Open Channel Two-Phase Flow CFD Simulation, ANSYS Fluent Training

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In this analysis, the two-phase flow of water and air inside an open channel is investigated.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Open channel is waterway channel, or artificial waterways, for water conveyance, or to service water transport vehicles. They may also help with irrigation. It can be thought of as an artificial version of a river. Nowadays, the use of canals in the industry has received a lot of attention in applications including air ducts and water transmissions. The shape and dimensions of the channels also largely depend on their uses.

Open Channel Flow Project description

In this analysis, the two-phase flow of water and air inside an open channel is investigated. The standard k-omega model is used for solving turbulent flow equations. Also, multi phase VOF model with the use of an open channel setting is activated to simulate two phases of water and air inside the channel. The water enters the channel with a mass flow rate of approximately 60Kg/s and its interaction with the air phase inside the channel is simulated.

Open Channel Geometry and mesh

The geometry of this project is designed in ANSYS design modeler® and meshed inside ANSYS meshing®. The meshes type used for this geometry is structured and the total number of elements is 214560.

open channel

open channel

Open Channel 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 considered to be steady and do not change as a function time.
  • The effect of gravity has been taken into account and is equal to -9.81 in Y direction.

The applied settings are recapitulated in the following table.

Viscous model k-omega
k-omega model standard
k-omega option Shear flow correction
Multiphase VOF
VOF sub-model Open channel
Primary phase Air
Secondary phase water
Boundary conditions
Inlet Mass flow inlet
Water Mass flow rate 60.071524 Kg/s
Open channel
Free surface level 0.24 m
Bottom level 0 m
Density interpolation method From neighboring cell
Outlet Pressure outlet
wall motion stationary wall
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure PRESTO!
momentum second order upwind
Volume fraction compressive
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
(open channel) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
Turbulent kinetic energy 1 m2/s2
specific dissipation rate 1 m2/s3
Water volume fraction 0


Different contours of velocity, pressure and water volume fraction are presented in 3D and 2D.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.


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