for x in L: #loop creating a set of sphere sticked at the bottom with a (uniform) random altitude comprised between 0.5 (diameter/12) and 5.5mm (11diameter/12) with steps of 0.5mm. The repartition along z is made around groundPosition.
for y in W:
n = rand.randrange(
0, 12, 1
) / 12.0 * diameterPart #Define a number between 0 and 11/12 diameter with steps of 1/12 diameter (0.5mm in the experiment)
O.bodies.append(
sphere((x * diameterPart, y * diameterPart,
groundPosition - 11 * diameterPart / 12.0 / 2.0 + n),
diameterPart / 2.,
color=(0, 0, 0),
fixed=True,
material='Mat'))
#Create a loose cloud of particle inside the cell
partCloud = pack.SpherePack()
partVolume = pi / 6. * pow(diameterPart, 3) #Volume of a particle
partNumber = int(
Nlayer * phiPartMax * diameterPart * length * width /
partVolume) #Volume of beads to obtain Nlayer layers of particles
partCloud.makeCloud(minCorner=(0, 0., groundPosition + diameterPart),
maxCorner=(length, width, groundPosition + fluidHeight),
rRelFuzz=0.,
rMean=diameterPart / 2.0,
num=partNumber)
partCloud.toSimulation(
material='Mat') #Send this packing to simulation with material Mat
#Evaluate the deposition time considering the free-fall time of the highest particle to the ground
depoTime = sqrt(fluidHeight * 2 / abs(gravityVector[2]))
# Collect the ids of the spheres which are dynamic to add a fluid force through HydroForceEngines
# encoding: utf-8
# 2012 ©Bruno Chareyre <*****@*****.**>
# This variant of triax-basic.py shows the usage of cohesive contact laws and moments at contacts
from yade import pack
sp = pack.SpherePack()
## corners of the initial packing
mn, mx = Vector3(0, 0, 0), Vector3(10, 10, 10)
## box between mn and mx, avg radius ± ½(20%), 2k spheres
sp.makeCloud(minCorner=mn, maxCorner=mx, rRelFuzz=.2, num=600)
## create material #0, which will be used as default
O.materials.append(
CohFrictMat(young=15e6,
poisson=0.4,
density=2600,
frictionAngle=radians(30),
normalCohesion=1e6,
shearCohesion=1e6,
momentRotationLaw=True,
etaRoll=0.1,
label='spheres'))
O.materials.append(
FrictMat(young=15e6,
poisson=.4,
frictionAngle=0,
density=0,
label='frictionlessWalls'))
#wallMask
#determines which walls will be created, in the order
#-x(1), +x (2), -y (4), +y (8), -z (16), +z (32). The numbers are ANDed; the
#default 63 means to create all walls
#parameter1:center
#parameter2:half size
box = geom.facetBox(( box_length/2, box_height/2,box_depth/2), ( box_length/2, box_height/2,box_depth/2),
wallMask = 55,
material = frict)
O.bodies.append(box)
#adding deposit -----
sample = pack.SpherePack()
#parameter1:left lower corner
#parameter2:right upper corner
sample.makeCloud((0.0, 0.0, 0.0), ( box_length, box_height,box_depth), rMean = 0.6, rRelFuzz = 0.12)
s = sample.toSimulation(material = temp_con)
#2019-01-19 weihuajing
#change to a real 2D simulation
# fix spin in y x
# fix z-postion
#defining engines -----
thres = 1000
O.engines = [
ForceResetter(),
from yade import pack, plot
utils.readParamsFromTable(useL3Geom=True,
nonviscDamp=0,
frictAngle=0,
useClumps=False,
noTableOk=True)
from yade.params import table
if 1:
sp = pack.SpherePack()
# bunch of balls, with an infinite plane just underneath
if not table.useClumps:
sp.makeCloud((0, 0, 0), (1, 1, 1), .05, .5)
# use clumps of 2 spheres instead, to have rotation without friction
else:
sp.makeClumpCloud(
(0, 0, 0), (1, 1, 1),
[pack.SpherePack([((0, 0, 0), .05), ((0, 0, .08), .02)])],
periodic=False)
sp.toSimulation()
else:
O.bodies.append(utils.sphere((0, 0, 2),
radius=.5)) # one single bouncing ball
