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« on: October 25, 2022, 04:17:32 PM »
Dear Alex,
Thank you for your great question. In GrainGeo-Pile we use voxelized spheres for the piling process, which can lead to small resolution effects. More problems are introduced due to the boundary conditions. To achieve comparable results the computational domain needs to be rescaled e.g. larger spheres, domain larger. Otherwise, the global packing density decreases. To generate realistic packing densities without boundary effects the top and bottom area of the structure needs to be cropped. The images below show a set of spheres, which have been piled with GrainGeo and analyzed using MatDict. The plot of the solid volume fraction highlights the influence of the top and bottom boundary effect, which can be avoided if the structure is cropped at those locations.
Regarding the definition of the stable minimum in GrainGeo-Pile we only take geometric factors into account.
We hope this helps you get the most out of GrainGeo simulations in your future work.