f := zone.dynamic.timestep()
zone.dynamic.timestep() := f

Get/set the timestep used by the zone dynamic module when it is active. This may not be the timestep used, as other active modules may require a smaller timestep.

Returns:f - the current zone dynamic module timestep
Accepts:f - sets the current zone dynamic module timestep. This does not change any active automatic timestep calculations that may be active.