Open Mathias0 opened 11 months ago
Thanks for your interest.
I think the problem is related to the contact algorithm between different materials in the current version of the Taichi MPM engine used in this repo. To accomplish a more reasonable result as you described, the Taichi MPM engine should be improved.
Dear developper, Thank you very much for you codes! I saw the paper "Drucker-Prager Elastoplasticity for Sand Animation" and I want to reproduce the animation shown in Fig.1 : Sand falls through the narrow neck of an hourglass, accumulating at the bottom.
Using the custom particle data interface, I can put a funnel-like obstale in the simulation zoom. I set its material as material_stationary. I also filled the funnel with sand (material_sand).
After I run the simulation, the sands firstly flow out from the nozzle, but some sands also gradually penetrate the lateral of the funnel. As a result, after some time, most sands penetrate the funnel and flow down from somewhere other than the nozzle.
In these figures, blue particles are sand, red particles are material_stationary. I also tried increasing the particle density of the funnel but this phenomenon still exists. I want to know whether it is a bug ? how to prevent the penetration?
I attach the csv files of funnel and initial sand here: funnel.csv sand.csv
Thank you in advance!