Journal ArticleDOI
Prediction of flow induced sound generated by cross flow past finite length circular cylinders.
TLDR
Comparisons of numerical and anechoic wind tunnel measurements show good agreement in terms of the aerodynamic forces and acoustic parameters such as tonal frequency, tonalSound pressure level, and overall sound pressure level.Abstract:
The paper presents aeroacoustic results for the flow around finite-length circular cylinders at Reynolds number 84 770 for various length-to-diameter (L/D) ratios (= 3, 9, 20, 25, 30, and 35). The incompressible Navier-Stokes equations are solved using the large eddy simulation model of turbulence followed by acoustic predictions in the far field using Ffwocs Williams and Hawkings method. The comparisons of numerical and anechoic wind tunnel measurements show good agreement in terms of the aerodynamic forces and acoustic parameters such as tonal frequency, tonal sound pressure level, and overall sound pressure level. The cylinder L/D ratio was observed to be a significant parameter that controls vortex shedding and consequently the flow induced sound generation.read more
Citations
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Journal ArticleDOI
Impact of Rotor–Airframe Orientation on the Aerodynamic and Aeroacoustic Characteristics of Small Unmanned Aerial Systems
Zhenyu Wang,Quinten Henricks,Mei Zhuang,Anshuman Pandey,Mark L. Sutkowy,Braxton Harter,Matthew McCrink,James W. Gregory +7 more
TL;DR: A comprehensive analysis of the flow and acoustic features of a rotor–airframe system used on typical multirotor sUAS with the inclusion of said geometry is presented.
Journal ArticleDOI
Turbulent flow and noise sources on a circular cylinder in the critical regime
Stéphane Moreau,Marlène Sanjosé +1 more
TL;DR: In this article, the authors used a compressible wall-resolved large-eddy simulation (LES) for the first time to investigate the flow around a circular cylinder with long spanwise length.
Journal ArticleDOI
Small-Scale Rotor Design Variables and Their Effects on Aerodynamic and Aeroacoustic Performance of a Hovering Rotor
TL;DR: From the results, insights are provided for rotor designs that are more aerodynamically and acoustically efficient in hover, as rotors that provided lower values of disk loading and higher values of power loading were typically more acoustical efficient.
Journal ArticleDOI
Mitigation of aerodynamic sound for a laminar flow past a square cylinder using a pair of cowl plates
TL;DR: In this article, a new arrangement of splitter plates has been proposed for the mitigation of aeroacoustic noise generated by the two-dimensional laminar flow over a square cylinder at the Reynolds number Re = 100 and the Mach number M = 0.2.
Journal ArticleDOI
Optimization of wavy cylinder for aerodynamic drag and aeroacoustic sound reduction using computational fluid dynamics analysis
TL;DR: In this paper, a numerical analysis of the aerodynamic and aeroacoustics of the bluff bodies is presented, motivated by the requirement to lessen the aerodynamics and sound of the bluff bodies.
References
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A numerical study of three-dimensional turbulent channel flow at large Reynolds numbers
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