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

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

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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