Commonly used control parameters

Solution control parameters can be used to control:

  • nonlinear equation solution accuracy and

  • time increment adjustment.

These solution control parameters need not be changed for most analyses. In difficult cases, however, the solution procedure may not converge with the default controls or may use an excessive number of increments and iterations. After it has been established that such problems are not due to modeling errors, it may be useful to change certain control parameters.

This section presents a brief synopsis of the more important solution control parameters, together with a description of the circumstances in which they can be used effectively.

Values given for the solution control parameters remain in effect for the remainder of the analysis or until they are reset. You can restore all solution control parameters to their default values (see About convergence and time integration criteria).

The following topics are discussed:

Related Topics
About convergence and time integration criteria
In Other Guides
*CONTROLS
Customizing general solution controls

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