Hello,
Thank you, Ruochun Zhang, for your response; it was very helpful. I have a follow-up question: In the DEMdemo_ContactChain example, we use the line DEMSim.SetContactOutputContent(DEME_POINT | OWNER | FORCE | CNT_WILDCARD); to generate a CSV file similar to the attached one. My question is, does the force displayed in the file represent the force applied by B on A or by A on B? Additionally, are the force coordinates expressed in the reference frame related to the contact plane or in the absolute reference frame? If they are in the contact plane's reference frame, is there a way to convert them to the absolute reference frame? Thank you, Marouane Le samedi 20 juillet 2024 à 11:15:08 UTC+2, Ruochun Zhang a écrit : > Hi Marouane, > > Stock output methods *WriteSphereFile *and *WriteClumpFile *cannot add > contact information to the file. You can instead consider using the > dedicated method *WriteContactFile*. It will write the information of all > current contacts (geometries involved, contact point, force > magnitude/direction, etc., and you control what goes to the output by > *SetContactOutputContent*) to a file. Then you post-process the file to > get the "contact map" you want. *DEMdemo_ContactChain *is an example that > uses this method. If you have trouble interpreting the output contact file, > please post on the forum. > > I'd like to add that if you just need the contact pairs (IDs) and the *total > *force each clump experiences as a result of all the contacts surrounding > it, there's another approach. *DEMdemo_Indentation* uses *GetClumpContacts > *to query the IDs of the owners that are in contact with each clump, then > use this information to build a "contact map." Then the *total *force of > each clump experience can be extracted via trackers. The caveat, as I > mentioned, is you cannot easily get *each *force pair concerning a clump > because it's stored in a different way in memory to improve efficiency. > > Thank you, > Ruochun > > On Saturday, July 20, 2024 at 12:51:03 AM UTC+8 ermaro...@gmail.com wrote: > >> Hello, >> >> I'm currently working with the DEM-Engine for simulating granular flow, >> similar to the scenario in DEMO_Hopper_Cylinder_sphere. In this demo, the >> generated CSV files include data on position, radius, velocity, and family >> for each particle. What i want to do is to add contact forces : >> Specifically, for any given particle (let's call it Particle A), I want to >> identify all particles in contact with it, record the force exerted by each >> contacting particle, and include this information on the same dedicated >> line of the CSV file for Particle A. Is there an existing method or >> approach that would allow me to achieve this? >> >> Thank you! >> >> Marouane ELBISSOURI >> > -- 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 projectchrono+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/913aa07a-497d-43d8-b621-1d7bbed5ddd4n%40googlegroups.com.
