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/3859e6c9-2ded-488e-b4cb-d3fa33b196c4n%40googlegroups.com.
