壁面粗糙度突增对明渠紊流边界层影响的数值模拟研究  

The numerical simulation research of effect on turbulent boundary layer to a sudden increase in wall roughness in open-channel flow

作　　者：李书芳[1] 胥战海[2] 杨纪伟[1] 

机构地区：[1]河北工程大学教务处,河北邯郸056038 [2]河北省唐山市水利规划设计研究院,河北唐山063000

出　　处：《中国农村水利水电》2009年第11期47-49,52,共4页China Rural Water and Hydropower

摘　　要：壁面粗糙度突变问题是明渠紊流研究中的一项重要内容。利用计算流体力学软件FLUENT对粗糙度突增的明渠紊流边界层进行数值模拟,分析了壁面从光滑到粗糙突变过程中对突变点下游流动特性产生的影响,包括断面主流速分布、紊流强度分布以及壁面切应力和摩阻流速的变化。模拟计算中采用交错网格的有限体积法离散控制方程,并应用标准的k-ε紊流模型来封闭方程组。将模拟结果与实验结果进行对比,两者吻合较好,从而验证了数值模拟方法的可行性与可靠性。The problem of sudden change in wall roughness is an important part of turbulent study in open-channel flow. Using computational fluid dynamics software FLUENT in the paper, turbulent boundary layer in open-channel with sudden increasing roughness is simulated. The effect on flow characteristics after the break point where the roughness increases suddenly from smooth to rough is analyzed, including cross-section primary velocity distribution, turbulent intensity distribution as well as the change of bed shear stress and friction velocity. The finite volume method on staggered grids is used to discrete the control equations, and the standard κ-ε turbulence model is used to close equations. The simulations results were compared with experimental results; it can be found good agreement between the two, which proved the feasibility and the reliability of numerical simulation.

关 键 词：壁面粗糙度 素流边界层 数值模拟 有限体积法 Κ-Ε紊流模型 

分 类 号：TV122[水利工程—水文学及水资源]