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# TIMESTEPPER¶

Specifies time step acceleration, maximum number of time steps, etc.

## Required Cards:¶

TIMESTEPPER <string>
Specifies the type of timestepper, where <string> is FLOW or TRANSPORT.

## Optional Cards:¶

NUM_STEPS_AFTER_CUT <int>
Number of time steps after a time step cut that the time step size must be held constant
MAX_STEPS <int>
Maximum time step after which the simulation will be terminated
TS_ACCELERATION <int>
Integer indexing time step acceleration ramp (expert users only). Use in conjunction with DT_FACTOR.
MAX_TS_CUTS <int>
Maximum number of consecutive time step cuts before the simulation is terminated with plot of the current solution printed to a XXX_cut_to_failure.tec file for debugging.
DT_FACTOR <float array>
Array of floating point numbers of tfac array (expert users only). Values specify time step multiplier as a function of number of Newton iterations in consecutive order from 1 Newton iteration to TS_ACCELERATION Newton iterations.
TIMESTEPPER FLOW