The role of negative energy waves in some instabilities of parallel flows
The role of negative energy waves in some instabilities of parallel flows
复制标题
负能量波在平行流某些不稳定性中的作用
DOI：
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发表时间：
1979
影响因子：
3.7
通讯作者：
R. A. Cairns
中科院分区：
文献类型：
--
作者：
R. A. Cairns
具有阶跃函数速度和密度分布的平行流可以支持具有负能量的波，从这个意义上说，激发它们会降低系统的总能量。由于正能量波和负能波的共存或负能量波的衰减，可能会发生一些不稳定性；讨论了一些具体的例子，以说明认识负能量波的这一作用如何使人们在进行任何详细分析之前就可以预测不稳定性的存在，并深入了解不稳定性的机制。
Parallel flows with step function velocity and density profiles can support waves which have negative energy, in the sense that exciting them lowers the total energy of the system. A number of instabilities can occur because of the coexistence of positive and negative energy waves, or because of the damping of negative energy waves; some particular examples are discussed to show how appreciation of this role of negative energy waves allows one to predict the existence of instability before doing any detailed analysis, and to gain insight into the instability mechanism.