非淹没丁坝附近三维水流运动特性的研究  

Study on flow characteristics around the non-submerged spur-dikes

作　　者：周宜林[1] 道上正规[2] 桧谷治[2] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098 [2]鸟取大学土木工程系日本国鸟取市

出　　处：《水利学报》2004年第8期46-53,共8页Journal of Hydraulic Engineering

摘　　要：非淹没丁坝是河道整治工程中一种常用的水工建筑物。为了分析非淹没丁坝布置效果,对丁坝附近三维水流运动试验研究和数值模拟。建立了三维水流大涡模拟数学模型,采用迭代法求解速度和压力,再由离散化的自由水面运动方程求解自由水面;根据试验观测的水面线和流速分布资料,对数学模型进行验证。在此基础上,数值比较了三种丁坝(上挑,正挑,下挑)附近水流运动特性,结果表明,非淹没丁坝对水流运动影响较大,但三种形式的丁坝对水流的影响差别不大,相对而言,下挑丁坝对坝头防护效果较好。A mathematical model based on large eddy simulation is developed to simulate the 3-D flow around the non-submerged spur-dikes. Iterative method is applied to solve the flow equation to derive the flow field and pressure distribution. The free surface of the flow can be obtained from the discrete solution of the free surface flow equation. The validity of the model is verified by model test. On this basis, the flow characteristics around the spur-dikes with different intersect angles are analyzed. It is found that the spur-dikes may significantly affect the flow field but the intersect angle is not the major factor. The spur dikes with obtuse intersect angle is in favor of preventing the erosion of the dikes.

关 键 词：丁坝 大涡模拟 交错网格 有限差分方法 自由水面 

分 类 号：TV863[水利工程—水利水电工程]