def checkForce():
# at the very start, unbalanced force can be low as there is only few
# contacts, but it does not mean the packing is stable
if O.iter < 20000:
return
# the rest will be run only if unbalanced is < .1 (stabilized packing)
timing.reset()
if unbalancedForce() > 0.2:
return
# add plate at upper box side
highSphere = 0.0
for b in O.bodies:
if highSphere < b.state.pos[2] and isinstance(b.shape, Sphere):
highSphere = b.state.pos[2]
else:
pass
O.bodies.append(
wall(highSphere + 0.5 * Diameter, axis=2, sense=-1, material=mat1))
# without this line, the plate variable would only exist inside this
# function
global plate
plate = O.bodies[-1] # the last particles is the plate
# Wall objects are "fixed" by default, i.e. not subject to forces
# prescribing a velocity will therefore make it move at constant velocity
# (downwards)
plate.state.vel = (0, 0, -.1)
# start plotting the data now, it was not interesting before
O.engines = O.engines + [
PyRunner(command='addPlotData()', iterPeriod=1000)
]
# next time, do not call this function anymore, but the next one
# (unloadPlate) instead
fCheck.command = 'unloadPlate()'
def checkForce():
# at the very start, unbalanced force can be low as there is only few
# contacts, but it does not mean the packing is stable
if O.iter < 20000:
return
# the rest will be run only if unbalanced is < .1 (stabilized packing)
timing.reset()
if unbalancedForce() > 0.2:
return
# add plate at upper box side
highSphere = 0.0
for b in O.bodies:
if highSphere < b.state.pos[2] and isinstance(b.shape, Sphere):
highSphere = b.state.pos[2]
else:
pass
O.bodies.append(wall(highSphere+0.5*Diameter, axis=2, sense=-1, material=mat1))
# without this line, the plate variable would only exist inside this
# function
global plate
plate = O.bodies[-1] # the last particles is the plate
# Wall objects are "fixed" by default, i.e. not subject to forces
# prescribing a velocity will therefore make it move at constant velocity
# (downwards)
plate.state.vel = (0, 0, -.1)
# start plotting the data now, it was not interesting before
O.engines = O.engines + [PyRunner(command='addPlotData()', iterPeriod=1000)]
# next time, do not call this function anymore, but the next one
# (unloadPlate) instead
fCheck.command = 'unloadPlate()'
O.engines = [
ForceResetter(),
InsertionSortCollider([
Bo1_Sphere_Aabb(),
Bo1_Facet_Aabb(),
]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),
Ig2_Facet_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()],
),
RotationEngine(rotateAroundZero=True,
zeroPoint=(0, 0, 0),
rotationAxis=(0, 1, 1),
angularVelocity=30 * (2 * pi / 60),
ids=cylIds,
label='rotor'),
NewtonIntegrator(damping=.3, gravity=(
0, 0, -1e3)), # gravity artificially high, to make it faster going ;-)
]
O.dt = PWaveTimeStep()
O.stopAtIter = int(2 * pi / (rotor.angularVelocity * O.dt))
O.timingEnabled = True
timing.reset()
from yade import qt
qt.Controller()
qt.View()
facet([[1,-1,0],[0,1,0,],[1,.5,.5]],fixed=True,material=mat)
])
import random
if 1:
for i in range(0,100):
O.bodies.append(sphere([random.gauss(0,1),random.gauss(0,1),random.uniform(1,2)],random.uniform(.02,.05),material=mat))
O.bodies[len(O.bodies)-1].state.vel=Vector3(random.gauss(0,.1),random.gauss(0,.1),random.gauss(0,.1))
else:
O.bodies.append(sphere([0,0,.6],.5),material=mat)
O.dt=1e-4
O.saveTmp('init')
# compare 2 colliders:
if 1:
O.timingEnabled=True
from yade import timing
for collider in InsertionSortCollider(),PersistentTriangulationCollider(haveDistantTransient=True):
for i in range(2):
O.loadTmp('init')
replaceCollider(collider)
O.run(100,True)
timing.reset()
O.run(50000,True)
timing.stats()
else:
#O.run(100,True)
O.step()
print len(O.interactions)
#O.bodies[2].phys['se3']=[-.6,0,.6,1,0,0,0]
#O.step()
from yade import pack,timing
cyl=unitCylinder(); sq=unitSquare(); sq.translate(0,0,-1); cyl.copy(sq)
cyl.scale(cylRd,cylRd,.5*cylHt); cyl.rotate(1,0,0,-pi/4) # 45° anti-colckwise in the yz plane
# calling gtsSurface2Facets with just "cyl" (without constructing the faces tuple) ignores 2 faces that were copy'd before; bug in pygts?
cylIds=O.bodies.append(pack.gtsSurface2Facets(cyl))
sp=pack.SpherePack(); wd=cylRd*sqrt(2); rMean=(.2*wd*wd*cylHt/(nSpheres*(4/3.)*pi))**(1/3.)
print('Generating cloud…')
sp.makeCloud((-wd/2,-wd/2,-.5*cylHt),(wd/2,wd/2,.5*cylHt),rMean,0,int(nSpheres),False)
sp.rotate((1,0,0),-pi/4)
O.bodies.append([sphere(s[0],s[1]) for s in sp])
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()],
),
RotationEngine(rotateAroundZero=True,zeroPoint=(0,0,0),rotationAxis=(0,1,1),angularVelocity=30*(2*pi/60),ids=cylIds,label='rotor'),
NewtonIntegrator(damping=.3,gravity=(0,0,-1e3)), # gravity artificially high, to make it faster going ;-)
]
O.dt=PWaveTimeStep()
O.stopAtIter=int(2*pi/(rotor.angularVelocity*O.dt))
O.timingEnabled=True; timing.reset()
from yade import qt
qt.Controller()
qt.View()
