Setting Solver Parameters and Stopping Criteria

Training Guide > Multi-Phase Flow Tutorials > Capillary Effects 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 2.0 s with a time-step size of 0.001 s, so will require 2,000 time steps.

To specify the step size:

Select the Solvers > Implicit Unsteady node.

In the Properties window, change the Time-Step property to 0.001 s.

To set the run time:

Select the Stopping Criteria > Maximum Steps node.

Set the Maximum Steps property to 2000

A maximum physical time is also defined. To remove this stopping criterion:

Select the Maximum Physical Time node.

In the Properties window, deselect the Enabled option.

The analysis will now run for 2,000 time steps, regardless of how long a physical time this represents.

By default, the number of inner iterations per time step is set to 20, considerably more than is necessary for this simulation. To reduce this value:

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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