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Anisotrophy of magnetohydrodynamic turbulence at low magnetic Reynolds number

Anisotrophy of magnetohydrodynamic turbulence at low magnetic Reynolds number
Anisotrophy of magnetohydrodynamic turbulence at low magnetic Reynolds number
Turbulent fluctuations in magnetohydrodynamic flows are known to become anisotropic under the action of a sufficiently strong magnetic field. We investigate this phenomenon in the case of low magnetic Reynolds number using direct numerical simulations and large eddy simulations of a forced flow in a periodic box. A series of simulations is performed with different strengths of the magnetic field, varying Reynolds number, and two types of forcing, one of which is isotropic and the other limited to two-dimensional flow modes. We find that both the velocity anisotropy (difference in the relative amplitude of the velocity components) and the anisotropy of the velocity gradients are predominantly determined by the value of the magnetic interaction parameter. The effects of the Reynolds number and the type of forcing are much weaker. We also find that the anisotropy varies only slightly with the length scale.
magnetohydrodynamics, turbulence, flow simulation, confined flow
1070-6631
125105-[12pp]
Vorobev, Anatoliy
911a4e1e-0c34-4297-b52e-c22a2b9dec01
Zikanov, Oleg
11eb1f85-5e32-4c0d-86e0-26f7633f1e90
Davidson, Peter A.
6c07a04e-bddc-4a25-b8a7-e00103ab8785
Knaepen, Bernhard
d8ec44e1-9437-47f3-a33b-ed60a9ed50a2
Vorobev, Anatoliy
911a4e1e-0c34-4297-b52e-c22a2b9dec01
Zikanov, Oleg
11eb1f85-5e32-4c0d-86e0-26f7633f1e90
Davidson, Peter A.
6c07a04e-bddc-4a25-b8a7-e00103ab8785
Knaepen, Bernhard
d8ec44e1-9437-47f3-a33b-ed60a9ed50a2

Vorobev, Anatoliy, Zikanov, Oleg, Davidson, Peter A. and Knaepen, Bernhard (2005) Anisotrophy of magnetohydrodynamic turbulence at low magnetic Reynolds number. Physics of Fluids, 17 (12), 125105-[12pp]. (doi:10.1063/1.2140847).

Record type: Article

Abstract

Turbulent fluctuations in magnetohydrodynamic flows are known to become anisotropic under the action of a sufficiently strong magnetic field. We investigate this phenomenon in the case of low magnetic Reynolds number using direct numerical simulations and large eddy simulations of a forced flow in a periodic box. A series of simulations is performed with different strengths of the magnetic field, varying Reynolds number, and two types of forcing, one of which is isotropic and the other limited to two-dimensional flow modes. We find that both the velocity anisotropy (difference in the relative amplitude of the velocity components) and the anisotropy of the velocity gradients are predominantly determined by the value of the magnetic interaction parameter. The effects of the Reynolds number and the type of forcing are much weaker. We also find that the anisotropy varies only slightly with the length scale.

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Published date: December 2005
Keywords: magnetohydrodynamics, turbulence, flow simulation, confined flow

Identifiers

Local EPrints ID: 48857
URI: http://eprints.soton.ac.uk/id/eprint/48857
ISSN: 1070-6631
PURE UUID: d20b73f6-bebb-4034-9c74-b635eb6abdb8
ORCID for Anatoliy Vorobev: ORCID iD orcid.org/0000-0002-6458-9390

Catalogue record

Date deposited: 16 Oct 2007
Last modified: 09 Jan 2022 03:27

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Contributors

Author: Oleg Zikanov
Author: Peter A. Davidson
Author: Bernhard Knaepen

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