hole. This simulation investigates how...
Direct calculation of the radiative efficiency of an accretion disk around a black hole (2008)
Noble, Scott C., Krolik, Julian H., Hawley, John F.
Numerical simulation of magnetohydrodynamic (MHD) turbulence makes it possible to study accretion dynamics in detail. However, special effort is required to connect inflow dynamics (dependent largely...
Simulations of Magnetorotational Turbulence with a Higher-Order Godunov Scheme (2008)
Simon, Jacob B., Hawley, John F., Beckwith, Kris
(abridged) We apply a second-order Godunov code, Athena, to studies of the magnetorotational instability using unstratified shearing box simulations with a uniform net vertical field and a...
Athena: A New Code for Astrophysical MHD (2008)
Stone, James M., Gardiner, Thomas A., Teuben, Peter, Hawley, John F., Simon, Jacob B.
A new code for astrophysical magnetohydrodynamics (MHD) is described. The code has been designed to be easily extensible for use with static and adaptive mesh refinement. It combines higher-order...
Global MHD Simulation of the Inner Accretion Disk in a Pseudo-Newtonian Potential (2007)
John F. Hawley, Julian H. Krolik
We present a detailed three dimensional magnetohydrodynamic (MHD) simulation describing the inner region of a disk accreting onto a black hole. To avoid the technical complications of general...
John F. Hawley, Steven A. Balbus, M. Stone
We present a global magnetohydrodynamic (MHD) three dimensional simulation of a nonradiative accretion flow originating in a pressure supported torus. The evolution is controlled by the...
John F. Hawley, Julian H. Krolik
New three dimensional magnetohydrodynamic simulations of accretion disk dynamics in a pseudo-Newtonian Paczy'nski-Wiita potential are presented. These have finer resolution in the inner disk...
Global MHD Simulations of Cylindrical Keplerian Disks (2007)
This paper presents a series of global three dimensional accretion disk simulations carried out in the cylindrical limit in which the vertical component of the gravitational field is neglected. The...
Beckwith, Kris, Hawley, John F., Krolik, Julian H.
Because the magneto-rotational instability is capable of exponentially amplifying weak preexisting magnetic fields, it might be hoped that the character of the magnetic field in accretion disks is...
The relationship between accretion disks and jets (2007)
John F. Hawley, Julian H. Krolik, Shigenobu Hirose
Recent results are reported from a program of large-scale numerical simulation of accretion and jet ows utilizing a code that computes 3-d MHD in full general relativity. We find that out ows arise...
An Exact, Three-Dimensional, Time-Dependent Wave Solution in Local Keplerian Flow (2006)
Balbus, Steven A., Hawley, John F.
We present an exact three-dimensional wave solution to the shearing sheet equations of motion. The existence of this solution argues against transient amplification as a route to turbulence in...
Light Curves from an MHD Simulation of a Black Hole Accretion Disk (2006)
Schnittman, Jeremy D., Krolik, Julian H., Hawley, John F.
We use a relativistic ray-tracing code to calculate the light curves observed from a global general relativistic magneto-hydrodynamic simulation of an accretion flow onto a Schwarzschild black hole....
Estimating the Radiative Efficiency of Magnetized Accretion Disks Around Black Holes (2006)
Beckwith, Kris, Hawley, John F., Krolik, Julian H.
Simulations of black hole accretion have shown that magnetic stresses are present near and inside the innermost stable circular orbit (ISCO). This finding suggests that such flows may be more...
Magnetically Driven Jets in the Kerr Metric (2005)
Hawley, John F., Krolik, Julian H.
We compute a series of three-dimensional general relativistic magnetohydrodynamic simulations of accretion flows in the Kerr metric to investigate the properties of the unbound outflows that result....
Krolik, Julian H., Hawley, John F., Hirose, Shigenobu
This paper continues the analysis of a set of general relativistic 3D MHD simulations of accreting tori in the Kerr metric with different black hole spins. We focus on bound matter inside the initial...
Magnetically Driven Accretion in the Kerr Metric III: Unbound Outflows (2004)
De Villiers, Jean-Pierre, Hawley, John F., Krolik, Julian H., Hirose, Shigenobu
We have carried out fully relativistic numerical simulations of accretion disks in the Kerr metric. In this paper we focus on the unbound outflows that emerge self-consistently from the accretion...
Magnetically Driven Accretion Flows in the Kerr Metric II: Structure of the Magnetic Field (2003)
Hirose, Shigenobu, Krolik, Julian H., De Villiers, Jean-Pierre, Hawley, John F.
We present a detailed analysis of the magnetic field structure found in general relativistic 3D MHD simulations of accreting tori in the Kerr metric with different black hole spins. Among the...
Magnetically Driven Accretion Flows in the Kerr Metric I: Models and Overall Structure (2003)
De Villiers, Jean-Pierre, Hawley, John F., Krolik, Julian H.
This is the first in a series of papers that investigate the properties of accretion flows in the Kerr metric through three-dimensional, general relativistic magnetohydrodynamic simulations of tori...
Global General Relativistic Magnetohydrodynamic Simulations of Accretion Tori (2003)
De Villiers, Jean-Pierre, Hawley, John F.
This paper presents an initial survey of the properties of accretion flows in the Kerr metric from three-dimensional, general relativistic magnetohydrodynamic simulations of accretion tori. We...
