Ganta Naveen, Mahato Bikash, Bhumkar Yogesh G
Scientific Computing Laboratory, School of Mechanical Sciences, Indian Institute of Technology, Bhubaneswar 752050, India.
J Acoust Soc Am. 2020 Jan;147(1):325. doi: 10.1121/10.0000585.
Analysis of sound generated due to a laminar flow past a circular cylinder subjected to the mean rotation along with the rotary oscillating motion has been performed for the Reynolds number Re = 150 and the Mach number M = 0.2. The direct numerical simulation approach has been used to study modifications in the generated sound field over a range of forcing parameters using disturbance pressure field information. Flow and sound fields are accurately resolved over a nondimensional radial distance r≤100 from the center of the cylinder. Frequencies, as well as wavelengths of generated sound waves, have been effectively altered by varying the forcing frequency-ratio, whereas the directivity nature of the radiated sound field has been modified by varying the forcing amplitude-ratio. Doak's decomposition technique has been used to understand the reasons behind changes in the radiated sound fields as the forcing parameters are varied.
针对雷诺数Re = 150和马赫数M = 0.2，对绕受平均旋转和旋转振荡运动作用的圆柱的层流所产生的声音进行了分析。采用直接数值模拟方法，利用扰动压力场信息研究了一系列强迫参数下所产生声场的变化。在距圆柱中心无量纲径向距离r≤100的范围内，流场和声场都得到了精确解析。通过改变强迫频率比，有效地改变了所产生声波的频率和波长，而通过改变强迫振幅比，改变了辐射声场的指向性特性。采用多克分解技术来理解随着强迫参数变化辐射声场变化背后的原因。
