OOF2: The Manual
Static (StaticDriver) — Solve a subproblem as a static or quasi-static system.
StaticDriver is the trivial subclass of StepDriver. It's used as the
time_stepper argument of AdvancedSolverMode when solving static or
quasi-static systems. Quasi-static systems are those in which the
beginning and end times are not identical, but
either the equations have to time derivatives, or the stepper is
static. The solution of a quasi-static system is a sequence of
static equilibrium solutions at different times.