Gap Formation by Planets in Turbulent Protostellar Disks (2003)
Winters, Wayne F., Balbus, Steven A., Hawley, John F.
The processes of planet formation and migration depend intimately on the interaction between planetesimals and the gaseous disks in which they form. The formation of gaps in the disk can severely...
A Numerical Method for General Relativistic Magnetohydrodynamics (2002)
De Villiers, Jean-Pierre, Hawley, John F.
This paper describes the development and testing of a general relativistic magnetohydrodynamic (GRMHD) code to study ideal MHD in the fixed background of a Kerr black hole. The code is a direct...
Three-Dimensional Hydrodynamic Simulations of Accretion Tori in Kerr Spacetimes (2002)
De Villiers, Jean-Pierre, Hawley, John F.
This paper presents results of three-dimensional simulations of global hydrodynamic instabilities in black hole tori, extending earlier work by Hawley to Kerr spacetimes. This study probes a...
Numerical Simulations of MHD Turbulence in Accretion Disks (2002)
Balbus, Steven A., Hawley, John F.
We review numerical simulations of MHD turbulence. The last decade has witnessed fundamental advances both in the technical capabilities of direct numerical simulation, and in our understanding of...
The Dynamical Structure of Nonradiative Black Hole Accretion Flows (2002)
Hawley, John F., Balbus, Steven A.
We analyze three-dimensional magnetohydrodynamic (MHD) simulations of a nonradiative accretion flow around a black hole using a pseudo-Newtonian potential. The flow originates from a torus initially...
Where is the Inner Edge of an Accretion Disk Around a Black Hole? (2002)
Krolik, Julian H., Hawley, John F.
What is meant by the "inner edge" of an accretion disk around a black hole depends on the property that defines the edge. We discuss four such definitions using data from recent high-resolution...
On the Nature of Angular Momentum Transport in Nonradiative Accretion Flows (2002)
Balbus, Steven A., Hawley, John F.
The principles underlying a proposed class of black hole accretion models are examined. The flows are generally referred to as ``convection-dominated,'' and are characterized by inward transport of...
Hawley, John F., Krolik, Julian H.
New three dimensional magnetohydrodynamic simulations of accretion disk dynamics in a pseudo-Newtonian Paczynski-Wiita potential are presented. These have finer resolution in the inner disk than any...
A Magnetohydrodynamic Nonradiative Accretion Flow in Three Dimensions (2001)
Hawley, John F., Balbus, Steven A., Stone, James M.
We present a global magnetohydrodynamic (MHD) three dimensional simulation of a nonradiative accretion flow originating in a pressure supported torus. The evolution is controlled by the...
Global MHD Simulations of Cylindrical Keplerian Disks (2000)
This paper presents a series of global three dimensional accretion disk simulations carried out in the cylindrical limit in which the vertical component of the gravitational field is neglected. The...
Global MHD Simulation of the Inner Accretion Disk in a Pseudo-Newtonian Potential (2000)
Hawley, John F., Krolik, Julian H.
We present a detailed three dimensional magnetohydrodynamic (MHD) simulation describing the inner region of a disk accreting onto a black hole. To avoid the technical complications of general...
Fleming, Timothy P., Stone, James M., Hawley, John F.
We present three-dimensional magnetohydrodynamic simulations of the nonlinear evolution of the magnetorotational instability (MRI) with a non-zero Ohmic resistivity. The properties of the saturated...
Global Magnetohydrodynamical Simulations of Accretion Tori (1999)
Global time-dependent simulations provide a means to investigate time-dependent dynamic evolution in accretion disks. This paper seeks to extend previous local simulations by beginning a systematic...
Solar Nebula Magnetohydrodynamics (1999)
Balbus, Steven A., Hawley, John F.
The dynamical state of the solar nebula depends critically upon whether or not the gas is magnetically coupled. The presence of a subthermal field will cause laminar flow to break down into...
Local Hydrodynamic Stability of Accretion Disks (1998)
Hawley, John F., Balbus, Steven A., Winters, Wayne F.
We employ a variety of numerical simulations in the local shearing box system to investigate in greater depth the local hydrodynamic stability of Keplerian differential rotation. In particular we...
Nonlinear Evolution of the Magnetorotational Instability in Ion-Neutral Disks (1998)
Hawley, John F., Stone, James M.
We carry out three-dimensional magnetohydrodynamical simulations of the magnetorotational (Balbus-Hawley) instability in weakly-ionized plasmas. We adopt a formulation in which the ions and neutrals...
A test suite for magnetohydrodynamical simulations (1992)
James M. Stone, John F. Hawley, Charles R. Evans
Received: ; Accepted: We have drawn together in this paper a collection of magnetohydrodynamic (MHD) problems that will provide researchers who have interests in modeling MHD phenomena with a battery...
A Test Suite for Magnetohydrodynamical Simulations (1992)
James M. Stone, John F. Hawley, Charles R. Evans, Michael L. Norman
We have drawn together in this paper a collection of magnetohydrodynamic (MHD) problems that will provide researchers who have interests in modeling MHD phenomena with a battery of tests (a...
A Test Suite for Magnetohydrodynamical Simulations (1992)
James Stone, John F. Hawley, Charles R. Evans
We have drawn together in this paper a collection of magnetohydrodynamic (MHD) problems that will provide researchers who have interests in modeling MHD phenomena with a battery of tests (a...