L头丁坝绕流水力特性的三维大涡模拟  

Three-dimensional characteristics of flow around L-head groins by large eddy simulation

作　　者：魏文礼[1] 邵世鹏[1] 刘玉玲[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《武汉大学学报（工学版）》2015年第2期145-151,共7页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:51178391);陕西省科学研究计划项目(编号:2014K15-03-05);陕西省西北旱区生态水利工程重点实验室开放基金(编号:106-221223);中央财政支持地方高校发展专项资金特色重点学科资助项目(编号:106-00X101)

摘　　要：为了解决实际河道中丁坝附近的冲刷和淤积问题,必须探明其水力特性的分布规律.采用气液两相流混合模型结合大涡模型(Large Eddy Simulation)对不同平行导流墙长度下L头丁坝绕流三维水力特性进行数值模拟研究.采用有限体积法离散计算区域,速度与压力耦合方程组求解时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,模拟自由水面采用了VOF(Volume of Fluid)法.对不同平行导流墙长度下丁坝附近回流区域和涡量分布"云图"进行分析比较,得出当平行导流墙长度与丁坝坝轴线长度相等时对丁坝后漩涡的限制效果最好;平行导流墙长度对水槽中水流流速的影响很小,可以忽略.在河道中合理布设L头丁坝可以减小漩涡回流区范围,但对主流区流速的影响很小.In order to solve the river erosion, sediment deposition, and other problems near groins in actual rivers, the distribution of 3D hydraulic characteristics must be priorly studied. The gas-liquid two-phase mixture model with the large eddy model （LES）was used to numerically compute the hydraulic characteris- tics of flow around the L-head groins with different lengths of parallel guiding walls. The finite volume method was used to discrete the calculated region; the SIMPLE （semi-implicit method for pressure-linked equations） algorithm was used to solve velocity and pressure coupling equations; and free surface was sim- ulated by the VOF （volume of fluid） method, comparisons of the flow recirculation region and distribution of vorticity nephogram around the L-head groin with different lengths of parallel guiding walls show that the flow recirculation region behind the L-head groins is the smallest one when the length of parallel guid- ing wall equals to the axial length of the groin,and has no effect on the flow velocity value in the flume. L- head groins constructed in rivers play an important role of restricting the length of recirculation, but have no effect on velocity of main flow.

关 键 词：丁坝绕流 平行导流墙 回流长度 数值模拟 水力特性 

分 类 号：TV131.4[水利工程—水力学及河流动力学]