Hybrid approach for simulating flow-induced sound around moving bodies based on ghost-cell immersed boundary method  

基于虚拟网格浸入边界法的运动物体流噪声混合模拟方法

作　　者：Cheng Zhao Hong-Gang Li Xue-Gang Li Yan Yang Kai Cui 赵成;李红钢;黎雪刚;杨焱;崔凯

机构地区：[1]Wuhan Second Ship Design and Research Institute,Wuhan 430205,China [2]LHD,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Acta Mechanica Sinica》2024年第12期15-28,共14页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52301380 and 11602277).

摘　　要：A hybrid approach based on the immersed boundary method(IBM)is developed for computation of flow-induced sound around moving bodies.In this method,a high-fidelity direct numerical simulation(DNS)solver is used to simulate the incompressible flow field.The sound field is predicted by discretizing acoustic perturbation equations(APEs)with dispersionrelation-preserving space scheme and low-dispersion and low-dissipation Runge-Kutta time integration.A sharp-interface IBM based on ghost-cell is implemented for present two-step DNS-APE approach to deal with complex moving bodies with Cartesian grids.The present method is validated through simulations of sound generation caused by flow past a rotating cylinder,an oscillating cylinder,and tandem oscillating and stationary cylinders.The sound generated by typical kinds of complicated bio-inspired locomotions,i.e.,flapping flight by wings of varied shapes and collective undulatory swimming in tandem,are investigated using present method.The results demonstrate potential of the hybrid approach in addressing flowinduced sound generation and propagation with complex moving boundaries in a fluid medium,especially for the sound characteristics of bio-mimetic flows,which might shed lights on investigations on bio-acoustics,ethology of complex animal system,and related bio-mimetic design for quietness.发展了基于浸入边界法的流噪声混合模拟方法,用于模拟运动体引起的流噪声.不可压流动采用高保真直接数值模拟(DNS)求解器;声传播方程(APE)用于模拟声场.其中后者采用色散关系保持空间格式和低色散低耗散龙格库塔时间格式.该DNS-APE两步法将基于虚拟单元的锐利界面浸入边界法应用在笛卡尔网格上处理复杂运动边界.验证算例包括旋转单圆柱、振荡单圆柱以及串联静止和振荡圆柱组合所产生的流噪声.研究了不同形状扑翼飞行运动和串联集群波状游动两种典型复杂仿生运动所产生的声场.本文展示了该高精度混合方法在模拟具有复杂运动边界的流动诱发的噪声产生和传播(声场)方面具备有效性,尤其是在预测生物或仿生机器所产生的流动噪声特性方面,可为动物声学、动物复杂系统行为学和相关仿生工程的低噪声设计等方面的研究和开发提供相关理论依据和概念.

关 键 词：Flow-induced sound Immersed boundary method Moving boundary Bio-inspired locomotion Computational aero/hydro-acoustics 

分 类 号：O35[理学—流体力学]