OOF2: The Manual
Two Step (TwoStep) — Compare the results of one big step to two smaller steps, and adjust the step size to keep the difference within the given tolerance.
TwoStep is a QCTimeStepper, used to take time steps
with a measurable error estimate when solving a
Mesh. It appears as the
argument to AdaptiveDriver in
AdvancedSolverMode. In BasicSolverMode, it's used
TwoStep works by stepping over the interval
from time to time
twice, once in a single step of size and once in
two steps of size . The difference between the results is
a measure of the error incurred by the stepping method.
singlestep sets the TimeStepper for the individual steps.