# Simulation of airflow around the train

The study of the motion of objects is one of the most interesting topics in the science of mechanics. In recent years, it has been attempted to simulate the motion of objects, as well as the effect of the surrounding fluid on the body and the direction of motion of the objects, using simulation software.

The advanced aerodynamic design of the train is an effective factor in reducing energy consumption. This time reduction is possible if the force exerted by the fluid is reduced. Therefore, aerodynamics plays an important role in the design of the train. Simulation of computational fluid dynamics has led to a reduction in the construction costs of trains and locomotives and can be used to examine the new design efficiency before construction.

In this analysis, it has been attempted to simulate the flow around the train in a steady state by Ansys Fluent software. The results are presented as the contour of pressure, velocity, velocity vectors, and flow lines.

### Geometry and gridding

The geometry required to include the body of the train and the range of flow resolution is generated by Gambit software. Networking is also produced by the same software. The grid type used in this analysis is unorganized and the total number of cells produced for this geometry is 1013277 cells.

### Model

Due to the nature of the flow shape, which is the type of external flow, as well as the flow velocity, which has consequences such as separation, behind the train and vortex, we have tried to consider the most appropriate turbulent flow model. Therefore, K-epsilon Standard is used to analyzing the current turbulence.

### Boundary conditions

The current input for the resolution domain is Velocity Inlet and is equal to 22.22 m / s for the input air to the resolution domain. The output from the range of the solution is also considered as a pressure outlet.

### Discretization of equations

According to the type of fluid flow in this analysis, Pressure-Based solver is used to solving the equations and the simple algorithm is used to decompose the coupling of speed and pressure. The momentum equations are discarded in the Second Order Upwind.

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