Question #669048 on Yade changed:
https://answers.launchpad.net/yade/+question/669048
SayedHessam posted a new comment:
Dear Robert,
Sorry for the lack of information.
BTW, you can find herewith my script, as you requested:
############################
### DEFINING ENGINES ###
############################
triax=TriaxialStressController(
## TriaxialStressController will be used to control stress and strain.
It controls particles size and plates positions.
## this control of boundary conditions was used for instance in
http://dx.doi.org/10.1016/j.ijengsci.2008.07.002
maxMultiplier=1.+2e4/young, # spheres growing factor (fast growth)
finalMaxMultiplier=1.+2e3/young, # spheres growing factor (slow growth)
thickness = 0,
## switch stress/strain control using a bitmask. What is a bitmask,
huh?!
## Say x=1 if stess is controlled on x, else x=0. Same for for y and z,
which are 1 or 0.
## Then an integer uniquely defining the combination of all these tests
is: mask = x*1 + y*2 + z*4
## to put it differently, the mask is the integer whose binary
representation is xyz, i.e.
## "100" (1) means "x", "110" (3) means "x and y", "111" (7) means "x
and y and z", etc.
stressMask = 7,
internalCompaction=True, # If true the confining pressure is generated
by growing particles
)
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()]
),
## We will use the global stiffness of each body to determine an
optimal timestep (see
https://yade-dem.org/w/images/1/1b/Chareyre&Villard2005_licensed.pdf)
FlowEngine(dead=1,label="flow"),#introduced as a dead engine for the
moment, see 2nd section
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
TriaxialStateRecorder(iterPeriod=100,file='WallStresses'+table.key),
newton
]
#Display spheres with 2 colors for seeing rotations better
Gl1_Sphere.stripes=0
if nRead==0: yade.qt.Controller(), yade.qt.View()
## UNCOMMENT THE FOLLOWING SECTIONS ONE BY ONE
## DEPENDING ON YOUR EDITOR, IT COULD BE DONE
## BY SELECTING THE CODE BLOCKS BETWEEN THE SUBTITLES
## AND PRESSING CTRL+SHIFT+D
#######################################
### APPLYING CONFINING PRESSURE ###
#######################################
#the value of (isotropic) confining stress defines the target stress to be
applied in all three directions
triax.goal1=triax.goal2=triax.goal3=-10000
while 1:
O.run(1000, True)
#the global unbalanced force on dynamic bodies, thus excluding boundaries,
which are not at equilibrium
unb=unbalancedForce()
print 'unbalanced force:',unb,' mean stress: ',triax.meanStress
if unb<stabilityThreshold and abs(-10000-triax.meanStress)/10000<0.001:
break
O.save('confinedState'+key+'.yade.gz')
print "### Isotropic state saved ###"
print triax.porosity
print triax.meanStress
print len(O.bodies)
#####################################################
### Example of how to record and plot data ###
#####################################################
from yade import plot
## a function saving variables
def history():
plot.addData(unbalanced=unbalancedForce(),e11=-triax.strain[0],
e22=-triax.strain[1], e33=-triax.strain[2],
ev=-triax.strain[0]-triax.strain[1]-triax.strain[2],
s11=-triax.stress(triax.wall_right_id)[0],
s22=-triax.stress(triax.wall_top_id)[1],
s33=-triax.stress(triax.wall_front_id)[2],
devi = -triax.stress(triax.wall_top_id)[1] -
(-triax.stress(triax.wall_right_id)[0]-triax.stress(triax.wall_front_id)[2]) /
2.0,
p = triax.meanStress,
i=O.iter)
if 1:
# include a periodic engine calling that function in the simulation loop
O.engines=O.engines[0:5]+[PyRunner(iterPeriod=20,command='history()',label='recorder')]+O.engines[5:7]
#O.engines.insert(4,PyRunner(iterPeriod=20,command='history()',label='recorder'))
else:
# With the line above, we are recording some variables twice. We could in
fact replace the previous
# TriaxialRecorder
# by our periodic engine. Uncomment the following line:
O.engines[4]=PyRunner(iterPeriod=20,command='history()',label='recorder')
O.run(100,True)
## declare what is to plot. "None" is for separating y and y2 axis
plot.plots={'i':('e11','e22','e33',None,'s11','s22','s33')}
## the traditional triaxial curves would be more like this:
#plot.plots={'e22':('s11','s22','s33',None,'ev')}
# display on the screen (doesn't work on VMware image it seems)
plot.plot()
devi_test = -triax.stress(triax.wall_top_id)[1] -
(-triax.stress(triax.wall_right_id)[0]-triax.stress(triax.wall_front_id)[2])
/ 2.0
def stress_control1():
global devi_test
while devi_test < 50000:
O.run(100)
devi_test = -triax.stress(triax.wall_top_id)[1] -
(-triax.stress(triax.wall_right_id)[0]\
-triax.stress(triax.wall_front_id)[2]) / 2.0
def stress_control2():
global devi_test
while devi_test > -50000:
O.run(100)
devi_test = -triax.stress(triax.wall_top_id)[1] -
(-triax.stress(triax.wall_right_id)[0]\
-triax.stress(triax.wall_front_id)[2]) / 2.0
#B. Activate flow engine and set boundary conditions in order to get
permeability
flow.dead=0
flow.defTolerance=0.3
flow.meshUpdateInterval=200
flow.useSolver=3
flow.permeabilityFactor=1
flow.viscosity=1.3e-3
flow.fluidBulkModulus = 2e9
flow.imposePressure(Vector3(triax.width/2,triax.height/2,triax.depth/2),0.001)
flow.bndCondIsPressure=[0,0,0,0,0,0]
flow.bndCondValue=[0,0,0,0,0,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
O.dt=0.1e-3
O.dynDt=False
O.run(1,1)
Qin = flow.getBoundaryFlux(2)
Qout = flow.getBoundaryFlux(3)
tic_toc = 0
print(O.iter)
print(triax.stressMask)
print(triax.goal1)
print(triax.goal2)
print(triax.goal3)
Regards
Sam
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