Have a look at this reference and see if it helps, we just assume a C and back calculated to another property of a well known material. I hope it helps.

J. D. Bernal and J. Mason. "Co-ordination of Randomly Packed Spheres." Nature, 188 (1960) 910

Behzad Soltanbeigi ,

From the figure you can see that Clumps 22901 is not exactly clumps. Those are actually pebbles. I can see them clearly mentioned in FISH script in the command line. I assumed total number of contacts between pebble-pebble. So when I use 2C/N to calculate coordination number (i.e., 2*37748/22901 = 3.29), I am getting less than 4. Usually in 3D, the CN will be greater than 4 for structurally stable assembly. But my values are always below 4. Would you please let me know is there any other way to calculate this CN?

Thank you.

Dear Shiva Prashanth Kumar , the value of 22901 indicated in the plot is not the number of clumps (particles), but indeed the total number of pebbles in the model. Thus, if you have the same number of pebbles per clump, you can simply divide the 22901 by the number of pebbles per clump to get the number of clumps (particles) in the system. Alternatively, you can make use of a fish function like the one attached. It calculates the coordination number, but also the maximum contact overlap, expressed as a percentage of the particle diameter (which is taken as the volume equivalent diameter of a sphere). The coordination number is given by variable "CN", and the overlap by "MaxOverlap". Hope this helps.

Dear C.J. Coetzee,

Thank you so much for doing needful. Its working.

Cheers

Shiva