Dynamical mode decomposition of Gurney flap wake flow
Dynamical mode decomposition of Gurney flap wake flow
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DOI：
10.1063/2.1101202
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发表时间：
2011
影响因子：
3.4
通讯作者：
C. Pan;D. Yu;Jinjun Wang
中科院分区：
文献类型：
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作者：
C. Pan;D. Yu;Jinjun Wang
本文采用动态模态分解（DMD）方法对带有Gurney襟翼的NACA0015翼型的尾迹流场进行了分析。首先介绍了DMD的物理特性。然后将PIV测量的尾流速度场分解为动力学模态。利用频率、波长和对流速度等丰富的信息，捕捉到了尾缘后的旋涡脱落模式及其高次谐波。结果表明，高阶动力学模式的对流速度比低阶模式快，而且动力学模式的波长与相应的频率成幂律关系。
The present work uses dynamic mode decomposition (DMD) to analyze wake flow of NACA0015 airfoil with Gurney flap. The physics of DMD is first introduced. Then the PIV-measured wake flow velocity field is decomposed into dynamical modes. The vortex shedding pattern behind the trailing edge and its high-order harmonics have been captured with abundant information such as frequency, wavelength and convection speed. It is observed that high-order dynamic modes convect faster than low-order modes; moreover the wavelength of the dynamic modes scales with the corresponding frequency in power law.