Grain size distribution

[nitheeshkumar11]

Greetings,
I want to generate a microstructure with grain size distribution of 49+-12 micrometers in a 2mm cubic domain. How do I do that?

Thanks in advance.

[rquey]

You would typically specify a lognormal grain size distribution of average 0.049 and standard deviation of your choice. It is also a good idea to specify a sphericity distribution:

neper -T -n from_morpho -morpho "diameq:lognormal(0.049,0.015),1-sphericity:lognormal(0.145,0.03)" -domain "cube(0.2,0.2,0.2)"

To exclude values smaller than 49 - 12 and larger than 49 + 12 micrometers, add from and to:

neper -T -n from_morpho -morpho "diameq:lognormal(0.049,0.015,from=0.037,to=0.061),1-sphericity:lognormal(0.145,0.03)" -domain "cube(0.2,0.2,0.2)"
neper -V test.tess -print img

Note that I used a domain of size 0.2 (mm), since 2 mm leads to 100,000+ cells.