Engineering analysis + design software

User Area > Advice

Typical warning message from LUSAS Solver text output file (*.OUT):

***WARNING*** CURRENT INCREMENT HAS FAILED TO CONVERGE (NONLCT PROCESSOR)


This message is generally no cause for concern.  It is often followed by the message:

***WARNING*** STEP REDUCTION IN PROGRESS (NONLCT PROCESSOR)

Frequent causes and remedies of convergence problems 

Obtaining a converged solution in a nonlinear analysis is dependent on appropriate data in both the nonlinear control settings as well as the model definition itself. The user area section "how to perform a nonlinear analysis" gives more details on many aspects involved in nonlinear analyses.

Search in the online help for "Nonlinear Solution Procedures" for general nonlinear information and for "Analysis CONTROL" to display specific information on the meaning of the fields in the nonlinear control form. The dialog help is also of use. Select:

Load case properties> Nonlinear & Transient> Nonlinear> Help...

- this is context sensitive and should be tried on each of the nonlinear dialog forms.


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