New question #707955 on Yade:
https://answers.launchpad.net/yade/+question/707955
Hello Yade Community,
I'm working on a simulation to create a sample through natural sedimentation.
Here's a brief description of my issue:
I'm trying to create a specimen through natural sedimentation.
By setting O.periodic=True, I've established periodic boundary conditions
laterally and fixed boundary conditions vertically using a Facet whose position
is fixed at the bottom.
I generate particles at a height well above the target, allow them to settle
under gravity, and once the average coordination number surpasses 3, I aim to
delete particles above a specific height to achieve a group of particles at the
desired height.
However, after deleting the particles using the code below, the program stops
after a certain number of iterations (ranging from a few tens to thousands).
There's no error message displayed in the terminal.
Moreover, the iteration at which the program stops varies with each script
execution.
I'm puzzled by this unexpected behavior, especially given the absence of any
error messages. Any insights or suggestions would be greatly appreciated.
Thank you in advance for your assistance.
# Environment:
Execution Command: yade -j16 code.py
Yade Version: 2022.01a
Linux Version: Ubuntu 22.04.3 LTS
Architecture: amd64
# Script (MWE):
from yade import pack, utils
import numpy as np
state_index = 0
pack_sp = pack.SpherePack()
pack_sp.makeCloud((0.02, 0.02, 0.02),
(0.08, 0.98, 0.08),
rMean=0.01)
sphere_id = pack_sp.toSimulation()
O.periodic = True
base_facet_1 = utils.facet([Vector3(-0.02, 0, -0.02),
Vector3(0.12, 0, -0.02),
Vector3(-0.02, 0, 0.12)],
fixed=True)
base_facet_2 = utils.facet([Vector3(0.12, 0, 0.12),
Vector3(0.12, 0, -0.02),
Vector3(-0.02, 0, 0.12)],
fixed=True)
base_facet_id = O.bodies.append([base_facet_1, base_facet_2])
O.cell.hSize = Matrix3(0.1, 0, 0,
0, 1, 0,
0, 0, 0.1)
O.periodic = True
O.engines = [
ForceResetter(),
InsertionSortCollider(
[Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()], allowBiggerThanPeriod=True),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(), Ig2_Facet_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]),
NewtonIntegrator(damping=0.2, gravity=(0, -9.81, 0)),
PyRunner(iterPeriod=100, command="checkState()")
]
O.dt = PWaveTimeStep() * 0.5
def checkState():
global sphere_id, state_index
if state_index == 0:
temp_sphere_coord_num = [len(O.interactions.withBody(i)) for i in
sphere_id]
temp_sphere_Y = [O.bodies[i].state.pos[1] for i in sphere_id]
temp_sphere_data = np.array([sphere_id, temp_sphere_coord_num,
temp_sphere_Y])
if temp_sphere_data[1, :].mean() >=3:
temp_unused_sphere_id = temp_sphere_data[0, temp_sphere_data[2, :]
> 0.1]
for temp_unused_sphere_id_each in temp_unused_sphere_id:
O.bodies.erase(int(temp_unused_sphere_id_each))
sphere_id.remove(int(temp_unused_sphere_id_each))
print("some particles are deleted at", O.iter)
state_index = 1
elif state_index == 1:
pass
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