New subject: Nek5000-users Digest, Vol 100, Issue 30

27 Jun 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, <[email protected]> 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
      ([email protected])
----------------------------------------------------------------------
Message: 1
Date: Mon, 26 Jun 2017 18:06:06 +0100
From: [email protected]
To: [email protected]
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29
Message-ID:
        <[email protected]>
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: [email protected]
To: "[email protected]"
        <[email protected]>
Subject: Re: [Nek5000-users] genmap
Message-ID:
        <[email protected]>
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: [email protected] <
[email protected]> on behalf of
[email protected] <[email protected]>
Sent: Monday, June 26, 2017 8:49:06 AM
To: [email protected]
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

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

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