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Can you show the outputs of -ts_monitor for both cases (one with oscillations and one without)?
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<div class="">Thanks,</div>
<div class="">Hong<br class="">
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<blockquote type="cite" class="">
<div class="">On Dec 13, 2018, at 9:48 AM, <a href="mailto:Moritz.Huck@isea.rwth-aachen.de" class="">
Moritz.Huck@isea.rwth-aachen.de</a> wrote:</div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Hi,<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Sure after reaching a steady state it looks like this:<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 3.767377637168e-03 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 2.529971638368e-05 <o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 2 SNES Function norm 4.433873358247e-09 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 3 SNES Function norm 4.535675922104e-11 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 9.898938706929e-04 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 1.322473621975e-05 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 2 SNES Function norm 1.672724799379e-09 <o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 3 SNES Function norm 1.338501638801e-11 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 1.624500221071e-03 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 2.448515345247e-05 <o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 2 SNES Function norm 6.225549426481e-09 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 3 SNES Function norm 1.062516222150e-10 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 4 SNES Function norm 6.493758120241e-13 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 1.106311709708e-03 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 2.475673243430e-05 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 2 SNES Function norm 9.969586735411e-09 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 3 SNES Function norm 2.479591395229e-10 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 4 SNES Function norm 1.542689576708e-12 <o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 6.070943996748e-04 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 1.648134285171e-05 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 2 SNES Function norm 8.461078655420e-09 <o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 3 SNES Function norm 2.480863447790e-10 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 4 SNES Function norm 1.513977618851e-12 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> TSAdapt basic arkimex 0:4 step 15 accepted t=5.67201 + 4.328e+00 dt=4.687e+00 wlte$<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">0.477 wltea= -1 wlter= -1 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">If I set the next target time (in tssolve) to be tlast+1e-3 it looks like this:<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 4.734802409365e-03 <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 6.173939866359e-13<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 5.633294284900e-04<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 3.575533754564e-13<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 9.651618110271e-04<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 6.863177319359e-13<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 7.706102281617e-04<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 8.490865565002e-13<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 0 SNES Function norm 5.028108294534e-04<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> 1 SNES Function norm 6.905750968862e-13<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""> TSAdapt basic arkimex 0:4 step 16 accepted t=10 + 1.000e-03 dt=2.612e-03 wlte$<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">0.0141 wltea= -1 wlter= -1<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">The SNES solver has a atoll of 1e-10, setting the atoll to lower values does not change the result.<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Thank you,<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Moritz<o:p class=""></o:p></span></div>
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<span lang="EN-US" class=""><o:p class=""> </o:p></span></div>
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<b class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">Von:</span></b><span style="font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="Apple-converted-space"> </span>Zhang, Hong <<a href="mailto:hongzhang@anl.gov" class="">hongzhang@anl.gov</a>><span class="Apple-converted-space"> </span><br class="">
<b class="">Gesendet:</b><span class="Apple-converted-space"> </span>Donnerstag, 13. Dezember 2018 16:42<br class="">
<b class="">An:</b><span class="Apple-converted-space"> </span>Huck, Moritz <<a href="mailto:Moritz.Huck@isea.rwth-aachen.de" class="">Moritz.Huck@isea.rwth-aachen.de</a>><br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:petsc-users@mcs.anl.gov" class="">petsc-users@mcs.anl.gov</a><br class="">
<b class="">Betreff:</b><span class="Apple-converted-space"> </span>Re: [petsc-users] Solution "jumps" after setting timestep<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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Can you please add command line options -ts_monitor -snes_monitor and show us the outputs? <span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
Thanks,<o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
Hong (Mr.)<o:p class=""></o:p></div>
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<br class="">
<o:p class=""></o:p></div>
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On Nov 4, 2018, at 6:19 AM, Moritz.Huck--- via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" style="color: purple; text-decoration: underline;" class="">petsc-users@mcs.anl.gov</a>> wrote:<o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<o:p class=""> </o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">
<span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">Hi,<span class="apple-tab-span"><o:p class=""></o:p></span></span></div>
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<span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class=""><br class="">
I using the basic adaptor.<br class="">
If I let the adaptor handle everything it does not oscillates.<br class="">
I don’t mean setting the timestep at the start (which does not produces the<br class="">
problem),<br class="">
I need to set during runtime between two steps.<br class="">
<br class="">
Best Regards,<br class="">
<br class="">
Moritz<br class="">
<br class="">
-----Ursprüngliche Nachricht-----<br class="">
Von: Constantinescu, Emil M. <</span><a href="mailto:emconsta@anl.gov" style="color: purple; text-decoration: underline;" class=""><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">emconsta@anl.gov</span></a><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">><span class="apple-converted-space"> </span><br class="">
Gesendet: Samstag, 3. November 2018 15:43<br class="">
An: Huck, Moritz <</span><a href="mailto:Moritz.Huck@isea.rwth-aachen.de" style="color: purple; text-decoration: underline;" class=""><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">Moritz.Huck@isea.rwth-aachen.de</span></a><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">>;<span class="apple-converted-space"> </span></span><a href="mailto:petsc-users@mcs.anl.gov" style="color: purple; text-decoration: underline;" class=""><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">petsc-users@mcs.anl.gov</span></a><span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class=""><br class="">
Betreff: Re: [petsc-users] Solution "jumps" after setting timestep<br class="">
<br class="">
On 11/3/18 4:56 AM, Moritz.Huck--- via petsc-users wrote:<br style="caret-color: rgb(0, 0, 0); font-variant-caps: normal; text-align: start; -webkit-text-stroke-width: 0px; word-spacing: 0px;" class="">
<br class="">
</span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">Hi,<br class="">
<br class="">
I am using the IMEX Runge Kutta to solve an implicit DAE (G=0).<br class="">
<br class="">
When I manually set the time step (TSSetTimestep) my solution jumps.<o:p class=""></o:p></span></div>
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<span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class=""><br class="">
When you don't set the time step, does it still oscillates? If not, can you<br class="">
check if it oscillates when reducing the fixed initial time step?<span class="apple-converted-space"> </span><br class="">
Did you turn the adaptivity off (-ts_adapt_type none)?<br class="">
<br class="">
Emil<br class="">
<br class="">
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<span style="font-size: 10.5pt; font-family: Verdana, sans-serif;" class="">If I go from a steady state to the same state, it oscillates a few<span class="apple-converted-space"> </span><br class="">
time and comes back to the steady solution.<br class="">
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Can this be prevented?<br class="">
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Thank you,<br class="">
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Moritz</span></div>
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