On 2 July 2010 23:27, Janek Kozicki <[email protected]> wrote: > (sorry, working over vnc caused me to accidentally send before I > finished writing this email - sending again) > > chiara modenese said: (by the date of Fri, 2 Jul 2010 17:41:36 +0100) > > > Hi guys, > > > > I am experiencing again a bit of troubles with total energy conservation. > > For a sphere-sphere impact test everything seems fine. Now I have tried > > another simple example: few spheres with an input initial velocity in a > box. > > I attach the script, if you run it you will obtain the plot in the > attached > > figure. If there is no friction, then total energy is more or less > constant > > as shown in the first part of the plot (not exactly constant due to the > way > > we compute velocities, as already discussed in this thread > > http://www.mail-archive.com/[email protected]/msg01729.html > ). > > However, as long as I include some friction, both total and kinetic > energy > > 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. Chiara
> > > -- > Janek Kozicki http://janek.kozicki.pl/ | > > _______________________________________________ > 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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