Adiabatic behavior of an elliptical vortex in a time-dependent external strain flow
Adiabatic behavior of an elliptical vortex in a time-dependent external strain flow
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DOI：
10.1103/physrevfluids.6.054703
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
N. Hurst;J. Danielson;D. Dubin;C. Surko
中科院分区：
文献类型：
--
作者：
N. Hurst;J. Danielson;D. Dubin;C. Surko
当涡补丁受到外部施加的应变流的应变率增长缓慢的时间，系统近似地保留了绝热不变量有关的振荡椭圆变形的旋涡。公式推导出这个不变的速率和函数形式的应变斜坡打破。分析结果进行了比较，使用磁化纯电子等离子体，这提供了一个密切的实验室实现的二维理想涡旋运动的实验数据。
When vortex patches are subjected to externally imposed strain flows where the strain rate grows slowly in time, the system approximately preserves an adiabatic invariant related to oscillatory elliptical deformations of the vortices. Formulae are derived for the breaking of this invariant with respect to the rate and functional form of the strain ramp. The analytical results are compared to experimental data acquired using magnetized pure electron plasmas, which provide a close laboratory realization of the motion of two-dimensional ideal vortices.