李子龙,寇军,张景新.明渠条件下单丁坝绕流特征的数值模拟
Numerical simulations of flows around a single spur dike in an open channel[J].计算力学学报,2016,33(2):245~251 |
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明渠条件下单丁坝绕流特征的数值模拟
Numerical simulations of flows around a single spur dike in an open channel |
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| 投稿时间：2014-11-25 修订日期：2015-02-28 |
| DOI：10.7511/jslx201602016 |
| 中文关键词: 浅水 剪切流 马蹄涡 丁坝水流 有限体积法 |
| 英文关键词:shallow water horseshoe vortex spur dike flows free surface flow FVM |
| 基金项目:国家973计划(2014CB046200);水利部公益性行业科研专项经费(201401027);河口海岸交通行业重点实验室开放课题(KLECE201303)资助项目. |
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| 中文摘要: |
| 丁坝结构广泛应用于水利工程中,用以调整水流和护滩固堤,维护优良的水道通航条件。针对单丁坝局部水流,基于非结构网格,采用有限体积法(FVM),建立了三维自由表面水流模型,湍流模型采用S-A一方程模型。针对非淹没、正挑单丁坝,开展了系列Fr数条件下的水流模拟。重点分析丁坝局部流动结构,探讨丁坝坝根处局部涡系演化等特征,研究了丁坝下游回流区长度和宽度的变化,总结了丁坝引起的剪切流的沿程变化特征。 |
| 英文摘要: |
| Spur dike structures are widely used in hydraulic engineering,by constructing series of spur dikes perpendicular to the river banks the flow is kept away from the erodible banks,and as a result the laterally confined flow is accelerated to a sufficiently high velocity to keep the navigation channel at the proper depth.This paper is focused on with flows around a spur dike.We established a 3D model with free surface,which is based on unstructured meshes.The finite volume method (FVM) is employed to discretize the governing equations and one equation S-A turbulence model was used to simulate the turbulent flow.For study cases with different Fr number,we analyzed the flow structures near the non-submerged spur dike,discussed the formation of the vortex system at the base of the spur dike.Furtherly the length and width of the recirculation zone were calculated to reveal the evolution of the shear flow generated from the spur dike tip. |
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