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iteration-based damping

joergbuchwald requested to merge joergbuchwald/ogs:improved_damping into master

This is an idea of an improved damping in which the damping is reduced (approaches 1) with every iteration. It can be set by setting the damping_reduction parameter in the project file. If the damping parameter should approach 1 within 7 iterations, the damping_reduction should be set to 7 etc.

I wonder whether this kind of damping handling could be useful for some problems, as it allows for setting very conservative choices while reducing the explosion of required iterations.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?

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