Athena: a new code for astrophysical mhd
TLDR
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.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.read more
Citations
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Journal ArticleDOI
E pur si muove: Galilean-invariant cosmological hydrodynamical simulations on a moving mesh
TL;DR: In this article, a moving unstructured mesh defined by the Voronoi tessellation of a set of discrete points is used to solve the hyperbolic conservation laws of ideal hydrodynamics with a finite volume approach, based on a second-order unsplit Godunov scheme with an exact Riemann solver.
Journal ArticleDOI
A new class of accurate, mesh-free hydrodynamic simulation methods
TL;DR: In this paper, a Lagrangian method for hydrodynamics is proposed to simultaneously capture advantages of both SPH and grid-based/adaptive mesh refinement (AMR) schemes.
Journal ArticleDOI
Enzo: an adaptive mesh refinement code for astrophysics
Greg L. Bryan,Michael L. Norman,Brian W. O'Shea,Tom Abel,John H. Wise,Matthew J. Turk,Daniel R. Reynolds,David C. Collins,Peng Wang,Peng Wang,Samuel W. Skillman,Samuel W. Skillman,Britton D. Smith,Britton D. Smith,Robert P. Harkness,James Bordner,Ji-hoon Kim,Michael Kuhlen,Hao Xu,Nathan J. Goldbaum,Cameron Hummels,Alexei G. Kritsuk,Elizabeth J. Tasker,Stephen Skory,Christine M. Simpson,Oliver Hahn,Jeffrey S. Oishi,Geoffrey C. So,Fen Zhao,Renyue Cen,Yuan Li +30 more
TL;DR: Enzo as discussed by the authors uses block-structured adaptive mesh refinement to provide high spatial and temporal resolution for modeling astrophysical fluid flows, which can be run in one, two, and three dimensions, and supports a wide variety of physics, including hydrodynamics, ideal and non-ideal magnetohydrodynamic, N-body dynamics, primordial gas chemistry, optically thin radiative cooling of primordial and metal-enriched plasmas, and models for star formation and feedback in a cosmological context.
Journal ArticleDOI
FIRE-2 simulations: physics versus numerics in galaxy formation
Philip F. Hopkins,Andrew Wetzel,Andrew Wetzel,Andrew Wetzel,Dušan Kereš,Claude André Faucher-Giguère,Eliot Quataert,Michael Boylan-Kolchin,Norman Murray,Christopher C. Hayward,Shea Garrison-Kimmel,Cameron Hummels,Robert Feldmann,Robert Feldmann,Paul Torrey,Xiangcheng Ma,Daniel Anglés-Alcázar,Kung-Yi Su,Matthew E. Orr,Denise Schmitz,Ivanna Escala,Robyn E. Sanderson,Michael Y. Grudić,Zachary Hafen,Ji-hoon Kim,Alex Fitts,James S. Bullock,Coral Wheeler,T. K. Chan,Oliver D. Elbert,Desika Narayanan +30 more
TL;DR: The Feedback In Realistic Environments (FIRE) project explores feedback in cosmological galaxy formation simulations as mentioned in this paper, which has been used to explore new physics (e.g. magnetic fields).
Journal ArticleDOI
Wind-driven Accretion in Protoplanetary Disks. I. Suppression of the Magnetorotational Instability and Launching of the Magnetocentrifugal Wind
TL;DR: In this paper, the authors performed local, vertically stratified shearing box MHD simulations of protoplanetary disks (PPDs) at a fiducial radius of 1 AU that take into account the effects of both Ohmic resistivity and ambipolar diffusion (AD).
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