Numerical Modeling of Local Scour Around Hydraulic Structure in Sandy Beds by Dynamic Mesh Method

• Published in: Journal of Ocean University of China Vol. 16; no. 5; pp. 738 - 746
• Main Authors: Fan, Fei, Liang, Bingchen, Bai, Yuchuan, Zhu, Zhixia, Zhu, Yanjun
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.10.2017; Springer Nature B.V; Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, P.R.China%Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, P.R.China%State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300000, P.R.China%Jiangsu Province Water Transport Engineering Technology Research Center, Nanjing 21000, P.R.China; State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300000, P.R.China
• Subjects: Angle of repose; Bathymetry; Bed load; Computational fluid dynamics; Computer applications; Computer simulation; Dynamics; Earth and Environmental Science; Earth Sciences; Finite element method; Fluid dynamics; Hydraulic engineering; Hydraulic structures; Hydraulics; Hydrodynamics; Loads (forces); Mathematical models; Meteorology; Modelling; Oceanography; Safety engineering; Sand & gravel; Scour; Scouring; Sediment load; Sediment transport; Soil erosion; Suspended load; Three dimensional flow; Three dimensional models; Two dimensional flow; Two dimensional models; 冲刷模型; 局部冲刷; 开放源代码; 数值模拟; 水工建筑物; 流体力学模型; 砂质河床; 网格法; dynamic mesh; sand slide; local scour; sandy bed
• ISSN: 1672-5182; 1993-5021; 1672-5174
• DOI: 10.1007/s11802-017-3221-z

Local scour, a non-negligible factor in hydraulic engineering, endangers the safety of hydraulic structures. In this work, a numerical model for simulating local scour was constructed, based on the open source code computational fluid dynamics model Open FOAM. We consider both the bedload and suspended load sediment transport in the scour model and adopt the dynamic mesh method to simulate the evolution of the bed elevation. We use the finite area method to project data between the three-dimensional flow model and the two-dimensional（2D） scour model. We also improved the 2D sand slide method and added it to the scour model to correct the bed bathymetry when the bed slope angle exceeds the angle of repose. Moreover, to validate our scour model, we conducted and compared the results of three experiments with those of the developed model. The validation results show that our developed model can reliably simulate local scour.