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Thanks for clarifying that.
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<div class="">So if I have my subdomain set as </div>
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<div class="">0 —— 1 —— 2 —— 3 —— 4 —— 5 —— 6</div>
<div class=""> | subdomain 1 | subdomain 2 | subdomain 1 |</div>
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<div class="">Should I actually make sure that I define 3 separate subdomains?</div>
<div class="">Currently, my subdomains are defined depending on a parameter of the system of PDEs I’m solving.</div>
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<div class="">Thanks,</div>
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<div class="">Simone </div>
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<div class="">On Sep 5, 2018, at 12:37 PM, Fande Kong <<a href="mailto:fdkong.jd@gmail.com" class="">fdkong.jd@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">On Wed, Sep 5, 2018 at 9:54 AM Smith, Barry F. <<a href="mailto:bsmith@mcs.anl.gov" class="">bsmith@mcs.anl.gov</a>> wrote:<br class="">
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2 should belong to one of the subdomains, either one is fine.<br class="">
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Barry<br class="">
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> On Sep 5, 2018, at 10:46 AM, Rossi, Simone <<a href="mailto:srossi@email.unc.edu" target="_blank" class="">srossi@email.unc.edu</a>> wrote:<br class="">
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> I’m trying to setup GASM, but I’m probably misunderstanding something.<br class="">
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> If I have this mesh<br class="">
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> 0 —— 1 —— 2 —— 3 —— 4<br class="">
> subdomain 1 | subdomain 2<br class="">
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<div class="">You may need to make a decision which subdomain ``2" belongs to. Most people just let the shared node go to the lower MPI rank. If so, in this example, ``2" belongs to the subdomain one. </div>
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<div class="">iis1 = {0, 1, 2}</div>
<div class="">ois = {0, 1, 2, 3}</div>
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<div class="">iis2 = {3, 4}</div>
<div class="">ois2 = {2, 3, 4}</div>
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<div class="">You consider seriously to use GASM, I would suggest to partition your problem (using ``hierach") in such a way that multi-rank subdomain is actually connected, otherwise you may end up having a deficient performance. </div>
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<div class="">Thanks,</div>
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<div class="">Fande,</div>
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> I create an interior (no overlap) and an outer (with overlap) IS for both subdomains.<br class="">
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> In my naive understanding<br class="">
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> iis1 = {0, 1}<br class="">
> ois1 = {0, 1, 2}<br class="">
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> and<br class="">
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> iis2 = {3, 4}<br class="">
> ois2 = {2, 3, 4}<br class="">
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> but then the node at the interface (node 2) does not belong to any interior IS. Should node 2 belong to both interior IS? Or should it belong only to one of the domains?<br class="">
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> Thanks,<br class="">
> Simone<br class="">
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> On Aug 15, 2018, at 22:11, Griffith, Boyce Eugene <<a href="mailto:boyceg@email.unc.edu" target="_blank" class="">boyceg@email.unc.edu</a>> wrote:<br class="">
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>>> On Aug 15, 2018, at 10:07 PM, Smith, Barry F. <<a href="mailto:bsmith@mcs.anl.gov" target="_blank" class="">bsmith@mcs.anl.gov</a>> wrote:<br class="">
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>>> Yes you can have "overlapping fields" with FIELDSPLIT but I don't think you can use FIELDSPLIT for your case. You seem to have a geometric decomposition into regions. ASM and GASM are intended for such decompositions. Fieldsplit is for multiple fields that
each live across the entire domain.<br class="">
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>> Basically there is one field the lives on the entire domain, and another field that lives only on a subdomain.<br class="">
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>> Perhaps we could do GASM for the geometric split and FIELDSPLIT within the subdomain with the two fields.<br class="">
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>>> Barry<br class="">
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>>>> On Aug 15, 2018, at 7:42 PM, Griffith, Boyce Eugene <<a href="mailto:boyceg@email.unc.edu" target="_blank" class="">boyceg@email.unc.edu</a>> wrote:<br class="">
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>>>> Is it permissible to have overlapping fields in FIELDSPLIT? We are specifically thinking about how to handle DOFs living on the interface between two regions.<br class="">
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>>>> Thanks!<br class="">
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>>>> — Boyce<br class="">
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