yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Would not just be simply an initial velocity you assign, which might 
> change once your body hits another one, isn't it?
In that case, you just assign an initial velocity (body.vel=.., no 
engine, no blocked DOF). This is not what I call a 
"prescribed-something" body, just the usual dynamic body with some 
initial conditions.
> We could ideally also define a coefficient of restitution, that would 
> be equal to one if no dissipation occurs during the impact. Why do you 
> think this is not understandable?
In my understanding, "restitution coefficient" results from 
Newton+contactLaw, not from artificialy controling the displacement or 
velocity.
>  
>
>     Also, kinetic energy of velocity/displacement controlled bodies
>     should not count in the total kinetic energy, only
>     prescribed-force bodies should.
>
> I cannot see why not..
I was not reffering to bodies with an initial velocity, but bodies which 
are not subjected to Newton's law. They had no kinetic energy to the 
system since they are not dynamic (motion not modified by mass).

>     Chiara, did you try the blockedDOF trick?
>
> I try. I let you know.
Well, perhaps it was irrelevant. I still don't know what you are looking 
for...
For initial velocities at least, blockedDOFs are useless.

Ciao.

Bruno