Study on 3-D Flow Field Between Spur Dike

• Main Authors: Wu,Jian-Bin, 吳健賓
• Other Authors: Yeh, Keh-Chia
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/26362889063293795824

碩士 === 國立交通大學 === 土木工程系所 === 102 === In this study, three-dimensional computational fluid hydrodynamics software, FLUENT, is adopted to simulate the flow passing through two groynes in a channel. By simulation, we find the flow characteristics and the distribution of three-dimensional flow pattern and vorticity in the spur-dike region. The model applies the finite volume discrete control equation, the second-order upwind scheme discretization advection term and the SIMPLE method coupled velocity and pressure to satisfy the mass conservation and momentum conservation. Also, the model uses the K-ε turbulent model and volume of fluid method to simulate the three-dimensional flow and its free surface, respectively. Using mesh preprocessor, the model has a grid system composed of hexahedron and tetrahedron mixed meshes with total number of cells approximate 200 thousand are generated in this study. The model simulates three cases with different conditions of groyne length, groyne spacing and inflow velocity. By regression, we obtain the relational formula between three variables and both vortex length and distribution of velocity around groyne. Using FLUENT model, we can obtain the local phenomenon that is difficult to measure.