Athena: A New Code for Astrophysical MHD

Abstract

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 Godunov methods with the constrained transport (CT) technique to enforce the divergence-free constraint on the magnetic field. Discretization is based on cell-centered volume-averages for mass, momentum, and energy, and face-centered area-averages for the magnetic field. Novel features of the algorithm include (1) a consistent framework for computing the time- and edge-averaged electric fields used by CT to evolve the magnetic field from the time- and area-averaged Godunov fluxes, (2) the extension to MHD of spatial reconstruction schemes that involve a dimensionally-split time advance, and (3) the extension to MHD of two different dimensionally-unsplit integration methods. Implementation of the algorithm in both C and Fortran95 is detailed, including strategies for parallelization using domain decomposition. Results from a test suite which includes problems in one-, two-, and three-dimensions for both hydrodynamics and MHD are given, not only to demonstrate the fidelity of the algorithms, but also to enable comparisons to other methods. The source code is freely available for download on the web.

61 pages, 36 figures. accepted by ApJS

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• Numerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources
• Testing the Prediction of Fuzzy Dark Matter Theory in the Milky Way Center
• Global 3D Radiation Hydrodynamic Simulations of Proto-Jupiter's Convective Envelope
• An Entropy Stable Nodal Discontinuous Galerkin Method for the resistive MHD Equations. Part II: Subcell Finite Volume Shock Capturing
• As a matter of dynamical range -- scale dependent energy dynamics in MHD turbulence
• Numerical code for multi-component galaxies: from N-body to chemistry and magnetic fields
• Self-consistent modelling of line-driven hot-star winds with Monte Carlo radiation hydrodynamics
• Spritz: a new fully general-relativistic magnetohydrodynamic code
• Two-dimensional numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
• Radio Spectroscopic Imaging of a Solar Flare Termination Shock: Split-Band Feature as Evidence for Shock Compression
• Quokka: A code for two-moment AMR radiation hydrodynamics on GPUs
• The Efficiency of Second-Order Fermi Acceleration by Weakly Compressible MHD Turbulence
• Collisionless Stellar Hydrodynamics as an Efficient Alternative to N-body Methods
• Global MHD Simulations of Accretion Disks in Cataclysmic Variables (CVs): II The Relative Importance of MRI and Spiral Shocks
• Local simulations of MRI turbulence with meshless methods
• Galactic Spiral Shocks with Thermal Instability in Vertically Stratified Galactic Disks
• Light curves of tidal disruption events in active galactic nuclei
• Simulating Supersonic Turbulence in Magnetized Molecular Clouds
• Ambipolar Diffusion in Action: Transient C shock Structure and Prestellar Core Formation
• Synthetic Observations of 21cm HI Line Profiles from Inhomogeneous Turbulent Interstellar HI Gas with Magnetic Field
• Star Formation in Nuclear Rings with the TIGRESS Framework
• The Effect of Anisotropic Conduction on the Thermal Instability in the Interstellar Medium
• Cloud Properties and Correlations with Star Formation in Numerical Simulations of the Three-Phase ISM
• A 60-kpc Galactic Wind Cone in NGC 3079
• Planetesimal Initial Mass Functions following Diffusion Regulated Gravitational Collapse
• Dust dynamics in 2D gravito-turbulent disks
• The 3D MHD code GOEMHD3 for large-Reynolds-number astrophysical plasmas
• Temperature Fluctuations driven by Magnetorotational Instability in Protoplanetary Disks
• FISH: A 3D parallel MHD code for astrophysical applications
• On Hydromagnetic Stresses in Accretion Disk Boundary Layers
• Angular Momenta, Magnetization, and Accretion of Protostellar Cores
• Aiolos- A multi-purpose 1-D hydrodynamics code for planetary atmospheres
• A multifiltering study of turbulence in a large sample of simulated galaxy clusters
