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Droplet fall in oil and water, CFD simulation and analysis by ANSYS Fluent software

The fall of objects in fluids, as well as the deformation resulting from this fall, are among the topics of interest to mechanical engineering science. The deformation of droplets in fluids also has always been considered due to the numerous reasons in industry, medicine, nature, and so on.

The most important forces discussed in these studies is the Buoyancy from the fluid to the falling object.

In this analysis, an attempt has been made to simulate and analyze the fall of a droplet in oil in the ANSYS Fluent software.

Geometry and grid

The geometry required for this analysis consists of a cube-shaped chamber containing oil. This geometry is designed in ANSYS Design Modeler software and the required meshing is also produced by ANSYS Meshing software for this geometry. The meshing for this geometry is structured and the total number of cells created for this geometry is 1086822.


To analyze the flow turbulence in this simulation, the LAMINAR viscosity model has been used. Regarding that this analysis is a two-phase problem, the VOF multiphase model has been used and Surface Tension Force Modeling has been used for interaction of phases. Gravity is also considered in this analysis.

Boundary Condition

In this analysis, the wall of the entire solution domain, which includes all cube surfaces, is defined as Wall.

Discretization of equations

The SIMPLE algorithm is used to solve the equations in this analysis. Pressure-Based solver is also used for flow. The second order upwind method is used to discretize the momentum equations and the PRESTO method is used for pressure equations.

At the end, the results are shown as droplet deformation diagrams.

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