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Simulation of the two-phase Slushing in a moving cube

Slulshing is a phenomenon due to the periodic movement of the free surface of the liquid inside the reservoir, which causes to create maximum pressure points on the walls. This issue has raised the researchers’ interest in designing fluid transport vessels, which are usually half loaded, in order to maintain transport safety. Slushing on the ships carrying liquids gives significant force to the walls of the reservoirs and these forces are much larger on the flat plates and sharp corners. Slushing loads are often estimated by performing model testing or numerical simulations.

In this analysis, it has been tried to simulate and analyze the Simulation of the two-phase Slushing in a moving cube using Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The type of meshing used in this analysis is structural. The total number of cells produced for this geometry is 1728 cells.


In this analysis, the K-epsilon Standard Viscosity Model is used to check the fluid flow. The Standard Wall Functions is also used near the wall. The two-phase model of Volume of Fluid (VoF) is used to simulate two phase in this cubic reservoir. In this analysis, two different types of motion are considered for the reservoir.

1.       1) Move the tank at a constant velocity

2.       2) Fixed accelerator movement

Boundary Condition

The walls of the reservoir are defined as Wall.

Discretization of equations

In this analysis, the SIMPLE formulation algorithm is used to discretize the velocity and pressure coupling equations. The momentum and density equations are also discretized as Second Order Upwind.

The results are presented as velocity contours as well as streamlines.

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