Open Channel with a Side Outlet CFD Simulation, ANSYS Fluent Training

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In this analysis, the flow inside an open channel which has a 180-degree bend, with a side outlet is investigated.

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

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Open channel is waterways channels, 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.

Project description

In this analysis, the flow inside an open channel which has a 180-degree bend, with a side outlet is investigated. The standard k-epsilon model is used for solving turbulent flow equations. Also, multi phase VOF model is activated to simulate two phases of water and air inside the canal. The water enters the canal with a mass flow rate of 45Kg/s and in the middle of the bent section, the obstacles will reduce the flow pressure and guide a portion of entered water to side outlet for irrigation of a farm.

Geometry and mesh

The geometry of this project is designed and meshed inside GAMBIT®. The meshes type used for this geometry is structured and the total number of elements is 178093.

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 Z direction.

The applied settings are recapitulated in the following table.

Viscous model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Multi phase VOF
Primary phase Air
Secondary phase water
Boundary conditions
Free stream inlet Type Pressure inlet
Water inlet Type Mass flow inlet
Mass flow rate 45 Kg/s
Open channel
Free surface level 0.15 m
Bottom level -0.1 m
Density interpolation method From neighboring cell
Main & side Outlets Pressure outlet
wall motion stationary wall
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure PRESTO!
momentum second order upwind
Volume fraction Modified HRIC
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3
Water volume fraction 0

Open Channel Results

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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