Page 348 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 8.1. Flow around a train entering a tunnel

Physical Models

• Click Physical models on the left-hand side to define the equations to be solved for and
the models to be used in the simulation.

• Set the parameters of the window as follows

Basic Equations :
Pressure : ON
U Velocity : ON
V Velocity : ON
W Velocity : OFF
Temperature : OFF
Concentration : OFF

• Activate Turbulence Modelling and select RANS in the drop-down list.

• Activate Reference Properties and click to the right.

• Set the following parameters in the reference properties window then click to save the
settings

Reference Pressure : 0
Reference Velocity : 1.0
Reference Length : 0.02

Phase Properties
The Phase Properties tab is used to define the phases of the flow. Since the Multiphase Flow
Method is turned off, only the fluid properties of Phase 1 need to be defined. Here air properties
can be used:

• Click Phase Properties on the left-hand side of the TransATUI

• Select Phase 1 in the phase tree and select Air in the Material Library

Simulation Parameters
This tab is used to define the numerical properties of the simulation.

• Click Simulation Parameters on the left-hand side of the TransATUI

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