Hi, Janek: Nice to hear from you, thanks for providing and supporting YADE, again!:-)
Regarding your question, as far as I know packmol ( http://www.ime.unicamp.br/~martinez/packmol/home.shtml) can handle initial packing of spheres (or even complicated sphere clusters) by maintaining the minimum distance between the sphere centers using a BOX-QUACAN optimization, thus if you make the minimum distance greater than max(r_i)*2, you should have zero overlap between the spheres. Let me know if it is similar to you are looking for. On Thu, Apr 13, 2017 at 2:10 PM, Janek Kozicki <[email protected]> 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 > -- > Janek Kozicki http://janek.kozicki.pl/ | > > _______________________________________________ > Mailing list: https://launchpad.net/~yade-dev > Post to : [email protected] > Unsubscribe : https://launchpad.net/~yade-dev > More help : https://help.launchpad.net/ListHelp >
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