Hi, Luc! Thanks for answer, but could you not answer to [email protected] address? In this case it will appear here: [email protected]
Thank you Anton On Tue, Nov 30, 2010 at 11:56 AM, Luc Sibille <[email protected]>wrote: > Hi Chiara, > > In a general way, I think that one of the best answers is to read to PhD > Thesis of Bruno where he checked in which conditions we can assume that the > solution given by the DEM (which is a dynamic solution) for triaxial > compressions is not very far from a static solution. However his thesis is > written in French ;-) > Roughly speaking, the idea is to show that for sufficiently small loading > velocities (but not too small otherwise the simulation takes to much time), > the solution given by the DEM is lowly influenced by the loading velocity. > The "lowly" is fixed by what you think to be sufficiently accurate for the > problem you study. > Then for practical and repetitive simulations you can check the unbalance > force and verify that it corresponds to the unbalance force obtained during > the parametric study to find the "sufficiently low loading velocity". > Maybe Bruno will tell you that you can directly reason from the unbalance > force? > > A slightly different approach, but consisting also to estimate the > importance of the inertial terms through the dimensionless strain rate I can > be found in: > > @ARTICLE{dacruz05, > author={da Cruz, F. and Emam, S. and Prochnow, M. and Roux, J.N. and > Chevoir, F.}, > title={Rheophysics of dense granular materials{:} discrete simulation of > plane shear flows}, > journal={Physical Review E}, > volume={72}, > number={2}, > pages = "021309", > year={2005}, > note={}, > } > > Regards, Luc > > Chiara Modenese a écrit : > > New question #136034 on Yade: >> https://answers.launchpad.net/yade/+question/136034 >> >> Hello, >> >> I would like to address you a question about static-equilibrium in dem >> simulations, with particular reference to PeriTriaxController engine. In the >> latter, how do we make sure that the static-equilibrium condition is >> maintained during the triaxial phase, for instance? Looking at the code, I >> see that the unbalanced force is checked only when the system has reached >> the prescribed goal condition. What is the best criterion to establish if >> the system is under quasi-static conditions? Is the unbalanced force the >> only solution? >> >> Thank you for your opinion. >> cheers, Chiara >> >> > -- > Luc Sibille > > Université de Nantes - Laboratoire GeM UMR CNRS > > IUT de Saint Nazaire > 58, rue Michel-Ange - BP 420 > 44606 Saint-Nazaire Cedex, France > > Tel: +33 (0)2 40 17 81 78 > > > _______________________________________________ > 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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