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Inhibition of turbulent cascade by sweep

Published online by Cambridge University Press:  01 January 1997

SHIYI CHEN  and
ROBERT H. KRAICHNAN
SHIYI CHEN
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, and Complex Systems Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
ROBERT H. KRAICHNAN
Affiliation:
369 Montezuma 108, Santa Fe, New Mexico 87501-2626, USA
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Abstract

The effects of large-scale sweeping velocity on the turbulent cascade to small scales are examined for two problems: the advection of a passive scalar by a multivariate-Gaussian velocity field and incompressible Alfvén-wave turbulence. In both cases, the sweeping produces anisotropy and reduces the strength of cascade. If the direction of the sweep velocity varies with time, a balance is reached between this anisotropy and isotropizing effects associated with the change of direction.

Type
Research Article
Information
Journal of Plasma Physics , Volume 57 , Issue 1 , January 1997 , pp. 187 - 193
Copyright
1997 Cambridge University Press

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