Artículo
Direct numerical simulations of helical dynamo action: MHD and beyond
Fecha de publicación:
12/2004
Editorial:
Copernicus Publications
Revista:
Nonlinear Processes In Geophysics
ISSN:
1023-5809
e-ISSN:
1607-7946
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Magnetohydrodynamic Dynamo
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Gomez, Daniel Osvaldo; Mininni, Pablo Daniel; Direct numerical simulations of helical dynamo action: MHD and beyond; Copernicus Publications; Nonlinear Processes In Geophysics; 11; 5-6; 12-2004; 619-629
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