Generic mechanism of microturbulence suppression by vortex flows.
Generic mechanism of microturbulence suppression by vortex flows.
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DOI：
10.1103/physrevlett.103.015004
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发表时间：
2009-07
影响因子：
8.6
通讯作者：
Z. X. Wang;J. Li;J. Dong;Y. Kishimoto
中科院分区：
文献类型：
--
作者：
Z. X. Wang;J. Li;J. Dong;Y. Kishimoto
采用回转流体模拟方法对二维涡流与微湍流的相互作用进行了数值研究。结果表明，定性不同于通常的平均流，涡流可以显着抑制微湍流，即使在弱流动剪切。一个通用的抑制机制被确定为径向和极向模式耦合，诱导形成一个新的全球模式的倍增效应。此外，还发现涡与微湍流的相互作用形成了振荡的带状流。
The interaction between two-dimensional vortex flows and microturbulence is studied numerically using gyrofluid simulations. It is shown that, qualitatively different from usual mean flows, vortex flows can dramatically suppress microturbulence even with weak flow shear. A generic suppression mechanism is identified as the multiplied effect of both radial and poloidal mode couplings, which induce the formation of a new global mode. Furthermore, an oscillatory zonal flow is found to form through interaction between the vortex flows and microturbulence.