TY  - EJOU
AU  - Shanmugam, A. R. 
AU  - Park, Ki Sun 

TI  - Numerical Investigation of Aeroacoustic Response of an Oscillating-Wing Power Extractor
T2  - Fluid Dynamics \& Materials Processing

PY  - 2026
VL  - 22
IS  - 7
SN  - 1555-2578

AB  - Oscillating-wing power extractors (OWPEs) are an alternative to rotary wind turbines for small- and medium-scale renewable energy applications. However, the aeroacoustic response of such systems remains largely unexplored. In this study, the power extraction performance and near-field aeroacoustic characteristics of an OWPE are numerically investigated using transient computational fluid dynamics (CFD) simulations coupled with the Ffowcs Williams–Hawkings (FW–H) acoustic model at a Reynolds number Re of 8.58 × 10<sup>4</sup>. Two important operating parameters, namely the pitching amplitude θ<sub>o</sub> and reduced frequency f*, are varied systematically, and the corresponding near-field sound pressure level (SPL) is measured at 20 receiver locations surrounding the OWPE. The results show that the reduced frequency f* has a strong influence on the near-field overall sound pressure level (OSPL), whereas the effect of pitching amplitude is comparatively less significant. Increasing the reduced frequency broadens the acoustic spectrum and increases the predicted near-field acoustic levels, while the acoustic response remains dominated by low-frequency components. Flow-field analysis reveals that the formation, growth, and shedding of the leading-edge vortex (LEV) strongly influence both the power extraction performance and the near-field aeroacoustic characteristics. The Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)-based multi-criteria analysis identified θ<sub>o</sub> = 80° and f* = 0.16 as the optimal operating condition, providing the best compromise between power extraction and near-field acoustic levels.
KW  - Acoustics; aerodynamic noise; flapping wing; oscillating wing; renewable energy; wind energy

DO  - 10.32604/fdmp.2026.086164