"NORMAL particle in a GHOST cell" in 24.1.1

kerenjie127
Thu, 16 May 2024 15:10:20 +0000

@cgcglw
So I have checked and tested your conveyor case, belows are what I found:

1. The boundary conditions are not set properly, you missed the vessel and the top belt location was not right.

2. This case comes with a calc_collision_wall_mod.f as a udf. It is a little bit outdated.

3. This case is kind of sensitive to particle shape, I tried with your glued sphere shape (needle-like), the simulation can run until some particles went through the gap between bottom belt and vessel. Then the “ghost in normal” error was triggered. I attached a snapshot for your reference:

4.After that, I changed the shape, decreased the height/radius ratio, kept the bounding diameter at the same level, the simulation can run to finish.. I attached the test folder for your reference.

Therefore, if you real need the origin shape you used, you might have to wait more time since it might not be a easy fixed, we have to carefully checkout the overall scheme for this particular needle shape as well as the particle-wall contact algorithm.

Thank you for testing the gsp model and detecting this issue, we will try to fix and improve the model ASAP.
conveyor_test.zip (1.7 MB)