I think that Giuseppe may have a point. One problem with shearing the
periodic cell by rotating it is that you can reach very large
deformations but at some point (I suppose) you have to stop shearing it
(because, say, you reach a rotation of 90 degrees of the vertical
boundaries). Now, one alternative could be:
1) to maintain a full 3d periodic boundary condition
2) to adjust the top boundary if under stress-controlled conditions
3) to prescribe a simple shear by applying the velocity gradient but
without affecting the vertical boundaries (so only particles would be
influenced by that but the lateral boundaries would stay vertical).
In principle this would allow for a continuous shear flow. Bruno, do you
think it would work? It is more question if that makes sense other than
how actually doing it.
Chiara
On 01/02/2012 17:41, Chareyre wrote:
Question #186515 on Yade changed:
https://answers.launchpad.net/yade/+question/186515
Status: Open => Answered
Chareyre proposed the following answer:
Hi Giuseppe,
First, make sure you read https://www.yade-dem.org/doc/formulation.html
#deformations-handling carefuly. You will see that you are not supposed
to change cell.trsf (and that is why you can't change it).
Second, I don't understand what "prevent shear" means. Or more
precisely, I don't understand why your simulation results in a shear if
you don't prescribe one yourself (well, if you run a simple shear test
you have to prescribe a shear I guess, but then why would you prevent
while imposing?... I'm lost).
Bruno
_______________________________________________
Mailing list: https://launchpad.net/~yade-users
Post to : yade-users@lists.launchpad.net
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp