Physics – Plasma Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dppfm1003z&link_type=abstract
American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C
Physics
Plasma Physics
Scientific paper
The magnetohydrodynamic (MHD) approximation has been quite successful in space plasma physics and astrophysics. In particular, many manifestations of turbulence and other nonlinear phenomena in astrophysical plasma are explainable from a MHD turbulence perspective. In this talk, the fundamental physical processes involving energy transfer and interacting scales in incompressible MHD turbulence, including triadic interactions, are addressed. After reviewing the proposed isotropic and anisotropic energy spectra, the cascade process is discussed in detail along with the response of the small scales to large-scale anisotropy and mean magnetic field. We will stress the interplay between the external time scale and turbulence nonlinear time scale. The eddy-damped quasi-normal Markovian (EDQNM) closure model and direct numerical simulations will be used to illustrate some of these points. Finally, the application to the subgrid modeling for large-eddy simulation of MHD turbulence is discussed. *Work performed for the US DOE by UC LLNL under contract W-7405-Eng-48 and was supported by NSF under grant ATM 9814045.
Zhou Ye
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