Hi Bona, Thanks for sharing the source code. I will look into it and will reach out if I have any questions/confusion.
Thanks, Prabhat On Thursday, May 23, 2024 at 10:53:57 AM UTC-7 [email protected] wrote: > Hi Prabhat, > > you will find the new case at > https://github.com/projectchrono/DEM-Engine/blob/main/src/demo/DEMdemo_ContactChain.cpp > . > > Note that he initial particle positioning was created as a list (outside > of DEME). This allows keeping the template concise while only leveraging > DEME's features (such as initiating simulations from files, changing > properties on the fly, single instance control). > > Thank you, > Bonaventura > > On Tuesday, May 14, 2024 at 1:48:37 PM UTC+2 Ruochun Zhang wrote: > >> Hi Prabhat, >> >> Bona will be following up on this question on this thread soon. >> >> Thank you, >> Ruochun >> >> On Tuesday, May 14, 2024 at 5:29:08 AM UTC+8 [email protected] wrote: >> >>> Hi, I'm just following up on my message here. >>> >>> On Thursday, May 9, 2024 at 2:00:49 PM UTC-7 Prabhat Paudyal wrote: >>> >>>> Thank you Ruochun for letting me know. One more thing: when can we >>>> expect to see the demo script of the Goldenberg test example in the repo? >>>> I >>>> don't think it is there. >>>> >>>> Thanks, >>>> Prabhat >>>> >>>> On Tuesday, April 30, 2024 at 5:26:15 AM UTC-7 Ruochun Zhang wrote: >>>> >>>>> Hi Prabhat, >>>>> >>>>> It's published and can be found here >>>>> https://www.sciencedirect.com/science/article/pii/S001046552400119X?via%3Dihub >>>>> >>>>> Thank you, >>>>> Ruochun >>>>> >>>>> On Wednesday, April 3, 2024 at 3:27:46 AM UTC+8 [email protected] wrote: >>>>> >>>>>> Hi Ruochun, >>>>>> >>>>>> Thank you so much for your response. I would very much appreciate it >>>>>> if you notify me once the paper gets published. >>>>>> >>>>>> Thanks, >>>>>> Prabhat >>>>>> >>>>>> On Tuesday, March 26, 2024 at 3:29:16 AM UTC-7 Ruochun Zhang wrote: >>>>>> >>>>>>> Hi Prabhat, >>>>>>> >>>>>>> To answer your question: You probably see a warning in your output >>>>>>> file, >>>>>>> """" >>>>>>> WARNING! At least one clump is initialized with a position out of >>>>>>> the box domain you specified. >>>>>>> It is found at 0.378, 0, 0.076383 (this message only shows one such >>>>>>> example). >>>>>>> This simulation is unlikely to go as planned. >>>>>>> """ >>>>>>> This is the problem. It appears that the points you sampled live in >>>>>>> x∈[0, 0.4], but the x range of your simulation world is defined as >>>>>>> something like [-0.25, 0.25]. This will make the particles to be >>>>>>> initialized in unexpected locations, cause large initial penetrations, >>>>>>> and >>>>>>> then destabilize the simulation. I fixed the world size definition, and >>>>>>> it >>>>>>> seems to fix the problem. The extremely fine step size you are using is >>>>>>> not >>>>>>> necessary: The physics in this simulation is simple. >>>>>>> >>>>>>> By the way, in the upcoming paper about DEME >>>>>>> <https://arxiv.org/abs/2311.04648>, we will include a Goldenberg >>>>>>> test example, and provide the associated demo script. If you want, we >>>>>>> can >>>>>>> let you know when it is officially published. >>>>>>> >>>>>>> Thank you, >>>>>>> Ruochun >>>>>>> On Tuesday, March 26, 2024 at 1:41:58 AM UTC+8 [email protected] >>>>>>> wrote: >>>>>>> >>>>>>>> Hello everyone, >>>>>>>> >>>>>>>> I have been trying to replicate the 2D Goldenberg et al experiment >>>>>>>> <https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.084302> >>>>>>>> in >>>>>>>> DEME. It was replicated as a validation study for Chrono::GPU (as >>>>>>>> described >>>>>>>> in the 2021 paper <https://doi.org/10.3390/pr9101813>), so I >>>>>>>> figured it could be easily done in DEME too. However, I am having some >>>>>>>> issues with generating particles and having them settle under gravity. >>>>>>>> I >>>>>>>> have been using a nested for loop to generate the initial positions of >>>>>>>> particles and while I don't have any issues with the generation of >>>>>>>> positions (see attached paraview screenshot), I encounter the >>>>>>>> excessive >>>>>>>> velocity run-time error while settling the particles under gravity. I >>>>>>>> have >>>>>>>> tried to decrease the step size, increase the box domain dimensions to >>>>>>>> eliminate boundary effects, relax the physics (decrease the Young's >>>>>>>> modulus >>>>>>>> of the terrain), and increased the initial safety distance of the >>>>>>>> particles >>>>>>>> to no avail. >>>>>>>> >>>>>>>> I have attached my code to this message and I have been modifying >>>>>>>> the 2D ball drop demo. >>>>>>>> >>>>>>>> Thanks and regards, >>>>>>>> Prabhat >>>>>>>> >>>>>>> -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/3504f3e0-4d2d-4bea-a4e6-628d7f8a1275n%40googlegroups.com.
