[Nek5000-users] Nek5000-users Digest, Vol 73, Issue 10

[nek5000-users at lists.mcs.anl.gov]

Hi Philipp,

After changing the setting in 'Control/View', VisIt indeed read in the 8-byte output data. However, it seems there are still some problems visualising the data. It didn't show the contour plots properly when I created some slices. I guess we need to look forward to the next version as you mentioned.

Thank you very much for your help.

Best regards,
Tony

________________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of nek5000-users-request at lists.mcs.anl.gov <nek5000-users-request at lists.mcs.anl.gov>
Sent: 16 March 2015 17:00
To: nek5000-users at lists.mcs.anl.gov
Subject: Nek5000-users Digest, Vol 73, Issue 10

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Today's Topics:

   1. Re: Output data format and VisIt issue
      (nek5000-users at lists.mcs.anl.gov)


----------------------------------------------------------------------

Message: 1
Date: Sun, 15 Mar 2015 20:50:53 +0100
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Output data format and VisIt issue
Message-ID:
        <mailman.3586.1426449067.3643.nek5000-users at lists.mcs.anl.gov>
Content-Type: text/plain; charset=windows-1252; format=flowed

Hi,
indeed, VisIt even in the latest version does not read the 8-byte format
properly. The problem, in fact, is mainly related to the computations of
the limits (at least in 2D), and by just setting these manually (in
Controls/View) it can be corrected. The data appears to be read in
without problem.

Jing has analysed the source code of the Nek reader, and fixed the
corresponding parts; he has already sent it further to the VisIt
developers, and hopefully the next version will read 8-byte files as well.

Regarding the restart with 4-byte files, I guess the answer is that it
depends on the case and the requirements on accuracy you have. In my
opinion, for stability calculations you will not only need 8-byte files,
but also the restart from 4 files (aka proper restart). Similar
observations we have made for high-Reynolds-number turbulence. On the
other hand, for low-Re cases I guess there is not much of a problem.

Best regards,
Philipp


On 2015-03-15 20:16, nek5000-users at lists.mcs.anl.gov wrote:
> Dear Neks,
>
>
> Recently I've been playing with VisIt and it seems there is still
> problem reading nek5000 output data in 8-byte format. VisIt reads 4-byte
> output data successfully but not 8-byte. Is it essential to output data
> in 4-byte format if I want to use VisIt (ParaView actually can handle
> both data format well)?
>
>
> Also, in terms of continuing simulations, would 4-byte precision affect
> the restarting condition?
>
>
> Hope anyone can help. Thank you very much in advance.
>
>
> Kind regards,
>
> Tony
>
>
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>


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End of Nek5000-users Digest, Vol 73, Issue 10
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