Tank Filling CFD Simulation, 3-phase, ANSYS Fluent Training

$80.00 Student Discount

In this project, Tank Filling with three phases (VOF) has been simulated and the results have been investigated.

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Tank Filling Project Description

The current project simulates the tank filling by Ansys Fluent software. The goal of many operations in the chemical industry is to separate the components of a solution or mixture from each other or to obtain a pure substance from a combination of two or more components. In this Tank Filling simulation,  using the VOF (volume of fluid) method, the interaction of three phases, including water, alcohol, and air was investigated. For this purpose, the effect of shear forces on the boundary between the phases was applied by applying surface stresses between the two phases. Water enters the domain through a 10 cm side valve at a speed of 1 m / s, and the interaction of the phases was investigated by comparing different contours.


Geometry & Mesh

The computational domain was designed using Design Modeler software, and its dimensions were a cube with a side of 1 meter. A square valve with a side of 10 cm in the wall was designed to allow water to flow into the domain. In the beginning and before starting to solve the problem, there was 40 cm of alcohol in the bottom of the container


Ansys Meshing software was used for grid generation, and the type of problem elements was structured. Also, the total number of elements was about 421,000.


Tank Filling CFD Simulation

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

  • Due to the incompressibility of the flow, the pressure-based solver method has been selected.
  • The simulation is transient.
  • The gravity effect is considered equal to -9.81 m.s-2 on Y-axis
  • All thermodynamic properties of fluids, including density, were assumed to be constant.

The VOF (Volume of Fluid) model is used to simulate non-mixing biphasic flows and is generally used to simulate the interface of two fluids. In other words, the VOF model will be highly efficient when the goal of the simulation is to study the interface between two fluids. In the software, the equations of each phase were solved discretely along with the  RANS and turbulence equations.

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

Material Properties
Amount Fluid properties
998.2 Density (kg/m3)
Amount Fluid properties
790 Density (kg/m3)
Amount Fluid properties
1.225 Density (kg/m3)
Homogeneous model VOF (volume of fluid)
Number of Eulerian phases 3 (water-alcohol-air)
Interface modeling sharp
Formulation Explicit
Phase interaction
Fluid type Surface tension coefficient (N/m)
Water-air 0.072
Alcohol-water 0.043
Air-alcohol 0.022
Boundary Condition
Type Amount (units)
Velocity inlet 1 m/s
pressure outlet (gauge pressure) 0 pa
Cell zone condition
Fluid mixture
Turbulence models
K-epsilon  viscous model
Realizable K- model
Standard wall functions Wall function
Solution methods
SIMPLE pressure velocity coupling
PRESTO pressure spatial discretization
Second-order upwind momentum
First-order upwind turbulent kinetic energy
First-order upwind      turbulent dissipation rate
Volume fraction      Geo-reconstruct

Tank Filling Results

In this section, first, the velocity counters at 1 and 15 seconds after solving were given below. As can be seen in the attached animation, as the volume of water in the tank increases, the alcohol phase moves upwards, and due to the non-mixing of water and alcohol, the separation operation can be performed by placing a drain valve under the tank.


  1. Avatar Of Tevin Haag

    Tevin Haag

    I was pleased with the detailed explanation of the tank filling simulation. Will I be able to apply this training to a four-phase system with different fluids?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your feedback! I’m glad to hear you found the three-phase tank filling simulation useful. While this specific training focuses on a system with water, alcohol, and air, the core principles of VOF modeling and the steps you’ve learned can indeed be applied to a simulation with four phases. You’d need to account for the additional phase interaction properties, update the boundary conditions accordingly, and ensure that the mesh is refined enough to capture the interfaces between all fluids involved.

  2. Avatar Of Ms. Vesta Hoppe

    Ms. Vesta Hoppe

    I was really impressed with the precision of the interactions between water, alcohol, and air in the Tank Filling CFD simulation. The clear definition of boundaries and smart application of the VOF methodology serve as a great learning resource for understanding multiphase flow.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind review! We’re thrilled to hear that the Tank Filling CFD simulation met your expectations. It’s always reassuring to know that our efforts to provide detailed and precise simulations contribute to a deeper understanding of complex processes like multiphase flows.

