[Nek5000-users] Periodic BC on non-parallel boundaries

[nek5000-users at lists.mcs.anl.gov]

>From a quick scan of the code it looks like it would work for Pn/Pn-2
too. Not sure though. Is there anybody out there not using Pn/Pn? Just
kidding :)

Cheers
Stefan

On 10/10/11, nek5000-users at lists.mcs.anl.gov
<nek5000-users at lists.mcs.anl.gov> wrote:
>
> Yes -- I think it also needs to be Pn-Pn ? (Is this correct Stefan?)
>
> Thanks!
>
> Paul
>
>
> On Mon, 10 Oct 2011, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi David,
>>
>> What you need is a cyclic not periodic BC. They are similar but not
>> the same. There is one important assumption in the current
>> implementation: The normal vector of a cyclic boundary needs to be
>> plane and orthogonal to the Z-axis. Then, just set IFCYCLIC to true in
>> the logical switches of your rea-file and give it a whirl.
>>
>> Cheers,
>> Stefan
>>
>> On 10/10/11, nek5000-users at lists.mcs.anl.gov
>> <nek5000-users at lists.mcs.anl.gov> wrote:
>>> Hi neks,
>>>
>>> I would like to employ periodic boundary conditions on the sides of a
>>> slice
>>> of an annulus.  I have constructed this domain by deforming the domain
>>> [0,1]x[0,1] in userdat2.  Setting the initial domain up with periodic
>>> sides
>>> does not work.  I`m guessing this is because nek is trying to mathc x-
>>> and
>>> y-velocities at the boundaries, when really I need to match velocities in
>>> the normal and parallel directions.
>>>
>>> Is the P boundary condition unable to handle matching non-parallel
>>> boundaries, and if so is there a work-around?
>>>
>>> If this makes it easier, I can settle for having only 1/4, 1/2 and 3/4
>>> slices, so the BC`s amount to mappings of +/-u,v to +/- u,v.
>>>
>>> Thanks!
>>>
>>> David
>>>
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