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# TIME¶

Specifies the time step sizes and final simulation time.

## Required Cards¶

FINAL_TIME <float> <string>
Specified the final time of the simulation with units.

## Optional Cards:¶

Specifies that the simulation run in steady state mode with no time stepping (Warning: Experimental)
INITIAL_TIMESTEP_SIZE <float> <string>
Specifies the initial time step size
MINIMUM_TIMESTEP_SIZE <float> <string>
Specifies the minimum time step size. This minimum step size is used to softly exit the simulation when time step sizes are cut below this threshold. If TS_ACCELERATION from the TIMESTEPPER card is used, the step size will not drop below this threshold.
MAXIMUM_TIMESTEP_SIZE <float> <string> <optional string> <optional float> <optional string>

Specifies the maximum time step size. This maximum time step size can change during the simulation by adding the optional float/strings as follows:

MAXIMUM_TIMESTEP_SIZE <float> at <float> <string>  (See examples below)


## Examples¶

TIME
# total simulation length, the unit can be in h or y
FINAL_TIME 5200.0d0 h
# initial time step size, it could be reduced or increased automatically
# by the program for accuracy purpose
INITIAL_TIMESTEP_SIZE 1.d0 h
# maximum time step that can not be exceeded
MAXIMUM_TIMESTEP_SIZE 1.d0 h
END

# to specify an initial maximum time step size of 1 hour, decrease the
# time step size to 0.1 hours between 24 and 34 hours simulation time,
# and revert back to the original time step size afterwards
TIME
FINAL_TIME 96.0d0 h
INITIAL_TIMESTEP_SIZE 0.1d0 h
MAXIMUM_TIMESTEP_SIZE 1.d0 h at 0. h
MAXIMUM_TIMESTEP_SIZE 0.1d0 h at 24. h
MAXIMUM_TIMESTEP_SIZE 1.d0 h at 34. h
END