Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Bruno Chareyre posted a new comment: Hi, You are right and the reason for that is that a periodic problem has no boundary, hence no boundary condition. bndCondIsPressure=[X,X,0,0,X,X] is ok but you need to impos

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Luc Scholtès posted a new comment: Based on my latest searches and testing, here are some conclusions (please correct me if I am wrong): 1) Due to the periodic boundaries in x and z, assigning bndCondIsPressure=

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Luc Scholtès posted a new comment: Hi Bruno, Thank you for your message. I figured out the pressure gradient thanks to the reference given byJerome. Also, I made a mistake in my previous message regarding the na

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Bruno Chareyre posted a new comment: Hi Luc, First, the pressure gradient is not "along periodic boundary conditions". It is just the pressure gradient, a vector. Second, what made you think that boundaryUseMaxM

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Status: Open => Solved Luc Scholtès confirmed that the question is solved: Thank you Jerome. The link you sent me is broken (I get a picture of a squirrel instead...) but I could find the article anyway. I'

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Jérôme Duriez posted a new comment: Hi, Maybe it's worth for you to give a look to http://people.3sr- grenoble.fr/users/bchareyre/pubs/Marzougui2015.pdf and its § "Periodic Boundary Conditions" ? This suggests

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Status: Answered => Open Luc Scholtès is still having a problem: Yes, I figured it could be a problem with the BC... My model is a cube set up with (xmin, xmax, ymin, ymax) as periodic boundaries and (zmin,

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Robert Caulk posted a new comment: Hey Luc, I receive the same error as you after running the simulation out :-( I think this: CHOLMOD warning: matrix not positive definite something went wrong in Cholesky fac

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Luc Scholtès posted a new comment: Hi Robert (and Lingran), Unfortunately, even with a timestep equal to 1e-9, I get the same behavior (explosion)... In addition, I now get this at the first iteration and at dif

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 lingran.zhang posted a new comment: Hello Luc, When running your script with reduced time step, my simulation explodes shortly (in several time steps) after the flow engine is activated (I guess yade on both of

Re: [Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

Question #662105 on Yade changed: https://answers.launchpad.net/yade/+question/662105 Status: Open => Answered Robert Caulk proposed the following answer: Hey Luc, I tried your script, and I can confirm the explosion. I managed to stabilized the simulation by reducing the timestep: flow.is

[Yade-users] [Question #662105]: simulation explodes as soon as flow engine is activated

New question #662105 on Yade: https://answers.launchpad.net/yade/+question/662105 Hello there, I have been struggling with this for a while now and could not figure out what is wrong. My simulation (shear test with periodic boundary conditions) explodes as soon as the flow engine is activated (