yade-users team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

On 22 March 2010 16:39, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

>
>  BTW if someone is willing to write down how is the incremental form
>> derived (i.e. the geometrical reasoning behind it), on a piece of paper
>> and scan in, I will add it to sphinx documentation of respective classes
>> in a proper form. It is a shame that such fundamental algorithm is not
>> properly documented.
>>
>>
> I could do that. What is to be explained according to you?
> Only two things come to mind :
>
> 1) Small rotations can be approximated by cross-products, like in continuum
> mechanics in small strain. This is not related with the incremental
> formulation actually. Cross products could be replaced by quaternions
> without any change in the incremental part.
>
> 2) The explanation of the incremental part fit in : "if f_s=ks*u_s, then
> df_s = ks*du_s".
>
> Bruno
>
>  Not that the other ones are much better: NewtonIntegrator etc etc will
>> need this at one point as well.
>>
>>
>>
> True, but it would be a bit a waste of time to type everything as if there
> were no books explaining all that already.
> The best book I know is actually PFC "theoretical background" chapter, too
> bad it is not public. :(
>

Actually I have downloaded the demonstratio version of PFC3d from the
website and it comes with the complete manual (of course the version is
limited).



>
> Anybody knows an alternate reference summarizing the classical algorithms
> of DEM?
>
> Bruno
>
>
>
>
>
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