[Nek5000-users] New Recycling BC based on interpolation

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

Oh ok. 

Let's say that I leave one inlet as 'v ', but then change the other inlet to some other variable 'v1 ' or 'X ' or whatever. Would this be ok, without interfering with other routines? 

I suppose where this discussion is heading is: What is the possibility of adding a recycling boundary condition explicity in Nek, such that you can apply it like any other boundary condition, say R for example. So, in the routine you now search for this recycling flag 'R', and then run through the setup, rescale etc...? 

-Michael 

----- Original Message ----- 
From: nek5000-users at lists.mcs.anl.gov 
To: nek5000-users at lists.mcs.anl.gov 
Sent: Friday, July 16, 2010 4:47:11 PM GMT -06:00 US/Canada Central 
Subject: Re: [Nek5000-users] New Recycling BC based on interpolation 


Hi Michael, 

Use whatever discrimination you like --- I would not suggest 
modifying the character bcs, however, save that you can enter 
values in bc(k,f,e,1) for k > 1, for any cbc(f,e,1) = 'v ' 

The reason for this is that nek checks explicitly for cbc='v ' 
(v, followed by two spaces) in many locations. 

The correct place for discriminating parameters is in the 
arracy bc(). 

Normally I discriminate by geometry --- e.g., x < x0, or 
something similar, occasionally involving the unit normals on 
the face in question - as that can be a stronger discriminator. 

Paul 


On Fri, 16 Jul 2010, nek5000-users at lists.mcs.anl.gov wrote: 

> Hi Aleks, 
> 
> Thank you very much for looking into this. I already have a question; I noticed that you marked several notes dealing with "RBC single inlet -- modify for other cases". I am assuming this means that you have one inlet that you want to recycle, but another inlet that you do not want to recycle, which just happens to be my case. 
> 
> Can I distinguish in the rea between the two by "v1 " and "v2 " without giving genmap any problems, and then modify the checks in the usr file accordingly? Also, the subroutine rescale_inflow mentions to modify for multiple inlets as well but I do not see where any modification could/needs to be done for it. 
> 
> - Michael 
> 
> ----- Original Message ----- 
> From: nek5000-users at lists.mcs.anl.gov 
> To: nek5000-users at lists.mcs.anl.gov 
> Sent: Friday, July 16, 2010 3:03:52 PM GMT -06:00 US/Canada Central 
> Subject: [Nek5000-users] New Recycling BC based on interpolation 
> 
> 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 
> 
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> Nek5000-users at lists.mcs.anl.gov 
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