Setting Solver Parameters and Stopping Criteria

Training Guide > Multi-Phase Flow Tutorials > Gravity-Driven Flow Tutorial > Setting Solver Parameters and Stopping Criteria

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Setting Solver Parameters and Stopping Criteria

As we are solving an unsteady problem, it is necessary to specify the time-step size and the elapsed simulation time. This calculation will be run for 5.0 s with a time-step size of 0.005 s.

To specify the step size:

Select the Solvers > Implicit Unsteady node.

In the Properties window, change the Time-Step property to 0.005 s.

To set the run time:

Select the Stopping Criteria node > Maximum Physical Time node.

Set the Max Physical Time property to 5.0 s.

A default maximum number of time-steps is also currently defined. To remove this stopping criterion:

Select the Maximum Steps node.

In the Properties window, deselect the Enabled option.

The analysis will now run for 5.0 s, regardless of how many time-steps are performed.

The number of inner iterations per time step is set to 20 by default. This is more than is necessary for this simulation so the value may be reduced.

Select the Maximum Inner Iterations node.

In the Properties window, change the Max Inner Iterations property to 5.

Save the simulation.

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