Page 350 - TransAT_Tutorial_Manual

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

• Select All Quantities in the equation tree and set the value of the Convergence Tolerance
as follows

Convergence Tolerance : 1.0 e−2

Initial Conditions
In this tab simple initial conditions can be set. In this case, initial values for all the relevant
quantities will be set to 0 except the velocity component in the x-direction.

• Select the Initial Conditions tab on the left-hand side of the TransAT user interface
• Click U-Velocity in the quantity tree

• Set Method to Constant and Value to 0.001

• Proceed as above to set the initial state of the remaining quantities as follows
V−Velocity
Method : Constant
Value : 0

Epsilon :
Method : Constant
Value : 0

Tke :
Method : Constant
Value : 0
Pressure
Method : Constant
Value : 0

Output Management
The parameters for the outputs of the simulation are defined in the Output Management tab.

• Click Output Management on the left-hand side of the TransATUI

• Set the Output File Format and Frequency of output files from Iteration / timestep
number as follows

Output F i l e Format : Paraview
Frequency of output f i l e s : 100

• Click to select the variables for which data is to be saved

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Ascomp AG Switzerland 340 Version 5.7