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[Jan Stránský <question233232@xxxxxxxxxxxxxxxxxxxxx>]

Question #233232 on Yade changed:
https://answers.launchpad.net/yade/+question/233232

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

the very basic idea of DEM is that forces between particles are computed
according to their overlap, i.e. when they are touching. So an idea for
your case:
- particles, that do not touch initially is not a problem
- use aabbEnlargeFactor>1 of Bo1 functor and interactionDetectionFactor>1
of Ig2 functor (the same value for both cases, see [1]) to detect and
create interactions even if particles are not in contact. Then the force is
applied on particles even if they do not touch and when they touch, the
force has certain value depending on you enlargeFactors value, particle
size, stiffness and contact law used.

I am not sure if this is what you are looking for, in this kind of
questions it is always good to explain also why you want to do such things
(some example what you want to simulate for example).
cheers
Jan

[1] https://yade-dem.org/doc/user.html#creating-interactions



2013/7/30 pingyang.1019@xxxxxxx <question233232@xxxxxxxxxxxxxxxxxxxxx>

> New question #233232 on Yade:
> https://answers.launchpad.net/yade/+question/233232
>
> Hello !
>     I  want to simulation Initially particles do not touch and then
>  particles touch when the force between the particles reaches a certain
> value. I do not know how to do it .
>
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