3D simulation of flow around a single spur dike with free-surface flow
3D simulation of flow around a single spur dike with free-surface flow
复制标题
具有自由表面流的单丁坝周围流动的 3D 模拟
DOI：
10.1080/15715121003715107
复制
发表时间：
2010
影响因子：
2.5
通讯作者：
Aminuddin Ab. Ghani
中科院分区：
文献类型：
--
作者：
J. Yazdi;H. Sarkardeh;H. Azamathulla;Aminuddin Ab. Ghani
在本研究中，使用Fluent数值模型模拟了单个丁坝（也称为丁坝）周围的自由表面流的流态。该模型求解了全三维、雷诺平均Navier-Stokes方程，以预测三维流占主导地位的结构附近的流。为了处理复杂的自由表面流动，采用了带几何重构的流体体积法，湍流采用标准方程进行模拟。在这项研究工作中，结构化和非结构化网格都被使用，网格间距的密度被选择为在壁面和自由表面附近最高，以获得更准确的结果。三维模型的自由面和流速与其他研究者获得的三个实验水槽数据的比较显示出良好的一致性。利用数值计算结果计算了不同工况下丁坝的再附着长度，并给出了丁坝排斥、吸引和垂直组合时的流态。计算了河床切应力的分布规律，分析了流量、丁坝长度和丁坝倾角对河床切应力分布的影响。
In the present study, flow patterns around a single spur dike (also termed a groyne) with free-surface flow was simulated using a numerical model known as Fluent. The model solved the fully three-dimensional, Reynolds-averaged Navier–Stokes equation to predict flow near the structure where three-dimensional flow is dominant. To treat the complex free-surface flow, the volume of fluid method with geometric reconstruction scheme was applied and turbulence was simulated using standard equations. In this research work, both a structured and an unstructured mesh were used and the density of the mesh spacing was selected the highest near the walls and also free surface to obtain more accurate results. Comparison of free surface and velocities of 3D model showed good agreement with three experimental flume data obtained by other researchers. The reattachment length for various conditions was computed using the numerical results and flow pattern was presented for repelling, attracting and vertical spur dikes together. Also, bed-shear stress distribution was presented and the effects of flow discharge and the length and angle of the spur dike upon the bed shear-stress distribution were evaluated.