Hydrodynamic turbulence and intermittent random fields

Lagrangian evolution, non-Gaussianity, and statistical geometry in intermittent hydrodynamic turbulence

Statistical Analysis of Discontinuities in Solar Wind Ace Data and Comparison with Intermittent Mhd Turbulence

The comparison between Advanced Composition Explorer (ACE) solar wind data and simulations of magnetohydrodynamic (MHD) turbulence shows a good agreement in the waiting-time analysis of magnetic field increments. Similarity between classical discontinuity identification and intermittency analysis suggests a dynamical connection between solar wind discontinuities and intermittent MHD turbulence....

A lattice Boltzmann study of non-hydrodynamic effects in shell models of turbulence

A lattice Boltzmann scheme simulating the dynamics of shell models of turbulence is developed. The influence of high order kinetic modes (ghosts) on the dissipative properties of turbulence dynamics is studied. It is analytically found that when ghost fields relax on the same time scale as the hydrodynamic ones, their major effect is a net enhancement of the fluid viscosity. The bare fluid visc...

Self-similarity and Nite Time Intermittent Eeects in Turbulent Sequences

We propose a method to analyze a turbulent sequence focusing on the self-similar properties of the discrete system it generates. First we show how to approximate the self-similar exponent (= 1=3 in the case of hydrodynamic turbulence) from the nite time measurements, and then we establish a criterion to characterize the deviations from asymptotic scaling of the empirical measure generated by ni...

Draping of Cluster Magnetic Fields over Bullets and Bubbles – Morphology and Dynamic Effects

High-resolution X-ray observations have revealed cavities and ‘cold fronts’ with sharp edges in temperature and density within galaxy clusters. Their presence poses a puzzle since these features are not expected to be hydrodynamically stable, or to remain sharp in the presence of diffusion. However, a moving core or bubble in even a very weakly magnetized plasma necessarily sweeps up enough mag...