• Magnetic field evolution and reversals in spiral galaxies
• Particle Diffusion and Acceleration in Magnetorotational Instability Turbulence
• MACER improved: AGN feedback computed in rotating early-type galaxies at high resolution
• Better Together: The Complex Interplay Between Radiative Cooling and Magnetic Draping
• A model of Mira's cometary head/tail entering the Local Bubble
• WOMBAT: A Scalable and High Performance Astrophysical MHD Code
• Angular Momentum Transport by Acoustic Modes Generated in the Boundary Layer II: MHD Simulations
• On the efficient acceleration of clouds in active galactic nuclei
• Extension of the sub-grid-scale gradient model for compressible magnetohydrodynamics turbulent instabilities
• Kinetic-MHD simulations of gyroresonance instability driven by CR pressure anisotropy
• Suppressed heat conductivity in the intracluster medium: implications for the magneto-thermal instability
• Causal, stable first-order viscous relativistic hydrodynamics with ideal gas microphysics
• Turbulent Dust-trapping Rings as Efficient Sites for Planetesimal Formation
• High-frequency spicule oscillations generated via mode conversion
• Resilience of Planetesimal Formation in Weakly-Reinforced Pressure Bumps
• Cooling driven coagulation
• From Piz Daint to the Stars: Simulation of Stellar Mergers using High-Level Abstractions
• A Vector Potential implementation for Smoothed Particle Magnetohydrodynamics
• Alone on a wide wide sea. The origin of SECCO 1, an isolated star-forming gas cloud in the Virgo cluster
• Towards First-principle Characterization of Cosmic-ray Transport Coefficients from Multi-scale Kinetic Simulations
• Primordial Obliquities of Brown Dwarfs and Super-Jupiters from Fragmenting Gravito-Turbulent Discs
• The Early Stage of Molecular Cloud Formation by Compression of Two-phase Atomic Gases
• Mass, Morphing, Metallicities: The Evolution of Infalling High Velocity Clouds
• The Kelvin-Helmholtz instability and smoothed particle hydrodynamics
• The HBI in a quasi-global model of the intracluster medium
• Braginskii viscosity on an unstructured, moving mesh accelerated with super-time-stepping
• Impact of magneto-rotational instability on grain growth in protoplanetary disks: I. Relevant turbulence properties
• Dense Regions in Supersonic Isothermal Turbulence
• Spreading layers in accreting objects: role of acoustic waves for angular momentum transport, mixing and thermodynamics
• Cosmological Simulations using GCMHD+
• Dynamical modulation of solar flare electron acceleration due to plasmoid-shock interactions in the looptop region
• Chemical enrichment of the pre-solar cloud by supernova dust grains
• Annihilation of Magnetic Islands at the Top of Solar Flare Loops
• Multi-scale Pressure-balanced Structures in Three-dimensional Magnetohydrodynamic Turbulence
• Quantifying energetics and dissipation in magnetohydrodynamic turbulence
• Non-ideal magnetohydrodynamics on a moving mesh
• Effects of Varying Mass Inflows on Star Formation in Nuclear Rings of Barred Galaxies
• The Effects of Magnetic Fields on the Dynamics of Radiation Pressure Dominated Massive Star Envelopes
• Effects of Grain Alignment Efficiency on Synthetic Dust Polarization Observations of Molecular Clouds
• Hydrodynamic Winds From Twin-Star Binaries
• A high-order weighted finite difference scheme with a multi-state approximate Riemann solver for divergence-free magnetohydrodynamic simulations
• Nonlinear reflection process of linearly-polarized, broadband Alfvén waves in the fast solar wind
• Dependence of the saturation level of magnetorotational instability on gas pressure and magnetic Prandtl number
• Instability of Evaporation Fronts in the Interstellar Medium
• Fantastic Striations and Where to Find Them: Origin of Magnetically Aligned Striations in Interstellar Clouds
• Two-dimensional modeling of density and thermal structure of dense circumstellar outflowing disks
