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Please send the list of your command line options and the screen output with -ts_monitor.
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<div class="">Hong (Mr.)<br class="">
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<div class="">On Apr 28, 2020, at 11:00 PM, Yingjie Wu <<a href="mailto:yjwu16@gmail.com" class="">yjwu16@gmail.com</a>> wrote:</div>
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<div style="margin: 0px; white-space: pre-wrap;" class="">Thank you very much for your reply.</div>
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<div style="margin: 0px; white-space: pre-wrap;" class="">I tried both switches, but unfortunately they didn't seem to meet my needs.</div>
<div style="margin: 0px;" class=""><span style="white-space:pre-wrap" class=""> </span><span style="white-space:normal" class="">-ts_adapt_always_accept </span> <span style="white-space:pre-wrap" class=""> The switch doesn't seem to work, reporting errors
when the maximum number of steps is reached without convergence, then the program exits.</span></div>
<div style="margin: 0px;" class=""> -ts_error_if_step_fails 0 <span style="white-space:pre-wrap" class=""> This switch accepts the non-convergence time step and outputs the result, but does not continue into the next time step calculation (</span><span style="white-space:pre-wrap" class="">
The time step hasn't reached the maximum time step I set</span><span style="white-space:pre-wrap" class="">).
</span><span style="white-space:pre-wrap" class=""></span><span style="white-space:pre-wrap" class="">And I wonder if the variable behind this switch is optional? What does it mean?</span></div>
<div style="margin: 0px; white-space: pre-wrap;" class="">I hope to achieve in the case of non-convergence Newton step( for example, the maximum number of Newton iteration steps reached -snes_max_it 50), can go in the next time step calculation.</div>
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<div style="margin: 0px;" class="">Thanks,</div>
<div style="margin: 0px;" class="">Yingjie</div>
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<div dir="ltr" class="gmail_attr">Zhang, Hong <<a href="mailto:hongzhang@anl.gov" class="">hongzhang@anl.gov</a>> 于2020年4月28日周二 下午10:51写道：<br class="">
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-ts_error_if_step_fails 0<br class="">
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You might want to find out why the nonlinear solver does not converge first. If you have a hand-written Jacobian, you can validate it with -snes_test_jacobian 1 (for a small test case).<br class="">
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Hong (Mr.)<br class="">
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> On Apr 28, 2020, at 8:21 AM, Yingjie Wu <<a href="mailto:yjwu16@gmail.com" target="_blank" class="">yjwu16@gmail.com</a>> wrote:<br class="">
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> Dear PETSc developers <br class="">
> Hi, <br class="">
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> I have recently used TS to solve nonlinear equations with time terms. since the convergence of my model is not very good, i would like to set to iterative fixed nonlinear steps per time step. If the problem does not meet the SNES convergence criteria after
fixed number of nonlinear steps , then go to the next time step calculation. I tried -snes_max_it , but didn't achieve the effect I wanted, and the program stopped after iterating the fixed number of steps. How should I set up in the program?<br class="">
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> Thanks,<br class="">
> Yingjie<br class="">
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