Shear flow effects on the nonlinear evolution of thermal instabilities
Shear flow effects on the nonlinear evolution of thermal instabilities
复制标题
剪切流对热不稳定性非线性演化的影响
DOI：
10.1063/1.860682
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
B. Carreras
中科院分区：
文献类型：
--
作者：
J. Leboeuf;L. Charlton;B. Carreras
在弱辐射驱动区，杂质辐射驱动的热不稳定性和自洽流型修正之间的耦合导致了一个可用Volterra-Lotka方程近似的简单动力学系统。在这个系统中，切变流是捕食者，温度波动是捕食者。解是振荡的，它们的行为类似于边缘局域模式(ELM)。将简化模型的解与三维和二维非线性数值结果进行了比较。
In the weak radiation drive regime, the coupling between the thermal instability driven by impurity radiation and the self‐consistent flow profile modification leads to a simple dynamical system that can be approximated by the Volterra–Lotka equations. In this system the shear flow acts as a predator and the temperature fluctuations act as prey. The solutions are oscillatory, and their behavior resembles that of edge‐localized modes (ELM’s). The solutions of the simplified model are compared with the three‐dimensional and two‐dimensional nonlinear numerical results for this instability.