[Nek5000-users] Nek5000-users Digest, Vol 100, Issue 30
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Wed Jun 28 00:08:07 CDT 2017
Hi Jian,
Have a look at the "pipe" example.
I would expect the total element count to be about 10,000-30,000
for well resolved pipe flow at Re=5300.
There is a README on how to construct the mesh.
Please let me know if that helps...
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: Tuesday, June 27, 2017 7:06:09 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 30
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<mailto:nek5000-users-request at lists.mcs.anl.gov>> wrote:
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Today's Topics:
1. Re: Nek5000-users Digest, Vol 100, Issue 29
(nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>)
2. Re: Nek5000-users Digest, Vol 100, Issue 29
(nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>)
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Message: 1
Date: Mon, 26 Jun 2017 18:06:06 +0100
From: nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>
To: nek5000-users at lists.mcs.anl.gov<mailto: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<mailto:mailman.9646.1498496769.2967.nek5000-users at lists.mcs.anl.gov>>
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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 at lists.mcs.anl.gov>
> To: "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>>
> 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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Message: 2
Date: Mon, 26 Jun 2017 19:18:22 +0000
From: nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>
To: "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>>
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29
Message-ID:
<mailman.9661.1498504705.2967.nek5000-users at lists.mcs.anl.gov<mailto:mailman.9661.1498504705.2967.nek5000-users at lists.mcs.anl.gov>>
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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<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 12:06:06 PM
To: nek5000-users at lists.mcs.anl.gov<mailto: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 at lists.mcs.anl.gov><mailto:nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>>
To: "nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov><mailto: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><mailto:nek5000-users at lists.mcs.anl.gov<mailto: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<mailto:mailman.9625.1498490850.2967.nek5000-users at lists.mcs.anl.gov><mailto: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><mailto: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><mailto: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><mailto: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><mailto: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><mailto: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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