Spillway CFD Simulation, Two-Phase Flow
In this project, the two-phase flow of water and air flowing over an ogee spillway is simulated.
This ANSYS Fluent project includes Mesh file and a Training Movie.
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If any obstacle is placed on the path of the fluid flow, it causes the fluid level to rise behind it and increase its velocity, which eventually leads to fluid overflowing over the obstacle. These obstacles are regarded as spillways. spillways have different uses depending on their shape and are mostly used in civil engineering. In this project, the two-phase flow of water and air flowing over an ogee spillway is simulated. The water will enter the computational domain with a mass flow rate of 60 tons/s and it flows over the spillway. The standard k-epsilon model is exploited to solve fluid flow equations and the VOF multiphase model is used to investigate the motion and interaction of the existing phases.
Geometry and mesh
The geometry of this model is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The mesh type used for this geometry is structured and the total element number is 12846.
Spillway CFD simulation settings
The key assumptions considered in this project are:
- Simulation is done using pressure-based solver.
- The present simulation and its results are transient.
- The effect of gravity has been taken into account and is equal to -9.81 m/s2 in Y direction.
The applied settings are summarized in the following table.
|Wall treatment||Standard wall functions|
|Inlets||Mass flow inlet|
|Water inlet||60 tons/s|
|Gauge pressure||0 Pa|
|Volume fraction||first order upwind|
|momentum||second order upwind|
|Turbulent kinetic energy||first order upwind|
|Turbulent dissipation rate||first order upwind|
|gauge pressure||0 Pa|
|water volume fraction||0|
|Turbulent kinetic energy||1 m2/s2|
|Turbulent dissipation rate||1 m2/s3|
After the simulation process The contours of pressure, velocity, phases volume fraction, etc. are extracted and presented.
Mesh file is available in this product. By the way, the Training File presents how to solve the problem and extract all desired results.