Re: [Yade-users] [Question #643660]: A simple question on interactionDetectionFactor
Question #643660 on Yade changed: https://answers.launchpad.net/yade/+question/643660 Huihuang Xia confirmed that the question is solved: Thanks Robert Caulk, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ 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
Re: [Yade-users] [Question #643660]: A simple question on interactionDetectionFactor
Question #643660 on Yade changed: https://answers.launchpad.net/yade/+question/643660 Status: Answered => Solved Huihuang Xia confirmed that the question is solved: Thanks Luc and Robert, you solved my problem. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ 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
Re: [Yade-users] [Question #643660]: A simple question on interactionDetectionFactor
Question #643660 on Yade changed: https://answers.launchpad.net/yade/+question/643660 Robert Caulk proposed the following answer: I think the idea of an interaction range is brilliant, it opens up a huge area of functionality that did not previously exist in yade. I too found the sentence in that paper a little brief, so I took some time to derive the equation. Here was my thought process: Worst case scenario is that two maximum-sized particles might be interacting. We want to avoid allowing a minimum sized particle between two interacting particles. So we know the maximum allowable Deq<2*R_min+2*R_max (distance between 2 max sized particle centers with a minimum sized particle in between). And the maximum possible Deq for a given packing Deq = gamma_int*(R_max+R_max). Solving for gamma_int to satisfy both conditions: gamma_int < (R_min+R_max)/(R_max) So in your case (R_max/R_min = 9), your max gamma_int would be 1.11 to avoid overlapping small particles. It is probably worth saying that in my experience you can go a bit above the maximum without seeing any negative consequences. Actually, I have noticed that I [i]need[/i] to go above the maximum to calibrate toughness...hmmm. Cheers, Robert -- You received this question notification because your team yade-users is an answer contact for Yade. ___ 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
Re: [Yade-users] [Question #643660]: A simple question on interactionDetectionFactor
Question #643660 on Yade changed: https://answers.launchpad.net/yade/+question/643660 Status: Open => Answered Luc Scholtès proposed the following answer: Hello, We mentioned intR<1.5 for Rmax/Rmin=2 so the near neighbour interactions keep conceptually "representative" of a rock microstructure even though, I agree with you, it was not clearly explained. It is not easy to explain but I'll try anyway: Lets consider a line of 3 particles 1, 2, 3 such that R1=2, R2=1 and R3=2. If you create bonds such as intR>1.5, then 1 and 3 will be bonded together. A bond will thus be created "over" 2. In granular materials such as granite or sandstone (where only contacting grains interact one with each other), this is physically not acceptable. Then, if your idea is to discuss the influence of the microstructure of the medium on its overall behavior, this might be problematic. I must precise that this sort of long range interactions might nonetheless exist in some materials with exotic grain to grain interactions (e.g. Van Der Waals forces). Now, even though this can be conceptually not exactly representative of the way grains interact in a geomaterial, it might nonetheless be an acceptable way to overcome some difficulties faced by classic bonded particle models to deal with certain types of cohesive materials (under the condition that no direct link is done between the numerical particles and the real grains). Another way to deal with such "non physically acceptable" interactions would be to use an enhanced contact law that would increased the degree of interlocking of grains (e.g. flat joint contact model in PFC, or moment contact law in YADE). Luc -- You received this question notification because your team yade-users is an answer contact for Yade. ___ 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