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OALTS

Optimal A-stable Linear Two-Step Method

References:

  1. 10.1002/nme.6188
  2. 10.1002/nme.6623

Syntax

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integrator OALTS (1) [2]
# (1) int, unique integrator tag
# [2] double, spectral radius, default: 0.5

Remarks

This method is closely related to the Generalised-Alpha method (on first order ODEs). See the second reference for more details, also see 10.1016/j.compstruc.2017.08.013.

This method requires a fixed time step. The initial time step is used for time marching. For example,

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set ini_step_size 1E-2

The fixed_step_size command such as

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set fixed_step_size true

is not required and this flag is always true.

Accuracy Analysis

oalts-0.0 oalts-0.5 oalts-1.0