Page 99 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 3.1. Forced Convection in a Channel with Heated Walls

Phase Properties
The Phase Properties tab is where the phases of the flow are defined.

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

• Select Air in the Material Library drop-down list.

Phase 1
Fluid : Air

Simulation Parameters
The numerical parameters of the simulation are set in the simulation parameters tab.

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

• Set the following parameters to solve for an unsteady flow with an implicit method.

Simulation Type : Steady
Number of I t e r a t i o n s : 2000

Equations Section
In this tab the convergence threshold is defined, as well as the convection scheme and other
parameters of the solvers used by TransAT. Modify the convergence thresholds as follows:

• In the Equation tree highlight All Quantities and make sure that Normalised is checked. The
check box should be colored in orange

• set the Convergence Tolerance value as follows
Convergence Tolerance : 1.0 e−6

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 temperature.

• 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

• Proceed as above to set the initial state of the remaining quantities as follows

c
Ascomp AG Switzerland 89 Version 5.7