A hard one: how to get spanwise average in Fluent?

ivanbuz · November 5, 2009, 17:17

The computation domain is constructed by simply repeating structured 2D mesh in z-direction (spanwise), and I want to get the spanwise-averaged field variables. I tried but still could not find the way. I have thought of several methods as following:

1. Use UDF. The UDF will need to get the neighboring cell in z-direction. I don't know how.
2. Export data file from Fluent and do the average in Matlab. But the exported file is in PEBLOCK format, and there is a lot of connectivity information in the file, and I also don't quite understand the organization of data in that file.
3. Read the exported file or read Fluent case and data files directly into Tecplot and do the average. I checked and could not find the way to get spanwise average in Tecplot.
4. After reading files into Tecplot as in 3, export a file with better format (like IJK-ordered) from Tecplot, but I can only export files in FEPOINT or PEBLOCK format.

Anybody any suggestion? Thanks!

arslantuf · February 16, 2011, 09:54

Hello Ivanbuz
I have been suffering about same problem. Do you have a solution so far?

thank you

Amir · February 17, 2011, 03:44

Hi,
I've done it by using tecplot as an interface media, here's the instruction:
- first by a journal file export number of planes data in span direction for tecplot.
- write data exported in tecplot as new files.
- export new files to matlab and compute the average.

November 5, 2009, 17:17	A hard one: how to get spanwise average in Fluent?	#1
ivanbuz Member Ivan Join Date: May 2009 Posts: 85 Rep Power: 17	The computation domain is constructed by simply repeating structured 2D mesh in z-direction (spanwise), and I want to get the spanwise-averaged field variables. I tried but still could not find the way. I have thought of several methods as following: 1. Use UDF. The UDF will need to get the neighboring cell in z-direction. I don't know how. 2. Export data file from Fluent and do the average in Matlab. But the exported file is in PEBLOCK format, and there is a lot of connectivity information in the file, and I also don't quite understand the organization of data in that file. 3. Read the exported file or read Fluent case and data files directly into Tecplot and do the average. I checked and could not find the way to get spanwise average in Tecplot. 4. After reading files into Tecplot as in 3, export a file with better format (like IJK-ordered) from Tecplot, but I can only export files in FEPOINT or PEBLOCK format. Anybody any suggestion? Thanks!

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February 16, 2011, 09:54		#2
arslantuf New Member zakk Join Date: Jun 2009 Posts: 10 Rep Power: 17	Hello Ivanbuz I have been suffering about same problem. Do you have a solution so far? thank you

February 17, 2011, 03:44		#3
Amir Senior Member Amir Join Date: May 2009 Location: Montreal, QC Posts: 735 Blog Entries: 1 Rep Power: 23	Hi, I've done it by using tecplot as an interface media, here's the instruction: - first by a journal file export number of planes data in span direction for tecplot. - write data exported in tecplot as new files. - export new files to matlab and compute the average.