[timestepping] block

The block [timestepping] is used for the transient analysis. This block's layout looks as follows:

[timestepping]
  type=be
  dt=1.0e-5
  time=1.0e3
  adaptive=true
  optiters=3
  growthfactor=1.1
  cutfactor=0.85
  dtmin=1.0e-12
  dtmax=1.0e1
[end]

options

The type = option specifies the name of the time integration method one wants to use.

dt= specifies initial \(\Delta_{t}\). time= defines the final time.

adaptive=true enables the adaptive time stepping. It's disabled by default.

optiters= determines the critical nonlinear iterations for increasing or decreasing the \(\Delta_{t}\).

growthfactor= and cutfactor= represent the growth factor and cut back factor for adaptive time stepping, respectively.

dtmin and dtmax determine the minimum and maximum value of \(\Delta_{t}\).

supported time stepping method

The full list of the available time stepping method is:

type=be
type=cn
type=bdf2