Role of density modulation in driving nonlinear streamer flows in drift wave turbulence
Role of density modulation in driving nonlinear streamer flows in drift wave turbulence
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DOI：
10.1063/1.5049726
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发表时间：
2018-10
影响因子：
2.2
通讯作者：
Y. Kosuga;K. Hasamada
中科院分区：
文献类型：
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作者：
Y. Kosuga;K. Hasamada
讨论了密度调制在漂移波湍流中驱动流注流的作用。与传统的剪切机制不同，我们强调了中尺度密度扰动对频率调制的影响。这一机制对拖缆比对纬向流更有效。计算了雷诺应力和非线性增长率。结果表明，密度调制增强了流注的生长。文中还讨论了流场的选择和纬向流的影响，以及密度调制在漂移波湍流中驱动流场的作用。与传统的剪切机制不同，我们强调了中尺度密度扰动对频率调制的影响。这一机制对拖缆比对纬向流更有效。计算了雷诺应力和非线性增长率。结果表明，密度调制增强了流注的生长。还讨论了对飘带和纬向流选择的影响。
The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.