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Periodic boundary condition needs to be defined in text command interface as opposed to other common boundary conditions. Click here for a detailed description of each step, and here for the report summary containing all modeling parameters.
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The results from 2D model was successfully duplicated in x-y plane of the 3D model with periodic boundary conditions. A comparison of the energy dissipation contour contours is shown below.
Energy dissipation contour of 2D model, k-epsilon realizable 1.5b
Energy dissipation contour of 3D model with periodic boundary condition, k-epsilon realizable
Since there is no variation in the z-direction in 3D model, the results from 2D is completely duplicated, which agrees with the underlying simplification of 2D simulation.
An important lesson
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In FLUENT, the material property, in this case water liquid should be defined in the boundary conditions as well as in the material list. The default material in FLUENT is always air, which need to be checked and modified correctly before every simulation.
Report summary is a very good way to keep track of all the parameter settings. And more effective and efficient way of data management is necessary for carry out simulation experiments efficiently.