• 2D Relativistic MHD Simulations of the Kruskal-Schwarzschild Instability in a Relativistic Striped Wind
• Oblique Shock Breakout in Supernovae and Gamma-Ray Bursts: II. Numerical Solutions For Non-Relativistic Pattern Speeds
• Dynamics Near the Inner Dead-Zone Edges in a Proprotoplanetary Disk
• Accretion of Magnetized Stellar Winds in the Galactic Centre: Implications for Sgr A* and PSR J1745-2900
• Tracing Magnetic Field with Synchrotron Polarization Gradients: Parameter Study
• Newtonian CAFE: a new ideal MHD code to study the solar atmosphere
• A Moving Mesh Hydrodynamic Solver for ChaNGa
• Modeling of interactions between supernovae ejecta and aspherical circumstellar environments
• PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (II)
• Improved Performances in Subsonic Flows of an SPH Scheme with Gradients Estimated using an Integral Approach
• A Very Fast And Angular Momentum Conserving Tree Code
• The Piecewise Cubic Method (PCM) for Computational Fluid Dynamics
• Magnetically Arrested Circumbinary Accretion Flows
• Scaling Relations of Starburst-Driven Galactic Winds
• Parsec-scale obscuring accretion disk with large scale magnetic field in AGN
• A finite-volume scheme for modeling compressible magnetohydrodynamic flows at low Mach numbers in stellar interiors
• On the Detection Potential of Blazar Flares for Current Neutrino Telescopes
• A new framework for magnetohydrodynamic simulations with anisotropic pressure
• As a matter of force - Systematic biases in idealized turbulence simulations
• The Magnetohydrodynamic-Particle-In-Cell Module in Athena++: Implementation and Code Tests
• Ram pressure stripping of the multiphase ISM: a detailed view from TIGRESS simulations
• On characterizing nonlocality and anisotropy for the magnetorotational instability
• On the Piecewise Parabolic Method for Compressible Flow with Stellar Equations of State
• PION: Simulating bow shocks and circumstellar nebulae
• An Extension of the Athena++ Framework for Fully Conservative Self-Gravitating Hydrodynamics
• Interface instabilities in hydrodynamic relativistic jets
• Cosmic Ray Transport in the Ionized and Neutral ISM: MHD-PIC Simulations and Effective Fluid Treatments
• Radiative Turbulent Mixing Layers and the Survival of Magellanic Debris
• A general-purpose timestep criterion for simulations with gravity
• A Multistate Low-dissipation Advection Upstream Splitting Method for Ideal Magnetohydrodynamics
• Simulating magnetized neutron stars with discontinuous Galerkin methods
• Rapid formation of black holes in galaxies: a self-limiting growth mechanism
• A sub-grid model for the growth of dust particles in hydrodynamical simulations of protoplanetary disks
• GenASiS: General Astrophysical Simulation System. I. Refinable Mesh and Nonrelativistic Hydrodynamics
• Radiation pressure in galactic disks: stability, turbulence, and winds in the single-scattering limit
• Vortex survival in 3D self-gravitating accretion discs
• Phurbas: An Adaptive, Lagrangian, Meshless, Magnetohydrodynamics Code. I. Algorithm
• Streaming instability on different scales. I. Planetesimal mass distribution variability
• Effects of Magnetic Fields on Gas Dynamics and Star Formation in Nuclear Rings
• Sensitivity of the Magnetorotational Instability to the shear parameter in stratified simulations
• Chemo-dynamical simulations of dwarf galaxy evolution
• Turbulence, Transport and Waves in Ohmic Dead Zones
• Thermal Stability in Turbulently Mixed Accretion Discs
• Cosmic-ray ionization rate in protoplanetary disks with sheared magnetic fields
• Turbulent magnetic fields in merging clusters: A case study of Abell 2146
• Radio-loud AGN variability from three-dimensional propagating relativistic jets
• Wiggle Instability of Galactic Spiral Shocks: Effects of Magnetic Fields
• Planetesimal formation via the streaming instability with multiple grain sizes
• APSARA: A multi-dimensional unsplit fourth-order explicit Eulerian hydrodynamics code for arbitrary curvilinear grids
• SPMHD simulations of Structure Formation
