[Dune] [#1063] UGGrid parallel with cgstokes example (Attachment added)

[Dune]

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User who did this - Manuel Hofmann (mhofmann) 

Attached to Project - Dune
Summary - UGGrid parallel with cgstokes example
Task Type - Bug Report
Category - UG
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - Hi,

i tried to run the cgstokes example in pdelab-howto parallel. This example uses Taylorhood elements q2/q1 with uggrid. Im using the latest version of dune-grid/dune-geometry/... however I attached an older version of cg_stokes.hh of dune-pdelab because I modified it alot and didnt update my program to the new stokesparameter.hh

If i run this example with ISTLBackend_NOVLP_BCGS_NOPREC as linear solver it seems to work, however it converges really slow and even breaks down (ISTLError) at some point (but only after a few nonlinear iterations). If i use a preconditoned method like ISTLBackend_NOVLP_BCGS_SSORk i get a Dune::GridError at the first nonlinear iteration. I tracked it down and i think it happens in novlpistlsolverbackend.hh:line 1018, where the first linear system is being solved.

Oliver suggested I should file a bug if this still happens with an unrefined grid. I also attached an error logfile of the case with ISTLBackend_NOVLP_BCGS_SSORk as linear solver.



Am I doing anything wrong or is this still a bug of UGGrid?

Regards,
Manuel

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