Numerical Simulation Study of Aerodynamic Noise in High-Rise Buildings
Round 1
Reviewer 1 Report
The paper numerically simulated the sound pressure field on the surface of a high-rise building using the large eddy simulation method combined with the acoustic analog method of FW-H equation and obtained the intensity radiation distribution of sound pressure on the building to further identify the area with the maximum sound pressure intensity of the noise radiation and thus achieve the purpose of locating noise source. Several minor issues are as follows.
1. The scale size of the building model is 1:1500. Will the scale size affect the pressure distribution and also the intensity radiation distribution.
2. The flow around the building is advised to be added.
3. In Section 6, the numerical results were compared with the wind tunnel experimental results. It shows a good agreement in the middle and high frequency bands in terms of sound pressure level spectrum, however with a considerable difference in the low frequency band of 0-5000 Hz. The deviation should be explained.
Author Response
Point 1:The scale size of the building model is 1:1500. Will the scale size affect the pressure distribution and also the intensity radiation distribution.
Response 1:By acoustic similarity study, the scale change of the model, under the same acoustic similarity rule, does not have a significant effect on the sound pressure distribution.
Point 2:The flow around the building is advised to be added.
Response 2:Do you mean to obtain the flow field conditions around the building model through PIV experiment? We will consider your suggestion carefully in the follow-up study.
Point 3:In Section 6, the numerical results were compared with the wind tunnel experimental results. It shows a good agreement in the middle and high frequency bands in terms of sound pressure level spectrum, however with a considerable difference in the low frequency band of 0-5000 Hz. The deviation should be explained.
Response 3:In Section 5, we have analyzed and explained the deviation that occured from 0-5000 Hz. This part of the difference is due to the fact that the acoustic wind tunnel experiments have the unavoidable background noise in the wind tunnel, which does not exist in the numerical simulation.
Reviewer 2 Report
Introduction and background require more recent references.
The measurement setup is not clearly specified. it is useful for the repeatability of the method.
No residual chamber noise measurements are specified in absence of the sample. They are useful for understanding and reading the results
The results and conclusions should be improved to better highlight why the work is original and what new information it produces for the scientific community. In its present form it seems only an exercise of theoretical application and measurement.
Author Response
Point 1:Introduction and background require more recent references.
Response 1:
Aihara, Aya [31] et al. investigated the numerical prediction of aerodynamic noise of a vertical axis wind turbine using large eddy simulation and acoustic analogy and validated it by comparing it with measured results.Hamiga, WM [32] et al. used computational fluid dynamics (CFD) methods two turbulence models, namely k - omega shear stress transport (SST) and large eddy simulation (LES) to determine drag coefficients and lift forces. The Ffowcs Williams-Hawkings (FW-H) analogy was then applied to determine the distribution of sound pressure levels generated by moving vehicles and vehicle columnsThe developed model is also verified by comparing with the experimental results of acoustic field measurements.Angelino, M [33] et al. studied the noise radiated by a high subsonic turbulent jet using large eddy simulations and FW-H. A Fourier decomposition of the pressure near-field was performed to help determine the location of the source region and the main propagation direction.Karthik, K et al [34] used a combination of large eddy simulation (LES) and Ffowcs Williams to numerically investigate the drag and flow-induced sound reduction in a cylinder equipped with a manifold.Chen, NS et al [35] used the large eddy simulation (LES) method and the delayed separated eddy simulation (DDES) method in combination with the Ffowcs Williams and Hawkings (FW-H) analogies, respectively, to predict the self-noise of the NACA 65(12)-10 wing at low to moderate Reynolds numbers, and the LES method allows better prediction of broadband noise at different incidence conditions.
[31]Aihara, A,Bolin, K , Goude, A , Bernhoff, H .Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation[J].INTERNATIONAL JOURNAL OF AEROACOUSTICS,2021,20(8):959-978.
[32]Hamiga, WM , Ciesielka, WB .Numerical Analysis of Aeroacoustic Phenomena Generated by Heterogeneous Column of Vehicles[J].ENERGIES,2022,15(13).
[33]Angelino, M; Xia, H and Page, GJ.Influence of grid resolution on the spectral characteristics of noise radiated from turbulent jets: Sound pressure fields and their decomposition[J].COMPUTERS & FLUIDS,2020,196.
[34]Karthik, K, Vishnu, M, Vengadesan, S , Bhattacharyya, SK .Optimization of bluff bodies for aerodynamic drag and sound reduction using CFD analysis[J].JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS,2018,174:133-140.
[35]Chen, NS,Liu, HR , Liu, Q , Zhao, XY , Wang, YG .Effects and mechanisms of LES and DDES method on airfoil self-noise prediction at low to moderate Reynolds numbers[J].AIP ADVANCES,2021,11(2).
Point 2:The measurement setup is not clearly specified. it is useful for the repeatability of the method.
Response 2:Because this paper focuses on the feasibility study of numerical simulation in the aerodynamic noise of high-rise buildings, the main focus is on the specific settings of the numerical simulation, and the experimental results of the wind tunnel are only to verify the accuracy of the numerical simulation. The measurement parameter settings of the acoustic wind tunnel will be considered for a more detailed description in the specific experimental research paper of the acoustic wind tunnel.
Point 3:No residual chamber noise measurements are specified in absence of the sample. They are useful for understanding and reading the results.
Response 3:In the fifth part of the paper, we measured the aerodynamic noise without placing the model and analyzed the experimental results in comparison with the case of placing the model.
Point 4:The results and conclusions should be improved to better highlight why the work is original and what new information it produces for the scientific community. In its present form it seems only an exercise of theoretical application and measurement.
Response 4:
To provide some theoretical basis for the research on the localization of aerodynamic noise radiation sources of full-scale building models and the control methods of aerodynamic noise on the surface of high-rise buildings.The combination of numerical simulation and acoustic wind tunnel experiments is used for the first time in the study of aerodynamic noise in high-rise buildings.The method of numerical simulation for locating noise sources was applied to the study of locating noise sources on the surface of high-rise buildings firstly.Numerical simulation research on the surface aerodynamic noise of building models can optimize the appearance of high-rise buildings in the architectural design stage, and locate the existing high-rise building surface aerodynamic noise sources, more accurate and effective local noise reduction research processing, saving resources, reducing urban environmental noise pollution, and optimizing the living environment.
Round 2
Reviewer 2 Report
The work, in my opinion, in general is not particularly interesting. it is a well done application and the work is clearly presented