Dynamic mode decomposition of hairpin vortices generated by a hemisphere protuberance

Dynamic mode decomposition of hairpin vortices generated by a hemisphere protuberance
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半球突起产生的发夹涡的动态模态分解

DOI:
10.1007/s11433-011-4535-2
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发表时间:
2012
期刊:
Science in China Series G: Physics, Mechanics & Astronomy
影响因子:
--
通讯作者:
tang zhanqi
tang zhanqi
中科院分区:
其他
文献类型:
--
作者:
tang zhanqi

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利用二维时间分辨粒子图像测速技术(PIV)对水槽中半球形突起物产生的发夹涡进行了动态模态分解(DMD)研究。通过识别发夹结构的主频率和相关的空间结构来提取发夹结构的动态信息。对于这个准周期数据系统,产生的主要动力学模式说明了与尾涡区域和近壁区域相关的不同空间结构。通过与本征正交分解(POD)的比较,可以得出动态模式比POD确定的模式更有效地集中在某个频率分量上。在分析过程中,DMD被证明是一个强大的和可靠的算法来提取时空相干结构。
We present dynamic mode decomposition (DMD) for studying the hairpin vortices generated by hemisphere protuberance measured by two-dimensional (2D) time-resolved (TR) particle image velocimetry (PIV) in a water channel. The hairpins dynamic information is extracted by identifying their dominant frequencies and associated spatial structures. For this quasi-periodic data system, the resulting main Dynamic modes illustrate the different spatial structures associated with the wake vortex region and the near-wall region. By comparisons with proper orthogonal decomposition (POD), it can be concluded that the dynamic mode concentrates on a certain frequency component more effectively than the mode determined by POD. During the analysis, DMD has proven itself a robust and reliable algorithm to extract spatial-temporal coherent structures.
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影响因子: 2.4
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