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Dear Agnese,
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<div>Sorry for the long delay in answering this question. The issue is that in fact it is possible</div>
<div>(and used to be a supported but rarely used feature). The challenge, however, is how to</div>
<div>make it relatively easy in the context of the current setup for a variety of applications.</div>
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<div>Nek supports a different gather-scatter handle for each field (velocity, temperature, passive</div>
<div>scalar, etc.)</div>
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<div>We have a handle that allows the user access to the connectivity list, which would give</div>
<div>you an opportunity to "disconnect" the periodic faces for the temperature array.</div>
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<div>I'll try to code up an example for the case of channel flow with a mesh generated by</div>
<div>genbox and post it shortly.</div>
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<div>Incidentally, an alternative approach that we often use for more complex domains</div>
<div>would be to use a recycling boundary condition. I think it would not be as efficient,</div>
<div>however, as periodicity for the case that you propose.</div>
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<div>Once again, apologies for the delayed response.</div>
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<div>Paul</div>
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<div id="divRpF470953" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> nek5000-users-bounces@lists.mcs.anl.gov [nek5000-users-bounces@lists.mcs.anl.gov] on behalf of nek5000-users@lists.mcs.anl.gov [nek5000-users@lists.mcs.anl.gov]<br>
<b>Sent:</b> Thursday, December 22, 2016 4:38 AM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] double mesh ?<br>
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<div>Hi
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<div class="">i am quite new, so i’m sorry if i’m getting things wrong.</div>
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<div class="">I am trying to simulate a turbulent channel flow, with a passive scalar. </div>
<div class="">in the streamwise direction, i would like to impose periodic boundary conditions for the flow, and non-periodic for the scalar.</div>
<div class="">in fact the scalar has a point source near the inlet, and i want to see how that develops downstream. </div>
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<div class="">as far as i understand this is not supported by nek5000, because the last mesh point is identified with the first mesh point when periodic BC are imposed.</div>
<div class="">correct ?</div>
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<div class="">my question is : could i define two meshes, one for the scalar and one for the velocity ?</div>
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<div class="">thanks a lot for your help !!!</div>
<div class="">agnese</div>
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<div class="">Agnese Seminara</div>
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<div class="">CNRS</div>
<div class="">Laboratoire de physique de la matière condensée</div>
<div class="">Parc Valrose </div>
<div class="">avenue J Vallot</div>
<div class="">06108 Nice, France</div>
<div class=""><span class="" style="color:rgb(38,48,51); font-family:Arial,Helvetica,sans-serif; background-color:rgb(255,255,255)">+33 (0) 492 076 775</span></div>
<div class=""><a href="http://sites.unice.fr/site/aseminara/" class="" target="_blank">http://sites.unice.fr/site/aseminara/</a></div>
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