Dynamic mode decomposition of hairpin vortices generated by a hemisphere protuberance
Dynamic mode decomposition of hairpin vortices generated by a hemisphere protuberance
复制标题
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:
影响因子:
--
通讯作者:
tang zhanqi
中科院分区:
文献类型:
--
作者:
tang zhanqi
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:
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DOI:
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发表时间:
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期刊:
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影响因子:
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期刊:
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作者:
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