Page 306 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 7.2. coupling slug

Simulation Parameters
The Simulation Parameters tab is used to define the numerical parameters of the simulation.

• Set the following parameters to solve for an unsteady flow

Simulation Type : Unsteady
Time Scheme : Euler 1 st Order

Total Simulation time : 2 s
Max Number of Time Steps : 10000
I n i t i a l Time Step : 1e−3
Max number of i t e r a t i o n s per timestep : 20

Autorelaxation : ON
Relaxation Factor : 0.74

• 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 Limits : Min : 2.0 Max: 4.0
D i ff u s i o n : Min : 1.0 Max: 2.0
Fourier Number : Min : 1.0 Max: 2.0

Equations Section
In the Equations section, the convergence threshold is defined, as well as the convection scheme
and other parameters of the solvers used to run the simulation with TransAT.

• Select Pressure in the Equations tree

• Set the solver parameters given below to the following values

Convergence Tolerance : 1e−3
Solver : AMG R−cycle , adaptive
Max Solver I t e r a t i o n s : 100

• Select Other Variables in the Equations tree

• Set the Convergence Tolerance to the following value

Convergence Tolerance : 1e−2

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