Physics – Plasma Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3102807m&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 2, CiteID L02807
Physics
Plasma Physics
28
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Turbulence
Scientific paper
A two-dimensional MHD simulation of the Kelvin-Helmholtz (K-H) instability in a non-uniform density medium shows a strong development of turbulence through non-linear instabilities. The difference in density between the two media plays a crucial role on the fast turbulent mixing and transport. The onset of the turbulence is triggered not only by secondary K-H instability but also by Rayleigh-Taylor (R-T) instability at the density interface inside the normal K-H vortex, whose onset mechanisms are attributed to the centrifugal force of the rotating motion. The secondary R-T instability alters the macroscopic structure by transporting dense fluids to tenuous region, while the secondary K-H instability is just a seed for the turbulence. The onset mechanism and the formation of the broad mixing layer give a new understanding of the mixing process in a variety of geo- and astrophysical phenomena.
Hoshino Masahiro
Matsumoto Yosuke
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