MarcoDottor a écrit : > Hello > > I have a lot of questions for you: > > The thesis I'm working on is about improving the design of the debris > transport of a driller,the better way to simulate this in my opinion is > with DEM where i can see the particle dynamics. > > I set up a simulation and the first question is: > > The mean radius of the debris is about 0.0004 m, in this case the > critical timestep is 10^-6 and with many particles it takes too much > time to have a one or two minutes simulation, in Your opinion could I > use a scaled model to have a bigger radius ad a bigger timestep, how > should I modify set up parameters like Gravity, should I leave 9.81 > cause the mass is auto calculated from dimensions?
As Bruno said, there is probably no direct response about the possibility to use a scaled model for your problem of debris transport. In my opinion, simulate one or two minutes of real time with DEM is quit a lot (1 min with a timestep of 1e-6 s means 60 million of iterations, with 10000 particles is a lot!). But, there are solutions. For instance the problem is the same in soil-mechanics when we simulate laboratory tests. The duration of a real test can be several minutes, or a few hours.... But we can show, from a numerical point a view, that in specific conditions we can numerically accelerate the simulation of the laboratory test in order to simulate only few seconds of real time. Good luck! Luc > Of course all the force in action would be very much larger loosing the > adherence to reality and some potential useful informations, from the > point of view of particle motion, this scaling would change the final > result, in the sense that i would like to see how particles moves to > improve design. > > I read a lot of posts of the mailing list but I have not found anything > about commanding the Yade player with Python, for example i saved a > simulation in SQLite, but the clipping plane make scene cut, How can I > change clipping plane? > > How can I set particle links with python script, there is a function > that at a certain level of force breack the links? > > Thank you very much for your time > > Marco -- 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 _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp _______________________________________________ yade-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/yade-users
