# how to calculate Tmean over the entrance length in a pipe?

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 April 23, 2016, 20:15 how to calculate Tmean over the entrance length in a pipe? #1 New Member   Join Date: Apr 2016 Posts: 1 Rep Power: 0 Hey, I want to calculate Tmean over the entrance length in a pipe, in fluent. I guess UDF is the only way to do it. Is there some PDF or material, which can help me understand how to make UDF for mean temp

April 24, 2016, 17:17
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Quote:
 Originally Posted by sharmann2 Hey, I want to calculate Tmean over the entrance length in a pipe, in fluent. I guess UDF is the only way to do it. Is there some PDF or material, which can help me understand how to make UDF for mean temp
You can go to report > surface integral and integrate the temperature at the surface you want.

 April 24, 2016, 23:52 #3 Senior Member   François Grégoire Join Date: Jan 2010 Location: Laval University, Canada Posts: 389 Rep Power: 10 Example 1 shows how you can integrate a variable: https://www.sharcnet.ca/Software/Flu...udf/node20.htm The simplest way would be to create a fluid zone in the mesh that corresponds to the entrance length of the pipe, then you just have to loop over this zone.

June 25, 2016, 01:52
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Williams
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Quote:
 Originally Posted by macfly Example 1 shows how you can integrate a variable: https://www.sharcnet.ca/Software/Flu...udf/node20.htm The simplest way would be to create a fluid zone in the mesh that corresponds to the entrance length of the pipe, then you just have to loop over this zone.
Dear macfly!
Why we can't surface integral and integrate the temperature at the surface we want as Bruno Machado said? why we must use the udf?Thank you very much!

 June 26, 2016, 10:20 #5 Senior Member   François Grégoire Join Date: Jan 2010 Location: Laval University, Canada Posts: 389 Rep Power: 10 Yes gearman, you can postprocess surface or volume integrals as Bruno explained, but you got to use UDFs if you want to calculate and use integrals during solving.

June 27, 2016, 06:19
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Williams
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Quote:
 Originally Posted by macfly Yes gearman, you can postprocess surface or volume integrals as Bruno explained, but you got to use UDFs if you want to calculate and use integrals during solving.
Thank you very much!

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