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





































                                                Figure 8.2: Physical models


                   Simulation Type and Control Parameters


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

                     Simulation Type : Unsteady
                     Control Parameters
                       Max Number of Time Steps : 2000

                       Autorelaxation : ON
                         Relaxation Factor : 0.6


               A low relaxation factor gives a more stable simulation, while the simulation converges faster with
               a high value.

                   Equations
                  In the Equations section the convergence threshold is defined as well as the convection scheme
               and the solvers used by TransAT for each equation.






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Ascomp AG Switzerland                    339                                  Version 5.7
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