Two-Phase Flow on the Surface of Two Cylinders, ANSYS Fluent Training

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In this project, two phase flow of water and air flowing over two cylinders is simulated.

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

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Project description

In this project, two phase flow of water and air flowing over two cylinders is simulated. The water will enter the computational domain with a velocity of 2.6m/s and it flows over the cylinders’ surfaces. The realizable k-epsilon model is exploited to solve fluid flow equations and VOF multi phase model is used to investigate the phase interactions.

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 smaller mesh is used in the proximity of cylinders’ walls. The total element number is 8048.

two phase flow

two-phase flow

Two-Phase Flow 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.

(Two-Phase Flow) Models  
Viscous model   k-epsilon
  Model Realizable
  Wall treatment Standard wall functions
Multiphase   VOF
  Body force formulation Implicit body force
  Surface tension coeff. 73.5 dyn/cm
  Phase 1 air
  Phase 2 water
(Two-Phase Flow) Boundary conditions  
Ambient   Pressure inlet
  Gauge pressure 0 Pa
  Water volume fraction 0
back   Pressure inlet
  Gauge pressure 0 Pa
(VOF) Water volume fraction 0
Inlet   Velocity inlet
  Velocity magnitude 2.6 m/s
  Water volume fraction 1
Outlets   Pressure outlet
  Gauge pressure 0 Pa
Walls   stationary
  Contact angle 90
(Two-Phase Flow) Solution Methods  
Pressure-velocity coupling   PISO
Spatial discretization pressure PRESTO!
Volume fraction compressive
momentum second order upwind
energy second order upwind
Turbulent kinetic energy first order upwind
Turbulent dissipation rate first order upwind
(Two-Phase Flow) Initialization  
Initialization method   Standard
  gauge pressure 0 Pa
  velocity (x,y) (0,0) m/s
  water volume fraction 0.01182033
  Turbulent kinetic energy 0.000191773 m2/s2
  Turbulent dissipation rate 0.02866952 m2/s3

Two-Phase Flow Results

The contours of pressure, velocity, streamlines, etc. are presented.

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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