Calculate HRR Volume integral

cheetthe1 · October 29, 2018, 20:13

Hi,

I want star ccm+ to calculate the sum (=volume integral) of my individual heat release rates. The individual rates seem to depend on the cell volume. I have different grid spacings in there, it is partially refined. Anyone have an idea how to calculate that? My model is steady so I could make star compute one step after defining the required function.

Thank you
Greets Bernie

me3840 · October 29, 2018, 22:53

I don't know what a heat release rate is, but volume integral reports exist, can you use one of those?

cheetthe1 · October 29, 2018, 23:04

Thats what Im trying to learn about. Every cell has a single scalar value and i need the sum of it. There is positive and negative values contributing to it. And I am not sure if they should be weighted according to their cell volume. The unit of HRR is Watt.

Edit: i thought about it and it makes sense, a bigger cell gives a higher contribution in terms of watt and that is what i can see. So all i really need is the sum in my volume of different cell kinds. If someone could explain the procedure a little that would be great. Im new to postprocessing in star

Greets Bernie

me3840 · October 30, 2018, 00:18

Like I said, look up the volume integral report.

acalado · November 7, 2018, 14:47

Correct, volume integral should give you what you are looking for (i.e. the result will be in Watts assuming you are integrating W/m3)

cheetthe1 · November 7, 2018, 16:18

It did. Thank you!

October 29, 2018, 20:13	Calculate HRR Volume integral	#1
cheetthe1 Member Bernhard Stiehl Join Date: Oct 2018 Posts: 30 Rep Power: 7	Hi, I want star ccm+ to calculate the sum (=volume integral) of my individual heat release rates. The individual rates seem to depend on the cell volume. I have different grid spacings in there, it is partially refined. Anyone have an idea how to calculate that? My model is steady so I could make star compute one step after defining the required function. Thank you Greets Bernie

October 29, 2018, 23:04		#3
cheetthe1 Member Bernhard Stiehl Join Date: Oct 2018 Posts: 30 Rep Power: 7	Thats what Im trying to learn about. Every cell has a single scalar value and i need the sum of it. There is positive and negative values contributing to it. And I am not sure if they should be weighted according to their cell volume. The unit of HRR is Watt. Edit: i thought about it and it makes sense, a bigger cell gives a higher contribution in terms of watt and that is what i can see. So all i really need is the sum in my volume of different cell kinds. If someone could explain the procedure a little that would be great. Im new to postprocessing in star Greets Bernie Last edited by cheetthe1; October 30, 2018 at 00:10.

November 7, 2018, 14:47		#5
acalado Senior Member André Join Date: Mar 2016 Posts: 133 Rep Power: 10	Correct, volume integral should give you what you are looking for (i.e. the result will be in Watts assuming you are integrating W/m3) __________________ Sapere aude!

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October 29, 2018, 22:53		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	I don't know what a heat release rate is, but volume integral reports exist, can you use one of those?

October 30, 2018, 00:18		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	Like I said, look up the volume integral report.

November 7, 2018, 16:18		#6
cheetthe1 Member Bernhard Stiehl Join Date: Oct 2018 Posts: 30 Rep Power: 7	It did. Thank you!