[Nek5000-users] Nek5000-users Digest, Vol 100, Issue 30

Tue Jun 27 19:06:09 CDT 2017

Hi Paul,

I changed the elements in the straight pipe which is I am doing at the
moment. I set the horizontal and vertical axis as 14 spectral elements in
the quarter-section for the simulation at Re=5300 based on bulk velocity.
And the pipe length is 25R. Do you think it's enough to run the simulation?
By the way, I run the simulation for a short time, after which I used visit
to check the mesh finding that there are several things inside the pipe
which are likely to be walls. And I found the mesh in visit shows that the
cross-sectional views are different in the outlet and inlet which is open
or closed. I set the axis view in visit to not show the axis.

Kind regards,

Jian

On 27 June 2017 at 18:00, <nek5000-users-request at lists.mcs.anl.gov> wrote:

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>    1. Re: Nek5000-users Digest, Vol 100, Issue 29
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>    2. Re: Nek5000-users Digest, Vol 100, Issue 29
>       (nek5000-users at lists.mcs.anl.gov)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 26 Jun 2017 18:06:06 +0100
> From: nek5000-users at lists.mcs.anl.gov
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29
> Message-ID:
>         <mailman.9646.1498496769.2967.nek5000-users at lists.mcs.anl.gov>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Paul,
>
> Now the number of total elements is 576000 written in the rea file. By the
> way, would you please tell me the reason why only 1/1000 number of elements
> are needed indeed with SEM.
>
> Kind regards,
>
> Jian
>
>
> > Message: 2
> > Date: Mon, 26 Jun 2017 15:27:28 +0000
> > From: nek5000-users at lists.mcs.anl.gov
> > To: "nek5000-users at lists.mcs.anl.gov"
> >         <nek5000-users at lists.mcs.anl.gov>
> > Subject: Re: [Nek5000-users] genmap
> > Message-ID:
> >         <mailman.9625.1498490850.2967.nek5000-users at lists.mcs.anl.gov>
> > Content-Type: text/plain; charset="us-ascii"
> >
> >
> > Dear Jiang,
> >
> >
> > I think you have too many elements.  Keep in mind that with the SEM you
> > need about 1/1000th of the number of elements that you would for FEM.
> >
> >
> > What is the largest SEM run you have made so far?
> >
> >
> > Best, Paul
> >
> >
> > ________________________________
> > From: nek5000-users-bounces at lists.mcs.anl.gov <
> > nek5000-users-bounces at lists.mcs.anl.gov> on behalf of
> > nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> > Sent: Monday, June 26, 2017 8:49:06 AM
> > To: nek5000-users at lists.mcs.anl.gov
> > Subject: [Nek5000-users] genmap
> >
> > Hi Neks,
> >
> > Is there anyone know the reason for the following error, in which there
> > are hundred millions of grid points in the geometry.
> >
> >  ABORT: NELT>LELM, modify LELM in SIZE and recompile
> >
> > I changed the LELM to be big enough, even equals to 7000000000000, but it
> > doesn't work though. I guess the reasons would be:
> >
> > 1. genmap cannot regonize large elements mesh;
> > 2. I didn't get a recompilation after changing LELM parameter since I
> > don't know how to compile and thought genmap commond would be changed
> > automatically when the SIZE file in /home/bin/genmap was changed.
> >
> > Kind regards,
> >
> > Jian
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> > Nek5000-users mailing list
> > Nek5000-users at lists.mcs.anl.gov
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> ------------------------------
>
> Message: 2
> Date: Mon, 26 Jun 2017 19:18:22 +0000
> From: nek5000-users at lists.mcs.anl.gov
> To: "nek5000-users at lists.mcs.anl.gov"
>         <nek5000-users at lists.mcs.anl.gov>
> Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29
> Message-ID:
>         <mailman.9661.1498504705.2967.nek5000-users at lists.mcs.anl.gov>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Dear Jiang,
>
>
> If you run with lx1=10 you have 1000 points per element.
>
>
> FEM never runs with 10th order - the SEM is meant to do this.
>
>
> What is the largest SEM problem you have run so far?  I recommend starting
> with a sequence of small ones just to get used to the workflow.
>
>
> Paul
>
>
> ________________________________
> From: nek5000-users-bounces at lists.mcs.anl.gov <
> nek5000-users-bounces at lists.mcs.anl.gov> on behalf of
> nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> Sent: Monday, June 26, 2017 12:06:06 PM
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29
>
> Hi Paul,
>
> Now the number of total elements is 576000 written in the rea file. By the
> way, would you please tell me the reason why only 1/1000 number of elements
> are needed indeed with SEM.
>
> Kind regards,
>
> Jian
>
> Message: 2
> Date: Mon, 26 Jun 2017 15:27:28 +0000
> From: nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users@
> lists.mcs.anl.gov>
> To: "nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users@
> lists.mcs.anl.gov>"
>         <nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users@
> lists.mcs.anl.gov>>
> Subject: Re: [Nek5000-users] genmap
> Message-ID:
>         <mailman.9625.1498490850.2967.nek5000-users at lists.mcs.anl.gov
> <mailto:mailman.9625.1498490850.2967.nek5000-users at lists.mcs.anl.gov>>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Dear Jiang,
>
>
> I think you have too many elements.  Keep in mind that with the SEM you
> need about 1/1000th of the number of elements that you would for FEM.
>
>
> What is the largest SEM run you have made so far?
>
>
> Best, 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: Monday, June 26, 2017 8:49:06 AM
> To: nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov
> >
> Subject: [Nek5000-users] genmap
>
> Hi Neks,
>
> Is there anyone know the reason for the following error, in which there
> are hundred millions of grid points in the geometry.
>
>  ABORT: NELT>LELM, modify LELM in SIZE and recompile
>
> I changed the LELM to be big enough, even equals to 7000000000000, but it
> doesn't work though. I guess the reasons would be:
>
> 1. genmap cannot regonize large elements mesh;
> 2. I didn't get a recompilation after changing LELM parameter since I
> don't know how to compile and thought genmap commond would be changed
> automatically when the SIZE file in /home/bin/genmap was changed.
>
> Kind regards,
>
> Jian
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