yade-users team mailing list archive

[Anton Gladky <gladky.anton@xxxxxxxxx>]

Hi, Luc!

Thanks for answer, but could you not answer to
question136034@xxxxxxxxxxxxxxxxxxxxx address?
In this case it will appear here: question136034@xxxxxxxxxxxxxxxxxxxxx

Thank you
Anton



On Tue, Nov 30, 2010 at 11:56 AM, Luc Sibille <luc.sibille@xxxxxxxxxxxxxx>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
>
>
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