Wall collisions not detected for large imported geometry

[darylbond]

I am attempting to run a DEM of a large imported mesh and am having some difficulty with getting the solver to detect collisions between the particles and the mesh. I am using a modified version of the SimpleChute example and an STL file that has dimensions of approximately 5m on a side but is made up of mostly a thin shell (dump body on a truck).

The first thing I noticed is that the algorithm for determining the grid size goes to 1 cell for this particular STL as it finds a very large radius (>100) and this drives the cell counts to 1 for this domain. Manually setting the grid size to a small number has some minimal success as it detects a very small fraction of the wall collisions but decreasing the grid size introduces issues with memory consumption. I haven't dug into the code but I am assuming that it uses some form of sdf on a grid to detect collisions and that getting a fine enough grid to detect the shape essentially just runs out of memory due to the dense grid?

I am wondering if it is possible to select an alternative form of collision detection for the walls?

I have included an example STL as a text file below.

underbody.txt

[Yihao-Shi]

You might consider generating a higher-quality mesh file for better accuracy. Alternatively, you can set WallType to Facet as another viable option.