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

• Published in: International journal of sediment research Vol. 24; no. 1; pp. 33 - 45
• Main Authors: ZHANG, Hao, NAKAGAWA, Hajime, KAWAIKE, Kenji, BABA, Yasuyuki
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2009; Disaster Prevention Research Institute,Kyoto University,Japan
• Subjects: 3D flow; Local scour; Non-linear k-ɛ model; Spur dyke; Unstructured mesh; 几何形状; 实验条件; 局部冲刷; 有限体积法; 湍流流动; 粒子图像测速; Unstructured mesh; Spur dyke; Local scour; Non-linear k-ɛ model; 3D flow; Non-linear κ-ε model
• ISSN: 1001-6279
• DOI: 10.1016/s1001-6279(09)60014-7

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.