chiara modenese said: (by the date of Fri, 2 Jul 2010 23:34:21 +0000) > > > decreases and no slip occurs since the function plasticDissipation() of > > > Law2_ScGeom_FrictPhys_Basic contact law returns 0. I have already checked > > on > > > paper and discussed with Bruno and the code which computes > > > plasticDissipation in ScGeom is formally correct. > > > > How about heat? Usually friction increases temperature of those > > bodies that are in friction. But in yade we don't have heat, so this > > turns into an energy loss. > > > In fact there is no heat effect at all in Yade, Janek could you elaborate > your thought? Energy must be conserved as long as the system is closed. I am > trying to see in a TT simulation what happens. Bruno, have you tried it? > Actually I am thinking to inlcude in the TTRecorder the various energy > terms, mechanical energy and so on.
heat from friction should proportional to the total path that has slipped. A simplest way to track that is to just keep track of how long distance [m] everything has slipped, and use some conversion from distance to energy, due to friction. Eg. calculate the work: W=F*x. Better stay with energy than go to heat & temperature, because if you decided to go into thermodynamics, you will add a work worth of a second PhD to what you are already doing. Heat transfer, specific heat capacity, phase changes (a molten sphere?) and all that stuff. It appears that plasticDissipation() counter is almost what you need here - the simpler (non thermodynamic) approach which I mentioned above. I didn't know about it - when did you add this? (time to rediscover yade for me ;). best regards -- Janek Kozicki http://janek.kozicki.pl/ | _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp