yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

Ok, then I would have a new question for you. I was thinking to apply
Vincent's suggestion to plot fabric tensor considered as the sum of two
contributions (which is already in code), one due to negative forces and the
other to positive ones. The distinction could be made if one uses cohesive
contacts, for instance. Say that you also include viscous damping, then you
will not be able to distinguish between the contribution only due to
cohesion since also damping, in fact, could change the sign of the forces.
Vincent, do you have any other hint in this regard? Or maybe I could store
the viscous and the spring force into two distinct vectors and play with
that?

Thanks. Chiara


On 1 March 2011 09:49, Chiara Modenese <c.modenese@xxxxxxxxx> wrote:

> Ok, I think I know why now. I mean, since I have viscous forces stored into
> normalForce that could be the cause.
> Cheers. Chiara
>
>
> On 28 February 2011 21:02, Chiara Modenese <c.modenese@xxxxxxxxx> wrote:
>
>> Hi Guys,
>>
>> small question. I was trying to plot normal force versus overlapping of
>> all my interactions. For the normal force I want to keep the sign and so I
>> simply project it onto the corresponding normal vector something like:
>> Fn=i.phys.normalForce.dot(i.geom.normal). The problem is that, without
>> adhesion and according to a certain convention, I expect forces all of the
>> same sign whereas I sometimes record opposite ones. A problem in my script
>> or why does that happen?
>>
>> Thanks, Chiara
>>
>
>