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Abstract:

Magnetohydrodynamic dynamo action is often invoked to explain the existence of magnetic fields in several astronomical objects. In this work, we present direct numerical simulations of MHD helical dynamos, to study the exponential growth and saturation of magnetic fields. Simulations are made within the framework of incompressible flows and using periodic boundary conditions. The statistical properties of the flow are studied, and it is found that its helicity displays strong spatial fluctuations. Regions with large kinetic helicity are also strongly concentrated in space, forming elongated structures. In dynamo simulations using these flows, we found that the growth rate and the saturation level of magnetic energy and magnetic helicity reach an asymptotic value as the Reynolds number is increased. Finally, extensions of the MHD theory to include kinetic effects relevant in astrophysical environments are discussed. © European Geosciences Union 2004.

Registro:

Documento: Artículo
Título:Direct numerical simulations of helical dynamo action: MHD and beyond
Autor:Gómez, D.O.; Mininni, P.D.
Filiación:Departamento de Física, Fac. de Ciencias Exactas/Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Inst. Astronomia/Fisica del Espacio, CONICET, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Advanced Study Program, National Center for Atmospheric Res., P.O. Box 3000, Boulder, CO 80307, United States
Palabras clave:magnetohydrodynamics; numerical model
Año:2004
Volumen:11
Número:5-6
Página de inicio:619
Página de fin:629
Título revista:Nonlinear Processes in Geophysics
Título revista abreviado:Nonlinear Processes Geophys.
ISSN:10235809
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10235809_v11_n5-6_p619_Gomez

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Citas:

---------- APA ----------
Gómez, D.O. & Mininni, P.D. (2004) . Direct numerical simulations of helical dynamo action: MHD and beyond. Nonlinear Processes in Geophysics, 11(5-6), 619-629.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10235809_v11_n5-6_p619_Gomez [ ]
---------- CHICAGO ----------
Gómez, D.O., Mininni, P.D. "Direct numerical simulations of helical dynamo action: MHD and beyond" . Nonlinear Processes in Geophysics 11, no. 5-6 (2004) : 619-629.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10235809_v11_n5-6_p619_Gomez [ ]
---------- MLA ----------
Gómez, D.O., Mininni, P.D. "Direct numerical simulations of helical dynamo action: MHD and beyond" . Nonlinear Processes in Geophysics, vol. 11, no. 5-6, 2004, pp. 619-629.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10235809_v11_n5-6_p619_Gomez [ ]
---------- VANCOUVER ----------
Gómez, D.O., Mininni, P.D. Direct numerical simulations of helical dynamo action: MHD and beyond. Nonlinear Processes Geophys. 2004;11(5-6):619-629.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10235809_v11_n5-6_p619_Gomez [ ]