A detailed examination of anisotropy and timescales in three-dimensional incompressible magnetohydrodynamic turbulence
When magnetohydrodynamic turbulence evolves in the presence of a large-scale mean magnetic field, an anisotropy develops relative to that preferred direction. The well-known tendency is to develop stronger gradients perpendicular to the magnetic field, relative to the direction along the field. This...
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creator | Chhiber, Rohit Matthaeus, William H. Oughton, Sean Parashar, Tulasi N. |
description | When magnetohydrodynamic turbulence evolves in the presence of a large-scale mean magnetic field, an anisotropy develops relative to that preferred direction. The well-known tendency is to develop stronger gradients perpendicular to the magnetic field, relative to the direction along the field. This anisotropy of the spectrum is deeply connected with the anisotropy of estimated timescales for dynamical processes and requires reconsideration of basic issues such as scale locality and spectral transfer. Here, analysis of high-resolution three-dimensional simulations of unforced magnetohydrodynamic turbulence permits quantitative assessment of the behavior of theoretically relevant timescales in Fourier wavevector space. We discuss the distribution of nonlinear times, Alfvén times, and estimated spectral transfer rates. Attention is called to the potential significance of special regions of the spectrum, such as the two-dimensional limit and the “critical balance” region. A formulation of estimated spectral transfer in terms of a suppression factor supports a conclusion that the quasi-two-dimensional fluctuations (characterized by strong nonlinearities) are not a singular limit, but may be in general expected to make important contributions. |
doi_str_mv | 10.1063/5.0005109 |
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A formulation of estimated spectral transfer in terms of a suppression factor supports a conclusion that the quasi-two-dimensional fluctuations (characterized by strong nonlinearities) are not a singular limit, but may be in general expected to make important contributions.</description><subject>Anisotropy</subject><subject>Computational fluid dynamics</subject><subject>Fluid flow</subject><subject>Magnetic fields</subject><subject>Magnetohydrodynamic turbulence</subject><subject>Magnetohydrodynamics</subject><subject>Plasma physics</subject><subject>Spectra</subject><subject>Three dimensional analysis</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqd0E1LAzEQBuBFFKzVg_8g4Elha7L52N1jKX5BwYuCt5AmszZld7Mm2WL_vaktePc0w8zDMLxZdk3wjGBB7_kMY8wJrk-yCcFVnZeiZKf7vsS5EOzjPLsIYZMQE7yaZNs5MhCVbcEg-Fad7VW0rkeuQaq3wUXvhl1qDYq2g6BVCwHZHsW1B8hNmvUhedWmoXbd4CEEu2oBdeqzh-jWO-Od2fXpskZx9KuxhV7DZXbWqDbA1bFOs_fHh7fFc758fXpZzJe5pkUZ84oURrCG8poSw2mjjVY1K3DJGq4ENpqIoqgBoMLMaIxrmtaqNkphxTQhdJrdHO4O3n2NEKLcuNGnd4MsGOFckIqwpG4PSnsXgodGDt52yu8kwXIfq-TyGGuydwcbtI2_Wf0Pb53_g3IwDf0B1rKIxQ</recordid><startdate>202006</startdate><enddate>202006</enddate><creator>Chhiber, Rohit</creator><creator>Matthaeus, William H.</creator><creator>Oughton, Sean</creator><creator>Parashar, Tulasi N.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-7174-6948</orcidid><orcidid>https://orcid.org/0000-0001-7224-6024</orcidid><orcidid>https://orcid.org/0000-0002-2814-7288</orcidid></search><sort><creationdate>202006</creationdate><title>A detailed examination of anisotropy and timescales in three-dimensional incompressible magnetohydrodynamic turbulence</title><author>Chhiber, Rohit ; Matthaeus, William H. ; Oughton, Sean ; Parashar, Tulasi N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c327t-812d64f35931d53fcdca942074f5a60dc16229eee804dc0093a94a9daa0a4c113</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Anisotropy</topic><topic>Computational fluid dynamics</topic><topic>Fluid flow</topic><topic>Magnetic fields</topic><topic>Magnetohydrodynamic turbulence</topic><topic>Magnetohydrodynamics</topic><topic>Plasma physics</topic><topic>Spectra</topic><topic>Three dimensional analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chhiber, Rohit</creatorcontrib><creatorcontrib>Matthaeus, William H.</creatorcontrib><creatorcontrib>Oughton, Sean</creatorcontrib><creatorcontrib>Parashar, Tulasi N.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chhiber, Rohit</au><au>Matthaeus, William H.</au><au>Oughton, Sean</au><au>Parashar, Tulasi N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A detailed examination of anisotropy and timescales in three-dimensional incompressible magnetohydrodynamic turbulence</atitle><jtitle>Physics of plasmas</jtitle><date>2020-06</date><risdate>2020</risdate><volume>27</volume><issue>6</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>When magnetohydrodynamic turbulence evolves in the presence of a large-scale mean magnetic field, an anisotropy develops relative to that preferred direction. 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source | AIP Journals Complete; Alma/SFX Local Collection |
subjects | Anisotropy Computational fluid dynamics Fluid flow Magnetic fields Magnetohydrodynamic turbulence Magnetohydrodynamics Plasma physics Spectra Three dimensional analysis |
title | A detailed examination of anisotropy and timescales in three-dimensional incompressible magnetohydrodynamic turbulence |
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