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<p class="MsoNormal">Jean,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I think what you want to do is to map the pressure on the velocity mesh. There is thread that explains how to do that:<o:p></o:p></p>
<p class="MsoNormal"><a href="https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2010-July/000767.html">https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2010-July/000767.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Since the pressure is discontinuous I am not sure the pressure field will be smooth on the velocity mesh, though.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Marco<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Nek5000-users <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of "nek5000-users@lists.mcs.anl.gov" <nek5000-users@lists.mcs.anl.gov><br>
<b>Reply-To: </b>"nek5000-users@lists.mcs.anl.gov" <nek5000-users@lists.mcs.anl.gov><br>
<b>Date: </b>Tuesday, February 13, 2018 at 10:54 AM<br>
<b>To: </b>nek5000-users <nek5000-users@lists.mcs.anl.gov><br>
<b>Subject: </b>[Nek5000-users] v17.0 vs v17.0.0.beta2 regarding Stress Formulation and Pn/Pn-2<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a name="_MailOriginalBody">Dear All, <o:p></o:p></a></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">I am using mixed 'W ' and 'SYM' boundary conditions on a boundary that is not aligned with x,y,z axes. (with IFSTRS=T)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">When using the previous v17.0.0.beta2 version, I could use these mixed boundary conditions with the Pn/Pn pressure formulation, giving a continuous pressure field.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">After upgrading to v17.0, I get a number of the following runtime errors when using Pn/Pn:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">---<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">Mixed B.C. on a side nonaligned with either the X,Y, or Z axis detected for<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"> Element 8 side 1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"> Requires PN/PN-2 STRESS FORMULATION<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">---<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">Pn/Pn-2 runs, as expected. Granted that I have to use Pn/Pn-2 for mixed BC when not aligned with an axis, the problem is that the pressure is discontinuous, which is stated in the documentation
for the Pn/Pn-2 formulation. This is evident when plotting the pressure in Visit. Is there a way to obtain a smooth (correct?) pressure field when using Pn/Pn-2? Or is there a way to use the Pn/Pn formulation with such boundary conditions?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody">Jean<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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