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[Bruno Chareyre <question404135@xxxxxxxxxxxxxxxxxxxxx>]

Question #404135 on Yade changed:
https://answers.launchpad.net/yade/+question/404135

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hi,

> 1. Why is contact detection rely on mechanical behavior(In this case
different normalCohesion value affect interaction number)?

If cohesion is small the interactions are created then immediately broken for the tensile force exceeds the tensile strength.
Thus one possible trick is to set high cohesion to create the ints, then set the relevant interaction->adhesion  at the next step within a loop.
We could add one option to initialize the force-free distance as the initial distance, it would make this particular situation a bit simpler (I think it is done this way in another (CPM?) contact model). 

> 2. In my understanding, setCohesionNow() merely set a maximum tensile
strength between two particles(not a strength, but a maximum strength
value), but in this occasion, after setting cohesion, some "strength"
are generated between particles, why is that?

To me "strength" means "maximum force". Not sure what "maximum strength"
is. If you mean "some forces are generated", that is correct: the
distant interactions are initially in traction (regardless of the
strength except if it exceeds strength, in which case it is null).

> 1. How can I answer to a specific person(or “floor” like #1,#2, etc),
like Jan Stránský did in #3?

"Reply to" the question from an email client, without erasing the
replied-to (more a "lazy" than a "good" practice actually).

> 2. Would it be possible to invite a specific person

IIRC lanchpad lets you send 5 messages/day to other lauchpad accounts
(click on the launchpad name -> contact this user).

Bruno

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