A critical transition of two-dimensional flow in toroidal geometry

Wesley Agoua,Benjamin Favier, Jorge Morales,Wouter J.T. Bos

Journal of Fluid Mechanics(2024)

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摘要
We investigate two-dimensional (2-D) axisymmetric flow in toroidal geometry, with a focus on a transition between 2-D three-component flow and 2-D two-component flow. This latter flow state allows a self-organization of the system to a quiescent dynamics, characterized by long-living coherent structures. When these large-scale structures orient in the azimuthal direction, the radial transport is reduced. Such a transition, if it can be triggered in toroidally confined fusion plasmas, is beneficial for the generation of zonal flows and should consequently result in a flow field beneficial for confinement.
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