• Entropy-Stable Gauss Collocation Methods for Ideal Magneto-Hydrodynamics
• The Role of Gravity in Producing Power-Law Mass Functions
• Magnetohydrodynamics with GAMER
• A high-order shock capturing discontinuous Galerkin-finite-difference hybrid method for GRMHD
• On Helium Mixing in Quasi-global Simulations of the Intracluster Medium
• Fast Shocks From Magnetic Reconnection Outflows
• Three-dimensional magnetic fields of molecular clouds
• Phurbas: An Adaptive, Lagrangian, Meshless, Magnetohydrodynamics Code. II. Implementation and Tests
• The effect of the streaming instability on protoplanetary disc emission at millimetre wavelengths
• AZEuS: An Adaptive Zone Eulerian Scheme for Computational MHD
• MRI-driven angular momentum transport in protoplanetary disks
• Smoothed particle magnetohydrodynamics with the geometric density average force expression
• As A Matter of State: The role of thermodynamics in magnetohydrodynamic turbulence
• HOW-MHD: A High-Order WENO-Based Magnetohydrodynamic Code with a High-Order Constrained Transport Algorithm for Astrophysical Applications
• Intermittency of Fast MHD Modes and Regions of Anomalous Gradient Orientation in Low-beta Plasmas
• Simulating cold shear flows on a moving mesh
• A Global Non-Hydrostatic Atmospheric Model with a Mass and Energy Conserving Vertically-Implicit-Correction (VIC) Scheme
• Cinematic Visualization of Multiresolution Data: Ytini for Adaptive Mesh Refinement in Houdini
• Gas stripping and mixing in galaxy clusters: A numerical comparison study
• Stability of stagnation via an expanding accretion shock wave
• Numerical MHD Codes for Modeling Astrophysical Flows
• Mesh-free hydrodynamics in PKDGRAV3 for galaxy formation simulations
• The Dynamics of Rayleigh-Taylor Stable and Unstable Contact Discontinuities with Anisotropic Thermal Conduction
• Deformation of Optics for Photon Monte Carlo Simulations
• Local Simulations of Instabilities Driven by Composition Gradients in the ICM
• Structure, Dynamics and Deuterium Fractionation of Massive Pre-Stellar Cores
• Electron Heating and Saturation of Self-regulating Magnetorotational Instability in Protoplanetary Disks
• cuHARM : a new GPU accelerated GR-MHD code and its application to ADAF disks
• MAGNUS: A new resistive MHD code with heat flow terms
• AsterX: a new open-source GPU-accelerated GRMHD code for dynamical spacetimes
• Role of magnetic field strength and numerical resolution in simulations of the heat-flux driven buoyancy instability
• High-order Discontinuous Galerkin hydrodynamics with sub-cell shock capturing on GPUs
• Linear dust polarization during the embedded phase of protostar formation
• Slurm: fluid particle-in-cell code for plasma modeling
• On the limitations of magneto-frictional relaxation
• Eccentricity Growth of Massive Planets inside Cavities of Protoplanetary Discs
• A Spatial-Temporal asymptotic preserving scheme for radiation magnetohydrodynamics in the equilibrium and non-equilibrium diffusion limit
• WVTICs -- SPH initial conditions for everyone
• Extremum-Preserving Limiters for MUSCL and PPM
• Adding a Suite of Chemical Abundances to the MACER Code for the Evolution of Massive Elliptical Galaxies
• A Vorticity-Preserving Hydrodynamical Scheme for Modeling Accretion Disk Flows
• Magnetic Energy Conversion in MHD: Curvature Relaxation and Perpendicular Expansion of Magnetic Fields
• Effective dust growth in laminar circumplanetary discs with magnetic wind-driven accretion
• 2-D Magnetohydrodynamic Simulations of Induced Plasma Dynamics in the Near-Core Region of a Galaxy Cluster
• A new ionisation network and radiation transport module in PLUTO
• Exponential Integrators for Resistive Magnetohydrodynamics: Matrix-free Leja Interpolation and Efficient Adaptive Time Stepping
• Non-equilibrium Ionization Modeling of Petschek-type Shocks in Reconnecting Current Sheets in Solar Eruptions
• Multi-scale and multi-domain computational astrophysics
• Simulations of Tidal Disruption Events
