Far-field Aeroacoustic Noise Prediction of a Tall Standard Building Model by Measuring Unsteady Surface Pressures

Document Type : Research Article

Authors

1 University of Yazd

2 Mech. Eng. Dept, Faculty of Engineering, Yazd University, IRAN

3 Malek Ashtar University of Technology

Abstract

In the present study, far-field aeroacoustic noise emitted due to the air flow over a standard tall building model at different angles of attack is investigated. The purpose of this study is to estimate the far-field aeroacoustic noise emitted by measuring the unsteady surface pressures. The surface pressure data are used as input of a numerical algorithm which is written to solve the Ffowcs Williams and Hawkings equation. The aerodynamic and aeroacoustic characteristics of flow over a twodimensional square cyliner (for algorithm validation) and the main model are presented. The results revealed that the peak of vortex shedding frequency could be observed in the spectrum of surface pressure signals of sensors located on the side surfaces of the model. Its frequency is in an excellent agreement with the signals captured by hot wire measurement. The Strouhal number changes in the range of 0.08-0.1 depending on the angle of attack. Dipole pattern for sound radiation was also observed for three-dimensional model which is related to the vortex shedding phenomenon. The sound pressure level increases with increasing upstream velocity and decreases with distance from the model. The effect of angle of attack is also dependent on the reciever’s location.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 7
October 2020
Pages 1885-1904

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