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CFD simulation of gas tank filling with gasoline, using ANSYS Fluent software

Fluid flow in closed domains is very important in fluid mechanics. Filling or emptying of reservoirs is one of the most important applications of such flows. The significance of these flows becomes more and more evident when the fluid to be stored in the reservoirs is of particular importance. The storage of fuel in the industry has always been a concern.

In this project, it has been tried to simulate and analyze the automobile tank filling with gasoline by ANSYS Fluent software.

Geometry and grid

The geometry required for this project is from the car’s tank and is designed to be as real as possible. The solution domain and final geometry are prepared in ANSYS Design Modeler software. ANSYS Meshing software was used to produce the meshing required in this project. All elements presented in this grid are of the triangular type, and the meshing is unstructured. The total number of cells produced for this analysis is 9949151.

Model

The gas tank is initially full of air, and as soon as the gasoline enters it, we will see the gasoline and the air interaction. For this reason, the VOF multiphase model has been used to analyze this interaction. Due to differences in gasoline and air density, the relevant settings are applied in the software.

The K-epsilon Standard model is also used to solve the flow turbulence.

Boundary Condition

The flow input is specified as the mass flow inlet for the gasoline fluid and is set to 0.65625 kg/s. It should be noted that when the fuel tank is filled, in reality, the flow of air and gas simultaneously enters the tank and only some air is removed from the tank. For this purpose, the flow output for air is set to Pressure Outlet. The fuel tank body is also defined as a rigid body with the STATIONARY WALL condition.

Discretization of equations

The SIMPLE algorithms are used to solve the equations, and for the momentum equations, this discretization is considered as Second Order Upwind. This analysis is transient, and gravity effects are also considered.

The results are shown as pressure, velocity, and volume fraction contours.

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