Since 1963
ARTICLE
Research on chaotic features of a flow field over a plunging airfoil based on dynamic mode decomposition
| 1 | School of Aeronautics, Northwestern Polytechnical University, Xi’an, China |
| 2 | Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, China |
| 3 | Yangtze River Delta Research Institute of Northwestern Polytechnical University, Taicang, China |
CORRESPONDING AUTHOR
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
KEYWORDS
TOPICS
ABSTRACT
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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