Item description

Simulation of two-phase 3D flow on a stair spillway

Spillways are one of the most useful fluid structures. The usages of these spillways in many industrial and non-industrial applications, including factory coolers, fluid separators, and etc. Non-industrial usages include water drains, decorative ponds, and so on. Because of the connection of two fluids (mostly water and air), the analysis of such problems due to the corrosion, and the interaction of two fluids is very important. The number and types of such issues in the industry, as well as in the nature, are very extensive and their analysis requires high precision.

In this analysis, it has been tried to simulate and analyze a two-phase three-dimensional flow on stair spillway using Ansys Fluent software.

Geometry and Mesh

The geometry used in this project consists of a number of stairs which are located serially. The geometry has been generated in Ansys Design Modeler software. Meshing is also generated in Ansys Meshing software. Meshing type used in this project is unstructured. The geometric shape of these cells are triangular and the number of cells produced was 753081.


This analysis has been done in a three-dimensional form. The phase shift results from the interaction of the two fluids (water, air ) has been analyzed. To analyze this phase change, the two-phase VoF model in Open Channel mode is used. The K-epsilon turbulent model in RNG mode is used to check the motion of the fluid. The Surface Tension Force model is used to analyze the impact of two fluids on each other. It should be noted that in such cases the impact of gravity must also be taken into account.

Boundary Condition

Due to the fact that two fluids are used simultaneously in this geometry, the input of the flow domain is divided into two parts, each part is used for a fluid. In this analysis, the input boundary is divided into two inputs for air and water using the Open Channel Model in the flow input. The input is set to Velocity-Inlet at 0.6 m/s. The output is defined as Pressure-Outlet.

Discretization of equations

SIMPLE algorithm is used to solve the equations in this analysis. The Second Order Upwind method is used to discretize equations for momentum and for pressure PRESTO method has been used.

The results have been shown as pressure, velocity, and phase contours.

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