Bubbles Motion under the Water with/without Shear Stress CFD Simulation, Ansys Fluent Training

$100.00 Student Discount

In this project, bubble motion under the water on a plate with/without shear stress has been simulated and the results have been investigated.

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The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
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Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
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Description

Bubbles Motion Project Description

In this project, numerical simulation of bubbles motion under the water on a plate with and without shear stress 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 consider the effect of surface tension in simulations where the free surface in phase is investigated. The two modes in this project are simulated and compared. The difference between the two simulated modes is the presence and absence of surface tension. The initial size of the bubbles is assumed to be 2e-04 m.

Geometry & Mesh

The 2D geometry of the present model is generated using SpaceClaim software. The length of the computational area is 50 mm and its height is 65 mm.

Bubbles

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is structured in all of the computational domains, and the element number is equal to 81250.

Bubbles

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 explicit
Body force formulation Implicit body force
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

 

Initialization
Initialization methods Standard
Patch Phase Phase2
  Variable Volume Fraction
Registers to patch Region_0
Value 1
Run calculation
Time advancement Type adaptive
Parameters
Initial time step size 0.0002
Settings Minimum time step size 0.0002
Maximum time step size 0.0002
Time step size 1900

Bubbles Motion Results

Given the shape of the bubbles, it is clear how much error can occur in the simulation if surface tension is not taken into account. But if surface tension is not taken into account, the bubble will collapse due to water pressure.

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