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<p>Dave, Hong, thank you. Setting and getting the context from TS is definitely the way to go, as I have to compute an exchange of particle forces and geometry information. Working fine now.</p>
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<p>Christian</p>
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<div style="font-family:Helvetica; font-size:12px">_______________________________<br>
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<div style="font-family:Helvetica; font-size:12px">Christian Peco Regales, Ph.D. <br>
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<div style="font-family:Helvetica; font-size:12px">Postdoctoral Research Associate<br>
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<div style="font-family:Helvetica; font-size:12px">Civil and Environmental Engineering <br>
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<div style="font-family:Helvetica; font-size:12px">Pratt School of Engineering<br>
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<div style="font-family:Helvetica; font-size:12px">Duke University<br>
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<div style="font-family:Helvetica; font-size:12px">email: christian.peco@duke.edu<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Dave May <dave.mayhem23@gmail.com><br>
<b>Sent:</b> Wednesday, March 30, 2016 2:38 PM<br>
<b>To:</b> Christian Peco Regales, Ph.D.<br>
<b>Cc:</b> petsc-users@mcs.anl.gov<br>
<b>Subject:</b> Re: [petsc-users] TS prestep function</font>
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<div class="gmail_quote">On 30 March 2016 at 19:54, Christian Peco Regales, Ph.D.
<span dir="ltr"><<a href="mailto:cp226@duke.edu" target="_blank">cp226@duke.edu</a>></span> wrote:<br>
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<p>I have started to use the TS environment to solve a diffusion problem with XFEM in which, at the beginning of every step, a number of values have to be recomputed in order to properly fill the Jacobian (e.g. change some quadrature weights). However, I see
that the the function is expected with the format func(TS ts), with no possibility of getting a user context to perform the computations I need.</p>
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<div>There are a number of ways to get around this:<br>
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[1] Set an application context on the TS<br>
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<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSSetApplicationContext.html">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSSetApplicationContext.html</a><br>
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<div>and retrieve via<br>
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<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSGetApplicationContext.html">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSGetApplicationContext.html</a><br>
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<div>[2] It sounds like your information is related to geometry, so you could bundle it into a DM and use<br>
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<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSSetDM.html">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSSetDM.html</a><br>
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<div>[3] The "nastiest" way is to use<br>
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<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscContainerCreate.html#PetscContainerCreate">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscContainerCreate.html#PetscContainerCreate</a><br>
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<div>and then compose the PetscContainer object with the TS object via<br>
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<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscObjectCompose.html">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscObjectCompose.html</a><br>
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<div>Thanks,<br>
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<div> Dave<br>
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<p>Is there a way to get around that? Thanks!</p>
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<p>Christian <span> </span></p>
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<div style="font-family:Helvetica; font-size:12px">_______________________________<br>
</div>
<div style="font-family:Helvetica; font-size:12px">Christian Peco Regales, Ph.D. <br>
</div>
<div style="font-family:Helvetica; font-size:12px">Postdoctoral Research Associate<br>
</div>
<div style="font-family:Helvetica; font-size:12px">Civil and Environmental Engineering <br>
</div>
<div style="font-family:Helvetica; font-size:12px">Pratt School of Engineering<br>
</div>
<div style="font-family:Helvetica; font-size:12px">Duke University<br>
</div>
<div style="font-family:Helvetica; font-size:12px">2407 CIEMAS (office)<br>
</div>
<div style="font-family:Helvetica; font-size:12px">Durham, NC 27708, USA</div>
<div style="font-family:Helvetica; font-size:12px">email: <a href="mailto:christian.peco@duke.edu" target="_blank">
christian.peco@duke.edu</a><br>
</div>
<div style="font-family:Helvetica; font-size:12px">web: <a href="http://christianpeco.com" target="_blank">
http://www.christianpeco.com</a></div>
<div style="font-family:Helvetica; font-size:12px">_______________________________<br>
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