INVESTIGADORES
MININNI Pablo Daniel
congresos y reuniones científicas
Título:
Scale interactions in MHD turbulence and dynamo action
Autor/es:
P.D. MININNI
Lugar:
Denver
Reunión:
Congreso; American Physical Society March meeting; 2007
Institución organizadora:
APS
Resumen:
In recent years the increase in computing
power, as well as the development of subgrid models for
magnetohydrodynamic (MHD) turbulence has allowed the study of a
numerically almost unexplored territory in MHD flows: the regime of low
magnetic Prandtl number (PM). This regime is of particular importance
since several astrophysical and geophysical problems are characterized
by PM<1, as for example in the liquid core of planets such as the
Earth, or in the convection zone of stars as the Sun. Liquid metals
used in dynamo experiments to generate magnetic fields are also
characterized by PM<1. In this talk we will review some studies of
dynamo action and MHD turbulence for PM<1, down to PM~5x10^(-3). In
particular, we will focus on cases where a large scale flow is present
and turbulence develops as the result of an instability. Interactions
between scales will be discussed, and evidence of non-local
interactions involving disparate scales in simulations of MHD
turbulence with resolutions up to 1536^3 grid points will be presented.
The implications of these results for universality will be briefly
discussed.