【作者】 陈宗广； 郭鹏；

【Author】 CHEN Zong-guang~1,GUO Peng~2 (1.School of Mathematics and Physics,Lanzhou Jiaotong University,Lanzhou 730070,China)

【机构】 兰州交通大学数理学院；

【摘要】 以Lighthill声类比原理为基础,采用计算流体力学(CFD)结合声学有限元方法(BEM)的混合方法数值模拟了二维圆柱绕流的流场和气动噪声。流场模拟得到了速度、压力等物理参量随时间的变化值,并观察到了明显的紊流现象。声场模拟得到了计算域内的声场空间分布和监测点的声压级。观察声压级频谱曲线发现圆柱绕流噪声主要分布在低频范围,同时在频率120Hz处有一个峰值,通过分析发现这正是涡旋周期性脱落的频率。采用混合方法计算圆柱绕流噪声能获得流场和声场的准确信息,且耗费计算较少,是切实可行的。更多还原

【Abstract】 According to Light hill’s Analogy,Flow field and aerodynamic noise induced by flow around a 2D circular cylinder is numerical simulated using hybrid method which combines CFD and BEM.Velocity,pressure and other physical quantities of the flow field are acquired through CFD.Apparent turbulence within the computation domain is observed in the contours.Sound pressure level of all sound source domain and several far field points are computed.The results indicate that the sound pressure level spectra are prominent in low frequency range with a peak at 120Hz which is exactly the vortex shedding frequency.Flow and acoustical field information can be accurate captured by the hybrid computation method.It is turn on to be consuming less computation sources and as a result practical.更多还原