低雷诺数圆柱绕流数值模拟及控制措施  

Numerical Simulation and Control Measures of Flow Around Circular Cylinders at Low Reynolds Number

作　　者：白桦[1] 李加武[1] 夏勇[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《建筑科学与工程学报》2010年第4期39-43,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50578014)

摘　　要：采用层流模型并结合合理的网格划分模拟了低雷诺数圆柱绕流,使用FLUENT软件模拟了圆柱表面涡脱的产生、发展变化过程;计算了圆柱表面周向压力系数分布情况及圆柱的阻力系数、升力系数和Strouhal数;为研究圆柱绕流的控制措施,引入不同导流板进行数值计算。分析结果表明:在圆柱尾部中轴线位置引入导流板可以很好地控制圆柱表面涡脱,减小阻力,抑制振动;各系数计算结果与文献中的结果吻合很好,该方法具有较高的精度。Flow around a circular cylinder for low Reynolds number was numerically simulated through the laminar model with the reasonable meshing division.The producing and development of the vortex shedding from the circular cylinder were simulated by using the software FLUENT.Distribution of surrounding pressure coefficient around circular cylinder surface and drag coefficient and lift coefficient,as well as Strouhal number were calculated.In order to study the control measures of the flow around circular cylinder,the numerical calculations of different baffles were carried out.Analysis results show that the vortex shedding of flow around circular cylinder can be well controlled by placing the baffle at the downstream medial axis of the circular cylinder,which can reduce drag and resist vibration;the calculated results of different coefficients agree well with other numerical results from the references.The method has a high accuracy.

关 键 词：雷诺数 数值模拟 圆柱绕流 阻力系数 升力系数 

分 类 号：TU317.1[建筑科学—结构工程]