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Circular Weir Simulation, Eulerian Three-Phase Flow, ANSYS Fluent Training

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In this project, the three-phase flow of water, air, and sand flowing over a circular weir is simulated.

This ANSYS Fluent project includes Mesh file and a Training Movie.

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Description

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 on the obstacle. These obstacles are regarded as weirs. Weirs have different uses depending on their shape and are mostly used in civil engineering. In this project, the three-phase flow of water, air, and sand flowing over a circular weir is simulated. The water will enter the computational domain with a velocity of 1m/s and it flows over the sand bed behind the weir. The water flow will lift some of the sand and carry it as it flows over the weir. The standard k-epsilon model is exploited to solve fluid flow equations and the Eulerian multiphase model is used to investigate the motion and interaction of the existing phases.

Circular Weir 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 unstructured and the total element number is 4770.

weirweirWeir 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 steady
  • 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.

 
Models
Viscous model k-epsilon
Model Standard
Wall treatment Standard wall functions
Multiphase Eulerian
Phase 1 air
Phase 2 water
Phase 3 sand
Boundary conditions
Inlets Velocity inlet
Sand inlet 0.6 m/s
Water inlet 1 m/s
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls stationary
Solution Methods
Pressure-velocity coupling Coupled
Spatial discretization pressure PRESTO!
Volume fraction first order upwind
momentum first order upwind
Turbulent kinetic energy first order upwind
Turbulent dissipation rate first order upwind
Initialization
Initialization method   Standard
gauge pressure 0 Pa
Air/sand/water velocity 0 m/s
Air/sand/water volume fraction 0
Turbulent kinetic energy 0.18375 m2/s2
Turbulent dissipation rate 16951.47 m2/s3
Sand granular temperature 0.0001 m2/s2

Discussion and Results

As can be observed in the sand volume fraction contour, the water flow will lift some of the sand from its bed and move it as the water flows over the weir, now in the long term the sand bed behind the weir will be washed completely and the blank space behind the circular obstacle will turn into a tangential path for water.

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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