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<p style="margin-top:0;margin-bottom:0">Dear Nicolas,</p>
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<p style="margin-top:0;margin-bottom:0">For time-dependent boundary conditions, you could</p>
<p style="margin-top:0;margin-bottom:0">use something like the expression you have in your email.</p>
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<p style="margin-top:0;margin-bottom:0">You would need "t " ( "tee" space space) for the thermal</p>
<p style="margin-top:0;margin-bottom:0">boundary conditions in your .rea or .box file.</p>
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<p style="margin-top:0;margin-bottom:0">Please let me know if this solves your problem.</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> Monday, May 14, 2018 5:26:23 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] Temperature Perturbation Zone</font>
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<div>Hi,</div>
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<div>I'm setting a 3D box to perform natural convection problems in a closed cavity. After trying several method i can't manage to define a zone with a variable temperature perturbation in the usrchk() routine.<br>
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<div>Let's say, that temp = temp + A*sin(w*time) in a square of boundaries [x_min, x_max] x [y_min, y_max] x [z_min, z_max] for x, y, z.</div>
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<div>Any advice for implementing this?<br>
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<div>Regards,<br>
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<div dir="ltr"><b>Nicolás Andrés Órdenes Leiva</b>
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<div>Estudiante de Ingeniería Civil Mecánica</div>
<div>Universidad Técnica Federico Santa María</div>
<div>Tel: +56 9 7619 2857</div>
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