yade-users team mailing list archive
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Re: General questions
For me ("advantage" depends on your goals), the main advantage was to
get a constant ratio between local stiffness parameters and stiffness of
the packing. Changing particles sizes will not affect this ratio. If you
like non-dimensional problems, you should like this.
Another advantage is, the Y. modulus of the dense packing will be of the
same order of magnitude as the modulus you give in the beginnng. You
have an a-priori estimate.
For Poisson, the name is only due to the fact that Poisson's ratio
depends mostly on ks/kn. But there is no constant - not even linear -
relation between the micro and the macro in that case.
1) So, why in Yade did you choose to specify the Young’s modulus and the Poisson’s ratio? Actually I see that in this way we obtain different contact stiffnesses for each particle, but which is the advantage? Just to know..
It is already the case, I don't remember the exact way, but check in gui
2) Concerning the display of the force network between bodies.. Has anybody implemented the possibility to display also the intensity of the force network, I mean different thicknesses according to the amount of the contact forces? Probably someone else have already asked this question but I don’t remember whether he received or not any answer..
3) Again according to the display of the force network, is this visualization referred to the real contacts, is not it? Are also the virtual contacts somehow visualized?
I don't know.
Last bzr snapshot is probably the best option. It will be totaly stable
as long as you don't update it. ;)
The best is to try and update frequently however, always keep backups of
working code before any update. In the worst case (i.e. you realize
after a few weeks that you spent more time solving conflicts, filling
bug reports, or negotiating changes in somebody else's code, than
actually writing your law), you can always resume working offline.
4) I have to start to implement my own engine for a new contact law.. Which release of Yade do you suggest me to start with? Putting it better, I know that the implementation of Yade is a work in progress, but for example I see you have recently changed the names of many variables.. For me it is not so simple to follow every release and if I need to add something I suppose I have to start with a specific one. I know this fact depends on the purpose I have, but is there a quite “stable” version of Yade according to the last changes?
Don't hesitate to explain here what you want to do, to avoid doing the
same thing twice. There is an example to help people writing new law
somewhere IIRC. Vaclav will help better than me on this part (I'm still
using "deprecated" contact laws on my side...).
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