• Long-Term Evolution of Decaying MHD Turbulence in the Multiphase ISM
• The Transition of Polarized Dust Thermal Emission from the Protostellar Envelope to the Disk Scale
• Special Relativistic Hydrodynamics with CRONOS
• The fast and the slow axonal transport: a unified approach based on cargo and molecular motors coupled dynamics
• Two-dimensional modeling of the tearing-mode-governed magnetic reconnection in the large-scale current sheet above the two-ribbon flare
• A fast dynamic smooth adaptive meshing scheme with applications to compressible flow
• A single-step third-order temporal discretization with Jacobian-free and Hessian-free formulations for finite difference methods
• Formation of dust filaments in the diffuse envelopes of molecular clouds
• PIERNIK mhd code - a multi-fluid, non-ideal extension of the relaxing-TVD scheme (III)
• The Limited Role of the Streaming Instability During Moon and Exomoon Formation
• Compression Acceleration of Protons and Heavier Ions at the Heliospheric Current Sheet
• Theoretical X-ray light curves of young SNe II: the example of SN 2013ej
• Fast Magnetic Reconnection induced by Resistivity Gradients in 2D Magnetohydrodynamics
• Multidimensional upwind hydrodynamics on unstructured meshes using Graphics Processing Units I. Two-dimensional uniform meshes
• WENO-Wombat: Scalable Fifth-Order Constrained-Transport Magnetohydrodynamics for Astrophysical Applications
• Spectral Methods for Time-Dependent Studies of Accretion Flows. III. Three-Dimensional, Self-gravitating, Magnetohydrodynamic Disks
• Massive Galaxies Impede Massive Outflows
• The time step constraint in radiation hydrodynamics
• Dust Coagulation in the Vicinity of a Gap-Opening Jupiter-Mass Planet
• Differentiable Cosmological Hydrodynamics for Field-Level Inference and High Dimensional Parameter Constraints
• A Discontinuous Galerkin Solver in the FLASH Multi-Physics Framework
• Self-gravity in thin-disc simulations of protoplanetary discs: smoothing length rectified and generalised to bi-fluids
• Prograde spin-up during gravitational collapse
• Directionally Unsplit Hydrodynamic Schemes with Hybrid MPI/OpenMP/GPU Parallelization in AMR
• Cloud Formation by Supernova Implosion
• Global MRI with Braginskii viscosity in a galactic profile
• Standing solitary waves as transitions to spiral structures in gravitationally unstable accretion disks
• Effects of Strong Magnetic Fields on Photoionised Clouds
• Future Simulations of Tidal Disruption Events
• Energy-consistent finite difference schemes for compressible hydrodynamics and magnetohydrodynamics using nonlinear filtering
• Numerical Simulation of Solar Magnetic Flux Emergence Using the AMR--CESE--MHD Code
• Supersonic turbulence simulations with GPU-based high-order Discontinuous Galerkin hydrodynamics
• Meshless Methods for Magnetohydrodynamics with Vector Potential
• Relative Alignment Between Magnetic Fields and Molecular Gas Structure in Molecular Clouds
• Development and Application of Numerical Techniques for General-Relativistic Magnetohydrodynamics Simulations of Black Hole Accretion
• Turbulent magnetic field amplification from spiral SASI modes in core-collapse supernovae
• Simulating a pulsed power-driven plasma with ideal MHD
• Dust growth in molecular cloud envelopes: a numerical approach
• Digital Infrastructure in Astrophysics
• Three-dimensional simulations of accretion flow in the progenitor of Tycho's supernova
• The Nature of Turbulence in the Outer Regions of Protoplanetary Disks
• The Magnetoviscous-thermal Instability
• AHKASH: a new Hybrid particle-in-cell code for simulations of astrophysical collisionless plasma
• Spectral Analysis of Non-Ideal MRI Modes: The effect of Hall diffusion
• A systematic comparison of two-equation RANS turbulence models applied to shock-cloud interactions
• Balancing the load: A Voronoi based scheme for parallel computations
• Applying a star formation model calibrated on high-resolution interstellar medium simulations to cosmological simulations of galaxy formation
