Transitional motion of a cube containing Sloshing water-air, ANSYS Fluent

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In this project, the transitional movement of a cube containing sloshing water and air is investigated.

This product includes a Mesh file and a comprehensive Training Movie.

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Problem description

In this project, the transitional motion of a cube containing water and air is investigated. The interaction of water and air inside the cube is modeled using the Volume of Fluid (VoF) multiphase approach. Cube accelerates in the X direction with an acceleration equal to 5 m/s2, while gravitational acceleration in the –Y direction affects the multiphase entity. This project investigates the simplified sloshing effect in fluid containers where due to acceleration of carrier vehicle, a situation similar to one studied here can occur.

VoF multiphase approach is taken into account since it is an efficient and precise approach for capturing the interface location between phases while being one of the most common multiphase flow investigation approaches due to computational cost convenience. Results show that Pressure on the bottom surface of the cube varies with position; further away from the cube’s front, pressure increases.

Sloshing Cube Geometry and mesh

The fluid domain’s geometry is designed in Design Modeler, and the computational grid is generated using ANSYS Meshing. The mesh type is unstructured, and the element number is 168367.

transitional motion

Solver configuration

Critical assumptions:

  • The solver type is Pressure Base.
  • Time formulation is assumed unsteady.
  • Gravity effects are considered in –Y direction equal to 9.81 m/s2.
  • Acceleration in X direction is considered equal to 5 m/s2.

The following table represents a summary of the defining steps of the problem and its solution.

Models (Transitional Motion)
Viscous K-epsilon Standard
Near wall treatment Standard wall treatment
Multiphase (Volume of Fluid) No. of Eulerian phases 2
Formulation Implicit
Body force formulation Implicit body force
Materials (Transitional Motion)
Fluid Definition method FLUENT database
Material name air
Definition method FLUENT database
Material name Water
Solver configurations (Transitional Motion)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum Second-order Upwind
K First-order Upwind
Epsilon First-order Upwind

Transitional Motion Results and discussion

We investigate the sloshing effect in a simple cube containing water and air, which is accelerating in the X direction considering gravity. Pressure on the bottom of the cube increases as we move towards the back, and beginning from 1290 Pa, gauge pressure reaches the high value of 6500 Pa at the back face of the cube.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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