Droplet Collapse on a Wall with/without Shear Stress, Ansys Fluent Training

4.0 (1 review)


In this project, the water droplet collapse on the wall with/without shear stress 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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Project Description

In this project, Ansys Fluent software has been used for numerical simulation of water droplet collapse on the wall in two modes of non-slip condition and shear stress condition. The VOF model has been used to simulate and solve the two-phase flow field equations.

Geometry & Mesh

The 2-D geometry of the present model is generated using SpaceClaim software. The length of the computational area is 25 mm and its height is 12.5 mm.


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.


Droplet Motion 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 Laminar viscous model has been used to solve the flow field equations, and the pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for momentum and PRESTO! For the pressure discretization.

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

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


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

Droplet Motion Results

In this simulation, the free surface of the water droplet is investigated in two modes. The drop is primarily crushed, and the surface’s rate of dispersion and wetting has increased, which intuitively we expect the same behavior from the movement of the fluid in the presence of slip.

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

1 review for Droplet Collapse on a Wall with/without Shear Stress, Ansys Fluent Training

  1. Anna B.

    The “Minimum time step size” and the “Maximum time step size” are the same. So why did you use adaptive time advancement?

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