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<p style="margin-top:0;margin-bottom:0">Attached is a .usr with turb_outflow that works for this case---there is </p>
<p style="margin-top:0;margin-bottom:0">no difficulty if you use the prescribed input values, as shown in the attached</p>
<p style="margin-top:0;margin-bottom:0">files.</p>
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<p style="margin-top:0;margin-bottom:0">Here is a movie of the result - you can see that turb_outflow is turned on prior to the jet reaching the top of the domain.</p>
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<a href="http://mcs.anl.gov/~obabko/jet_vm.mpeg" class="m_-1009036803942863528OWAAutoLink" id="LPlnk833425" target="_blank" data-saferedirecturl="https://www.google.com/url?hl=en&q=http://mcs.anl.gov/~obabko/jet_vm.mpeg&source=gmail&ust=1517688939630000&usg=AFQjCNFIRGm1LI0WAc0nTY9OQrSpve_CLg" style="color: rgb(17, 85, 204);" previewremoved="true">http://mcs.anl.gov/~<span class="il">obabko</span>/<wbr>jet_vm.mpeg</a><br>
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<p style="margin-top:0;margin-bottom:0">This mesh is a bit under-resolved in the z-direction.</p>
<p style="margin-top:0;margin-bottom:0">The files for a new case, with more axial resolution, are posted here</p>
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<p style="margin-top:0;margin-bottom:0"><a href="http://www.mcs.anl.gov/~fischer/jet2.tgz" class="OWAAutoLink" id="LPlnk19082" previewremoved="true">www.mcs.anl.gov/~fischer/jet2.tgz</a></p>
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<p style="margin-top:0;margin-bottom:0">I'll be posting an example with a script on how to build this geometry to nekexamples soon.</p>
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<p style="margin-top:0;margin-bottom:0">Paul</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> 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>Sent:</b> Friday, February 2, 2018 1:10:32 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] Outflow Boundary Condition Clarification</font>
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<div dir="ltr">Im trying to simulate the formation of shear layer when a jet exits a nozzle and enters the flow domain. As the FIRST vortex leaves the outlet ( at which I have provided 'O' boundary condition using genbox) the solution diverges. I tried to implement
the 'turbulent outflow' subroutine as suggested in the forum but now the vortex affects the upstream flow. But when I run the flow past circular cylinder example, the vortices leave the domain without any issue even though only 'O' boundary condition is used'.
What is the difference between the two cases and what can i do to prevent the issue?<br clear="all">
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<div dir="ltr">Nitish Kovalam
<div>Aerospace Engineering</div>
<div>Indian Institute of Space Science and Technology</div>
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