In this project, fluid flow (water) on a stair spillway which is in contact with ambient air has been modeled. The fluid moves from the top of spillway with the velocity equal to 1m/s and in its entire pathway is in contact with the air.
The numbers and types of this kind of problems in industry and nature are very widespread, and their analysis requires high accuracy.
Geometry of this project has been made including series of steps that are consecutive. This geometry has been modeled in ANSYS Design Modeler software. Its meshing has also been produced by ANSYS Meshing software. An unstructured grid has been used for meshing. The geometric shape of this grid is triangular and the number of cells is 139067.
This project has been done in the form of 2 dimensional and also phase changing which is the result of interaction between air and water has been analyzed. This phase changing has been analyzed by VOF model.
The k-epsilon standard model has been used to analyze fluid flow motion. According to low velocity of fluid flow and low separation, this model is more capable in comparison with k-epsilon RNG model.
The simple algorithm has been used for the solution of this fluid flow and for discretization of equations the first order upwind method has been used.
Given that two fluids have been used simultaneously in this geometry, therefore the inlet of solution domain divided into two parts that each one of them is used for one of the fluids. The boundary condition of water inlet has been chosen as velocity inlet and the boundary condition of air inlet has been chosen as pressure inlet. In the outlet of solution domain, the pressure outlet condition has also been used.
It should be noted that in this type of problems the effect of gravity must be considered.
The results have been presented as pressure, velocity, and phases contours.
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