Barry, Here is my output from my program with petsc-dev (txt files attached). Even with petsc-dev (revision 21929), SNES (I tried VISS and VIRS) takes a long time to converge (>50 iterations) from a small problem (99 HEX20 elements, 681 DOFs for SNES). The exodusII output files are uploaded in the link; I attached pictures of last time step for Psi field which we solve with SNESVI and u field which the displacement in the x-direction and is my loading. As it was the case with petsc-3.2 line search diverges as soon as we hit the lower bound in a neighborhood of nodes. I ran with KSPPREONLY and PCLU to exclude possibility of LS failure because of the KSP tol.
Best, Ata link to exodusII files: http://cl.ly/0g431o443v240x1h2h1B -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: output-viss.txt URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0002.txt> -------------- next part -------------- A non-text attachment was scrubbed... Name: axial-tension-virs-u.png Type: image/png Size: 10081 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0004.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: axial-tension-virs-psi.png Type: image/png Size: 10230 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0005.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: axial-tension-viss-psi.png Type: image/png Size: 10230 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0006.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: axial-tension-viss-u.png Type: image/png Size: 10081 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0007.png> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: output-virs.txt URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/937250a8/attachment-0003.txt>
