Buscar
Mostrando ítems 1-10 de 97
Intermittency in the isotropic component of helical and nonhelical turbulent flows
(American Physical Society, 2010-01)
We analyze the isotropic component of turbulent flows spanning a broad range or Reynolds numbers. The aim is to identify scaling laws and their Reynolds number dependence in flows under different mechanical forcings. To ...
Isotropization at small scales of rotating helically driven turbulence
(Cambridge University Press, 2012-04)
We present numerical evidence of how three-dimensionalization occurs at small scale in rotating turbulence with Beltrami (ABC) forcing, creating helical flow. The Zeman scale ℓ Ω at which the inertial and eddy turn-over ...
New developments in isotropic turbulent models for FENE-P fluids
(2018-01-29)
The evolution of viscoelastic turbulent models, in the last years, has been significant due to the direct numeric simulation (DNS) advances, which allowed us to capture in detail the evolution of the viscoelastic effects ...
Time decorrelation in isotropic magnetohydrodynamic turbulence
(Europhysics Letters, 2011-12)
Time decorrelation in isotropic incompressible magnetohydrodynamic (MHD) turbulence is studied using three-dimensional numerical simulation. Eulerian and wavenumber-dependent correlation functions are obtained. Scaling ...
Depression of nonlinearity in decaying isotropic MHD turbulence
(American Physical Society, 2008-03)
Spectral method simulations show that undriven magnetohydrodynamic turbulence spontaneously generates coherent spatial correlations of several types, associated with local Beltrami fields, directional alignment of velocity ...
Multiscale permutation entropy analysis of laser beam wandering in isotropic turbulence
(American Physical Society, 2017-10)
We have experimentally quantified the temporal structural diversity from the coordinate fluctuations of a laser beam propagating through isotropic optical turbulence. The main focus here is on the characterization of the ...
Characterizing inertial and convective optical turbulence by detrended fluctuation analysis
(Spie, 2013-10)
Atmospheric turbulence is usually simulated at the laboratory by generating convective free flows with hot surfaces, or heaters. It is tacitly assumed that propagation experiments in this environment are comparable to those ...
Infinite dimensional Lie algebra associated with conformal transformations of the two-point velocity correlation tensor from isotropic turbulence
(Birkhauser VerlagBasel, 2013)
We deal with homogeneous isotropic turbulence and use the two-point velocity correlation tensor field (parametrized
by the time variable t) of the velocity fluctuations to equip an affine space K3 of the correlation vectors ...
Statistics of injected power on a bouncing ball subjected to a randomly vibrating piston
(Amer Physical Soc, 2015)
We present an experimental study on the statistical properties of the injected power needed to maintain an inelastic ball bouncing constantly on a randomly accelerating piston in the presence of gravity. We compute the ...