Volume 38, Number 3, June 2020
|465 - 470
|06 August 2020
Aeroacoustic Noise Characteristics of Flow around a Square Column Based on Large Eddy Simulation
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
Large eddy simulation and Ffowcs Williams-Hawkings (FW-H) equation were used to investigate the aeroacoustic noise characteristics of flow around a square column. After verifying the accuracy of the numerical model, the influences of flow velocity and flow direction on noise field characteristics are discussed. The noise prediction result of the base model was in good agreement with the experiment data in the vortex-shedding frequency and in the general trend. It was shown that there were typical dipole noise sources in the direction of 110° and 250°, respectively. With the increase of distance, the total sound pressure level was decreased and the directionality of the noise field is becoming worse. The results showed that the vortex-shedding frequency was increased with the increase of flow velocity, and the corresponding sound pressure level was also raised. The change of flow direction would make the directionality of noise flied more complicated, which is related to the complexity of flow field.
Key words: flow around a square column / aerodynamic noise / large eddy simulation / acoustic analogy / dipole noise / sound pressure level / directionality
关键字 : 方柱扰流 / 气动噪声 / 大涡模拟 / 声类比 / 偶极子
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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