Question #689293 on Yade changed:
https://answers.launchpad.net/yade/+question/689293

    Status: Open => Answered

Robert Caulk proposed the following answer:
The infinite K1 warning is just that, a warning.

If you have a regular packing like I assume you do here, the voronoi
centers of cells may end up directly on top of one another, which is not
a problem for triangulation, but is a problem for estimating
permeability inversely proportional to distance between voronoi
centers...thus the warning. Yade puts an arbitrarily high permeability
between those cells.

The best reference is [1][2].

[1]Chareyre, B., Cortis, A., Catalano, E., & Barthélemy, E. (2012).
Pore-Scale Modeling of Viscous Flow and Induced Forces in Dense Sphere
Packings. Transport in Porous Media, 94(2), 595–615.
https://doi.org/10.1007/s11242-012-0057-2

[2Catalano, E., Chareyre, B., & Barthelemy, E. (2014). Pore-scale
modeling of fluid-particles interaction and emerging poromechanical
effects. International Journal for Numerical and Analytical Methods in
Geomechanics, 38(1), 51–71. https://doi.org/10.1002/nag.2198

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