Quasi-Two-Dimensional MHD Turbulence in Three-Dimensional Flows
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Roberts, D. Aaron, Melvyn L. Goldstein, Anil E. Deane, and Sanjoy Ghosh. “Quasi-Two-Dimensional MHD Turbulence in Three-Dimensional Flows.” Physical Review Letters 82, no. 3 (January 18, 1999): 548–51. https://doi.org/10.1103/PhysRevLett.82.548.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We simulate how nearly two-dimensional magnetohydrodynamic turbulence can be initiated and how it evolves with distance in the third dimension. Expanding flows lead to a suppression of the nonlinear cascades, mainly due to the changing transverse length scales. Velocity fluctuation levels are determined more from the 2D dynamics than from the expansion except when the velocity fluctuations are initially dominant. With expansion, magnetic fluctuations always dominate velocity fluctuations at late times.