The phenomenon of vortex-merging in two-dimensional hydrodynamics has been investigated through direct numerical simulations. The fast and local processes that occur during the turbulent relaxation of a randomly initialized system in periodic geometry have been examined. The analysis reveals that many of the coherent structures can be described by a local principle of maximization of entropy. The validity of this entropy principle has been further confirmed by time dependent statistics, using a contour-tracking technique. Possible implications for the description of persistent coherent vortices, commonly observed in the atmosphere, have been discussed.

Local relaxation processes and maximum entropy states in two-dimensional hydrodynamic turbulence

Primavera L;SERVIDIO, SERGIO;CARBONE, Vincenzo
2010-01-01

Abstract

The phenomenon of vortex-merging in two-dimensional hydrodynamics has been investigated through direct numerical simulations. The fast and local processes that occur during the turbulent relaxation of a randomly initialized system in periodic geometry have been examined. The analysis reveals that many of the coherent structures can be described by a local principle of maximization of entropy. The validity of this entropy principle has been further confirmed by time dependent statistics, using a contour-tracking technique. Possible implications for the description of persistent coherent vortices, commonly observed in the atmosphere, have been discussed.
2010
ATMOSPHERIC PROCESSES / Turbulence; NONLINEAR GEOPHYSICS / Turbulence
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/175067
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