TY - GEN
T1 - Aeroacoustic Analysis of a NACA0012 Airfoil at a Moderate Reynolds Number Using Direct Noise Simulation
AU - Li, Tao
AU - Ankair, Maimaitituerxun
AU - Ma, Ruixian
AU - Liao, Mingfu
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2026.
PY - 2026
Y1 - 2026
N2 - At moderate Reynolds numbers, airfoils are prone to generate intense tonal noise, leading to a significant increase in airfoil-radiated sound level. In order to have a deeper understanding on the generation mechanism of tonal noise, this paper investigates the generation and propagation features of the tonal noise waves radiated by a two-dimensional NACA0012 airfoil using Direct Noise Simulation method. The simulated Reynolds number is 2.31 × 105 in conjunction with an attack angle of two degree. The unsteady flow phenomena around the airfoil and the evolution process of sound waves both in the time and space domains are analyzed systematically. Through Proper Orthogonal Decomposition (POD), the dominant flow field modes at this angle of attack are extracted, and the contribution of primary flow structures to acoustic radiation is quantitatively evaluated. Results indicate that the unsteady flow structures near the trailing edge serve as the critical factor in tonal noise generation. The mechanistic insights derived from this study establish a foundation for developing targeted control strategies directed at dominant coherent flow structures, thereby enabling optimization of flow characteristics and suppression of noise generation and propagation.
AB - At moderate Reynolds numbers, airfoils are prone to generate intense tonal noise, leading to a significant increase in airfoil-radiated sound level. In order to have a deeper understanding on the generation mechanism of tonal noise, this paper investigates the generation and propagation features of the tonal noise waves radiated by a two-dimensional NACA0012 airfoil using Direct Noise Simulation method. The simulated Reynolds number is 2.31 × 105 in conjunction with an attack angle of two degree. The unsteady flow phenomena around the airfoil and the evolution process of sound waves both in the time and space domains are analyzed systematically. Through Proper Orthogonal Decomposition (POD), the dominant flow field modes at this angle of attack are extracted, and the contribution of primary flow structures to acoustic radiation is quantitatively evaluated. Results indicate that the unsteady flow structures near the trailing edge serve as the critical factor in tonal noise generation. The mechanistic insights derived from this study establish a foundation for developing targeted control strategies directed at dominant coherent flow structures, thereby enabling optimization of flow characteristics and suppression of noise generation and propagation.
KW - large eddy simulation(LES)
KW - moderate Reynolds number
KW - proper orthogonal decomposition (POD)
KW - Tonal noise
UR - https://www.scopus.com/pages/publications/105036989496
U2 - 10.1007/978-981-95-7322-6_7
DO - 10.1007/978-981-95-7322-6_7
M3 - 会议稿件
AN - SCOPUS:105036989496
SN - 9789819573219
T3 - Lecture Notes in Electrical Engineering
SP - 90
EP - 105
BT - Advances in Applied Nonlinear Dynamics, Vibration, and Control - 2025 - The Proceedings of 2025 International Conference on Applied Nonlinear Dynamics, Vibration, and Control ICANDVC-2025
A2 - Jing, Xingjian
A2 - Ding, Hu
A2 - Yan, Bo
PB - Springer Science and Business Media Deutschland GmbH
T2 - International Conference on Applied Nonlinear Dynamics, Vibration and Control, ICANDVC 2025
Y2 - 17 October 2025 through 19 October 2025
ER -