On 24 May 2010 14:32, Bruno Chareyre <[email protected]> wrote:
> Based on my test, ScGeom doesn't work in PB. It is (I think) because it > needs relative velocity, which is not defined correctly across periods. > I have a few ideas to solve that though, and some uncommited code (see > **)... > It is a pitty that we can't use the same law in periodic and finite BCs at > the moment. On one hand, there is no sphere-box, hence no TriaxialTest, with > Dem3DOF (facets and planes for boundaries is bugged for some reasons). On > the other hand, ScGeom can't be used in periodic BCs. Oh, so it is not working. Can we do something in this regard? I would really need to use PBC and if it is not working properly with ScGeom I will have to change my contact laws (one is HM and another one is not yet ready as I still am working on it). Would you have any suggestions how to fix it? Could you say more? > > 1) Are you following Cundall's algorithm? >> > I don't know Cundall's papers on this. Any reference? Cundall was the first one to introduce the periodic boundary in a TT simulation, the paper in question is: Cundall PA, "Computer simulations of dense sphere assemblies", Micromechanics of Granular Materials, Elsevier, 1988, pp. 113-123. Also Thornton was using the same algorithm for shear triaxial tests, this is another interesting paper on PB: Thornton, Antony, "Quasi-static shear deformation of a soft particle system", Powder Technology, 2009, pp. 179-191. Anyway Thornton is using the same algorithm as Cundall (his own code is derived from TRUBALL). Chiara > Bruno > > > _______________________________________________ > Mailing list: > https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> > Post to : [email protected] > Unsubscribe : > https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> > More help : https://help.launchpad.net/ListHelp >
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