[Nek5000-users] New Recycling BC method?

Sun Jun 20 20:21:47 CDT 2010

Hi Paul,

It was for testing purposes. Thanks for the update!

- Michael

On Jun 20, 2010, at 8:12 PM, nek5000-users at lists.mcs.anl.gov wrote:

>
> Hi Michael,
>
> We're working on an interpolation-based approach.
>
>> From the file you sent I can see that it could in general
> be confusing w/ the old approach.
>
> Paul
>
> PS - was the file you sent just a test, or for production
>     purposes?  I think more refinement near the walls would
>     normally be in order.
>
>
>
> On Sun, 20 Jun 2010, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi Paul,
>>
>> Were you able to find a solution for this?
>>
>> I was able to establish a new connectivity matrix for connecting an  
>> arbitrary inlet plane to an outflow plane that you specifiy by a  
>> number of elements. This could be called once at the beginning. I'm  
>> not sure how to use it though but it is a positive start.
>>
>> - Michael
>>
>> On Jun 16, 2010, at 10:00 PM, nek5000-users at lists.mcs.anl.gov wrote:
>>
>>> Sounds great!  Thanks for looking into this!
>>> - Michael
>>> ----- Original Message -----
>>> From: nek5000-users at lists.mcs.anl.gov
>>> To: nek5000-users at lists.mcs.anl.gov
>>> Sent: Wednesday, June 16, 2010 9:58:53 PM GMT -06:00 US/Canada  
>>> Central
>>> Subject: Re: [Nek5000-users] New Recycling BC method?
>>> Michael, got it... I should be able to send a fix by morning that  
>>> will work for any instances in which slab at location A has same  
>>> (arbitrary) topology orientation as slab at location B, as is the  
>>> case in the example you sent. This won't cover all cases but would  
>>> likely cover 90%. hth, Paul On Wed, 16 Jun 2010, nek5000-users at lists.mcs.anl.gov 
>>>  wrote: > > > Paul, > > > > See attached for the rea. Thanks, > >  
>>> > > Michael > > > ----- Original Message ----- > From: nek5000-users at lists.mcs.anl.gov 
>>>  > To: nek5000-users at lists.mcs.anl.gov > Sent: Wednesday, June 16,  
>>> 2010 9:47:29 PM GMT -06:00 US/Canada Central > Subject: Re:  
>>> [Nek5000-users] New Recycling BC method? > > 960 is ok On Wed, 16  
>>> Jun 2010, nek5000-users at lists.mcs.anl.gov wrote: > > > Paul, > > >  
>>> > The rea I have now from matlab/gambit has 960 elements.  Do you  
>>> want me to create another, smaller rea that may make it easier to  
>>> work with? > > > > The geometry by the way is a simple pipe flow.  
>>> > > > > - Michael > > > ----- Original Message ----- > From: nek5000-users at lists.mcs.anl.gov 
>>>  > To: nek5000-users at lists.mcs.anl.gov > Sent: Wednesday, June 16,  
>>> 2010 9:39:59 PM GMT -06:00 US/Canada Central > Subject: Re:  
>>> [Nek5000-users] New Recycling BC method? > > Hi Micheal, I agree  
>>> completely that it's best to avoid mix & match meshing. If you  
>>> want to send me a gzipped .rea file produced by Gambit, I can take  
>>> a look and see if I have any ideas. Paul On Wed, 16 Jun 2010, nek5000-users at lists.mcs.anl.gov 
>>>  wrote: > > > Hi Paul, > > > > Thanks for the reply.  The reason  
>>> for the interest is due to the Gambit to Nek matlab code. We have  
>>> had great success importing complex geometries with it, but no w  
>>> we run into the issue of the recycling boundary condition.   
>>> Gambit's ordering of the elements is not always consistent which  
>>> makes it impossible to use the current technique. > > > > Our  
>>> solution was to create the portion that has the recycling in prex  
>>> and then merge it with the complex part created in Gambit.  
>>> However, this is proving to be very time consuming and troublesome  
>>> (Element Mismatch Errors).  So, to avoid this I would like to come  
>>> up with a new recycling method that does not depend on the  
>>> elements being in a specific order. My u nderstanding is that the  
>>> current method looks at the inflow, counts a certain number of  
>>> elements up, copies this outflow from face 6 and puts it back into  
>>> the inflow face 5. > > > > What I would like to do is replace how  
>>> the inflow plane is connected to the outflow plane. My idea was to  
>>> use the connectivity matrix to figure out what the element numbers  
>>> and outflow faces are at a certain distance away from the inflow  
>>> plane, and use t hese faces to connect.  The cross-section for the  
>>> inflow and outflow plane would be the same, but you couldn't  
>>> necessarily say that it is located, say inflow + 30 elements for  
>>> example, OR that the outflow and inflow faces are all the same  
>>> (face 5 for inflow, face 6 for outflow for example).  > > > > Do  
>>> you think this is possible? In a way, you would be creating a new  
>>> connectivity matrix that governs the recycling BC. > > > > Thanks!  
>>> > > - Michael M. > > > ----- Original Message ----- > From:  
>>> nek5000-users at lists. mcs . anl .gov > To: nek5000-use rs at lists.  
>>> mcs . anl .gov > Sent: Wednesday, June 16, 2010 9:08:00 PM GMT  
>>> -06:00 US/Canada Central > Subject: Re: [Nek5000-users] New  
>>> Recycling BC method? > > Hi Michael, Access to the connectivity  
>>> array wouldn't help in this case, given that the recycling bc  
>>> needs to establish a _new_ connectivity that has nothing to do  
>>> with the existing one. The examples use this approach of  
>>> establishing a new connectivity. I'm confident that we ca n make  
>>> the existing approach for any mesh that can legitimally employ the  
>>> recycling bc - i.e., any mesh that has the same cross-sectional  
>>> distribution of elements at the two planes of interest. An  
>>> alternative is to use the general purpose interpolation routines.  
>>> There may (or may not) be a performance issue -- we're looking  
>>> into this w/ the help of a summer student. Please let me know if I  
>>> can assist you w/ your specific case. Paul > I am still trying to  
>>> figure this idea out, but I think I would need to > access the  
>>> connectivity/boundary condition information that is contained > in  
>>> the rea file. Does anyone know the array, or what to call in order  
>>> to > access this in the usr file?  Thanks again for a ny help! > >  
>>> > > - Michael M. > > > ----- Original Message ----- > From:  
>>> nek5000-users at lists. mcs . anl .gov > To: " Nekton User List" >  
>>> Sent: Tuesday, June 15, 2010 9:02:00 PM GMT -06:00 US/Canada  
>>> Central > Subject: [Nek5000-users] New Recycling BC method? > > >  
>>> > > Hello All, > > > > I am wondering if there is another  
>>> technique to set up a recycling boundary condition that does not  
>>> depend on the elements being in a certain order (say based on  
>>> element coordinates for instance)?   I would like to pick the  
>>> recycling plane based on a given offset distance rather than a  
>>> number of elements. > > > > Also, the outflow plane faces may not  
>>> all necessarily be face 6 (and face 5 for the inflow plane). > > >  
>>> > I have tried going through the examples where a recycling BC is  
>>> used however I am finding it difficult to understand as my  
>>> knowledge of Fortan is still growing. Thanks for any help anyone  
>>> can provide with this idea. > > > > Regards, > > Michael M. > >  
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