Physics – Fluid Dynamics
Scientific paper
2010-09-28
Physical Review Letters 105 (2010) 145001
Physics
Fluid Dynamics
Scientific paper
10.1103/PhysRevLett.105.145001
The Lagrangian velocity statistics of dissipative drift-wave turbulence are investigated. For large values of the adiabaticity (or small collisionality), the probability density function of the Lagrangian acceleration shows exponential tails, as opposed to the stretched exponential or algebraic tails, generally observed for the highly intermittent acceleration of Navier-Stokes turbulence. This exponential distribution is shown to be a robust feature independent of the Reynolds number. For small adiabaticity, algebraic tails are observed, suggesting the strong influence of point-vortex-like dynamics on the acceleration. A causal connection is found between the shape of the probability density function and the autocorrelation of the norm of the acceleration.
Bos Wouter
Kadoch Benjamin
Schneider Kai
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