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[Fu zuoguang <question295521@xxxxxxxxxxxxxxxxxxxxx>]

Question #295521 on Yade changed:
https://answers.launchpad.net/yade/+question/295521

Fu zuoguang gave more information on the question:
# encoding: utf-8
# the script demonstrates a simple case of triaxial simulation using TriaxialCompressionEngine. More elaborated examples can be found in the triax-tutorial folder
from yade import pack

sp=pack.SpherePack()
## corners of the initial packing
mn,mx=Vector3(0,0,0.5),Vector3(1,1,0.5)

## box between mn and mx, avg radius ± ½(20%), 2k spheres
sp.makeCloud(minCorner=mn,maxCorner=mx,rRelFuzz=.2,num=2000)

## create material #0, which will be used as default
O.materials.append(FrictMat(young=15e7,poisson=.4,frictionAngle=radians(30),density=2600,label='spheres'))
O.materials.append(FrictMat(young=15e7,poisson=.4,frictionAngle=0,density=0,label='frictionless'))

## copy spheres from the packing into the scene
## use default material, don't care about that for now
O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp])

## create walls around the packing
walls=aabbWalls(thickness=1e-10,material='frictionless')
wallIds=O.bodies.append(walls)

# block the dof in z-direction.
for b in O.bodies:
	if isinstance(b.shape, Sphere):b.state.blockedDOFs = 'zXY'

# define the engine.
triax=TriaxialStressController(
    wall_bottom_id=wallIds[2],wall_top_id=wallIds[3],wall_left_id=wallIds[0],
	wall_right_id=wallIds[1],wall_back_id=wallIds[4],wall_front_id=wallIds[5],

    # keep all the walls from moving except the back and front walls.
    wall_back_activated = 0, wall_front_activated = 0,
    thickness = 1e-9, internalCompaction = 0,
    
    # stress controlling condition.
    stressMask = 7,
        goal1 = -100000,goal2 = -100000,goal3 = -0.0,
        
	label="triax", )

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,
	# you can add TriaxialStateRecorder and such here…
	NewtonIntegrator(damping=.4)
]

# run this simulation.
O.run(200000, True)
##################################  running simulation process is over!

# record all the contact normals in the final state.
contact_normal_list=[[i.geom.normal[0],i.geom.normal[1]] for i in O.interactions]

# divide the whole Cartesian system into 4 quadrants as: (1)x>0 and y>0; (2)x<0 and y>0 ...
# then summarize respectively the number of contact normals located in each area with
# ignoring cursoryly the sphere-wall contacts.

quadrant_1_num, quadrant_2_num, quadrant_3_num, quadrant_4_num, =0, 0,
0, 0

for i in xrange(len(contact_normal_list)):
    if (contact_normal_list[i][0]>0 and contact_normal_list[i][1]>0): quadrant_1_num=quadrant_1_num+1
    if (contact_normal_list[i][0]<0 and contact_normal_list[i][1]>0): quadrant_2_num=quadrant_2_num+1
    if (contact_normal_list[i][0]<0 and contact_normal_list[i][1]<0): quadrant_3_num=quadrant_3_num+1
    if (contact_normal_list[i][0]>0 and contact_normal_list[i][1]<0): quadrant_4_num=quadrant_4_num+1
    else:pass
  
print 'the total number of contacts is: ', len(contact_normal_list)
print 'the number of sphere-sphere contacts is: ',(quadrant_1_num+quadrant_2_num+quadrant_3_num+quadrant_4_num)
print 'the number of contacts in 1 quadrant is: ', quadrant_1_num
print 'the number of contacts in 2 quadrant is: ', quadrant_2_num
print 'the number of contacts in 3 quadrant is: ', quadrant_3_num
print 'the number of contacts in 4 quadrant is: ', quadrant_4_num

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