Hi Asim,

I am just resending this email to the whole nektar-users list in case others have experienced this issue. 

Thanks for your summary. This is certainly strange. It looks like some noise is being added in your p=100 case however I have not seen this previously. 

I am cc’ing Dave & Douglas to see if they have experienced this at all? 

Cheers,
Spencer.


On 25 Nov 2016, at 06:07, Asım Önder <asim.onder@gmail.com> wrote:

Hi Spencer,

thanks for the command. I was able to merge partitions with it, and convert to VTU. However, some problems show up for highly partitioned cases.

I attached an example for two cases merged from p=2, and p=100 (p number of partitions). The contours are the mean spanwise vorticity, extracted with the slightly extended meanmode-module that I wrote. In the case of p=100, there are clear oscillations in some areas. 

I didn't observe any oscillations for velocity and pressure fields in any cases. So, I guess calculation of derivatives giving problems in highly-partitioned case. I was wondering what could be the reason for this. 

Thank you very much in advance for any feedback.

Best,
Asim

On Mon, Nov 21, 2016 at 7:29 AM, Sherwin, Spencer J <s.sherwin@imperial.ac.uk>wrote:
HI Asim,

If you put all the files into a directory called meanField.chk/ 

The only thing you then need in this directory is a file called info.xml which tell you which partitions contain which elements. This can be generated from FieldConvert using

<page98image37800.png> 
FieldConvert --nprocs 10 file2.xml file2.fld/Info.xml:info

There should also be some details about this in the user-guide in section 5.5.1 (user-guide-4.3.2.pdf). 

I hope this helps.

Spencer.

On 16 Nov 2016, at 09:26, Asım Önder <asim.onder@gmail.com> wrote:

Dear all,

Due to memory limitations, often I have to partition large data files using something like

FieldConvert --part-only=100 config.xml fields/field_1.chk

, and postprocess them piece by piece:
 
FieldConvert -v -m meanstats config_xml/P000000"$p".xml fields/field_1.chk meanFields/meanField_1_p"$p".fld

In the case of meanmode module for example, the output is a collection of many small files associated with partitions, which can be analyzed piece by piece.  I was wondering if there is a way to merge the outputs back into one piece again like one piece fld file. 

Any feedback is appreciated. 

Thanks,
Asim
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Spencer  Sherwin
McLaren Racing/Royal Academy of Engineering Research Chair, 
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
Imperial College London
South Kensington Campus
London SW7 2AZ

+44 (0) 20 759 45052




-- 
Asim
<mean_spanwise_vorticity.png>

Spencer  Sherwin
McLaren Racing/Royal Academy of Engineering Research Chair, 
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
Imperial College London
South Kensington Campus
London SW7 2AZ

+44 (0) 20 759 45052