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[Bruno Chareyre <question254578@xxxxxxxxxxxxxxxxxxxxx>]

Question #254578 on Yade changed:
https://answers.launchpad.net/yade/+question/254578

Bruno Chareyre proposed the following answer:
Hello,
growParticle() or growParticles() with a multiplier less than 1 will do what you need [1].
It will update inertia optionally, which you maybe don't want if you have mass conservation.

@Jan, 
Your suggestion will not work. The interactions keep a copy of radii, thus decreasing the radius directly will have strictly no effect on an initialy stable packing. 

Bruno

[1] https://yade-dem.org/doc/yade.utils.html#yade._utils.growParticle

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