ansys.mapdl.core.Mapdl.nsubst

Mapdl.nsubst(nsbstp='', nsbmx='', nsbmn='', carry='', **kwargs)

Specifies the number of substeps to be taken this load step.

Mechanical APDL Command: NSUBST

Parameters:

nsbstpstr

Number of substeps to be used for this load step (that is, the time step size or frequency increment). If automatic time stepping is used ( autots ), NSBSTP defines the size of the first substep.

If contact elements ( TARGE169, TARGE170, CONTA172, CONTA174, CONTA175, or CONTA177 ) are used, defaults to 1 or 20 substeps, depending on the physics of the model. If none of these contact elements are used, defaults to 1 substep.

nsbmxstr

Maximum number of substeps to be taken (that is, the minimum time step size) if automatic time stepping is used. The program automatically determines the default based on the physics of the model.

nsbmnstr

Minimum number of substeps to be taken (that is, the maximum time step size) if automatic time stepping is used. The program automatically determines the default based on the physics of the model.

carrystr

Time step carryover key (program-determined default depending on the problem physics):

• OFF - Use NSBSTP to define time step at start of each load step.

• ON - Use final time step from previous load step as the starting time step (if automatic time stepping is used).

The program automatically determines the default based on the physics of the model.

Notes

See deltim for an alternative input. It is recommended that all fields of this command be specified for solution efficiency and robustness.

When the arc-length method is active ( arclen command), the NSBMX and NSBMN arguments are ignored.

Changing the number of substeps upon restarting an analysis during a load step is not recommended. You should only change the number of substeps between load steps.

This command is also valid in PREP7.