Hi Stefan,<br><br>I`ve got another question related to the periodic/cyclic BC`s. In addition to the partial 2D annulus, I`m also trying to simulate a 3D annular cylinder (a full 2ğ radians for now). I made the domain as I made the full 2D annulus, by remapping a periodic-side domain in userdat2. This worked in 2D, but in 3D the periodic BC are not working properly. Is this a case where cyclic BC would be needed, rather than periodic? I`m hoping not since I have stress-free walls, so I`m using Pn/Pn-2 again. (I tried the same setup with no-slip BC in the Pn/Pn formulation, and that did work properly.)<br>
<br>Thanks,<br><br>David<br><br>P.S. When I tried the 2D partial-annulus case with Pn/Pn, I accidentally had IFCYCLIC=F one time, and it still worked, so I can`t tell whether the cyclic feature is having an effect at all.<br>
<br><br><div class="gmail_quote">On Mon, Oct 10, 2011 at 2:20 PM, <span dir="ltr"><<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hmm, just had a look at the code. It looks to me that it might work<br>
out of the box. Why don't you give it a shot.<br>
<br>
Cheers<br>
<div><div></div><div class="h5">Sefan<br>
<br>
On 10/10/11, S K <<a href="mailto:stgeke@googlemail.com">stgeke@googlemail.com</a>> wrote:<br>
> Let me check what we need to change to make it happen.<br>
> -Stefan<br>
><br>
> On 10/10/11, <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a><br>
> <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>> wrote:<br>
>> Well then it seems I am stuck. Might a work-around be possible for a 1/4<br>
>> or<br>
>> 1/2 annulus? For instance with 1/2, I would just need to match (u,v) to<br>
>> (-u,-v).<br>
>><br>
>> David<br>
>><br>
>> On Mon, Oct 10, 2011 at 1:41 PM, <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>> wrote:<br>
>><br>
>>> btw: I am afraid, the stress formulation doesn't support cyclic BCs at<br>
>>> the moment!<br>
>>> -Stefan<br>
>>><br>
>>> On 10/10/11, S K <<a href="mailto:stgeke@googlemail.com">stgeke@googlemail.com</a>> wrote:<br>
>>> > You are right, it's an undocumented AND experimental feature. Just<br>
>>> > flag the boundaries as periodic. Yes, just add another IFCYCLIC line.<br>
>>> > Currently, there is no stress formulation support for Pn/Pn.<br>
>>> ><br>
>>> > -Stefan<br>
>>> ><br>
>>> > On 10/10/11, <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a><br>
>>> > <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>> wrote:<br>
>>> >> Hi Stephan,<br>
>>> >><br>
>>> >> I see, thanks. I can`t find any documentation about cyclic BC`s.<br>
>>> >> What<br>
>>> >> is<br>
>>> >> their symbol for the box file? Also, I don`t see a logical switch<br>
>>> >> for<br>
>>> >> IFCYCLIC. Do I just add another line?<br>
>>> >><br>
>>> >> Also, I have stress-free BC on curved boundaries. A series of error<br>
>>> >> messages led me to believe that I had to use the stress formulation,<br>
>>> >> and<br>
>>> >> that this required me to use Pn/Pn-2. Is this not the case?<br>
>>> >><br>
>>> >> Best,<br>
>>> >><br>
>>> >> David<br>
>>> >><br>
>>> ><br>
>>> _______________________________________________<br>
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>>><br>
>><br>
><br>
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