Adding imaginary patch for calculation of average values

bboonacker · February 17, 2009, 08:58

Hello OF'ers,

I am simulating pipe flows and I have a question concerning the calculation of average velocities and pressures.
Is it possible to add something like an additional, imaginary, patch at a specified point in order to calculate the averages ?

I know it is possible within Paraview, but I am looking for something like patchAverage, although I do not want to use the Inlet or Outlet patch.

Thanks in advance,

Bart

antonio_ing · February 17, 2009, 10:20

hi Bart

have a look in another post regarding "pressure coefficients" in "Running / Solving / CFD". There someone suggested me to use probe points that save for each time you will store the value of velocity or pressure or whatever you want.

hope this helps

antonio

santos · February 17, 2009, 10:30

Hi Bart,

Have a look at the sample utility, that lies in $FOAM_UTILITIES/postProcessing/sampling/sample.

In that path you have a sampleDict dictionary, that I believe is self-explanatory.

Just place that dictionary in the system directory of your case, and make the necessary adjustments to get the values belonging to the plane your are interested in.

Regards,
Jose Santos

bboonacker · February 20, 2009, 06:13

Hello Jose,

Thanks for the tip, it works perfectly.
Now I only have to average the pressure on each surface and then I'm done

Bart

Subodh · June 2, 2009, 00:00

Hi Bart,

Did you able to calculate average from sampled data for planes. Though my patch is not a plane but i have sampled data, and I want to calculate average value from it. Can you help me out ??

Thanks in advance
Subodh

February 17, 2009, 08:58	Hello OF'ers, I am simulati	#1
bboonacker New Member Bart Boonacker Join Date: Mar 2009 Posts: 7 Rep Power: 17	Hello OF'ers, I am simulating pipe flows and I have a question concerning the calculation of average velocities and pressures. Is it possible to add something like an additional, imaginary, patch at a specified point in order to calculate the averages ? I know it is possible within Paraview, but I am looking for something like patchAverage, although I do not want to use the Inlet or Outlet patch. Thanks in advance, Bart

February 17, 2009, 10:20	hi Bart have a look in anot	#2
antonio_ing Member antonio segalini Join Date: Mar 2009 Posts: 75 Rep Power: 17	hi Bart have a look in another post regarding "pressure coefficients" in "Running / Solving / CFD". There someone suggested me to use probe points that save for each time you will store the value of velocity or pressure or whatever you want. hope this helps antonio

February 17, 2009, 10:30	Hi Bart, Have a look at the	#3
santos Senior Member Jose Luis Santos Join Date: Mar 2009 Location: Portugal Posts: 215 Rep Power: 18	Hi Bart, Have a look at the sample utility, that lies in $FOAM_UTILITIES/postProcessing/sampling/sample. In that path you have a sampleDict dictionary, that I believe is self-explanatory. Just place that dictionary in the system directory of your case, and make the necessary adjustments to get the values belonging to the plane your are interested in. Regards, Jose Santos

February 20, 2009, 06:13	Hello Jose, Thanks for the	#4
bboonacker New Member Bart Boonacker Join Date: Mar 2009 Posts: 7 Rep Power: 17	Hello Jose, Thanks for the tip, it works perfectly. Now I only have to average the pressure on each surface and then I'm done Bart

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June 2, 2009, 00:00		#5
Subodh New Member Subodh Kumar Join Date: Apr 2009 Location: India Posts: 9 Rep Power: 17	Hi Bart, Did you able to calculate average from sampled data for planes. Though my patch is not a plane but i have sampled data, and I want to calculate average value from it. Can you help me out ?? Thanks in advance Subodh