How many particles are in a cell?

sharonyue · October 21, 2021, 03:27

Hello there,

I know that p.cell() tells you that which cell this particle belongs to. On the contrary, I want to know the particles' label if they belong to a same cell. I tried some ways but they are cumbersome. Is there any simple way to achieve this?

Thanks.

In the following it is an example, we have 5 particles labeling 1,2,3,4,5.
particle 1 belongs to cell 23
particle 2 belongs to cell 20
particle 3 belongs to cell 23
particle 4 belongs to cell 21
particle 5 belongs to cell 23
therefore, cell 23 has particle 1 3 5. How can we extract the labels "1" "3" "5"?

guin · October 21, 2021, 05:40

You seem to be actually looking for what cellOccupancy() does

https://cpp.openfoam.org/v7/classFoa...bcb51500c11841

I am not sure if it will give you with the appropriate output format out of the box, but you can try it out.

jairoandres · December 26, 2021, 14:01

Now that you ask that, I wonder how could you determine the number of particles inside a specific cell. For example for celli, I want to determine the number of particles inside (or previously tracked into it). Is that information stored for each cell? or the information is stored for the particles with the cell number containing it?

October 21, 2021, 03:27	How many particles are in a cell?	#1
sharonyue Senior Member Dongyue Li Join Date: Jun 2012 Location: Beijing, China Posts: 838 Rep Power: 17	Hello there, I know that p.cell() tells you that which cell this particle belongs to. On the contrary, I want to know the particles' label if they belong to a same cell. I tried some ways but they are cumbersome. Is there any simple way to achieve this? Thanks. In the following it is an example, we have 5 particles labeling 1,2,3,4,5. particle 1 belongs to cell 23 particle 2 belongs to cell 20 particle 3 belongs to cell 23 particle 4 belongs to cell 21 particle 5 belongs to cell 23 therefore, cell 23 has particle 1 3 5. How can we extract the labels "1" "3" "5"? __________________ My OpenFOAM algorithm website: http://dyfluid.com By far the largest Chinese CFD-based forum: http://www.cfd-china.com/category/6/openfoam We provide lots of clusters to Chinese customers, and we are considering to do business overseas: http://dyfluid.com/DMCmodel.html

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October 21, 2021, 05:40		#2
guin Member Rodrigo Join Date: Mar 2010 Posts: 98 Rep Power: 16	You seem to be actually looking for what cellOccupancy() does https://cpp.openfoam.org/v7/classFoa...bcb51500c11841 I am not sure if it will give you with the appropriate output format out of the box, but you can try it out.

December 26, 2021, 14:01		#3
jairoandres Member Jairo A. Gutiérrez S Join Date: Nov 2014 Posts: 57 Rep Power: 11	Now that you ask that, I wonder how could you determine the number of particles inside a specific cell. For example for celli, I want to determine the number of particles inside (or previously tracked into it). Is that information stored for each cell? or the information is stored for the particles with the cell number containing it?