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Cohesion and Adhesion 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 product includes Geometry & Mesh file and a comprehensive Training Movie.

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Description

Cohesion and Adhesion Project description

In this project, two phase flow of water and air flowing over two cylinders considering cohesion and adhesion is simulated by ANSYS Fluent software. 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

Cohesion and Adhesion 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
Inlets
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

Cohesion and Adhesion Results

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

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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