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| Numerical analysis of flow characteristics around piles under solitary waves |
| JIANG Chang-bo1,2, DENG Ya1, YAO Yu1,2, DENG Bin1,2 |
| 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410004, China; 2. Hunan Province Key Laboratory of Water, Sediment Sciences and Flood Hazard Prevention, Changsha 410004, China |
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Abstract To study the flow characteristics around single-row cylinders subjected to solitary waves, a 3D numerical wave tank was developed based on the open-source software package ‘OpenFOAM’ and the improved velocity-inlet wave generation method. The numerical model was validated by laboratory experiments in the literature, and then used to analyze the free surface elevations, streamlines as well as the vortices in the vicinity of cylinders. Numerical results show that the 3D distribution of wave runup around the cylinders is evident when the runup reaches its peak value in front of the cylinder. The flow pattern between two adjacent cylinders is typical under shallow-water long waves, and a vertex pair forms on the leeside of each cylinder. Compared with the interaction of solitary wave with a single cylinder, the magnitude of the vertex on the leeside of the single-row cylinders is larger, and the vortex structure is more stretched in the streamwise direction but less extended in the lateral direction.
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Published: 01 August 2015
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孤立波作用下排柱附近流动特性数值分析
为了研究孤立波作用下单排圆柱附近的流动特性,基于OpenFOAM开源程序包和修正速度入口造波方法建立三维数值波浪水槽.数值模型与物理模型实验进行对比验证,运用计算结果分析排柱附近自由液面、流线和涡量场的变化规律.结果表明：柱前孤立波壅高达到最大时,自由液面在圆周上三维分布特征明显；柱间水流流动具有典型的浅水长波特征,并在圆柱下游形成的对称漩涡；与单柱相比排柱后方涡动强度增大,涡结构发展呈现纵向拉长、横向缩窄的特征.
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