Question #686179 on Yade changed:
https://answers.launchpad.net/yade/+question/686179
Status: Answered => Open
Leonard is still having a problem:
Hi Robert,
Many thanks for your reply.
>Depends on what you want to simulate.
What I want to simulate is the common PSD curve for a soil. For a general
particle size distribution curve of soil, the Y-axis is percentage passing by
mass, the x-axis is particle size (diameter) based on what I understand.
What I am confused is whether the distributeMass command controls on Y-axis or
on X-axis?
For example, if distributeMass command controls on Y-axis, it may mean that
percentage passing by mass (distributeMass=True) or by count
(distributeMass=False)?
If distributeMass command controls on X-axis, it may mean that X-axis is
particle diameter (distributeMass=False) or particle mass (distributeMass=True)?
>spheres using a common multiplier
Thanks, it is clear.
>Maybe they used internalCompaction=False.
I'm still interested in how it is achieved by setting internalCompaction=False.
I have also tried internalCompaction=False, the problem is that when set
internalCompaction=False, the size of the sample changed.
For example, the size of initial packing is 0.7*0.7*1.4
(mn,mx=Vector3(0,0,0),Vector3(0.7,0.7,1.4)), when I set
internalCompaction=True, after compacted state completed, the size of the
packing stays around 0.7*0.7*1.4. However, when I set internalCompaction=False,
after compacted state completed, the size of the packing is changed to
0.26*0.26*0.9, and in this case, I can not obtain a reasonable sample in terms
of size. The following MWE may show this question by changing
internalCompaction= True to False.
###########
from yade import pack, plot
nRead=readParamsFromTable(
num_spheres=1000,
compFricDegree = 30,
key='_triax_base_',
unknownOk=True
)
from yade.params import table
num_spheres=table.num_spheres
key=table.key
targetPorosity = 0.43
compFricDegree = table.compFricDegree
finalFricDegree = 30
rate=-0.02
damp=0.2
stabilityThreshold=0.01
young=5e6
mn,mx=Vector3(0,0,0),Vector3(0.7,0.7,1.4)
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()
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])
Gl1_Sphere.quality=3
### DEFINING ENGINES ###
triax=TriaxialStressController(
maxMultiplier=1.+2e4/young,
finalMaxMultiplier=1.+2e3/young,
thickness = 0,
stressMask = 7,
internalCompaction=True,## please change True to False here to look at
what I say
)
newton=NewtonIntegrator(damping=damp)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
newton
]
Gl1_Sphere.stripes=0
if nRead==0: yade.qt.Controller(), yade.qt.View()
### APPLYING CONFINING PRESSURE ###
triax.goal1=triax.goal2=triax.goal3=-10000
while 1:
O.run(1000, True)
unb=unbalancedForce()
print 'unbalanced force:',unb,' mean stress: ',triax.meanStress
if unb<stabilityThreshold and abs(-10000-triax.meanStress)/10000<0.001:
break
print "### Isotropic state saved ###"
### REACHING A SPECIFIED POROSITY PRECISELY ###
import sys
while triax.porosity>targetPorosity:
# we decrease friction value and apply it to all the bodies and contacts
compFricDegree = 0.95*compFricDegree
setContactFriction(radians(compFricDegree))
print "\r Friction: ",compFricDegree," porosity:",triax.porosity,
sys.stdout.flush()
O.run(500,1)
print "### Compacted state saved ###"
########################
Cheers,
Leonard
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