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Oh my god, it was a bad one. Thanks for helping.</div>
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Sepideh<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Matthew Knepley <knepley@gmail.com><br>
<b>Sent:</b> Wednesday, February 3, 2021 12:14 PM<br>
<b>To:</b> Sepideh Kavousi <skavou1@lsu.edu><br>
<b>Cc:</b> Jed Brown <jed@jedbrown.org>; petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov><br>
<b>Subject:</b> Re: [petsc-users] SNES-norm is zero all the time</font>
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<div dir="ltr">On Wed, Feb 3, 2021 at 1:03 PM Sepideh Kavousi <<a href="mailto:skavou1@lsu.edu">skavou1@lsu.edu</a>> wrote:<br>
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I only have one field "names vx" and this variable change in both x and y directions. I have also chosen dof in DMDACreate2d to "1".
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I am not sure why I should have aF[i][j].vx. "i" defines the grids in x direction and "j" is in y-directions. In all my previous codes I define" aF[j][i].vx" and not "aF[i][j].vx", and it was working properly.</div>
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<div>To me, it looks like you have "jj"</div>
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<div> Matt</div>
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Best,</div>
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Sepideh<br>
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<div id="x_gmail-m_7812890000668533844divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Jed Brown <<a href="mailto:jed@jedbrown.org" target="_blank">jed@jedbrown.org</a>><br>
<b>Sent:</b> Wednesday, February 3, 2021 11:46 AM<br>
<b>To:</b> Sepideh Kavousi <<a href="mailto:skavou1@lsu.edu" target="_blank">skavou1@lsu.edu</a>>;
<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a> <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:</b> Re: [petsc-users] SNES-norm is zero all the time</font>
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<div>Sepideh Kavousi <<a href="mailto:skavou1@lsu.edu" target="_blank">skavou1@lsu.edu</a>> writes:<br>
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> I am not running an specific example. Attached is my code. and when I wun with<br>
> ./step5.out -snes_monitor -snes_fd_color -ts_monitor -snes_converged_reason -pc_type lu<br>
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> it seems it does not solve anything because the output is like:<br>
><br>
> 0 SNES Function norm 0.000000000000e+00<br>
> Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 0<br>
> 1 TS dt 0.005 time 0.005<br>
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Check your FormFunction for why af[][] is zero. I see<br>
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aF[j][j].vx<br>
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but you'll need to set at all the grid points, i.e., aF[j][i].vx and aF[j][i].vy.<br>
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-- <br>
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<div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener</div>
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