Numerical Analysis of Aeroacoustic Characteristics around a Cylinder under Constant Amplitude Oscillation

Peixun Yu, Jiakuan Xu (), Heye Xiao and Junqiang Bai
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Peixun Yu: School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
Jiakuan Xu: School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
Heye Xiao: Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710129, China
Junqiang Bai: Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710129, China

Energies, 2022, vol. 15, issue 18, 1-21

Abstract: The present study numerically investigated a cylinder under oscillating motions at a low Reynolds number. The effects of two oscillation frequencies and amplitudes on the lift drag coefficient, near-field surface pressure fluctuation, and far-field noise were studied. The models were examined at a Mach number of 0.05, corresponding to a Reynolds number of 1.0 × 10 5 . In this paper, the incompressible Navier–Stokes equations (INSE) and linearized perturbed compressible equations (LPCE) were coupled to form a hybrid noise prediction method, which was used to solve the flow field and acoustic radiation field. Based on the simulation results of the acoustic radiation field, the frequency characteristics of the acoustic waves were analyzed by the dynamic modal decomposition (DMD) method. It was observed that when the oscillation amplitude was the same, the variation amplitude and mean value of the lift-drag coefficient increased with the increase in the oscillation frequency. Under the same small oscillation frequency, the oscillation amplitude had little effect on the lift-drag coefficient. However, for the same large oscillation frequency, the variation amplitude of the lift-drag coefficient increased as the oscillation amplitude increased. In addition, both the amplitude and frequency had a significant effect on the directionality of the noise and the intensity of the sound waves. The main energy of the sound field was mainly concentrated on the first and second narrowband frequencies by using the DMD method to analyze the sound pressure level spectrum.

Keywords: oscillating motions; low Reynolds number; linearized perturbed compressible equations; aerodynamic; aeroacoustic; dynamic mode decomposition method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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