Page 406 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 10.1. Flow past a backward facing step

The Execute tab is automatically opened.
• Click Files then select Save As. Alternatively, press Ctrl+Shift+s.

• Click to select the folder where the project will be saved

• Create a new directory by clicking the icon

• Set a name for the new directory, say nosarp.

• Set a name to the project (backwardstep nosarp.stt for instance) then click .
This setup deactivates the correction feature, causing SarP to run in pure monitoring mode.
The detected iterations or time steps with convergence issues are listed in the SarP tab of the
simulation information panel of the Execute tab. To deactivate the correction feature of SarP:

• Select Input at the top of the TransATUI then select Simulation Parameters on the
left-hand side of the TransATUI

• Check SarP then set the mode to Stability (drop-down list)

• Click to open the Advanced Parameters window of the SarP module

• Uncheck Genetic Algorithm Correction/Optimisation, then click

10.1.8.2 Running the simulation

The simulation will now be run.
• Click Execute at the top of the TransATUI

The number of processors on which the simulation will be run can be changed by modifying the
value of the Number of Processors field. Set it accordingly to your workstation specification.
Note that it cannot be greater than the number of blocks which is equal to 4 in this case.

• Click to start the simulation
With these settings, the simulation should not converge within the specified number of iterations.
The simulation should stop after 2000 iterations.

To make non-converged simulations converge or make simulations converge faster, the numer-
ical parameters of the solvers in Simulation Parameters can be tuned. The setting of the
numerical parameters can be automatically done at runtime with the SarP module by means of
an optimising iterative process. The SarP module can detect the non-convergence of a simulation

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Ascomp AG Switzerland 396 Version 5.7