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Effect of Contact Angle on Droplet Collapse, Ansys Fluent Training

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In this project, the effect of the contact angle on droplet collapse has been simulated and the results have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Effect of Contact Angle Project Description

In this project, numerical simulation of droplet collapse with two different contact angles has been done using Ansys Fluent software. The VOF model has been used to simulate and solve the two-phase flow field equations. The purpose of this project is to investigate the collapse of water droplets on the wall at the contact angle of 90 degrees and 120 degrees.

Geometry&Mesh

The 2D geometry of the present model is generated using SpaceClaim software. The length of the computational area is 5 mm and its height is 3.5 mm.

Effect

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured in all of the computational domains, and the element number is equal to 53440.

Effect

Effect of Contact Angle CFD Simulation Settings

We consider several assumptions to simulate the present model:

  1. Due to the incompressibility of the flow, the pressure-based solver method has been selected.
  2. The simulation is transient.
  3. The gravity effect is considered equal to -9.81 m.s-2 on Y-axis

The following tables represent a summary of the defining steps of the problem in this project and its solution:

Models
Multiphase
Homogeneous model Volume of fluid
Number of Eulerian phases 2(air& water)
Interface modeling Sharp

Interfacial

Formulation expilicit
Body force formulation Implicit body force
Contact angle 90&120
Viscous Laminar
Material Properties
 Air
Density 1.225
viscosity 1.7894e-05
water-liquid
Density 998.2
viscosity 0.001003
Methods
Pressure-Velocity Coupling SIMPLE
  Pressure PRESTO!
  Momentum Second-order upwind
Volume fraction Compressive
Run calculation
Time advancement Type adaptive
Parameters
Initial time step size 0.0003
Settings Minimum time step size 0.0003
Maximum time step size 0.0003
Time step size 180
Initialization
Initialization methods Standard
Patch Phase Phase2
  Variable Volume Fraction
Registers to patch Region_0
Value 1

Effect of Contact Angle Results

In this simulation, the behavior of water droplets in the two modes of contact angle of 90 and 120 degrees is investigated. According to the animation, it is clear that when the contact angle is 120 degrees, the water drop has more resistance to the momentary turbulence created and But we see more scatter in the 90-degree angle mode. This phenomenon can be important when more drops are on the wall next to each other.

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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