College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China.
Key Laboratory of Port, Waterway & Sedimentation Engineering, Ministry of Communications, Nanjing 210029, China.
Int J Environ Res Public Health. 2023 Feb 27;20(5):4262. doi: 10.3390/ijerph20054262.
The flow characteristics around non-submerged spur dikes continuously placed in the channel on the same side with orthogonal angle to the wall were investigated by numerical simulations and experimental measurements. Three-dimensional (3D) numerical simulations with the standard - Model for incompressible viscous flow based on finite volume method and the rigid lid assumption for free surface treatment were conducted. A laboratory experiment was applied to verify the numerical simulation. The experimental data indicated that the developed mathematical model can effectively predict 3D flow around non-submerged double spur dikes (NDSDs). The flow structure and turbulent characteristics around them were analyzed and it was found that a distinct cumulative effect of turbulence exists between the dikes. By examining the interaction rules of NDSDs, the judgment criterion of spacing threshold was generalized as whether velocity distributions at the cross-sections of NDSDs along the main flow approximately coincided or not. It can be used to investigate the impact scale of the spur dike groups on the straight and prismatic channels and it is of great significance for artificial scientific river improvement and the assessment of river system health under human activities.
通过数值模拟和实验测量研究了与壁面正交角度连续放置在同一侧通道中的非淹没支墩的绕流特性。采用基于有限体积法的不可压缩粘性流标准模型和自由表面处理的刚性盖假设进行了三维（3D）数值模拟。应用实验室实验验证了数值模拟。实验数据表明，所开发的数学模型可以有效地预测非淹没双支墩（NDSD）周围的三维流动。分析了它们周围的流动结构和湍流特性，发现墩之间存在明显的湍流累积效应。通过检验 NDSD 的相互作用规则，将间距阈值的判断标准概括为 NDSD 沿主流的截面的速度分布是否大致一致。它可用于研究支墩组对直渠道和棱柱渠道的影响规模，对人工科学河流改善和人类活动下河流系统健康评估具有重要意义。
