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Hydrocyclone with a Tangent-Circle Inlet CFD Simulation (Validation)

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The simulation is based on a reference article “Effects of curvature radius on separation behaviors of the hydrocyclone with a tangent-circle inlet” and its results are compared and validated with the results in the article.

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

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Description

Paper description

The present problem simulates the two-phase flow of air and water inside a hydrocyclone. The simulation is based on a reference article “Effects of curvature radius on separation behaviors of the hydrocyclone with a tangent-circle inlet” and its results are compared and validated with the results in the article. In this project, two phase flow of water and air inside a hydrocyclone is simulated. The water will enter the computational domain tangentially with a velocity of 6m/s based on the paper. The Reynolds Stress Model is exploited to solve fluid flow equations and VOF multiphase model is used to investigate the phase interactions of the water and air core.

Hydrocyclone Geometry & Mesh

The geometry of this model consists of a water inlet and two pressure outlets and is designed in ANSYS design modeler®. It is meshed in ANSYS meshing®. The mesh type used for this geometry is unstructured. The total element number is 228517.

hydrocyclone hydrocyclone

Hydrocyclone 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 Z direction.

The applied settings are summarized in the following table.

 
Models
Viscous model Reynolds stress
Model Linear pressure-strain
Wall treatment Standard wall functions
Multiphase VOF
Body force formulation Implicit body force
Surface tension coeff. 0.0725 n/m
Phase 1 water
Phase 2 air
Boundary conditions
Inlets Velocity inlet
Velocity magnitude 6 m/s
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls stationary
Contact angle 90
Solution Methods
Pressure-velocity coupling SIMPLE
Spatial discretization pressure PRESTO!
Volume fraction Modified HRIC
momentum first order upwind
Reynolds stresses first order upwind
Turbulent kinetic energy first order upwind
Turbulent dissipation rate first order upwind
Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) (0,0,0) m/s
air volume fraction 1
Turbulent kinetic energy 0.005544744 m2/s2
Turbulent dissipation rate 0.0009691836 m2/s3

Paper Validation Results

At the end of this simulation, the results of the present work are compared with results obtained by the paper. For this purpose, the diagram in figure 10 was used which shows the changes of axial velocity of the mixture fluid based on the radial position of the hydrocyclone.

hydrocyclone

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

1 review for Hydrocyclone with a Tangent-Circle Inlet CFD Simulation (Validation)

  1. Andrzej Grawer

    Is discrete phase module used in this project??

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