SOLOPTION
SOLOPTION, Option,
Type, Value
Specifies solution transition options.
OptionTransition option:
STOT
—
Use criterion for transitioning from a static solution to a transient dynamic solution.
TTOS
—
Use criterion for transitioning from a transient dynamic solution to a static solution.
TTOT
—
Use criterion for transitioning from one time integration algorithm to another for a transient dynamic solution between load steps.
TypeAdditional input that varies depending on the
Optionvalue. See table below.ValueAdditional input that varies depending on the
OptionandTypevalues. See table below.
Option
Label | Type
= | Value
= | |||
|---|---|---|---|---|---|
| STOT (default) | CONV – Transition from a static solution to a transient solution when the static solution fails to converge (default). | Time integration scheme for the transient solution:
| |||
| FORC – Transition from a static solution to a transient solution upon reading this command (useful in forcing a transition during a restart). | |||||
| RBM – Transition from a static solution to a transient solution the first time the solution experiences rigid body motion, which is determined by maximum DOF increment. The transition occurs if the maximum DOF increment is more than the criterion specified (or the default) on the CUTCONTROL command. | |||||
| CONT – Transition from a static solution to a transient solution the first time any contact pair goes from having some points in contact to the entire pair being in a far-field status. | |||||
| TTOS | TIME – Time to spend in the transient solution before an attempt is made to come back into a static solution. | Time value | |||
| TTOT | FORC – Transition from one time integration algorithm to another upon reading this command. This option can be used between load steps or during restart. | Time integration scheme for the transient solution:
|
Notes
This command triggers an automatic transition from a static solution to a transient solution based on the specified criterion. The command is valid only in the solution processor (/SOLU) and must be defined either before the first SOLVE command or during a restart analysis.
If SOLOPTION is issued with no arguments specified, the static solution will transition to a quasi-static transient solution if the static solution fails to converge (that is, SOLOPTION,STOT,CONV,QUASI).
SOLOPTION can be used in a restart even if the base analysis did not include the command. Therefore, a problem that failed in the static analysis can be restarted using this command so that it transitions to a transient solution and solves further. Material densities are required for the transient solution, but they must be defined during the static solution since the restart framework does not permit material density to be defined in the restart analysis.
For more information on using SOLOPTION, see Automatic Transition Between Static and Transient Solutions in the Advanced Analysis Guide.