Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations
In this work we numerically test a model of Hall magnetohydrodynamics in the presence of a strong mean magnetic field: the reduced Hall magnetohydrodynamic model (RHMHD) derived by [Gomez, Phys. Plasmas 15, 102303 (2008)] with the addition of weak compressible effects. The main advantage of this mod...
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todo:paper_1070664X_v17_n11_p_Martin2023-10-03T16:02:31Z Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations Martin, L.N. Dmitruk, P. Gomez, D.O. Computational costs Hall magnetohydrodynamics Hall MHD Initial conditions Mean magnetic field Strong magnetic fields Hall effect Magnetic fields Magnetohydrodynamics Magnetoplasma Three dimensional computer graphics Turbulence Three dimensional In this work we numerically test a model of Hall magnetohydrodynamics in the presence of a strong mean magnetic field: the reduced Hall magnetohydrodynamic model (RHMHD) derived by [Gomez, Phys. Plasmas 15, 102303 (2008)] with the addition of weak compressible effects. The main advantage of this model lies in the reduction of computational cost. Nevertheless, up until now the degree of agreement with the original Hall MHD system and the range of validity in a regime of turbulence were not established. In this work direct numerical simulations of three-dimensional Hall MHD turbulence in the presence of a strong mean magnetic field are compared with simulations of the weak compressible RHMHD model. The results show that the degree of agreement is very high (when the different assumptions of RHMHD, such as spectral anisotropy, are satisfied). Nevertheless, when the initial conditions are isotropic but the mean magnetic field is maintained strong, the results differ at the beginning but asymptotically reach a good agreement at relatively short times. We also found evidence that the compressibility still plays a role in the dynamics of these systems, and the weak compressible RHMHD model is able to capture these effects. In conclusion the weak compressible RHMHD model is a valid approximation of the Hall MHD turbulence in the relevant physical context. © 2010 American Institute of Physics. Fil:Dmitruk, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gomez, D.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1070664X_v17_n11_p_Martin |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Computational costs Hall magnetohydrodynamics Hall MHD Initial conditions Mean magnetic field Strong magnetic fields Hall effect Magnetic fields Magnetohydrodynamics Magnetoplasma Three dimensional computer graphics Turbulence Three dimensional |
spellingShingle |
Computational costs Hall magnetohydrodynamics Hall MHD Initial conditions Mean magnetic field Strong magnetic fields Hall effect Magnetic fields Magnetohydrodynamics Magnetoplasma Three dimensional computer graphics Turbulence Three dimensional Martin, L.N. Dmitruk, P. Gomez, D.O. Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
topic_facet |
Computational costs Hall magnetohydrodynamics Hall MHD Initial conditions Mean magnetic field Strong magnetic fields Hall effect Magnetic fields Magnetohydrodynamics Magnetoplasma Three dimensional computer graphics Turbulence Three dimensional |
description |
In this work we numerically test a model of Hall magnetohydrodynamics in the presence of a strong mean magnetic field: the reduced Hall magnetohydrodynamic model (RHMHD) derived by [Gomez, Phys. Plasmas 15, 102303 (2008)] with the addition of weak compressible effects. The main advantage of this model lies in the reduction of computational cost. Nevertheless, up until now the degree of agreement with the original Hall MHD system and the range of validity in a regime of turbulence were not established. In this work direct numerical simulations of three-dimensional Hall MHD turbulence in the presence of a strong mean magnetic field are compared with simulations of the weak compressible RHMHD model. The results show that the degree of agreement is very high (when the different assumptions of RHMHD, such as spectral anisotropy, are satisfied). Nevertheless, when the initial conditions are isotropic but the mean magnetic field is maintained strong, the results differ at the beginning but asymptotically reach a good agreement at relatively short times. We also found evidence that the compressibility still plays a role in the dynamics of these systems, and the weak compressible RHMHD model is able to capture these effects. In conclusion the weak compressible RHMHD model is a valid approximation of the Hall MHD turbulence in the relevant physical context. © 2010 American Institute of Physics. |
format |
JOUR |
author |
Martin, L.N. Dmitruk, P. Gomez, D.O. |
author_facet |
Martin, L.N. Dmitruk, P. Gomez, D.O. |
author_sort |
Martin, L.N. |
title |
Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
title_short |
Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
title_full |
Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
title_fullStr |
Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
title_full_unstemmed |
Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations |
title_sort |
hall effect in a strong magnetic field: direct comparisons of compressible magnetohydrodynamics and the reduced hall magnetohydrodynamic equations |
url |
http://hdl.handle.net/20.500.12110/paper_1070664X_v17_n11_p_Martin |
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