Spillway CFD Simulation, Two-Phase Flow, ANSYS Fluent Training

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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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Project description

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.

spillwayspillwaySpillway 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.

(Spillway) Models
Viscous model k-epsilon
Model Standard
Wall treatment Standard wall functions
Multiphase VOF
Phase 1 air
Phase 2 water
(Spillway) Boundary conditions
Inlets Mass flow inlet
Water inlet 60 tons/s
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls stationary
(Spillway) Solution Methods
Pressure-velocity coupling SIMPLE
Spatial discretization pressure PRESTO!
Volume fraction first order upwind
momentum second order upwind
Turbulent kinetic energy first order upwind
Turbulent dissipation rate first order upwind
Initialization method   Standard
gauge pressure 0 Pa
velocity 0 m/s
water volume fraction 0
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3

Spillway Results

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.


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