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Abstract:

We present a numerical analysis of an incompressible decaying magnetohydrodynamic turbulence run on a grid of 15363 points. The Taylor Reynolds number at the maximum of dissipation is 1100, and the initial condition is a superposition of large-scale Arn'old-Beltrami-Childress flows and random noise at small scales, with no uniform magnetic field. The initial kinetic and magnetic energies are equal, with negligible correlation. The resulting energy spectrum is a combination of two components, each moderately resolved. Isotropy obtains in the large scales, with a spectral law compatible with the Iroshnikov-Kraichnan theory stemming from the weakening of nonlinear interactions due to Alfvén waves; scaling of structure functions confirms the non-Kolmogorovian nature of the flow in this range. At small scales, weak turbulence emerges with a k-2 spectrum, the perpendicular direction referring to the local quasiuniform magnetic field. © 2007 The American Physical Society.

Registro:

Documento: Artículo
Título:Energy spectra stemming from interactions of Alfvén waves and turbulent eddies
Autor:Mininni, P.D.; Pouquet, A.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
NCAR, P.O. Box 3000, Boulder, CO 80307-3000, United States
Palabras clave:Energy dissipation; Magnetic fields; Magnetohydrodynamics; Numerical analysis; Spectrum analysis; Energy spectra; Structure functions; Turbulence
Año:2007
Volumen:99
Número:25
DOI: http://dx.doi.org/10.1103/PhysRevLett.99.254502
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett
ISSN:00319007
CODEN:PRLTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v99_n25_p_Mininni

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Citas:

---------- APA ----------
Mininni, P.D. & Pouquet, A. (2007) . Energy spectra stemming from interactions of Alfvén waves and turbulent eddies. Physical Review Letters, 99(25).
http://dx.doi.org/10.1103/PhysRevLett.99.254502
---------- CHICAGO ----------
Mininni, P.D., Pouquet, A. "Energy spectra stemming from interactions of Alfvén waves and turbulent eddies" . Physical Review Letters 99, no. 25 (2007).
http://dx.doi.org/10.1103/PhysRevLett.99.254502
---------- MLA ----------
Mininni, P.D., Pouquet, A. "Energy spectra stemming from interactions of Alfvén waves and turbulent eddies" . Physical Review Letters, vol. 99, no. 25, 2007.
http://dx.doi.org/10.1103/PhysRevLett.99.254502
---------- VANCOUVER ----------
Mininni, P.D., Pouquet, A. Energy spectra stemming from interactions of Alfvén waves and turbulent eddies. Phys Rev Lett. 2007;99(25).
http://dx.doi.org/10.1103/PhysRevLett.99.254502