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Passive scalar cascades in rotating helical and non-helical flows
(IOP Publishing, 2013-07)
We study how helicity affects the spectrum of a passive scalar in rotating turbulent flows, using numerical simulations of turbulent flows with or without rotation and with or without injection of helicity. Scaling laws ...
Effect of Helicity and Rotation on the Free Decay of Turbulent Flows
(American Physical Society, 2009-06)
The self-similar decay of energy in a turbulent flow is studied in direct numerical simulations with and without rotation. Two initial conditions are considered: one nonhelical (mirror symmetric) and one with maximal ...
Inverse cascades and resonant triads in rotating and stratified turbulence
(American Institute of Physics, 2017-11)
Kraichnan’s seminal ideas on inverse cascades yielded new tools to study common phenomena in geophysical turbulent flows. In the atmosphere and the oceans, rotation and stratification result in a flow that can be approximated ...
Sign cancellation and scaling in the vertical component of velocity and vorticity in rotating turbulence
(Amer Physical Soc, 2013-07-18)
We study sign changes and scaling laws in the Cartesian components of
the velocity and vorticity of rotating turbulence, in the helicity, and
in the components of vertically averaged fields. Data for the analysis
are ...
The decay of turbulence in rotating flows
(American Institute of Physics, 2011-06)
We present a parametric space study of the decay of turbulence in rotating flows combining direct numerical simulations, large eddy simulations, and phenomenological theory. Several cases are considered: (1) the effect of ...
Effective diffusivity of passive scalars in rotating turbulence
(Amer Physical Soc, 2013-02-25)
We use direct numerical simulations to compute turbulent transport
coefficients for passive scalars in turbulent rotating flows. Effective
diffusion coefficients in the directions parallel and perpendicular to
the ...
Large-scale behavior and statistical equilibria in rotating flows
(American Physical Society, 2011-01)
We examine long-time properties of the ideal dynamics of three-dimensional flows, in the presence or not of an imposed solid-body rotation and with or without helicity (velocity-vorticity correlation). In all cases, the ...
Time-dependent mass-transfer behaviour under laminar and turbulent flow conditions in rotating electrodes: A CFD study with analytical and experimental validation
(Pergamon-Elsevier Science Ltd, 2019-07)
Results of numerical calculations and their comparison with analytical expressions or experimental data under laminar and turbulent flow conditions are reported. It is predicted the transient and steady-state behaviour of ...
Inverse cascades in rotating stratified turbulence: Fast growth of large scales
(IOP Publishing, 2013-05)
We examine the inverse cascade of kinetic energy to large scales in rotating stratified turbulence as occurs in the oceans and in the atmosphere, while varying the relative frequency of gravity to inertial waves, N/f. Using ...
Emergence of helicity in rotating stratified turbulence
(Amer Physical Soc, 2013-03)
We perform numerical simulations of decaying rotating stratified turbulence and show, in the Boussinesq framework, that helicity (velocity-vorticity correlation), as observed in supercell storms and hurricanes, is spontaneously ...