Cohesion and Adhesion on the Surface of Two Cylinders, ANSYS Fluent Training

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.

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.