O.bodies.append(utils.wall(position=0, axis=2, sense=1))
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),
Bo1_Wall_Aabb()]),
InteractionLoop([
# create a few clump configurations by hand
from yade import pack
c1 = pack.SpherePack([((0, 0, 0), .5), ((.5, 0, 0), .5), ((0, .5, 0), .3)])
c2 = pack.SpherePack([((0, 0, 0), .5), ((.7, 0, 0), .3), ((.9, 0, 0), .2)])
sp = pack.SpherePack()
print 'Generated # of clumps:', sp.makeClumpCloud((0, 0, 0), (15, 15, 15),
[c1, c2],
periodic=False)
sp.toSimulation()
O.bodies.append(utils.wall(position=0, axis=2))
O.engines = [
#SubdomainBalancer(),
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),
Bo1_Wall_Aabb()]),
InteractionLoop([Ig2_Sphere_Sphere_ScGeom(),
Ig2_Wall_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]),
NewtonIntegrator(damping=.4, gravity=(0, 0, -100))
]
O.dt = .7 * utils.PWaveTimeStep()
O.saveTmp()
O.step()
# -*- coding: utf-8 -*- from yade import pack num_spheres=1000 compFricDegree = 30 targetPorosity = 0.43 finalFricDegree = 30 rate=-0.02 damp=0.2 stabilityThreshold=0.01 young=5e6 mn,mx=Vector3(0,0,0),Vector3(1,1,1) O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=radians(compFricDegree),density=2600,label='spheres')) O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls')) walls=aabbWalls([mn,mx],thickness=0,material='walls') wallIds=O.bodies.append(walls) sp=pack.SpherePack() clumps=False if clumps: volume = (mx[0]-mn[0])*(mx[1]-mn[1])*(mx[2]-mn[2]) mean_rad = pow(0.09*volume/num_spheres,0.3333) c1=pack.SpherePack([((-0.2*mean_rad,0,0),0.5*mean_rad),((0.2*mean_rad,0,0),0.5*mean_rad)]) sp.makeClumpCloud(mn,mx,[c1],periodic=False) sp.toSimulation(material='spheres') O.bodies.updateClumpProperties() else: sp.makeCloud(mn,mx,-1,0.3333,num_spheres,False, 0.95,seed=1) O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp]) triax=TriaxialStressController( maxMultiplier=1.0+2e4/young,
# encoding: utf-8
#
# demonstrate how to generate sphere packing based on arbitrary PSD (particle size distribution)
# show the difference between size-based and mass-based (≡ volume-based in our case) PSD
#
import matplotlib
matplotlib.rc('axes', grid=True)
from yade import pack
import pylab
# PSD given as points of piecewise-linear function
psdSizes, psdCumm = [.02, 0.04, 0.045, .05, .06, .08,
.12], [0., 0.1, 0.3, 0.3, .3, .7, 1.]
pylab.plot(psdSizes, psdCumm, label='precribed mass PSD')
sp0 = pack.SpherePack()
sp0.makeCloud((0, 0, 0), (1, 1, 1),
psdSizes=psdSizes,
psdCumm=psdCumm,
distributeMass=True)
sp1 = pack.SpherePack()
sp1.makeCloud((0, 0, 0), (1, 1, 1),
psdSizes=psdSizes,
psdCumm=psdCumm,
distributeMass=True,
num=5000)
sp2 = pack.SpherePack()
sp2.makeCloud((0, 0, 0), (1, 1, 1),
psdSizes=psdSizes,
psdCumm=psdCumm,
distributeMass=True,
num=20000)
pylab.semilogx(*sp0.psd(bins=30, mass=True),
def stopSimulation(spheres_base):
progress = O.iter // savePeriod
print('iter', O.iter)
print('')
'''A'''
if O.iter % savePeriod == 0:
out_file = open(folder_name + '/A_progress=%d' % progress + ".txt",
'w')
y_max_base = max(
[this_sphere.state.pos[1] for this_sphere in spheres_base])
print('max height of base is %.2f' % y_max_base)
spheres = [
O.bodies[k] for k in range(10, len(O.bodies))
if O.bodies[k] != None
]
if O.iter == savePeriod:
#save the state every 10% of the progress
x_max = np.max(
[this_sphere.state.pos[0] for this_sphere in spheres])
y_max = np.max(
[this_sphere.state.pos[1] for this_sphere in spheres])
x_min = np.min(
[this_sphere.state.pos[0] for this_sphere in spheres])
y_min = np.min(
