Page 225 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 5.2. particleseparator

Simulation Parameters
In the Simulation Parameters tab the numerical parameters of the simulation are defined,
such as the type of simulation to be run, the methods for computing the time step and solving
the equations.

Simulation Type and Control Parameters

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

• Set the following parameters to solve for an unsteady flow

Simulation Type : Unsteady
Time Scheme : Euler 1 st Order

Total Simulation time : 300.0
Max number of Time Steps : 2000
I n i t i a l Time Step : 1.0 e−4
Max number of I t e r a t i o n s per timestep : 20

Autorelaxation : ON
Relaxation Factor : 0.80

• For Time Stepping select Adaptive then click

• Set the following parameters in the Adaptive Time-Stepping window then click to save
the settings and close the window

CFL Min : 0.6 Max: 1.2
Di f f us io n Min : 0.6 Max: 1.2

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

• Select All Quantities in the equation tree. All the equations should be highlighted

• Modify the parameters besides the equation tree as the following Convergence Tolerance:
1e-2

c
Ascomp AG Switzerland 215 Version 5.7