| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 95 === In this study, the commercial hydrodynamic software, FLUENT is adopted to construct a model for simulating the free surface flow through porous block. The modules used are the finite volume discretization, the second order upwind scheme, the near wall κ-ε model and the volume of fluid approach. Using GAMBIT preprocessor, a model that has a grid system composed of hexahedron and tetrahedron mixed meshes with total cells number of approximate 400 thousand is generated. The constructed model is verified using mean velocity and free surface profiles from experimental study, and prove that this complex model is capable of simulating the free surface variation, the 3-D turbulence flow field of the concerned problem.
The model is used to compute flows of entrance depths of 24.2cm、20cm、15cm at uniform entrance velocity of 0.397m/s. The computed free surface with noticeable elevation change and air mixture at the upper end of the block, the detail 3-D velocity distribution and pressure distribution in and outside the block, for the three cases, are presented. These results give good understanding to the detail flow structure in the pores of the block which are diffculty to observe using ordinary experimental methods.
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