• Efficient magnetohydrodynamic simulations on graphics processing units with CUDA
• A New Residual Distribution Hydrodynamics Solver for Astrophysical Simulations
• A Co-Scaling Grid for Athena++
• Measuring the Numerical Viscosity in Simulations of Protoplanetary Disks in Cartesian Grids -- The Viscously Spreading Ring Revisited
• Linear Analysis and Simulations of the Cosmic-Ray Streaming Instability: the Importance of Oblique Waves
• Investigating disc-corona interaction in axisymmetric accretion disc models
• GenASiS: General Astrophysical Simulation System. II. Nonrelativistic Hydrodynamics
• A low-dissipation HLLD approximate Riemann solver for a very wide range of Mach numbers
• A general relativistic magnetohydrodynamics extension to mesh-less schemes in the code GIZMO
• MHD Code Using Multi Graphical Processing Units: SMAUG+
• Gas Inflow and Star Formation near Supermassive Black Holes: The Role of Nuclear Activity
• General relativistic hydrodynamics code for dynamical spacetimes with curvilinear coordinates, tabulated equations of state, and neutrino physics
• Pseudo-spectral solver versus grid-based solver: A quantitative accuracy test using GMHD3D and PLUTO4.4
• The Drag Instability in a 1D Isothermal C-Shock
• Numerical Methods for Simulating Star Formation
• Computational Fluid Dynamics with the Coupled Discrete Unified Gas Kinetic Scheme (CDUGKS)
• Multidimensional tests of a finite-volume solver for MHD with a real-gas equation of state
• Internal shocks in microquasar jets with a continuous Lorentz factor modulation
• Pade: A code for protoplanetary disk turbulence based on Pade differencing
• Impacts of Tidal Locking on Magnetospheric Energy Input to Exoplanet Atmospheres
• Subcritical transition to turbulence in accretion disc boundary layer
• Compact Runge-Kutta flux reconstruction methods for non-conservative hyperbolic equations
• Thermal damping of Weak Magnetosonic Turbulence in the Interstellar Medium
• Multi-cloud crushing -- the collective survival of cold clouds in galactic outflows
• The Kelvin-Helmholtz instability and smoothed particle hydrodynamics
• DISPATCH methods: an approximate, entropy-based Riemann solver for ideal magnetohydrodynamics
• Feedback Regulated Turbulence, Magnetic Fields, and Star Formation Rates in Galactic Disks
• Numerical Simulations of the Random Angular Momentum in Convection: Implications for Supergiant Collapse to Form Black Holes
• The small-scale turbulent dynamo in smoothed particle magnetohydrodynamics
• Transferring Data from a Voronoi Mesh to an Adaptive Cartesian Grid in Pursuit of Self-consistent Top-down Star Formation
• Shock corrugation to the rescue of the internal shock model in microquasars: The single-scale MHD view
• A Higher Order Godunov Method for Radiation Hydrodynamics: Radiation Subsystem
• Higher-order magnetohydrodynamic numerics
• The Yin-Yang Magnetic Flux Eruption (Yin-Yang-MFE) Code: A Global Corona Magnetohydrodynamic Code with the Yin-Yang grid
• CAFE-AMR: A computational MHD Solar Physics simulation tool that uses AMR
• New magnetohydrodynamic model available at NASA Community Coordinated Modeling Center
• A partially dimensionally-split approach to numerical MHD
• pyro: A teaching code for computational astrophysical hydrodynamics
• Quasi-Gasdynamic Approach for Numerical Solution of Magnetohydrodynamic Equations
• Revealing the drag instability in one-fluid nonideal MHD simulations of a 1D isothermal C-shock
• libyt: an In Situ Interface Connecting Simulations with yt, Python, and Jupyter Workflows
• Towards Exascale Simulations of the ICM Dynamo with WENO-Wombat
• Hydromagnetic waves in an expanding universe -- cosmological MHD code tests using analytic solutions
• Conservation of Angular Momentum in the Fast Multipole Method
• Shearing box simulations in the Rayleigh unstable regime
• A Parameter Space Exploration of High Resolution Numerically Evolved Early Type Galaxies Including AGN Feedback and Accurate Dynamical Treatment of Stellar Orbits