[General] Programmable filter to compute surface average

fede32 · December 16, 2018, 18:50

Hi, I have a surface with field values, which is an output of an openfoam postprocessing (I have made it using a cutting plane on my geometry). I need to calculate the average field value on the surface and I don't know how to do it.

I was trying to do it using the programmable filter, but I couldn't. I have found some examples on how to use the tool here https://www.paraview.org/Wiki/Python...ammable_Filter, but I still don't know how to get the cell areas, and how to promediate the integral. Can somebody provide me a useful script to compute an average field? Thanks!

ssa_cfd · December 17, 2018, 06:06

Load all your available time steps and then use temporal statistics filter. It will automatically calculate field averages.

fede32 · December 17, 2018, 08:59

Hi, thanks for your answer. I applied a temporal statisctics filter, and now I have the new fields: u_average, p_average, etc. But when I select each of them, the render only display a new field, Perhaps is it calculating average inside each cell?

Flowkersma · December 17, 2018, 18:38

Hi,

You should look at the integrate variables filter to calculate an average value of a cutting plane. To script this, have a look at this thread.

Best, Mikko

December 16, 2018, 18:50	Programmable filter to compute surface average	#1
fede32 Member Federico Agustín Caccia Join Date: Jun 2015 Location: Buenos Aires, Argentina Posts: 55 Rep Power: 11	Hi, I have a surface with field values, which is an output of an openfoam postprocessing (I have made it using a cutting plane on my geometry). I need to calculate the average field value on the surface and I don't know how to do it. I was trying to do it using the programmable filter, but I couldn't. I have found some examples on how to use the tool here https://www.paraview.org/Wiki/Python...ammable_Filter, but I still don't know how to get the cell areas, and how to promediate the integral. Can somebody provide me a useful script to compute an average field? Thanks!

December 17, 2018, 06:06		#2
ssa_cfd Member ssa Join Date: Sep 2018 Posts: 93 Rep Power: 8	Load all your available time steps and then use temporal statistics filter. It will automatically calculate field averages. fede32 likes this.

December 17, 2018, 18:38		#4
Flowkersma Senior Member Mikko Join Date: Jul 2014 Location: The Hague, The Netherlands Posts: 243 Rep Power: 13	Hi, You should look at the integrate variables filter to calculate an average value of a cutting plane. To script this, have a look at this thread. Best, Mikko fede32 likes this.

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December 17, 2018, 08:59		#3
fede32 Member Federico Agustín Caccia Join Date: Jun 2015 Location: Buenos Aires, Argentina Posts: 55 Rep Power: 11	Hi, thanks for your answer. I applied a temporal statisctics filter, and now I have the new fields: u_average, p_average, etc. But when I select each of them, the render only display a new field, Perhaps is it calculating average inside each cell?