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

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

Hi Paul,

I am studying a particular sort of 2D convective flow that occurs in periodic-side boxes. It is seen most easily with free-slip velocity. I would like to find solutions of this type in a full annulus also, but I have had no luck with the parameters and IC's I've tried thus far. 

So, I want to try a piece of an annulus first, where I expect to find what I want more easily. Then I would work my way up to a full annulus. As I said before, 1/4, 1/2 and 3/4 would probably suffice if that were easier to implement.

But it sounds like this may be hard to do...

Best,

David



On Oct 10, 2011, at 10:16 PM, nek5000-users at lists.mcs.anl.gov wrote:

> 
> Hi David,
> 
> How much of a circular arc do you need?
> 
> Is there a compelling reason to not use a full arc?
> 
> Paul
> 
> 
> On Mon, 10 Oct 2011, nek5000-users at lists.mcs.anl.gov wrote:
> 
>> Hi Stefan,
>> 
>> I tried the cyclic BC with Pn/Pn-2, but it didn't work. Visualizing the results, the velocities do not seem to be properly matched, and the fields quickly blow up. To make sure I was doing the cyclic BC right, I changed to no-slip and tried it with Pn/Pn, and that worked, so I think Paul may have been right about cyclic BC no working with Pn/Pn-2. Do you think there is a way around this? I unfortunately need the stress-free boundaries or something similar.
>> 
>> Best,
>> 
>> David
>> 
>> 
>> 
>> 
>> 
>> On Oct 10, 2011, at 2:20 PM, nek5000-users at lists.mcs.anl.gov wrote:
>> 
>>> Hmm, just had a look at the code. It looks to me that it might work
>>> out of the box. Why don't you give it a shot.
>>> 
>>> Cheers
>>> Sefan
>>> 
>> 
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