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<div>Hi Simon,</div>
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<div>Breaking the symmetry is indeed a good idea in general. Although, at high Rayleigh numbers this is not entirely necessary in my experience. I typically don’t add any perturbations.</div>
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<div>I noticed a small typo in userf: “ffz = bouy”, not “ffz = buoy”.</div>
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<div>Also, you load a restart file in the .rea file. This will overload the initial conditions, T=-z, you have originally specified in useric.</div>
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<div>Regards,</div>
<div>Gijs</div>
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<div>On 08 May 2015, at 05:23, <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:</div>
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<div style="font-family: 'Times New Roman'; font-size: 16px;">Hi Simon,</div>
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<div style="font-family: 'Times New Roman'; font-size: 16px;">It's usually a good idea to break symmetry in some way in order to get the flow</div>
<div style="font-family: 'Times New Roman'; font-size: 16px;">to start moving. Usually that's done in useric by calling some type of random</div>
<div style="font-family: 'Times New Roman'; font-size: 16px;">number generator to put small amplitude disturbances into the field.</div>
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<div style="font-family: 'Times New Roman'; font-size: 16px;">Paul</div>
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<div id="divRpF784602" style="direction: ltr;"><font face="Tahoma" size="2"><b>From:</b><span class="Apple-converted-space"> </span><a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.mcs.anl.gov</a> [<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.mcs.anl.gov</a>]
on behalf of <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> [<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>]<br>
<b>Sent:</b><span class="Apple-converted-space"> </span>Thursday, May 07, 2015 8:17 PM<br>
<b>To:</b><span class="Apple-converted-space"> </span>nek5000-use.<br>
<b>Subject:</b><span class="Apple-converted-space"> </span>[Nek5000-users] Rayleigh example - no flow development<br>
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<div dir="ltr">Dear all neks,
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<div>Recently I have tried to modify the rayleigh example to my case. However, I discovered that no flow field is developed after a long time. All velocities are zero. I guess I miss something important in the example. Anyone knows which part of the code could
lead to this?<br>
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Also, although I start with T = -z, I got asymmetric initial condition, something not as I specified as viewed in postnek. Did I miss any point in the .rea and .usr? The files are attached here. They are modified rea and usr from rayleigh to my case.<br>
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Thank you very much.</div>
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<div>Regards,</div>
<div>Simon</div>
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