  3. Avatar Of Winnifred Rosenbaum

    Winnifred Rosenbaum

    This course made my understanding of the VOF model so much clearer! It simplified the concept of phase interactions in a multicomponent system.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you so much for your kind words! We’re thrilled to hear that our Tank Filling CFD Simulation course made the VOF model clear and easy to understand. Our aim is to simplify complex concepts, and your feedback reaffirms the work we’re doing. We appreciate your support!

  4. Avatar Of Rudy Heller I

    Rudy Heller I

    I was fascinated by the multiphase aspect of the simulation. Could you clarify how each fluid’s temperature impacts the simulation and whether it’s taken into account in the VOF method?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In the VOF model for this tank filling simulation, the primary focus is on the interaction between the fluid phases, which includes their densities and surface tensions as mentioned in the project description. The temperatures of the fluids are typically important if the simulation includes heat transfer or if temperature variations substantially affect the fluid properties like viscosity or surface tension. However, in this simulation, all thermodynamic properties, including density, are assumed constant, which implies that temperature effects are not a primary concern. Thus, the temperature of each fluid does not play a substantial role in this simulation model, as the separation is primarily due to differences in density and surface tension between water, alcohol, and air, rather than temperature-based stratification or mixing.

  5. Avatar Of Martina Ritchie Jr.

    Martina Ritchie Jr.

    Did the simulation investigate how different temperatures affect the interaction between water, alcohol, and air?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      According to the information provided in the project description, the effects of temperature on the interaction between the three phases were not investigated. The simulation focused on the separation process based on density differences under the assumption of constant thermodynamic properties, including density.

  6. Avatar Of Bobbie Dibbert Md

    Bobbie Dibbert MD

    I’m delighted with how the simulation applied real conditions to a multicomponent system. The visual output must be fascinating! Thanks for offering such a comprehensive learning tool.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re thrilled that our simulation’s ability to model real conditions and provide visual insight was valuable to you. Your appreciation truly motivates us to keep providing quality simulations for in-depth learning experiences.

  7. Avatar Of Alta Carroll

    Alta Carroll

    I am delighted with the precision of the three-phase separation simulation. The visualizations of the shear force impacts and phase interfaces were especially informative. It helped me grasp the fundamental separation processes in the chemical industry. Great job on illustrating complex phenomena in such a straightforward manner!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re thrilled to hear that our simulation has been helpful and provided clarity on such intricate concepts. It’s wonderful that the visual representations enhanced your understanding of separation processes. We appreciate your positive feedback and look forward to providing you with even more insightful products!

  8. Avatar Of Major Reinger

    Major Reinger

    I’m really impressed with the level of detail in the project description. It provides a thorough understanding of the simulation process. The inclusion of specifics such as the VOF method, mesh generation, boundary conditions, and even the results indicates a high-quality training product. Well done on creating an effective educational tool for understanding the complex dynamics of multi-phase flows in a tank filling scenario.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you so much for your positive feedback! We’re glad to know the product effectively delivered the intricacies of the simulation process and that you found the educational material comprehensive and helpful. Your appreciation really motivates us to continue creating high-quality CFD training materials. If you have any more questions or need further assistance in the future, don’t hesitate to reach out!

  9. Avatar Of Marian Jerde Ii

    Marian Jerde II

    I really appreciated the clear presentation of material properties for each fluid phase. It made understanding the multiphase interaction within the tank more tangible.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re pleased to hear that the detailed presentation of material properties enhanced your understanding of the multiphase interactions. If you need further clarification or information on any aspect of the simulation, feel free to reach out. Your insights are invaluable to us!

  10. Avatar Of Eldred Keeling

    Eldred Keeling

    Fantastic learning material! This comprehensive project thoroughly elucidated the liquid-liquid and liquid-gas phase interactions during tank filling. Observing the separation operation was particularly insightful.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to hear that the Tank Filling simulation project was insightful and that you appreciated learning about phase interactions with the VOF method in ANSYS Fluent. If you have any further questions or need more information on our training materials, feel free to ask!

