### Skapa referens, olika format (klipp och klistra)

**Harvard**

Moradi, S. och Anderson, J. (2016) *Phase dependent advection-diffusion in drift wave - zonal flow turbulence*.

** BibTeX **

@conference{

Moradi2016,

author={Moradi, Sara and Anderson, Johan},

title={Phase dependent advection-diffusion in drift wave - zonal flow turbulence},

booktitle={Proceedings of the 43rd EPS Conference on Plasma Physics, July 4-8, Leuven, Belgium 2016},

pages={P1.089},

abstract={In magnetically confined plasmas, drift wave turbulence is believed to be responsible for the
anomalous transport and the generation of inherent sheared zonal flows providing a self-regulating
mechanism that may control the turbulence itself. The coupled system of drift wave-zonal flow
(DW-ZF) is one of the key points in the evasive explanation of the low to high confinement
(L-H) transition in fusion plasmas. In plasma turbulence a large number of non-linearly interacting
modes are present which yield an enormous complexity and dynamic richness. However,
the nonlinear mode coupling processes allows for coherent structures (sheared flow, acoustic
modes, etc.) to be formed which can even grow in the presence of random fields or cascade
to smaller scales, this is a manifestation of the self-organization process with predator-prey dynamics.
A powerful and yet simple mathematical framework for describing the self-organisation
phenomena was developed by Kuramoto [1]. The Kuramoto model describes the phase dynamics
of a system of stochastic limit-cycle oscillators revolving at arbitrary intrinsic frequencies
and coupled through the sine of their phase differences. Furthermore, under certain conditions
they spontaneously lock into a common frequency. Most often in modelling, the dynamics of
the phases is neglected and the so-called random-phase approximation (RPA) is used. However,
one could expect that the phase dynamics can play a role in the self-organisation and the formation
of coherent structures. In this work we present a study on the importance of a collective
phase dynamic on the characteristic time evolution of the fluctuation energy and the formation
of coherent structures. The model is built on the stochastic passive advection-diffusion of
a scalar [2] while using the predator-prey model with stochastic oscillators representing the
DW-ZF interaction [3]. Our findings show the occurrence of modulational behaviour prior to
the synchronisation state, and that the synchronization of the phases can result in a significant
change in the dynamics of the fluctuation energy and the saturation state.},

year={2016},

}

** RefWorks **

RT Conference Proceedings

SR Electronic

ID 242336

A1 Moradi, Sara

A1 Anderson, Johan

T1 Phase dependent advection-diffusion in drift wave - zonal flow turbulence

YR 2016

T2 Proceedings of the 43rd EPS Conference on Plasma Physics, July 4-8, Leuven, Belgium 2016

AB In magnetically confined plasmas, drift wave turbulence is believed to be responsible for the
anomalous transport and the generation of inherent sheared zonal flows providing a self-regulating
mechanism that may control the turbulence itself. The coupled system of drift wave-zonal flow
(DW-ZF) is one of the key points in the evasive explanation of the low to high confinement
(L-H) transition in fusion plasmas. In plasma turbulence a large number of non-linearly interacting
modes are present which yield an enormous complexity and dynamic richness. However,
the nonlinear mode coupling processes allows for coherent structures (sheared flow, acoustic
modes, etc.) to be formed which can even grow in the presence of random fields or cascade
to smaller scales, this is a manifestation of the self-organization process with predator-prey dynamics.
A powerful and yet simple mathematical framework for describing the self-organisation
phenomena was developed by Kuramoto [1]. The Kuramoto model describes the phase dynamics
of a system of stochastic limit-cycle oscillators revolving at arbitrary intrinsic frequencies
and coupled through the sine of their phase differences. Furthermore, under certain conditions
they spontaneously lock into a common frequency. Most often in modelling, the dynamics of
the phases is neglected and the so-called random-phase approximation (RPA) is used. However,
one could expect that the phase dynamics can play a role in the self-organisation and the formation
of coherent structures. In this work we present a study on the importance of a collective
phase dynamic on the characteristic time evolution of the fluctuation energy and the formation
of coherent structures. The model is built on the stochastic passive advection-diffusion of
a scalar [2] while using the predator-prey model with stochastic oscillators representing the
DW-ZF interaction [3]. Our findings show the occurrence of modulational behaviour prior to
the synchronisation state, and that the synchronization of the phases can result in a significant
change in the dynamics of the fluctuation energy and the saturation state.

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/242336/local_242336.pdf

OL 30