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Simulation of fluid flow on a jet ski

Simulation of flow around floating bodies on a fluid is one of the issues that we see them frequently in industries. Motion of Boats, ships, jet skis are examples of these phenomena. In this kind of problems two fluids are in contact with each other, also the phase changing and effect of each of the fluids on each other are important problems that should pay attention to it. In this project tried to analyze the effect of Jet Ski motion. For this purpose, the incompressible flow on the Jet Ski has been analyzed and simulate  by ANSYS fluent software.

Geometry and grid

The ANSYS meshing software is used for simulation of Jet Ski shape, and solution domain created according to problem requirement. The ANSYS meshing software has also been using for mesh generation. Due to the sensitivity of changes in important components of flow, including velocity and pressure, as well as hitting location of these phases to Jet Ski body, smaller and the higher quality grid has been used near the boundary of two fluids. In this meshing, all of the cells are triangular, and the number of cells is 1748941.

The used model and solution method

because of the multiphase flow in this project, the VOF multiphase model has been used, considering the flow is external flow, the open channel flow condition has been used. For investigation the turbulence of flow, the k-epsilon standard turbulence model has been used.

Boundary conditions

Two entries intended for inlet flow. The mass flow rate condition has been used for water, and its value is 50000 kg/s. Top of the domain which is in contact with surrounding air has also been considered as pressure outlet condition.

One symmetry surface in the middle of solution domain has been used (Because of symmetry in geometry and solution domain), in order to decrease solution time and cost of calculation.

The solution method and discretization algorithm

The simple algorithm has been used for the solution of equations. According to fluid that is used for solution, pressure-based condition has been used.For discretization of equations, the second order upwind method has been used. Finally, the results have been shown in the form of streamlines as well as pressure and velocity contours.

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