Study on 3-D Flow Field Between Spur Dike
|關鍵字:||FLUENT;三維流場;丁壩流場;FLUENT;3-D flow field;flow field around spur-dike|
|摘要:||本研究使用三維計算流體力學軟體FLUENT模擬渠道內流經兩支丁壩之流況，藉由軟體模擬流場特性，了解三維流場分布及渦度分布情形。FLUENT數模係採用有限體積法(finite volume method)離散控制方程式，以二階上風法離散對流項，由SIMPLE法耦合速度與壓力，使整個流場符合質量及動量守恆，再由多項流K-ε紊流配合流體體積法處理三維自由液面水流。
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.
|Appears in Collections:||Thesis|
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