Author(s): Nguyen Duc Hanh; Tran Ngoc Anh; Shinichiro Onda; Luong Phuong Hau; Nguyen Kien Dung
Linked Author(s): Shinichiro Onda
Keywords: 3D flow simulation; Hydraulic modeling; Reverse circulation structures
Abstract: The application of the reverse circulation structures (or spur dike which has a space at the bottom) for concave river bank protection becomes popular in recent years in Vietnam. In order to understand the mechanism and effectiveness of such hydraulic structures, the investigation on turbulent flow field around the structures is essential. Furthermore, it is important to determine the significant turbulence properties for prediction of the local sediment transport regime and hence the river evolution. In this study, a three-dimensional numerical model was used for simulating the velocity field around a series of reverse circulation structures in the (180o) channel bend. The 3D hydraulic model based on RANS equations using a non-linear k-εturbulent closure was adopted in a generalized curvilinear coordinate system with moving coordinate technique for estimation of water surface variation. The simulation results of flow structure were then compared with a physical experiment and their good agreement confirms the capability of the numerical model in simulating the velocity field of such complex structures.
Year: 2014