[Nek5000-users] double mesh ?

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

Dear Paul 

thank you so much for your help !
I am looking forward to see your example, it will be of great help !

could you tell me something more about the recycling BC as well ?

Thank you again for your help 
Agnese

> 
> From: nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>
> Subject: Re: [Nek5000-users] double mesh ?
> Date: January 16, 2017 at 4:05:21 PM GMT+1
> To: "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>" <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>>
> Reply-To: nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>
> 
> Dear Agnese,
> 
> Sorry for the long delay in answering this question.  The issue is that in fact it is possible
> (and used to be a supported but rarely used feature).   The challenge, however, is how to
> make it relatively easy in the context of the current setup for a variety of applications.
> 
> Nek supports a different gather-scatter handle for each field (velocity, temperature, passive
> scalar, etc.)
> 
> We have a handle that allows the user access to the connectivity list, which would give
> you an opportunity to "disconnect" the periodic faces for the temperature array.
> 
> I'll try to code up an example for the case of channel flow with a mesh generated by
> genbox and post it shortly.
> 
> Incidentally, an alternative approach that we often use for more complex domains
> would be to use a recycling boundary condition.   I think it would not be as efficient,
> however, as periodicity for the case that you propose.
> 
> Once again, apologies for the delayed response.
> 
> Paul
> 
> From: nek5000-users-bounces at lists.mcs.anl.gov <mailto:nek5000-users-bounces at lists.mcs.anl.gov> [nek5000-users-bounces at lists.mcs.anl.gov <mailto:nek5000-users-bounces at lists.mcs.anl.gov>] on behalf of nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>[nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>]
> Sent: Thursday, December 22, 2016 4:38 AM
> To: nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov>
> Subject: [Nek5000-users] double mesh ?
> 
> Hi
> 
> i am quite new, so i’m sorry if i’m getting things wrong.
> 
> I am trying to simulate a turbulent channel flow, with a passive scalar. 
> in the streamwise direction, i would like to impose periodic boundary conditions for the flow, and non-periodic for the scalar.
> in fact the scalar has a point source near the inlet, and i want to see how that develops downstream. 
> 
> as far as i understand this is not supported by nek5000, because the last mesh point is identified with the first mesh point when periodic BC are imposed.
> correct ?
> 
> my question is : could i define two meshes, one for the scalar and one for the velocity ?
> 
> thanks a lot for your help !!!
> agnese
> 
> 
> Agnese Seminara
> --------------------------------
> CNRS
> Laboratoire de physique de la matière condensée
> Parc Valrose 
> avenue J Vallot
> 06108 Nice, France
> +33 (0) 492 076 775
> http://sites.unice.fr/site/aseminara/ <http://sites.unice.fr/site/aseminara/>
> 
> 
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