Nonlinear instabilities driven by coherent phase-space structures
Nonlinear instabilities driven by coherent phase-space structures
复制标题
由相干相空间结构驱动的非线性不稳定性
DOI：
10.1103/physreve.87.031101
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发表时间：
2012
影响因子：
2.4
通讯作者：
P. Diamond
中科院分区：
文献类型：
--
作者：
M. Lesur;P. Diamond
作者：Lesur，M; Diamond，PH|翻译后摘要：在波耗散的存在下，相空间结构出现在非线性弗拉索夫动力学。我们的理论给出了这些相干结构的增长和波能的增长之间的简单关系。结构可以通过直接的动量交换来驱动波，这解释了在几乎不稳定和线性稳定（亚临界）区域中存在非线性不稳定性。当耗散场方程中的线性项建模，简单的表达式的单孔增长率和初始扰动阈值是一致的数值模拟。© 2013美国物理学会。
Author(s): Lesur, M; Diamond, PH | Abstract: In the presence of wave dissipation, phase-space structures emerge in nonlinear Vlasov dynamics. Our theory gives a simple relation between the growth of these coherent structures and that of the wave energy. The structures can drive the wave by direct momentum exchange, which explains the existence of nonlinear instabilities in both barely unstable and linearly stable (subcritical) regimes. When dissipation is modeled by a linear term in the field equation, simple expressions of a single-hole growth rate and of the initial perturbation threshold are in agreement with numerical simulations. © 2013 American Physical Society.