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8 papers · 1 filter
Scale interactions and scaling laws in rotating flows at moderate Rossby numbers and large Reynolds numbers
P. D. Mininni, A. Alexakis, A. Pouquet
The effect of rotation is considered to become important when the Rossby number is sufficiently small, as is the case in many geophysical and astrophysical flows. Here we present d…
Energy decay laws in strongly anisotropic MHD turbulence
Barbara Bigot, Sebastien Galtier, Helene Politano
We investigate the influence of a uniform magnetic field on energy decay laws in incompressible magnetohydrodynamic (MHD) turbulence. The nonlinear transfer red…
Non-local interactions in hydrodynamic turbulence at high Reynolds numbers: the slow emergence of scaling laws
P. D. Mininni, A. Alexakis, A. Pouquet
We analyze the data stemming from a forced incompressible hydrodynamic simulation on a grid of 2048^3 regularly spaced points, with a Taylor Reynolds number of Re~1300. The forcing…
Anisotropic fluxes and nonlocal interactions in MHD turbulence
A. Alexakis, B. Bigot, H. Politano
We investigate the locality or nonlocality of the energy transfer and of the spectral interactions involved in the cascade for decaying magnetohydrodynamic (MHD) flows in the prese…
Subcritical dynamo bifurcation in the Taylor Green flow
Yannick Ponty, Jean-Phillipe Laval, Berengere Dubrulle +2
We report direct numerical simulations of dynamo generation for flow generated using a Taylor-Green forcing. We find that the bifurcation is subcritical, and show its bifurcation d…
Spectral Modeling of Turbulent Flows and the Role of Helicity
Julien Baerenzung, Helene Politano, Yannick Ponty +1
We present a new version of a dynamical spectral model for Large Eddy Simulation based on the Eddy Damped Quasi Normal Markovian approximation \cite{sao,chollet_lesieur}. Three dis…