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Simulation and analysis of two-phase flow ( air, water ) on a spillway

Dams are considered very important structures because of their strategic importance and also the supply of water, and most importantly the production of high-efficiency of electric power. For this reason, analyzing the behavior of the flow behind the dam, as well as analyzing and simulating the two-phase flow of air on a spillway in the industry, are so interesting to designers and engineers.

An example of a dam with a scale of 1:50 has been designed and fluid behavior on spillway is simulated and analyzed.

In this analysis, an attempt has been made to simulate and analyze the two-phase flow (air, water) on a spillway through Ansys Fluent software.

Geometry and Mesh

Spillway geometry has been designed using Ansys Design Modeler software, required improvements are needed to reach the best example of a dam spillway.

Required meshing is also produced using the Ansys Meshing module for this geometry, which is entirely unstructured. Cell types on all surfaces is triangular. This meshing system consists of 698691 cells.

Some of the fluid changes to the gas phase when it is falling down from the dam. For analysis of the phase shift caused by the fall of the fluid from the top of the spillway, the VoF model is considered as an open channel flow. This analysis is done transiently.

Model

Given that the turbulence is very high in this flow and also in the two-phase flow, the separation of the flow from the edge of the spillway occurs throughout the analysis. The K-epsilon turbulence model has two equations in the standard state. Due to the high quality of the model, it has been used for flow separation analysis.

Discretization of equations

In order to solve the velocity and pressure equations in a two-phase flow, SIMPLE algorithm is used to solve the equations as pressure-based solver, which is used to solve the second-order upwind discretization of the momentum equations.

The boundary conditions of the flow in the input are defined as two-phase (air and water). The type of this boundary condition is determined according to the actual data as Mass Flow Inlet.

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