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Water Droplet Falling on Resident Water, Ansys Fluent Training

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In this project, water droplet falling on resident water has been simulated and the results of this simulation have been investigated.

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

Water Droplet Falling Project Description

In this project, numerical simulation of water from falling on resident water has been done using Ansys Fluent software. The goal of this project is to simulate raindrop impact on resident water. The Eulerian VOF model has been used. The drop has an initial speed of zero, and gravity force pulls it down. gravity considered as -9.81 m/s-2 in y-axis.

Geometry & Mesh

The 3-D geometry of the present model is carried out using Design Modeler software. The geometry consists of three sections. The lower section is resident water. The upper section contains the outlet, and the upper section is air; the drop is considered a sphere of water with a physical diameter.

Water Drop Falling

The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured with no element quality lower than 0.53, and the total cell number is 3116593. the figure below shows an overview of the performed mesh.

Water Drop Falling

Water Droplet Falling CFD Simulation

To simulate the present model, several assumptions are considered, which are:

  • The solver is pressure-based.
  • Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
  • The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the y-axis in the present model.

The following is a summary of the steps for defining the problem and its solution

Models
K-omega Viscous model
SST k-omega model
shear flow corrections k-omega options
air primary phase
water secondary phase
explicit formulation
Boundary conditions
intersection Interface
0 initial gauge pressure Mixture
Air domain Coupled wall Water
1 volume fraction
Pressure outlet outlet
1 backflow volume fraction Air
0 backflow volume fraction Water
wall Wall
stationary wall wall motion
Solution Methods
Phase coupled pressure-velocity coupling
PRESTO! pressure
first-order upwind momentum
first-order upwind specific dissipation rate
first-order upwind volume fraction
Initialization
standard initialization method
0 water velocity (0,y,0)
0 m/s air velocity (x,y,z)
1 the secondary phase volume fraction

Water Droplet Falling Results

At the end of the solution process, two-dimensional and three-dimensional velocity, air and water volume fraction, and animation are obtained. This 3-D simulation has been performed to see the motion of water drop and gravity effect on two mixed fluid combinations. In this simulation, you see water drop has been pulled down with gravity force and impacts on the water surface.

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

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