  11. Avatar Of Mrs. Amelia Sauer I

    Mrs. Amelia Sauer I

    I just finished the Tank Filling CFD Simulation course, and the detailed insights on the interaction of three phases using the VOF method were thoroughly covered. Great course for understanding multiphase flow in industry applications!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to hear that you found the Tank Filling CFD Simulation course valuable and that it contributed to your understanding of multiphase flow. We appreciate you choosing our learning products and hope to assist you in your future learning endeavors as well.

  12. Avatar Of Lynn Pfannerstill

    Lynn Pfannerstill

    This product seems fascinating! The attention to detail appears robust, but I had one query: what was the deciding factor for choosing the Realizable K-epsilon model over other available models for turbulence in this scenario?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The Realizable K-epsilon model was chosen due to its ability to handle a wide range of turbulent flows with better accuracy in predicting the rates of strain and rotation. Its formulation also provides reliable simulations of the flow’s interaction with the tank boundaries, which is critical for the assessment of shear forces and phase separation in this tank filling scenario.

  13. Avatar Of Mckenna Price

    Mckenna Price

    The detailed simulation, can you explain which part of the tank filling results would help in optimizing the drain valve placement at the bottom to enhance separation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The simulation results related to the behavior of the alcohol phase as the tank fills would be crucial in optimizing the drain valve placement. Observing the alcohol’s upward movement when the water volume increases provides insight into the separation dynamics, which could inform decisions on the optimal position for the drain valve to maximize the efficiency of the separation process.

  14. Avatar Of Melvina Marvin

    Melvina Marvin

    I was particularly impressed by the clear separation achieved between water and alcohol in the tank filing simulation using the VOF method. The presentation of the simulation results, such as the velocity counters and the phase movement animations, demonstrated a comprehensive understanding of the process. Excellent work on visualizing the phase interactions and effects of surface tension.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback on the Tank Filling simulation! We are glad you appreciated the clarity of the separation process and the visual elements in the presentation of our results. It’s our goal to produce detailed and understandable CFD simulations. If you have any further questions or another topic you’re interested in, please let us know.

  15. Avatar Of Morgan O'Hara

    Morgan O’Hara

    I’m really impressed with the detail of this simulation for the Tank Filling CFD. Great job on displaying the interaction of the phases!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re glad to hear you are impressed with the simulation. We aim to provide detailed and accurate analyses in our CFD simulations. If you have any more questions or need further clarification on any part of our training materials, please don’t hesitate to ask.

  16. Avatar Of Albina Boyle

    Albina Boyle

    Everything sounds well-detailed, but does the simulation also show how the phase separation occurs over time, not just at 1 and 15 seconds?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, the simulation includes a full transient analysis. Phases (water, alcohol, air) can be tracked in motion as the tank fills up, which helps to understand and visualize the separation process throughout the simulation timeline, not just at the specific time instances mentioned.

  17. Avatar Of Sally Rohan

    Sally Rohan

    The simulation results are fascinating! Could you please explain how the separation operation is enhanced by gravity in this system compared to no gravity conditions?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Gravity plays a critical role in enhancing the separation of different phases in a tank filling simulation like this one due to differences in density. It creates a buoyant force that causes the lighter phase (alcohol) to rise and the heavier phase (water) to settle at the bottom. Without gravity, this natural separation due to buoyancy would not occur, and separating the phases would require alternative methods, such as centrifugation or additional mechanical systems. In this simulation, gravity ensures a passive and energy-efficient separation process, further illustrating the innovative capacity of CFD to model practical industrial operations.

  18. Avatar Of Mr. Tre Kessler

    Mr. Tre Kessler

    Loved this training on the Tank Filling CFD Simulation! The step-by-step explanation and use of VOF for three phases was outstanding. It helped me understand multiphase flow simulation much better.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      We’re thrilled to hear that the Tank Filling CFD Simulation training met your expectations and was helpful in furthering your understanding of multiphase flows! Thank you for your kind words, and we look forward to providing you with more quality learning materials.

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