Research on chaotic features of a flow field over a plunging airfoil based on dynamic mode decomposition
Yuhang Qi 1  
,   Wenqing Yang 1, 2,   Yue Wang 1,   Bifeng Song 1, 3
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School of Aeronautics, Northwestern Polytechnical University, Xi’an, China
Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, China
Yangtze River Delta Research Institute of Northwestern Polytechnical University, Taicang, China
Yuhang Qi   

School of Aeronautics, Northwestern Polytechnical University, China
Submission date: 2020-10-30
Final revision date: 2021-01-20
Acceptance date: 2021-02-22
Online publication date: 2021-04-11
Publication date: 2021-04-15
Journal of Theoretical and Applied Mechanics 2021;59(2):293–305
Periodic motion of a plunging airfoil causes continuous changes in the surrounding flow field. The time-dependent thrust coefficient depends entirely on unsteady characteristics of the flow field. On the contrary, the time-dependent thrust coefficient may also reflect the unsteady characteristics of the corresponding flow field. With the fast Fourier transform (FFT) and dynamic mode decomposition (DMD), unsteady aerodynamic forces can be correlated with the flow field characteristics in the frequency domain. In the present paper, DMD is performed to analyze the unsteady characteristics of the flow field around a plunging NACA0012 airfoil at the Reynolds number of 20 000.
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