Numerical Investigation on Aerodynamic Noise of Flow past a Cylinder with Different Spanwise Lengths

Guanjiang Chen; B. Zang; Mahdi Azarpeyvand

doi:10.1063/5.0139731

Numerical Investigation on Aerodynamic Noise of Flow past a Cylinder with Different Spanwise Lengths

Guanjiang Chen, B. Zang^*, Mahdi Azarpeyvand

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

A numerical investigation is conducted on aerodynamic noise of flow past a circular cylinder with different spanwise lengths (0.5pD, pD, 2pD, 4pD) at Re = 10;000, where D is the diameter of the cylinder. The near-field pressure and velocity fields are predicted through Large Eddy Simulation (LES), then the acoustic analogy is used to obtain the far-field noise. The results show good agreements for both the near- and far-field with the data from in-house
experiments and the literature. Though the spanwise length has limited influence on the power spectral density of the near-field velocity and pressure fluctuations at different spanwise locations, substantial differences are observed for the spanwise pressure coherence and near-wake structures. The 0.5pD case shows primarily two-dimensional flow features immediately behind the cylinder compared to the other three cases, resulting in the overprediction of the spanwise pressure coherence, which has strong implications for the far-field noise prediction. With the spanwise length correction, the differences in overall noise magnitudes of the different cases diminish. Nevertheless, the 2pD and 4pD
cases better capture the first and second harmonics of the vortex shedding and its associated directivities than the other two cases, showing the importance of sufficient spanwise lengths in predicting noise from flow past a cylinder.

Original language	English
Article number	035128
Journal	Physics of Fluids
Volume	35
Issue number	3
Early online date	26 Feb 2023
DOIs	https://doi.org/10.1063/5.0139731
Publication status	Published - 17 Mar 2023

Bibliographical note

Funding Information:
The authors acknowledge the Advanced Computing Research Center (ACRC) of the University of Bristol. The first author's Ph.D. grant is funded by the China Scholarship Council (CSC)-University of Bristol (UoB) Ph.D. Scholarship (Funding No. CSC201906230299).

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© 2023 Author(s).

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abstract = "A numerical investigation is conducted on aerodynamic noise of flow past a circular cylinder with different spanwise lengths (0.5pD, pD, 2pD, 4pD) at Re = 10;000, where D is the diameter of the cylinder. The near-field pressure and velocity fields are predicted through Large Eddy Simulation (LES), then the acoustic analogy is used to obtain the far-field noise. The results show good agreements for both the near- and far-field with the data from in-houseexperiments and the literature. Though the spanwise length has limited influence on the power spectral density of the near-field velocity and pressure fluctuations at different spanwise locations, substantial differences are observed for the spanwise pressure coherence and near-wake structures. The 0.5pD case shows primarily two-dimensional flow features immediately behind the cylinder compared to the other three cases, resulting in the overprediction of the spanwise pressure coherence, which has strong implications for the far-field noise prediction. With the spanwise length correction, the differences in overall noise magnitudes of the different cases diminish. Nevertheless, the 2pD and 4pDcases better capture the first and second harmonics of the vortex shedding and its associated directivities than the other two cases, showing the importance of sufficient spanwise lengths in predicting noise from flow past a cylinder.",

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note = "Funding Information: The authors acknowledge the Advanced Computing Research Center (ACRC) of the University of Bristol. The first author's Ph.D. grant is funded by the China Scholarship Council (CSC)-University of Bristol (UoB) Ph.D. Scholarship (Funding No. CSC201906230299). Publisher Copyright: {\textcopyright} 2023 Author(s).",

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AU - Azarpeyvand, Mahdi

N1 - Funding Information: The authors acknowledge the Advanced Computing Research Center (ACRC) of the University of Bristol. The first author's Ph.D. grant is funded by the China Scholarship Council (CSC)-University of Bristol (UoB) Ph.D. Scholarship (Funding No. CSC201906230299). Publisher Copyright: © 2023 Author(s).

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N2 - A numerical investigation is conducted on aerodynamic noise of flow past a circular cylinder with different spanwise lengths (0.5pD, pD, 2pD, 4pD) at Re = 10;000, where D is the diameter of the cylinder. The near-field pressure and velocity fields are predicted through Large Eddy Simulation (LES), then the acoustic analogy is used to obtain the far-field noise. The results show good agreements for both the near- and far-field with the data from in-houseexperiments and the literature. Though the spanwise length has limited influence on the power spectral density of the near-field velocity and pressure fluctuations at different spanwise locations, substantial differences are observed for the spanwise pressure coherence and near-wake structures. The 0.5pD case shows primarily two-dimensional flow features immediately behind the cylinder compared to the other three cases, resulting in the overprediction of the spanwise pressure coherence, which has strong implications for the far-field noise prediction. With the spanwise length correction, the differences in overall noise magnitudes of the different cases diminish. Nevertheless, the 2pD and 4pDcases better capture the first and second harmonics of the vortex shedding and its associated directivities than the other two cases, showing the importance of sufficient spanwise lengths in predicting noise from flow past a cylinder.

AB - A numerical investigation is conducted on aerodynamic noise of flow past a circular cylinder with different spanwise lengths (0.5pD, pD, 2pD, 4pD) at Re = 10;000, where D is the diameter of the cylinder. The near-field pressure and velocity fields are predicted through Large Eddy Simulation (LES), then the acoustic analogy is used to obtain the far-field noise. The results show good agreements for both the near- and far-field with the data from in-houseexperiments and the literature. Though the spanwise length has limited influence on the power spectral density of the near-field velocity and pressure fluctuations at different spanwise locations, substantial differences are observed for the spanwise pressure coherence and near-wake structures. The 0.5pD case shows primarily two-dimensional flow features immediately behind the cylinder compared to the other three cases, resulting in the overprediction of the spanwise pressure coherence, which has strong implications for the far-field noise prediction. With the spanwise length correction, the differences in overall noise magnitudes of the different cases diminish. Nevertheless, the 2pD and 4pDcases better capture the first and second harmonics of the vortex shedding and its associated directivities than the other two cases, showing the importance of sufficient spanwise lengths in predicting noise from flow past a cylinder.

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DO - 10.1063/5.0139731

M3 - Article (Academic Journal)

SN - 1070-6631

VL - 35

JO - Physics of Fluids

JF - Physics of Fluids

IS - 3

M1 - 035128

ER -

Numerical Investigation on Aerodynamic Noise of Flow past a Cylinder with Different Spanwise Lengths

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