This is not an official blogpost. It is only supportive material for our ICLR 2022 submission Boundary Graph Neural Networks for 3D Simulations.

BGNN Example Trajectories


Overview


Models with a Cohesive Material

Drum

Successful trial of training a BGNN for a cohesive material within a rotating drum (250.000 simulation time steps):

Example for Drum prediction with cohesive material

Hopper

Successful trial of training a BGNN for a cohesive material within a hopper device (100.000 simulation time steps):

Example for Hopper prediction with cohesive material


Models with a Non-Cohesive Material

Drum

Successful trial of training a BGNN for a non-cohesive material within a rotating drum (250.000 simulation time steps):

Example for Drum prediction with non-cohesive material

Hopper

Successful trial of training a BGNN for a non-cohesive material within a hopper device (100.000 simulation times teps):

Example for Hopper prediction with non-cohesive material - Geometry 1

Example for Hopper prediction with non-cohesive material - Geometry 2


Failures

Drum

Failure trial of training a BGNN for a cohesive material within a rotating drum (250.000 simulation time steps):

poor drum trajectory prediction

Hopper

Failure trial of training a BGNN for a cohesive material within a hopper device (100.000 simulation time steps):

poor hopper trajectory prediction

Comment on Failures

Local (small) modeling errors of particle-wall interactions result in a leak in the wall and some particles incorrectly cross the wall, whereafter many other particles follow through the leak


Out-of Distribution (OOD) Experiments

Drum

The upper animation below shows a typical training example, while the animation directly beneath is an OOD example. For OOD test samples the length of the cylinder has increased compared to training and test samples.

typical drum trajectory prediction (train)

ood drum trajectory prediction (test)

Hopper

The upper animation below shows a typical training example, while the animation directly beneath is an OOD example. For OOD test samples the outlet hole size has decreased and the inclination angle has increased.

typical hopper trajectory prediction (train)

ood hopper trajectory prediction (test)