Karthik K, Vengadesan S, Bhattacharyya S K
Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India.
J Acoust Soc Am. 2018 Jan;143(1):260. doi: 10.1121/1.5021243.
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.
本文给出了雷诺数为84770时，不同长径比（L/D = 3、9、20、25、30和35）的有限长圆柱体绕流的气动声学结果。采用湍流大涡模拟模型求解不可压缩纳维-斯托克斯方程，随后使用Ffwocs Williams和Hawkings方法对远场进行声学预测。数值模拟结果与消声风洞测量结果在气动力和声学参数（如音调频率、音调声压级和总声压级）方面显示出良好的一致性。研究发现，圆柱体的长径比是控制涡旋脱落以及由此产生的流动诱导声的一个重要参数。
