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• W2047601182 abstract "We demonstrate that, for the case of quasiequipartition between the velocity and the magnetic field, the Lagrangian-averaged magnetohydrodynamics (LAMHD) alpha model reproduces well both the large-scale and the small-scale properties of turbulent flows; in particular, it displays no increased (superfilter) bottleneck effect with its ensuing enhanced energy spectrum at the onset of the subfilter scales. This is in contrast to the case of the neutral fluid in which the Lagrangian-averaged Navier-Stokes alpha model is somewhat limited in its applications because of the formation of spatial regions with no internal degrees of freedom and subsequent contamination of superfilter-scale spectral properties. We argue that, as the Lorentz force breaks the conservation of circulation and enables spectrally nonlocal energy transfer (associated with Alfvén waves), it is responsible for the absence of a viscous bottleneck in magnetohydrodynamics (MHD), as compared to the fluid case. As LAMHD preserves Alfvén waves and the circulation properties of MHD, there is also no (superfilter) bottleneck found in LAMHD, making this method capable of large reductions in required numerical degrees of freedom; specifically, we find a reduction factor of approximately 200 when compared to a direct numerical simulation on a large grid of 1536;{3} points at the same Reynolds number." @default.
• W2047601182 created "2016-06-24" @default.
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• W2047601182 date "2009-07-22" @default.
• W2047601182 modified "2023-10-16" @default.
• W2047601182 title "Lagrangian-averaged model for magnetohydrodynamic turbulence and the absence of bottlenecks" @default.
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• W2047601182 doi "https://doi.org/10.1103/physreve.80.016313" @default.
• W2047601182 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19658812" @default.
• W2047601182 hasPublicationYear "2009" @default.
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