Partial Dirichlet BC application

Christoph Lehmannrequested to merge
chleh/ogs:partial-dirichlet-application into master

With the changes from this MR the Dirichlet BC is only applied "partially", i.e., its application to the global matrix A is incomplete. This is done only if possible (i.e. if A from the previous iteration/timestep is identical and can be reused by the linear solver).

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

measurement result (the changes from this MR save time, indeed; and they don't have the high "system time" in the BiCGSTAB solver case)...

grafik

Edited by Christoph Lehmann

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