Jet Ski CFD Simulation (Two-Phase Flow Study), ANSYS Fluent Training


In this project, an attempt has been made to investigate the effect of the movement of a jet ski on the border of two fluids (water and air interface).

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

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Introduction & Project description

Flow around floating objects on a fluid is one of the most common phenomena around us. Moving boats, ships, jet ski and so on. In such cases where two fluids are in contact with each other, the phase change and the effect of each phase on one another is always an important issue that must be considered.

In this project, an attempt has been made to investigate the effect of the movement of a jet ski on the border of two fluids (water and air interface) by ANSYS Fluent software. The computational domain consists of an inlet wherein the water enters with a mass flow rate of 50000Kg/s and a pressure outlet. The multi phase VOF model is activated for solving multi phase flow equations and the standard k-epsilon model is exploited to account for the turbulence in fluid flows.

Jet Ski Geometry & mesh

The geometry of this project is designed in Ansys Design Modeler software. Ansys Meshing software has been used to create a computational grid and mesh for the geometry. Also, due to the sensitivity of changes in important components of the flow such as velocity and pressure near the boundary of the two fluids and also where the two phases collide with the body of the jet ski, we have tried to use finer and better grids and mesh. the mesh type used in this geometry is unstructured and the total number of elements is equal to 1748941.

jet ski jet ski jet ski

 Jet Ski CFD simulation settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has been taken into account and is equal to -9.81 in Z direction.

The applied settings are recapitulated in the following table.

jet ski Models
Viscous model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Multi phase VOF
Primary phase Air
Secondary phase water
jet ski Boundary conditions
up Type Pressure inlet
Water inlet Type Mass flow inlet
Mass flow rate 50000 Kg/s
Open channel
Free surface level 0 m
Bottom level -11 m
Density interpolation method From neighboring cell
Outlets Pressure outlet
wall motion stationary wall
jet ski Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure PRESTO!
momentum second order upwind
Volume fraction compressive
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
jet ski Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3
Water volume fraction 0

Jet Ski Results

The contours of pressure, velocity, velocity vectors and water volume fraction are presented.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

1 review for Jet Ski CFD Simulation (Two-Phase Flow Study), ANSYS Fluent Training

  1. Sam

    I think to investigate the movement of a jet ski on the water-air surface we should use transient simulation to capture comprehensive data on time varying flow features.

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