双圆柱绕流的数值模拟  

The Numerical Simulation of Flow around Two Circular Cylinders

作　　者：麻伟巍[1] 蒋运幸 余宇轩[2] 

机构地区：[1]东华大学理学院,上海201620 [2]复旦大学力学与工程科学系,上海200433

出　　处：《复旦学报（自然科学版）》2013年第5期592-600,共9页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金面上项目(11172069)资助

摘　　要：利用Fluent软件对双圆柱绕流进行三维数值模拟.通过设置监控点采集动态模拟信号,用快速傅里叶变换(FFT)及希尔伯特-黄变换(HHT)等方法分别对测量得到的尾流场脉动速度的雷诺应力、扩散项、压力应变率、耗散项、生成项进行分析,研究了不同项在尾流场中的作用.通过对脉动速度的傅里叶能谱和希尔伯特谱进行比较,得出此计算方法可以有效地掌握尾流场中的能量分布.A model is constructed to numerically simulate the flow around two circular cylinders in a threedimensional way based on Fluent. The dynamic data in an analog signal form is acquired by setting the surface points. Different terms （Reynolds stress, diffusion term, stress strain rate, dissipative term and generation term） of the fluctuation velocity acquired in the wake flow field are analyzed to find their effects by taking advantage of the Fast Fourier Transform （FFT） and Hilbert-Huang Transform （HHT） etc. By comparing the Fourier Spectrum and Hilhert Spectrum, results show that this computational method is an effective way to research the energy distribution in the wake.

关 键 词：FLUENT 双圆柱绕流 数值模拟 快速傅里叶变换(FFT) 希尔伯特一黄变换(HHT) 

分 类 号：O357[理学—流体力学]