Extreme Lagrangian acceleration in confined turbulent flow

Details Extreme Lagrangian acceleration in confined turbulent flow Extreme Lagrangian acceleration in confined turbulent flow

2008-02-21

arxiv.org/abs/0802.3139v1

Phys.Rev.Lett.100:184503,2008

Physics

Classical Physics

Scientific paper

10.1103/PhysRevLett.100.184503

A Lagrangian study of two-dimensional turbulence for two different geometries, a periodic and a confined circular geometry, is presented to investigate the influence of solid boundaries on the Lagrangian dynamics. It is found that the Lagrangian acceleration is even more intermittent in the confined domain than in the periodic domain. The flatness of the Lagrangian acceleration as a function of the radius shows that the influence of the wall on the Lagrangian dynamics becomes negligible in the center of the domain and it also reveals that the wall is responsible for the increased intermittency. The transition in the Lagrangian statistics between this region, not directly influenced by the walls, and a critical radius which defines a Lagrangian boundary layer, is shown to be very sharp with a sudden increase of the acceleration flatness from about 5 to about 20.

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