Hi Janek, Welcome back.
Very briefly: We actually recently tackled "rock fracking" problems with Timos, Frederic and Bruno (just have a look at: http://www.sciencedirect.com/science/article/pii/S136516091730076X) by combining the JCFPM and the PFV scheme. Timos is still working on it but all the developments should be available in current YADE version. Timos should also provide a simple working script very soon (Timos, if you see this, please do it asap). For your problem of non initially stress free packing, I am not sure I understand correctly but you could have a look at the JCFPM where the equilibrium distance is initialized at the contact detection. Besides, the JCFPM enables to model materials with pre-existing discontinuities (e.g. fractured rock masses) as described in several papers (see for instance: http://www.sciencedirect.com/science/article/pii/S1365160912000391 and https://academic.oup.com/gji/article/191/2/467/640987/Strength-characterization-of-rock-masses-using-a ). Please do not hesitate if you want more details or explanations. Cheers Luc 2017-04-14 9:53 GMT+02:00 Bruno Chareyre <bruno.chare...@grenoble-inp.fr>: > Hi Janek, > In super-super short, welcome back!! :) > More later. > Bruno > > > On 04/13/2017 09:10 PM, Janek Kozicki wrote: > >> Hello everyone, >> >> I am going back to work on yade, and I have some interesting plans. >> This also entails one question :) >> >> Sorry for goofy subject, I hope it catches your attention. >> >> In super-short I will tell you my history: since I left Grenoble in >> 2009 I attended a full 5-year course in physics at University of >> Gdańsk and I defended in 2015 master thesis in quantum mechanics. >> I was quiet here on yade-dev, because apart from full-time studies >> I was also working as associate professor at Gdańsk University >> of Technology. In 2014 I defended my habilitation on civil >> engineering/numerical modelling. Next week I will obtain a professor >> position at GUT in civil engineering department. Since 2015 I needed >> nearly 2-years to complete my physics education by self studying and >> individual talks with other physics professors. This evolved into my >> plans to implement quantum mechanics into yade in an elegant and >> documented way. As currently it only works for me and is not >> documented. >> >> Currently I got involved in a funded research that treats shale gas >> extraction. So I am paid a little to implement rock fracking, and >> I decided that this is a good opportunity for me to get quickly up to >> speed with current yade development process & methods. Implementing >> rock fracking will make easier for me to work on quantum mechanics >> later, and easier for *you* to watch me. >> >> During years 2009-2017 all other people in my department were using >> some older version of yade. And they lost touch with latest yade >> releases. This was my fault, since due to my full-time 5-year studies >> of physics I did not have time to keep them updated about latest yade >> versions. I think that I stopped updating yade for them around year 2012. >> Most of the time they were calculating concrete, and despite my >> encouragement to contact this mailing list and commit their changes, >> they didn't want to do so. Perhaps I didn't push them hard enough. >> >> Currently I will update yade for them, since some of them will now >> also want to calculate rock fracking. This means that I need to merge >> some of their changes into latest yade trunk. But actually when >> looking closer at this I see that there is only one simple change, >> which perhaps is already implemented in yade, and we just don't know >> about it. So there would be no need to port it, just use the >> different name for this feature. >> >> >> Now, here comes the question: >> >> To calculate concrete the sample made of spheres has some of these >> spheres overlapping. Since it is difficult to generate a sample where >> none of the spheres overlap. And with some overlapping the spheres >> want to "explode" until there is no overlap, sometimes cohesion prevents >> this, but we start calculations with non-zero forces between spheres. >> To mitigate this problem, the initial overlap between spheres is >> stored (on first iteration) and is treated as "zero" penetration >> depth during tension & compression. >> >> So the question is whether this feature is already implemented in >> yade under some name that you can give me, or whether I need to port >> this to yade. >> >> best regards >> > > > > _______________________________________________ > Mailing list: https://launchpad.net/~yade-dev > Post to : yade-dev@lists.launchpad.net > Unsubscribe : https://launchpad.net/~yade-dev > More help : https://help.launchpad.net/ListHelp >
_______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
