yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

Hello,

how would you compute the relative rotation between two particles only due
to rolling? I found this report where the code for the bending moment would
be describe in 3d (see attached file). Eq. 12 gives the incremental rolling,
is that what I should implement in Yade if I want the same behaviour?

Thanks for help.
Chiara



On 17 December 2010 15:40, Chiara Modenese <c.modenese@xxxxxxxxx> wrote:

> Ok! Thanks all for suggestions. I agree that for now it is simpler to code
> it in the Law functor. I will do and then test it with before commit. I let
> you know if issues arise. Anyway, I will probably not be able to commit it
> before Christmas -- in case someone else needed it (btw, Happy Christmas to
> everyone!).
>
> Cheers, Chiara
>
> On 17 December 2010 15:03, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>wrote:
>
>>
>> > You can write the incremental rotations in the Law2 functor first
>> > (just like the current rotation of ScGeom6D algorithm used to be in
>> > CohesiveFrictionalContactLaw) and use plain ScGeom,
>> Thats right.
>>
>> > later move to ScGeom6D. If you move it it in ScGeom6D, however, it
>> > will mean dragging all the quaternions in ScGeom6D uselessly.
>> Indeed, it will make 3 useless quaternions. Mmmh.. in fact it could be
>> moved to base ScGeom. relSpin would be dragged by pure 3D interactions
>> but it's only one vector.
>> In that case CFLaw could work with two different geometries (ScGeom for
>> incremental, ScGeom6D for total).
>> Let's see it work first, then we can think about design.
>>
>> Cheers.
>>
>> Bruno
>>
>> > If you are inclined towards experimentation, you could have a look at
>> > L6Geom.
>> >
>> > HTH, v
>> >
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>>
>>
>> --
>> _______________
>> Bruno Chareyre
>> Associate Professor
>> ENSE³ - Grenoble INP
>> Lab. 3SR
>> BP 53 - 38041, Grenoble cedex 9 - France
>> Tél : +33 4 56 52 86 21
>> Fax : +33 4 76 82 70 43
>> ________________
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>

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