Pouring Water out of a Bottle Simulation, Ansys Fluent Training

Project Description

In this project, Ansys Fluent software has been used for numerical simulation of pouring water out of the bottle. The Eulerian model has been used to simulate and solve the two-phase flow field equations. The Eulerian multiphase model in ANSYS FLUENT allows for the modeling of multiple separate yet interacting phases. The phases can be liquids, gases, or solids in nearly any combination.

Geometry & Mesh

The 2-D geometry of the present model is generated using SpaceClaim software.

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 150,642.

Pouring water 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 K-epsilon Standard viscous model with Standard wall function has been used to solve the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for Momentum, Turbulent kinetic energy, and Turbulent dissipation rate.

The boundary conditions and their details are shown in the figure below.

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

Models
Multiphase
	Model	Eulerian
	Eulerian parameters	Multi-Fluid VOF model
	Number of Eulerian phases	2(air & water)
	Interface modeling	Sharp
	Formulation	Explicit
	Primary phase	air
	Secondary phase	water
Viscous
	k-epsilon	Standard
	Near wall treatment	Standard wall functions
Material Properties
Air
	Density	1.225
	viscosity	1.7894e-05
water-liquid
	Density	998.2
	viscosity	0.001003
Boundary conditions
Outlet		Pressure outlet
Methods
Pressure-Velocity Coupling		SIMPLE
	Pressure	PRESTO
	Momentum	Second-order upwind
	Turbulent kinetic energy	Second-order upwind
	Turbulent dissipation rate	Second-order upwind
	Volume fraction	Compressive
Initialization
Initialization methods		Hybrid
Patch	Phase	water
	Variable	Volume Fraction
	Zones to patch	water
	Value	1
Run calculation
Time step size		0.0025
Max iterations/time step		20
Number of time steps		3708

Pouring Water Results

After the solution process is completed, contours of water velocity, Pressure, water volume fraction, and Eddy viscosity are extracted. As can be seen, under the influence of gravity, the water inside the bottle starts to flow, and it discharges to another empty container and fills it.

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