6 papers
On Phase Transition of ITG Turbulence in the Dimits shift
L. N. Marquant, P. Morel, Ã. D. Gürcan
The transition between turbulent and zonal flow dominated states is investigated by varying the ion temperature gradient in nonlinear gyrokinetic simulations. Independent gradient…
Anisotropic truncation for turbulent transport and zonal flows in the Hasegawa-Wakatani system
Pierre L. Guillon, Robin Angles, Yanick Sarazin +2
Reduced models based on an anisotropic truncation of the Fourier space, retaining only a few poloidal wave-numbers while keeping the full radial resolution, are developed and first…
Nonlinear phase synchronization and the role of spacing in shell models
Lorenzo Manfredini, Ãzgür D. Gürcan
A shell model can be considered as a chain of triads, where each triad can be interpreted as a nonlinear oscillator that can be mapped to a spinning top. Investigating the relation…
Self-organisation through layering of -plane like turbulence in plasmas and geophysical fluids
P. L. Guillon, G. Dif-Pradalier, Y. Sarazin +2
Staircase formation and layering is studied in simplified, potential vorticity conserving models of plasmas and geophysical fluids, by investigating turbulent self-organisation and…
Shell Models on Recurrent Sequences: Fibonacci, Padovan and Other Series
Lorenzo Manfredini, Ãzgür D. Gürcan
A new class of shell models is proposed, where the shell variables are defined on a recurrent sequence of integer wave-numbers such as the Fibonacci or the Padovan series, or their…
Phase Transition From Turbulence To Zonal Flows In The Hasegawa-Wakatani System
Pierre L. Guillon, Ãzgür D. Gürcan
The transition between two-dimensional hydrodynamic turbulence and quasi-one-dimensional zonostrophic turbulence is examined in the modified Hasegawa-Wakatani system, which is cons…