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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link="#0563C1" vlink="#954F72" style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear the maintainer of the PETSc: <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I am implementing the CPU parallel finite element calculation of the unstructured grids by using the great PETSc platform. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The unstructured grids are imported from other open access software, for example, Gmsh. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Herein we call the node numbering for the mesh generated by the Gmsh as the original ordering, before distributing the mesh to each processor. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>After distributing this unstructured mesh to each process, is it possible to find the mapping between the original ordering (before distributing) and the PETSc/global ordering (after distributing)? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>If yes, how to extract or find it? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>If no, could you give me some suggestions for better applying the displacement constraints and load boundary conditions? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Another question is how to distinguish the nodes subject to displacement boundary constraints and the nodes subject to the external force loads. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you very much. Looking forward to your reply.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Hui Liu<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Wuhan University<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>