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Eulerian and Lagrangian studies in surface flow turbulence
Experimental and numerical studies of turbulent fluid motion in a free surface are presented. The flow is realized experimentally on the surface of a tank filled with water stirred well below the
Lagrangian tracers on a surface flow: the role of time correlations.
The degree of clustering characterized by the Lyapunov spectrum of the flow is numerically shown to be in qualitative agreement with the predictions for the white-in-time compressible Kraichnan flow, but to deviate quantitatively for intermediate values of compressibility.
Mapping stochastic processes onto complex networks
A method by which stochastic processes are mapped onto complex networks is introduced and it is demonstrated that the time series can be reconstructed with high precision by means of a simple random walk on their corresponding networks.
Stretching of polymers around the Kolmogorov scale in a turbulent shear flow
We present numerical studies of stretching of Hookean dumbbells in a turbulent Navier-Stokes flow with a linear mean profile, ⟨ux⟩=Sy. In addition to the turbulence features beyond the viscous
Taylor's frozen-flow hypothesis in Burgers turbulence.
The analytical treatment verifies the so-called Taylor's frozen-flow hypothesis without relying on any closure and under very general assumptions and shows that it is valid up to time scales smaller than the correlation time scale of temporal velocity correlation function.
Multifractal clustering of passive tracers on a surface flow
We study the anomalous scaling of the mass density measure of Lagrangian tracers in a compressible flow realized on the free surface on top of a three-dimensional flow. The full two-dimensional
Mean profiles for a passive scalar in wall-bounded flows from symmetry analysis
Based on the symmetry properties of the equations for a passive scalar in turbulent wall-bounded flows we derive the symmetry invariant mean profiles of the scalar. In a unifying framework we
Fluctuation of Mass Flux in a Cloud-Resolving Simulation with Interactive Radiation
Abstract It was shown by Craig and Cohen that fluctuations of cumulus clouds under homogeneous large-scale forcing satisfy the Gibbs canonical ensemble in a strict radiative–convective equilibrium
Theoretical Model for the Kramers-Moyal Description of Turbulence Cascades
We derive the Kramers-Moyal equation for the conditional probability density of velocity increments from the theoretical model recently proposed by V.Yakhot [Phys.Rev.E {\bf 57}, 1737 (1998)] in the