Jet Ski CFD Simulation (Two-Phase Flow Study)
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 ANSYS Fluent project includes CFD simulation files and a 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). 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 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.
|near wall treatment||standard wall function|
|jet ski||Boundary conditions|
|Water inlet||Type||Mass flow inlet|
|Mass flow rate||50000 Kg/s|
|Free surface level||0 m|
|Bottom level||-11 m|
|Density interpolation method||From neighboring cell|
|wall motion||stationary wall|
|jet ski||Solution Methods|
|momentum||second order upwind|
|turbulent kinetic energy||first order upwind|
|turbulent dissipation rate||first order upwind|
|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.
All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.