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首页> 外文期刊>Discrete and continuous dynamical systems▼hSeries S >MESOCHRONIC CLASSIFICATION OF TRAJECTORIES IN INCOMPRESSIBLE 3D VECTOR FIELDS OVER FINITE TIMES
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MESOCHRONIC CLASSIFICATION OF TRAJECTORIES IN INCOMPRESSIBLE 3D VECTOR FIELDS OVER FINITE TIMES

机译:有限时间上不可压缩3D向量场中的轨迹的亚同步分类

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The mesochronic velocity is the average of the velocity field along trajectories generated by the same velocity field over a time interval of finite duration. In this paper we classify initial conditions of trajectories evolving in incompressible vector fields according to the character of motion of material around the trajectory. In particular, we provide calculations that can be used to determine the number of expanding directions and the presence of rotation from the characteristic polynomial of the Jacobian matrix of meso-chronic velocity. In doing so, we show that (a) the mesochronic velocity can be used to characterize dynamical deformation of three-dimensional volumes, (b) the resulting mesochronic analysis is a finite-time extension of the Okubo-Weiss-Chong analysis of incompressible velocity fields, (c) the two-dimensional mesochronic analysis from Mezić et al. "A New Mixing Diagnostic and Gulf Oil Spill Movement", Science 330, (2010), 486—489, extends to three-dimensional state spaces. Theoretical considerations are further supported by numerical computations performed for a dynamical system arising in fluid mechanics, the unsteady Arnold-Beltrami-Childress (ABC) flow.
机译:中时速度是在有限持续时间的时间间隔内沿相同速度场生成的轨迹沿速度场的平均值。在本文中,我们根据材料围绕轨迹运动的特性,对在不可压缩矢量场中演化的轨迹的初始条件进行了分类。特别是,我们提供了可用于根据中时速度的雅可比矩阵的特征多项式来确定扩展方向的数量和旋转的存在的计算。这样做,我们表明(a)中时速度可用于表征三维体积的动态变形,(b)所得的中时分析是Okubo-Weiss-Chong分析不可压缩速度的有限时间扩展(c)来自Mezić等人的二维中时分析。 “新的混合诊断和海湾溢油运动”,科学330,(2010年),486-489,扩展到三维状态空间。理论上的考虑还可以通过对流体力学中的动力系统(非稳态Arnold-Beltrami-Childress(ABC)流动)进行的数值计算来进一步支持。

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