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

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 × 105. 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.

Hybrid Computation of the Aerodynamic Noise Radiated by the Wake of a Subsonic Cylinder

“…Moreover, there are several studies that have used specific Re D in the subcritical regime with low Mach numbers (i.e., M < 0.2), such as those by Khalighi et al [24] or Orselli et al [33]. Other works in the literature focus on the study of different external conditions, such as the effect of the yaw angle in the radiated sound (see, for instance, E. Latorre Iglesias et al [34]), the influence of the cross-section shape on the aeolian tone [35], the possible noise reduction with the addition of porous media around the cylinder (such as Sueki et al [36] or Geyer et al [37]) and the effect of the cylinder oscillations on the radiated sound [38].…”