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[Luc Scholtès <question194761@xxxxxxxxxxxxxxxxxxxxx>]

Question #194761 on Yade changed:
https://answers.launchpad.net/yade/+question/194761

Luc Scholtès proposed the following answer:
Hi,

First, you should know that size does not matter in YADE, or, at least,
should not. Indeed, interaction laws (at least, the basic ones like
Law2_ScGeom_FrictPhys_CundallStrack or CohesiveFrictionalContactLaw for
example) have been implemented so that they are size independent. You
can try to run several triaxial tests with same parameters and loading
conditions on samples with different sizes length to verify (be careful
nonetheless to have "enough" particles in your samples, between 5000 and
10000 is OK from my own experience). So, YES, people usually use bigger
particles than real ones in order to speed up simulations, and NO, there
should not be any influence on the results.

Concerning now particle size distribution, I am not a specialist but it
will certainly have an impact on you results, like for real granular
materials. Things exist in YADE to manage particle size distribution. As
you pointed out, an extended size distribution tends to penalize
simulation time.

Concerning now your last point about grain shape and roughness. Of
course they influence the behaviour. You cannot, for example, reproduce
real sand's internal friction angle with spherical particles as sand
grains are not spherical in nature. That's one of the reason why some
people use clumps or rolling moment law for example (polyhedral
particles are not yet implemented in YADE).

Please have a look here for more information if not already done: https
://yade-dem.org/doc/index-toctree.html

Cheers

  Luc

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