New question #456869 on Yade:
https://answers.launchpad.net/yade/+question/456869
Hi
Sorry i asked this question earlier, but i need some clarification regarding
the results i am getting.
I am trying to isotropically compress a packing with capillarity with sigmaIso
being 10e06 Pa. When i am varying my Capillary pressure viz., 200, 1500 and
10000 kPa, i am still getting same response in terms of void ration and mean
stress. Is it because of water being in pendular regime or i am doing something
wrong.
My script:
# generate loose packing
from yade import pack, qt, plot
#some parameters:
young_modulus=5e6
friction = 0.5
angle = atan(friction)
local_damping = 0.01
viscous_normal = 0.021
viscous_shear = 0.8*viscous_normal
mn = Vector3(0,0,0)
mx = Vector3(.05,.05,.05)
#key ='_triax_base_',
#creating a material (FrictMat):
O.materials.append(FrictMat(young=young_modulus,poisson=0.5,frictionAngle=angle,density=2600,label='spheres'))
#SphereMat=O.materials[id_SphereMat]
O.materials.append(FrictMat(young=young_modulus,poisson=0.5,frictionAngle=0,density=0,label='walls'))
#generate boundary:
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
#generate particles:
sp=pack.SpherePack()
sp.makeCloud(mn,mx,.001,rRelFuzz=.3,seed=1)
O.bodies.append([sphere(c,r,material='spheres') for c,r in sp])
triax=TriaxialStressController(thickness = 0,
stressMask = 7,
internalCompaction=False, # If true the
confining pressure is generated by growing particles
goal1=-1e06,
goal2=-1e06,
goal3=-1e06,
max_vel=0.01,
)
#define engines:
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_CapillaryPhys()], #for
linear model only
[Law2_ScGeom_FrictPhys_CundallStrack()], #for
linear model only
),
Law2_ScGeom_CapillaryPhys_Capillarity(capillaryPressure=10000),#for linear
model only
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
TriaxialStateRecorder(iterPeriod=100,file='Porosity_10000.txt'),
NewtonIntegrator(damping=local_damping),
PyRunner(command='addPlotData()',iterPeriod=100)
]
def addPlotData():
plot.addData(
i=O.iter,
s11=-triax.stress(triax.wall_right_id)[0],s22=-triax.stress(triax.wall_top_id)[1],s33=-triax.stress(triax.wall_front_id)[2],
e11=-triax.strain[0],e22=-triax.strain[1],e33=-triax.strain[2],
poro=utils.porosity(), stress=-triax.meanStress,
)
#set time step and run simulation:
O.dt=0.5*PWaveTimeStep()
plot.plots={'i ':('s11','s22','s33'),' i':('e11','e22','e33'),
'stress':('poro')}
#show the plot
plot.plot()
#save the plot
#plot.saveDataTxt('Porosity_1.txt',vars=('i','s11','s22','s33','e11','e22','e33','poro','stress'))
from yade import qt
qt.View()
print('Press PLAY button')
Thanks...
Amiya
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