Solar Desalination Considering Surface Evaporation CFD Simulation, ANSYS Fluent Training

$330.00 Student Discount

  • This problem simulates the HVAC of an operating room by ANSYS Fluent software.
  • The geometry of the present model is drawn by Design Modeler software and then meshed by ANSYS Meshing software.
  • It’s a Structured mesh, and the cell number equals 938174.
  • The VOF multiphase model is used for three phases air, water vapor, and water fluid.
  • Mass Transfer is applied to simulate Evaporation/Condensation.
  • Also, a UDF file is used to determine the phase change method.
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The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
The case and data files in ANSYS Fluent store the simulation setup and results, respectively, for analysis and post-processing.
Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.



This simulation is about surface evaporation in solar desalination via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

A simple solar still is designed in this simulation, consisting of inclined glass plates. Solar rays pass through the glass and reach the water’s surface inside the system. Heating the water surface causes surface evaporation.

The produced steam is pure and impure materials settled at the bottom of the system. This pure steam hits the inner surface of the inclined glass and causes condensation by losing heat. The slope used for the glasses causes the drops of distilled water to slide on the surface of the glass and be directed to the system’s outlet.

The geometry of the present project is modeled in three dimensions with Design Modeler software. Then the model meshed with ANSYS Meshing software. The model’s grid is structured, and 938,174 cells have been created.

Methodology: Surface Evaporation considering Solar Desalination

In this simulation, three different phases are used. In the initial state, the system is filled with air, and water is up to a certain level. After the solution process starts, the water gradually evaporates from the surface and creates vapor. So, to define the three phases simultaneously, it is necessary to use the Multiphase Model.

The VOF (volume of fluid) model has been used to define the multiphase model. This multiphase model can completely separate different phases from each other and display a distinct boundary between phases. Also, since the separation boundary between the two phases does not have a layer transition, the Sharp option has been used to interface between the phases.

Water liquid is defined as the primary phase of the model, and air and water vapor are defined as the secondary phases of the model. When the multiphase model is used, a parameter called volume fraction is provided for the secondary phases of the model to solve their transport equations.

Since a phase change occurs between the water and vapor phases, a Mass Transfer between these two phases is defined. This mass transfer is defined based on the Evaporation-Condensation mechanism. This mechanism deals with the phase change process between liquid and vapor.

A UDF function defines the rate of evaporation (water to steam). The equation used in this function is equivalent to the surface evaporation rate. The characteristic of surface evaporation is that it only happens on the surface of water’s level, and it is possible at a temperature lower than the saturation temperature. At the same time, boiling is a volumetric phenomenon and only happens at the saturation temperature.


After solving, the contours of temperature, pressure, and volume fraction of each water, air, and vapor phase have been obtained. The results correctly show that the water starts to evaporate from the surface with time. For this reason, the water level decreases over time.

In addition, the results show that the phase change does not necessarily occur at the saturation temperature. So, it can be said that the phase change mechanism based on the definition UDF function has worked correctly.


  1. Trevion Goyette


  2. Kurt Jenkins

    With this training, I was able to learn Mass Transfer, Multi-Phase Flow, Renewable Energy, UDF and VOF at the same time.
    Thanks to MR-CFD

  3. Glenda Reichert

    So proud of you Mr-CFD 🔥👏

  4. Modesto Armstrong

    What is the benefit of using CFD for analyzing the evaporation process in solar desalination systems?

    • MR CFD Support

      CFD allows for detailed analysis of the heat and mass transfer processes in solar desalination systems, providing insights that cannot be easily obtained through experimental tests.

  5. Ferne Kutch

    Can this simulation be customized to model the evaporation process in different types of desalination systems and under different conditions?

    • MR CFD Support

      Yes, we can accommodate your desired simulations. Please share more details about your specific requirements.

  6. Maia Heidenreich IV

    This is so informative

  7. Meda Harber DDS

    The use of CFD in this simulation is truly innovative!

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