OOF2: The Manual
| Adaptive (BasicAdaptiveDriver) | ||
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6.5.2. Subclasses |  |
Name
Adaptive (BasicAdaptiveDriver) — Take variable sized time steps.
Synopsis
BasicAdaptiveDriver(tolerance,minstep)
Details
-
Base class:
BasicStepDriver -
Parameters:
tolerance- Maximum permissable error. Type: A real number.
minstep- Minimum time step size. Type: A real number.
Description
Using BasicAdaptiveDriver as the
time_stepper in BasicSolverMode tells OOF2 to solve a time
dependent problem using adaptive stepping, in which the step size is
adjusted to keep the estimated error below the given
tolerance. If that is not possible without using
timesteps smaller than minstep, an error will be
raised and the calculation will be aborted.
Adaptive stepping requires more computation per step than uniform stepping, but can be much more accurate and efficient, especially if the optimal step size changes during a calculation.
BasicAdaptiveDriver automatically uses the
SS22 method with
theta1=theta2=0.5
if the equations contain second order time derivatives.
It uses CrankNicolson otherwise.
In both cases, the time step control and error estimation are
handled by TwoStep and AbsoluteErrorScaling.
AdaptiveDriver plays the same role
in AdvancedSolverMode that
BasicAdaptiveDriver plays in BasicSolverMode.
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| Badly Shaped Elements (BadlyShapedElements) |  |
Direct (BasicDirect) |