Numerical Simulation of Flow Pattern around the Bridge Pier with Submerged Vanes
Numerical Simulation of Flow Pattern around the Bridge Pier with Submerged Vanes
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浸没叶片桥墩周流流态数值模拟
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Abbaspour
中科院分区：
文献类型：
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作者：
S. Azizi;D. Farsadizadeh;H. Arvanaghi;A. Abbaspour
桥对于建立通信路径非常重要。因此，控制桥墩周围的冲刷十分重要。提出了几种控制冲刷的方法。最有用的方法之一是使用水下叶片。另一方面，实验室环境迫使许多被认为有效的因素在冲刷现象中被跳过。在这种情况下，使用数值模型的重要性将更加突出。本文对水下叶片包围桥墩的流态进行了数值模拟。为此，使用Fluent软件对结构进行三维模拟。采用K-e湍流模型与VOF模型和混合模型进行多相流模拟。在此基础上，分析了两种流强、两种不同角度、多叶片等多种布置条件下床层的水面剖面、流速分布剖面和剪切张力。结果表明，数值计算结果与实验结果吻合较好。研究结果表明，采用VOF多相模型的Realizable k-e湍流模型可以较好地模拟水面剖面和速度分布剖面。提取的水面剖面和速度分布剖面的最大相对误差分别为2.23%和2.92%。此外，对数量和放置角度的分析表明，6片叶片比2片和4片叶片以及30度角比20度角的效果更好。本研究的其他结果是，在包括多个沉叶在内的不同布置条件下，水面剖面没有变化，桥墩周围的流速和剪应力量减小。
Bridges are very important for establishing communication paths. For this reason, it is important to control scour around bridge piers. Several methods have been proposed for scour control. One of the most useful methods is the use of submerged vanes. In the other hand, laboratory circumstances force many considered effective factors to be skipped in the scour phenomenon. In this situation, the importance of using numerical models would appear even more. In this research, numerical simulation of the flow pattern around the piers surrounded by submerged vanes has been carried out. For this purpose, the structure simulated in three dimensions using Fluent software. K-e turbulence model with VOF and mixture models for multiphase flow simulation were applied. Afterward analysis of the water surface profiles, velocity distribution profiles, and shear tension of the bed in multiple placements conditions including multiple vanes within two flow intensity and two different angles were performed. The results showed that there is a good agreement between numerical and experimental results. The best models in this research were found to be Realizable k-e turbulence model with VOF multiphase model for water surface profile and velocity distribution profiles. The maximum extracted relative errors for water surface profiles and velocity distribution profiles were 2.23% and 2.92%, respectively. Also, analysis of the counts and placement angles showed that 6 vanes rather to 2 and 4 vanes and also angle of 30 degrees rather to angle of 20 degree performs better in action. The other results of this study, are no change in water surface profiles, reduction of the velocity and the amount of shear stress around the piers in different placement conditions including multiple submerged vanes.