On the Extraction of Long-living Features in Unsteady Fluid Flows
On the Extraction of Long-living Features in Unsteady Fluid Flows
复制标题
关于非稳态流体流动中长寿命特征的提取
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Hege
中科院分区：
文献类型：
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作者：
Jens Kasten;I. Hotz;B. R. Noack;H. Hege
本文提出二维时变流矢量场拓扑临界点的agilean不变推广。该方法基于拉格朗日对流体粒子运动的考虑。它提取长期存在的特征，如鞍和中心，并过滤掉短期存在的局部结构。这非常适合于分析湍流，其中标准快照拓扑产生难以管理的大量拓扑结构，这些拓扑结构几乎与概念流体力学模型中使用的几个主要长寿命特征无关。给出了周期涡和混沌涡运动的结果。
This paper proposes aGalilean invariant generalization of critical points ofvector field topology for 2D time-dependent flows. The approach is based upon a Lagrangian consideration of fluid particle motion. It extracts long-living features, likesaddles and centers, and filters out short-living local structures. This is well suited for analysis ofturbulent flow, where standard snapshot topology yields an unmanageable large number of topological structures that are barely related to the few main long-living features employed in conceptual fluid mechanics models. Results are shown for periodic and chaoticvortex motion.