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[Chareyre <question178830@xxxxxxxxxxxxxxxxxxxxx>]

Question #178830 on Yade changed:
https://answers.launchpad.net/yade/+question/178830

Chareyre posted a new comment:
Chrsitian (not Jakob, sorry)

> Is there a command like O.interactions.recreate() ?

After Vaclav's comment, it is not needed.
I agree that you don't mind loosing contact history if you only want to generate an initial geometry. In that case scaling the whole packing after the densification procedure applies, and it is much simpler. But since it is possible to simultaneously fix porosity, PSD, and keep contact history by combining makeCloud and triax engine, why not do it?

>"If one knows f in ThreeDTriaxialEngine, then the particles could be
>generated smaller before blowing them up. In this case it seems, that
>my script makes the same ..."

Absolutely, modulo the problems discussed above. :)

>Can I use this engine without modeling any triaxial tests (as
preparation step for my model)?

Yes sure. It is a boundary conditions controller, and triaxial test is only one specific boundary condition. Have a look at the triax tutorial, if you uncomment only the the first section of the script ("applying confining pressure"), it will do just that.
If something is not clear, let me know, I'm sure it can be improved.

The only thing the script does not do is targetting one specific final
size of particles, because with frictional contacts no one cares: the
stress-strain behaviour will be the same. In order to target some final
sizes, it would need only a few additional lines for smartly tuning
initial porosity and particles size.

Last thing: facet boxes have known bugs, aabbWalls is used in the
tutorial and I recommend that one until we fix the facets bugs.

Vaclav, thank you for instructing comment. I learned something. :)

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