Experiment and simulation of turbulent flow in local scour around a spur dyke  

作　　者：Hao ZHANG Hajime NAKAGAWA Kenji KAWAIKE Yasuyuld BABA 

机构地区：[1]Dr. of Eng., Assis. Prof., Disaster Prevention Research Institute, Kyoto University, Japan [2]Dr. of Eng., Prof., Disaster Prevention Research Institute, Kyoto University, Japan

出　　处：《International Journal of Sediment Research》2009年第1期33-45,共13页国际泥沙研究（英文版）

基　　金：supported in part by Toujiro ISHIHARA Research Fellowship from the Association for Disaster Prevention Research, Japan. Thanks also go to the anonymous reviewers who provided valuable advices for the improvement of the manuscript.

摘　　要：The turbulent flow in the local scour hole around a single non-submerged spur dyke is investigated with both experimental and numerical methods. The experiments are conducted under clear-water scour regime with an impermeable spur dyke. The scour geometry and flow velocities are measured in details with a high-resolution laser displacement meter, electro-magnetic velocimetries and PIV （Particle image velocimetry）. A 3D non-linear k-ε model is developed to simulate the complex local flow field around the scour area. The numerical model is formulated using FVM （Finite volume method） on a collocated unstructured mesh, capable of resolving complex geometries and boundaries. It is found that the simulation results are reasonably consistent with those of the experimental measurements. Based on the study results, the nature of the flow structure around a spur dyke with local scour hole is analyzed.The turbulent flow in the local scour hole around a single non-submerged spur dyke is investigated with both experimental and numerical methods. The experiments are conducted under clear-water scour regime with an impermeable spur dyke. The scour geometry and flow velocities are measured in details with a high-resolution laser displacement meter, electro-magnetic velocimetries and PIV （Particle image velocimetry）. A 3D non-linear k-ε model is developed to simulate the complex local flow field around the scour area. The numerical model is formulated using FVM （Finite volume method） on a collocated unstructured mesh, capable of resolving complex geometries and boundaries. It is found that the simulation results are reasonably consistent with those of the experimental measurements. Based on the study results, the nature of the flow structure around a spur dyke with local scour hole is analyzed.

关 键 词：Spur dyke Local scour 3D flow Non-linear k-ε model Unstructured mesh 

分 类 号：TV863[水利工程—水利水电工程] O357.5[理学—流体力学]