中文摘要：

为了研究低流速下多体绕流激噪声,提出一种基于流声分解法的双圆柱绕流激噪声预报方法。在自主开发的通用流体力学数值模拟软件GTEA基础上,编写了双圆柱绕流噪声计算程序。采用单圆柱绕流噪声计算,验证了流声分解法的正确性和可靠性,对不同圆心距系数（圆柱间中心距与圆柱直径之比）S为1.1、1.7、3.0的并列双圆柱绕流和噪声进行了数值计算。研究表明：并列双圆柱绕流流场可分成单钝体绕流、混合绕流、稳定流3种形式,3种绕流形式对应3种不同声场,混合绕流的声场呈现多极子分布与单圆柱偶极子噪声分布有明显不同,流场分布形式直接决定声场分布形式。

英文摘要：

To advance the study of the flow-induced noise generated by low-speed flow passing multiple bodies,in this paper,we propose a Viscous / Acoustic splitting method for forecasting the noise induced by flow passing two cylinders. We use the general hydromechanics numerical simulation software GTEA,which is developed by the authors,to compile the calculation procedure for noise induced by flow passing around two cylinders. First,the software calculated the noise induced by flow passing a single cylinder to validate the accuracy and reliability of the Viscous / Acoustic splitting method. Then,it performed numerical calculations to determine the noise and two sideby-side circular cylinders,with the different circle center-to-center distance coefficients（ ratio of the cylinder center-to-center distance to the cylinder diameter） of S = 1.1,1.7,and 3.0. The results show that the flow field of a symmetrical two-cylinder streaming can be divided into single bluff-body streaming,mixing quasi-periodic streaming and stable anti-phase-synchronized streaming. These three streaming types correspond to three types of sound fields. The sound field of mixed streaming has a multi-pole distribution,and differs markedly from the dipole noise distribution of a single cylinder. The distribution of a flow field directly determines the distribution of the sound field.