MFDTIME, DTIME, DTMIN, DTMAX, Carry
Sets time step sizes for an ANSYS Multi-field solver analysis.
DTIMEMulti-field time step size. If automatic time stepping
is being used [see Notes below], DTIME is
the starting time step.
DTMINMinimum time step. Defaults to DTIME.
DTMAXMaximum time step. Defaults to DTIME.
CarryTime step carryover key.
OFF | — | Use |
ON | — | Use the final time step from the previous run as the starting time step for the next restart run. |
This command specifies time step sizes for an ANSYS Multi-field solver analysis.
If either DTMIN or DTMAX is not equal to DTIME, auto time-stepping
is turned on for the multi-field loop. ANSYS will automatically adjust
the time step size for the next multi-field step between DTMIN and DTMAX, based on
the status of the current convergence, the number of target stagger
iterations (specified by MFITER), and the actual
number of iterations needed to reach convergence at the current time
step.
If auto time-stepping is turned off, the time step size must be evenly divisible into the end time (specified by MFTIME) minus the start time (0 for a new analysis or a restart time specified by MFRSTART).
You can use a smaller time step within each ANSYS field analysis. This is called subcycling. Use the DELTIM and AUTOTS commands to subcycle a structural, thermal, or electromagnetic analysis.
This command is also valid in PREP7.
See Multi-field Commands in the Coupled-Field Analysis Guide for a list of all ANSYS Multi-field solver commands and their availability for MFS and MFX analyses.
Distributed ANSYS Restriction This command is not supported in Distributed ANSYS.