[Nek5000-users] New Recycling BC based on interpolation

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

Hi,

no, I haven't done any speed comparison. So I take it there is no 
principal difference between intpts and gs_op in terms of computational 
cost?

I was referring to line 172f of the new recycling BC code:
"
       if (nelgt.ne.nelgv) call exitti
      $   ('ABORT: interp_v() nelgt.ne.nelgv not yet supported!$',nelgv)
"
and was wondering if that is due to something in intpts and if so, if 
the same constraint would apply to findpts.

Markus


nek5000-users at lists.mcs.anl.gov wrote:
> 
> Hi Markus,
> 
> I don't know why this wouldn't work for nelgt > nelgv.
> 
> I would say we don't know the performance hit yet - I think
> someone is looking into this question.  Performance will of course vary 
> significantly from problem to problem and platform
> to platform.   I suspect that it should not be a major hit ---
> have you observed otherwise?
> 
> Paul
> 
> 
> On Sat, 17 Jul 2010, nek5000-users at lists.mcs.anl.gov wrote:
> 
>> Hi Aleks,
>>
>> thanks for the code, I looked over it and have two questions:
>> -at some point, it is mentioned that this method does not work if 
>> nelgt>nelgv. Why is that? I am asking because this will be applied to 
>> a conjugate HT problem (although the recycling part is purely 
>> concerning flow+convection). Will this problem also occur when only 
>> findpts is used instead of intpts?
>> -is there a performance difference between calling intpts as opposed 
>> to gs_op (as is done in the turbJet example) every time step for large 
>> scale production runs? The latter is what I used in my version.
>>
>> Thanks,
>> Markus
>>
>>
>> nek5000-users at lists.mcs.anl.gov wrote:
>>> Hi Michael and Markus,
>>>
>>> Here is a test case for an unsteady pipe flow with Michael's 
>>> GambitPipe.rea file which sets inlet Recycling BCs based on 
>>> interpolation from a cross-section downstream that you specify by a 
>>> multiple of the inlet normal:
>>>
>>> http://www.mcs.anl.gov/~obabko/z4.tgz
>>>
>>>
>>> Let me know if you have any questions.
>>> Best,
>>> Aleks
>>>
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: nek5000-users at lists.mcs.anl.gov
>>> To: nek5000-users at lists.mcs.anl.gov
>>> Sent: Thursday, July 8, 2010 5:06:48 PM GMT -06:00 US/Canada Central
>>> Subject: Re: [Nek5000-users] New Recycling BC method?
>>>
>>>
>>>
>>>
>>>
>>> No worries, just checkin in to see how it was going, thanks for the 
>>> update! Look forward to trying it out!
>>>
>>> - Michael _______________________________________________
>>> Nek5000-users mailing list
>>> Nek5000-users at lists.mcs.anl.gov
>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>
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