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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Large scale dissipation and filament instability in two-dimensional turbulence
Physical Review Letters, Volume 95, No. 1, Article 014503, Year 2005
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Description
Coherent vortices in two-dimensional turbulence induce far-field effects that stabilize vorticity filaments and inhibit the generation of new vortices. We show that the large-scale energy sink often included in numerical simulations of statistically stationary two-dimensional turbulence reduces the stabilizing role of the vortices, leading to filament instability and to continuous formation of new coherent vortices. This counterintuitive effect sheds new light on the mechanisms responsible for vortex formation in forced-dissipated two-dimensional turbulence, and it has significant impact on the temporal evolution of the vortex population in freely decaying turbulence. The time dependence of vortex statistics in the presence of a large-scale energy sink can be approximately described by a modified version of the scaling theory developed for small-scale dissipation. © 2005 The American Physical Society.
Authors & Co-Authors
Elhmaidi, D.
Tunisia, Tunis
Université de Tunis el Manar, Faculté Des Sciences de Tunis
Von Hardenberg, Jost
Italy, Bologna
Institute of Atmospheric Sciences and Climate, Bologna
Provenzale, A.
Italy, Bologna
Institute of Atmospheric Sciences and Climate, Bologna
Statistics
Citations: 8
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1103/PhysRevLett.95.014503
ISSN:
00319007
e-ISSN:
10797114
Study Design
Cross Sectional Study