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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=DE>Dear Dune-Developers,<o:p></o:p></span></p><p class=MsoNormal><span lang=DE><o:p> </o:p></span></p><p class=MsoNormal>I am a PhD Student at Uni Ulm working with the dune core library together with <code>dune-alugird</code> and <code>dune-multidomaingrid</code>. <o:p></o:p></p><p class=MsoNormal>Currently I try to do the parallelization of my FE solver and I want to use an AMG preconditioner. My current idea is, to use the AMG from <code>dune-istl</code>. I tried to transform the example from git in <code>dune-istl/dune/istl/paamg/test/parallelamgtest.cc</code>.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am not sure how to fill the parallel index set for the communication. Here are my questions:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Can I use <code>Dune::OwnerOverlapCopyCommunication</code><code><span style='font-size:10.0pt'>, </span></code><code>Dune::OverlappingSchwarzOperator </code>also for an unstructured mesh with no overlap of the cells? Due to the used finite element discretization there is an overlap of the degrees of freedom. <o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Is there any efficient way to fill the parallel index set? In the example this is done by hand but I am not sure how to do this on an unstructured mesh. <o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Is there any example where the paamg is used together with an unstructured mesh?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you very much for your help and best regards<o:p></o:p></p><p class=MsoNormal>Paul Maidl<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>