RESEARCH on CHAOTIC FEATURES of A FLOW FIELD over A PLUNGING AIRFOIL BASED on DYNAMIC MODE DECOMPOSITION

Yuhang Qi; Wenqing Yang; Yue Wang; Bifeng Song

doi:10.15632/JTAM-PL/134803

RESEARCH on CHAOTIC FEATURES of A FLOW FIELD over A PLUNGING AIRFOIL BASED on DYNAMIC MODE DECOMPOSITION

Yuhang Qi, Wenqing Yang, Yue Wang, Bifeng Song

School of Aeronautics

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English
Pages (from-to)	293-305
Number of pages	13
Journal	Journal of Theoretical and Applied Mechanics (Poland)
Volume	59
Issue number	2
DOIs	https://doi.org/10.15632/JTAM-PL/134803
State	Published - 2021

Keywords

Chaotic flow
Dynamic mode decomposition
Irregularity
Plunging airfoil
Thrust characteristic

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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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AU - Wang, Yue

AU - Song, Bifeng

PY - 2021

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AB - 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.

KW - Chaotic flow

KW - Dynamic mode decomposition

KW - Irregularity

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RESEARCH on CHAOTIC FEATURES of A FLOW FIELD over A PLUNGING AIRFOIL BASED on DYNAMIC MODE DECOMPOSITION

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Keywords

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