Radial Spreading of Drift-Wave-Zonal-Flow Turbulence via Soliton Formation
Radial Spreading of Drift-Wave-Zonal-Flow Turbulence via Soliton Formation
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DOI：
10.1103/physrevlett.103.055002
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发表时间：
2009-07-31
影响因子：
8.6
通讯作者：
Zonca, Fulvio
中科院分区：
文献类型：
--
作者：
Guo, Zehua;Chen, Liu;Zonca, Fulvio
在平板模型中，研究了漂移波径向包络和纬向流振幅的自洽时空演化。耦合偏微分方程组在简单极限下的定常解产生了DW-ZF孤子结构，这些孤子结构的传播速度取决于包络峰值的幅值。由于线性增长或衰减、耗散、平衡不均匀和孤子动力学的影响，还可以观察到其他有趣的物理现象，例如孤子的产生、破坏、碰撞和反射，以及湍流爆发。孤子的传播导致了DW湍流的显著径向扩展，因此可以通过加宽湍流区来影响输运尺度随系统尺寸的变化。文中还讨论了本文的分析与环形几何中DW-ZF相互作用的描述的一致性。
The self-consistent spatiotemporal evolution of a drift-wave (DW) radial envelope and a zonal-flow (ZF) amplitude is investigated in a slab model. The stationary solution of the coupled partial differential equations in a simple limit yields the formation of DW-ZF soliton structures, which propagate radially with speed depending on the envelope peak amplitude. Additional interesting physics, e. g., the generation, destruction, collision, and reflection of solitons, as well as turbulence bursting can also be observed due to the effects of linear growth or damping, dissipation, equilibrium nonuniformities and soliton dynamics. The propagation of soliton causes significant radial spreading of DW turbulence and therefore can affect transport scaling with the system size by broadening of the turbulent region. The correspondence of the present analysis with the description of DW-ZF interactions in toroidal geometry is also discussed.