[this_sphere.state.pos[1] for this_sphere in spheres])
x_aerolite = (x_min + x_max) * 0.5
y_aerolite = 2 * y_max
z_aerolite = box_depth / 2
r_aerolite = 5
#adding deposit -----
deposit = pack.SpherePack()
deposit.makeCloud((x_aerolite, y_aerolite, z_aerolite),
(x_aerolite, y_aerolite, z_aerolite),
rMean=r_aerolite,
rRelFuzz=0.0)
deposit.toSimulation(material=m_rock)
print('amount of deposit', len(deposit))
a = len(O.bodies) - len(deposit)
b = len(O.bodies)
spheres_deposit = [O.bodies[idx] for idx in range(a, b)]
color_idx = O.iter // savePeriod - 1
for this_sphere in spheres_deposit:
this_sphere.shape.color = deposit_rgb_list[color_idx]
RecordData(out_file, spheres)
'''B'''
if O.iter % savePeriod == 3 * checkPeriod:
#flag to deposit
flag_deposit = True
out_file = open(folder_name + '/B_progress=%d' % progress + ".txt",
'w')
spheres = [
O.bodies[k] for k in range(10, len(O.bodies))
if O.bodies[k] != None
]
RecordData(out_file, spheres)
#end the loop
if O.iter == 5 * savePeriod + 3 * checkPeriod:
O.pause()
print('')
print('-- Simulation off')
flag_deposit = False
InteractionLoop([Ig2_Sphere_Sphere_ScGeom(),
Ig2_Facet_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]),
NewtonIntegrator(damping=0.7, gravity=[0, 0, -9.81])
]
#create a box:
O.bodies.append(
geom.facetBox(center=(0.0, 0.0, 0.25),
extents=(0.125, 0.125, 0.25),
wallMask=31))
#add particles eiter spheres or clumps
if partType == 'spheres':
sp = pack.SpherePack()
sp.makeCloud((-0.125, -0.125, 0), (0.125, 0.125, 0.5),
rMean=37.6e-3 / 2.,
rRelFuzz=0.0,
num=100)
sp.toSimulation()
O.bodies.updateClumpProperties(
discretization=10) # correct mass, volume, inertia!!
elif partType == 'clumps':
sp = pack.SpherePack()
c1 = pack.SpherePack([((0., 0., 0.), 37.6e-3 / 2.),
((37.6e-3 / 2., 0., 0.), 25e-3 / 2.)
]) # overlap between both spheres
sp.makeClumpCloud((-0.125, -0.125, 0), (0.125, 0.125, 0.5), [c1], num=80)
sp.toSimulation()
O.bodies.updateClumpProperties(
# Controlling of strain and stresses is performed via PeriTriaxController,
# of which parameters determine type of control and also stability
# condition (maxUnbalanced) so that the packing is considered stabilized
# and the stage is done.
#
sigmaIso = -1e5
#import matplotlib
#matplotlib.use('Agg')
# generate loose packing
from yade import pack, qt, plot
O.periodic = True
sp = pack.SpherePack()
if 0:
## uniform distribution
sp.makeCloud((0, 0, 0), (2, 2, 2), rMean=.1, rRelFuzz=.3, periodic=True)
else:
## create packing from clumps
# configuration of one clump
c1 = pack.SpherePack([((0, 0, 0), .03333), ((.03, 0, 0), .017),
((0, .03, 0), .017)])
# make cloud using the configuration c1 (there could c2, c3, ...; selection between them would be random)
sp.makeClumpCloud((0, 0, 0), (2, 2, 2), [c1], periodic=True, num=500)
# setup periodic boundary, insert the packing
sp.toSimulation()
O.engines = [
density1 = 2650
# Other Constants
g = -9.806 #Gravitational acceleration
numDamping = 0.6
numParticles = 100
# Material is created
O.materials.append((FrictMat(young=E1, poisson=poisson1, density=density1)))
mat1 = O.materials[0]
# Geometries (facets on 6 sides, two vectors correspond to center and extent)
O.bodies.append(utils.geom.facetBox((0.2, 0.2, 1), (0.2, 0.2, 1), wallMask=63))
# Particle cloud
sp1 = pack.SpherePack()
sp1.makeCloud((0, 0, 0), (0.4, 0.4, 2),
rMean=.05,
rRelFuzz=0,
num=numParticles)
sp1.toSimulation()
for b in O.bodies:
b.mat = mat1
# Engines
O.engines = [
ForceResetter(),
InsertionSortCollider(
[Bo1_Sphere_Aabb(),
Bo1_Facet_Aabb(),
Bo1_Wall_Aabb()]),
