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    • Carsten Gräser's avatar
      Add projection and damping to acceleration · d07f80d3
      Carsten Gräser authored
      Implement damping using the directional restriction.
      
      Now the "coarse correction" solver is an inexact
      CG with ILU0 preconditioner. We only use a small number
      of CG steps such that CGs rate will dominate the nonlinear
      iteration.
      d07f80d3
    • Carsten Gräser's avatar
      Experimental implementation of a NonlinearGSStep · fb13c8a4
      Carsten Gräser authored
      This may serve as model for the planned TNNMG cleanup.
      Besided a general nonlinear GS step this also provides
      an accelerated version.
      
      The added test implements a simple TNNMG-like acceleration
      with exact coarse solver (line search is still missing).
      In fact this is just a special active set method.
      fb13c8a4