[Nek5000-users] New Recycling BC method?
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Sun Jun 20 20:12:14 CDT 2010
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. > > > > ___________________ ____________________________
>> Nek5000-users mailing list Nek5000-users at lists. mcs . anl .gov https
>> ://lists. mcs . anl .gov/mailman/ listinfo /nek5000-users >
>> _______________________________________________ Nek5000-users mailing list
>> Nek5000-users at lists. mcs . anl .gov https :/ /lists. mcs . anl
>> .gov/mailman/ listinfo /nek5000-users >
>> _______________________________________________ Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users >
>> _______________________________________________ Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>> _______________________________________________ Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>
>> _______________________________________________
>> Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
More information about the Nek5000-users
mailing list