[Nek5000-users] Periodic Boundary Definition

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

Hi Friedrich,

Nek-MOAB implementation does not support periodic BCs since it was envisioned to work on Cubit meshes but Cubit could not guarantee exactly the same element face layout for the two boundaries so the grid point-to-gridpoint periodicity was impossible to implement.  Could you use an inlet and outlet BC instead?

Aleks




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From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Tuesday, October 21, 2014 10:23 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Periodic Boundary Definition


Hi All,


When using nek/moab how are the periodic boundaries to be defined?


Currently I have this:


channel.h5m
1 0      1 fluid set, 0 other/solid sets
10       fluid set #10,  solid sets #0
1        Material properties -fluid set #100: MATINDX of 1, All elements: IMATIE = 1
6        no. bc sets; bc set id, bc type: (f=flux, c=convective, t=dirichlet, I=adiabatic)
100  1    P  ,
200  1    P  ,
300  1    W  ,
400  1    W  ,
500  1    P  ,
600  1    P  ,


Boundaries 100 and 200 need to be defined periodic with one another...


I have experimented with:


100  1    P  ,  200  1
200  1    P  ,  100  1


and


100  1    200  1  P  ,
200  1    100   1 P  ,


Neither of which works, is there another implementation or is periodic boundary not possible?


Thanks, Friedrich.

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