期刊
ASTROPHYSICAL JOURNAL
卷 745, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/745/2/139
关键词
ISM: kinematics and dynamics; ISM: magnetic fields; magnetic fields; magnetohydrodynamics (MHD); methods: numerical; stars: formation; turbulence
资金
- NASA through NASA ATP [NNX09AK31G]
- US Department of Energy at the Lawrence Livermore National Laboratory [DE-AC52-07NA 27344]
- Lawrence Berkeley National Laboratory [DE-AC02-05CH11231]
- NSF [AST-0908553]
- LRAC from the NSF
- NASA Advanced Computing (NAS) Division through NASA ATP
- NASA [NNX09AK31G, 114137] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien [905801, 0908553] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [905801, 0908553] Funding Source: National Science Foundation
Performing a stable, long-duration simulation of driven MHD turbulence with a high thermal Mach number and a strong initial magnetic field is a challenge to high-order Godunov ideal MHD schemes because of the difficulty in guaranteeing positivity of the density and pressure. We have implemented a robust combination of reconstruction schemes, Riemann solvers, limiters, and constrained transport electromotive force averaging schemes that can meet this challenge, and using this strategy, we have developed a new adaptive mesh refinement (AMR) MHD module of the ORION2 code. We investigate the effects of AMR on several statistical properties of a turbulent ideal MHD system with a thermal Mach number of 10 and a plasma beta(0) of 0.1 as initial conditions; our code is shown to be stable for simulations with higher Mach numbers (M-rms = 17.3) and smaller plasma beta (beta(0) = 0.0067) as well. Our results show that the quality of the turbulence simulation is generally related to the volume-averaged refinement. Our AMR simulations show that the turbulent dissipation coefficient for supersonic MHD turbulence is about 0.5, in agreement with unigrid simulations.
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