[Nek5000-users] Periodic bc for bent 2D channel

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

Hi Azad

I guess you're looking for a cyclic boundary condition. We implemented
something like this for 2D geometries some time ago.Just set the
logical flag IFCYCLIC to true in your rea-file and give it a whirl.

-Stefan

On 6/7/11, nek5000-users at lists.mcs.anl.gov
<nek5000-users at lists.mcs.anl.gov> wrote:
> Hello;
>
>
> I have a question regarding the Periodic BC in Nek5000. I already setup a
> simulation, it is a 2D channel generated by genbox. Using userdat2 I would
> be able able to bend it to (0,pi/2) as Half Arch with flow direction from
> up-left to right-bottom; however when I tried to run it, it seems the
> periodic bc do not take care of the change in the direction of the flow at
> the boundary. Now since the left-side periodic domain is in the same
> position as before, but the right-side one face downward with a 90 deg
> rotation, I would like to define the Periodic bc as
> (u_left,v_left)=(-v_right,u_right). Unfortunately after searching a lot in
> the source code I did not find any relevant information regarding this
> adjustment or at least re-define the Periodic bc. I really appreciate if you
> could help me by this.
>
>
> Many thanks
>
> Azad
>