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

$100.00 Student Discount

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.

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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.


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

  1. Avatar Of Mr. Kiley Hamill V

    Mr. Kiley Hamill V

    What type of droplet sizes are being used in the simulations, and how is the droplet placed in the computational domain?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In the given simulation, the exact size of the droplet is not detailed, however, typically droplets in such simulations are in the range of millimeters. The droplet is placed within the computational domain using the ‘patch’ function in the initialization step defining a volume of fluid (Phase2) initially as 1 in the Region_0, which represents the initial shape and location of the droplet on the wall.

  2. Avatar Of Miss Name Reichel

    Miss Name Reichel

    Fantastic learning resource for droplet dynamics! The detailed breakdown of theory, simulation setup, and results allowed me to grasp a complex topic thoroughly. The use of both non-slip and shear stress conditions offered a comprehensive understanding of different scenarios.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for the glowing review! We’re thrilled to hear our training material on droplet dynamics was helpful in enhancing your understanding. Your success is our top priority. If you have any further queries or need additional assistance with your learning journey, don’t hesitate to reach out!

  3. Avatar Of Anna B.

    Anna B.

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

  4. Avatar Of Myrna Mcdermott

    Myrna McDermott

    I’m really impressed with how comprehensive the Project Description is! This must have been a meticulous process.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for recognizing the detail and effort put into the simulation process. We are glad you appreciate the thoroughness of the Project Description. Your positive feedback motivates us to continue delivering detailed and practical training materials.

  5. Avatar Of Mrs. Kali Stehr Iii

    Mrs. Kali Stehr III

    I’m very impressed with the level of detail in this CFD analysis of droplet motion. Has the team considered the use of different wall materials to observe the effects on droplet dynamics?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your keen observation and compliment on the droplet motion simulation project. We are glad to hear that you appreciate the detailed analysis. Regarding your question, for the specific project you mentioned, we focused on the dynamics of a water droplet collapsing on a wall under non-slip conditions and shear stress without varying wall materials. However, the simulation can potentially be adapted to include different wall material properties to observe how they affect droplet behavior, such as wettability, contact angles, and surface tension effects. If you have any particular material in mind or a specific application you’re interested in, let us know, and we can explore customization options for future simulations.

  6. Avatar Of Tressa Braun

    Tressa Braun

    Could you please clarify if the effect of temperature variation was considered in the modelling of droplet collapse?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Temperature variation effects were not explicitly included in the project description for the water droplet collapse simulation. The simulation focused on using a Laminar viscous model for flow field equations and the VOF model for two-phase flow without mention of thermal effects.

  7. Avatar Of Dr. Emilia Auer

    Dr. Emilia Auer

    I appreciated the walkthrough of various simulation settings. Could I expect to simulate similar results on my system or are there any system-specific steps taken that weren’t mentioned in the description?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We aim to make the simulation as system-independent as possible. All model setup and configuration steps are mentioned in the description. In ANSYS Fluent, simulation results are usually consistent across different systems when the same settings and steps are followed. Do ensure your system meets the specifications required by the ANSYS software for optimal performance.

  8. Avatar Of Karley Leannon

    Karley Leannon

    I am thrilled with how clear the simulation results were. The visuals really helped me understand the droplet collapse dynamics in both non-slip and shear stress conditions.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback. We’re glad to hear that our visuals were effective in conveying the complex dynamics of droplet collapse on a surface. Your understanding of the simulation is exactly what we aim for with our instructional materials!

  9. Avatar Of Darian Schroeder

    Darian Schroeder

    The explanation of droplet collapse is very intriguing. Could you share more about how the wetting characteristics changed with and without the shear stress conditions?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The wetting characteristics in the droplet collapse simulation vary significantly between non-slip and shear stress conditions. Without the shear stress, the droplet spreads axially along the wall, resulting in a classic wetting phenomenon. However, with shear stress applied, the flow dynamics are altered, causing a distortion in the drop shape and an increased rate of spread. The shear force acts tangentially to the droplet’s surface, contributing to a different wetting pattern and an asymmetric spreading of the droplet.

  10. Avatar Of Ivah Wuckert Md

    Ivah Wuckert MD

    The training material seems very thorough! Did the simulation provide any insights on the potential applications of studying droplet collapse in industrial processes?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, indeed! The simulation offers valuable insights into the dynamics of liquid droplets impacting surfaces, which is vital for a range of industrial applications such as inkjet printing, coating processes, and cooling systems. Understanding droplet behavior can help improve efficiency and quality in these areas.

  11. Avatar Of Mrs. Brandyn Rutherford I

    Mrs. Brandyn Rutherford I

    I’m quite impressed with the level of detail in the simulation for the water droplet collapse. Can this model be used for completely different liquids or just for water? I am considering adapting the procedure to simulate a different fluid behavior.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! Yes, the model can be adapted to simulate different liquids by changing the material properties such as density and viscosity to match the characteristics of the new fluid. Make sure to also adjust the boundary conditions and possibly the solver settings if the fluid dynamics significantly differ from water.

  12. Avatar Of Magdalen Carroll

    Magdalen Carroll

    This CFD simulation’s attention to detail is impressive. The adaptive time step feature and explicit VOF model should provide a very accurate depiction of the droplet collapse and spreading. Great work on this training simulation!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      We are thrilled to hear that you are satisfied with the accuracy and detail provided in our Droplet Collapse simulation training module. Our team strive to offer high-quality educational simulations to enhance learning. Thank you for your positive feedback, it’s greatly appreciated!

  13. Avatar Of Timmy Grant

    Timmy Grant

    This CFD training module appears to be extremely informative. I was particularly impressed by the detailed meshing and assumptions used to realistically model the water droplet collapse. The use of VOF model shows MR CFD’s dedication to providing comprehensive simulation scenarios.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind feedback! We are thrilled to hear that you found our training material on the droplet collapse simulation informative and realistic. At MR CFD, we continuously strive to deliver detailed and thorough education on various CFD concepts. We’re glad you appreciated the efforts on meshing and the implementation of the VOF model.

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