[Nek5000-users] New Recycling BC method?
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Sun Jun 20 13:26:28 CDT 2010
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/nek5000-users/attachments/20100620/5571261e/attachment.html>
More information about the Nek5000-users
mailing list