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[Fu zuoguang <question226352@xxxxxxxxxxxxxxxxxxxxx>]

New question #226352 on Yade:
https://answers.launchpad.net/yade/+question/226352

Dear Jan Stránský:
     Thanks for helping me to finish this task and I can accomplish all the process of 2D biaxial compression simulation, from preprocessing to postprocessing, using this script that is shown as follows for others to reference.

### fundamental details of application ###
# unicode: UTF-8 
Filename='2D-simulation'
from yade import pack,os
################################# preprocessing for simulation ##########################################  
### prescribing variables and functions for simulation controller ###
# material defination
spheremat = O.materials.append(ViscElMat(kn=4e6,ks=4e6,cn=.0,cs=.0,density=1500,frictionAngle=25.565))
wallmat = O.materials.append(ViscElMat(kn=1e8,ks=1e8,cn=.0,cs=.0,density=2600,frictionAngle=25.565))
# walls defination
mn,mx=Vector3(0,0,0),Vector3(7,7,1)
wallIds=O.bodies.append(utils.aabbWalls([mn,mx],thickness=.01,material=wallmat))
# ThreeDTriaxialEngine defination for initial-state determination(the first calculation step)
triax01=ThreeDTriaxialEngine(
	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],
	wall_front_activated = False,wall_back_activated = False,
	internalCompaction=False, 
	stressControl_1 = True, stressControl_2 = True,stressControl_3 = True,
	computeStressStrainInterval =10,
	sigma_iso = 1.25e5,
	sigma1 = 1.25e5,
	sigma2 = 1.25e5,
	sigma3 = 1.25e5,
	strainRate1 = 0.01,strainRate2 = 0.01,
)
# ThreeDTriaxialEngine defination for biaxial compression(the second calculation step)
triax02=ThreeDTriaxialEngine(
	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],
	wall_front_activated = False,wall_back_activated = False,
	internalCompaction=False, 
	stressControl_1 = True, stressControl_2 = False,stressControl_3 = True,
	computeStressStrainInterval =10,
	sigma_iso = 1.25e5,
	sigma1 = 1.25e5,
	sigma2 = 1.25e5,
#	sigma3 = 1.25e5,
	strainRate1 = 0.001,strainRate2 = 0.15,
)
# Simulation stop conditions defination 
def checkUnbalanced():
    unb=unbalancedForce()
    meanS=(triax01.stress(triax01.wall_right_id)[0]+triax01.stress(triax01.wall_top_id)[1])/2
    q=unb
    r=abs(meanS-triax01.sigma_iso)/triax01.sigma_iso
    if q<0.01 and r<1e-5:
       O.pause()
       O.save('first-step.xml'.format(Filename))
################################# control flow for simulation ##########################################  
# particles generation
O.periodic=1
O.cell.setBox(7,7,7)
sp=pack.SpherePack()
sp.makeCloud((0,0,.5),(7,7,.5),rMean=-1,rRelFuzz=0,num=800,periodic=True)
sp.toSimulation(material=spheremat)
# determining colors for particles in different aeras of the cell
for b in O.bodies:
    if isinstance(b.shape,Sphere):
         pos = b.state.pos
         if pos[0] <3.5 and pos[1] < 3.5: b.shape.color = (1,0,0)       # area 1
         elif pos[0] >= 3.5 and pos[1] <3.5: b.shape.color = (0,1,0)    # area 2
         elif pos[0] >= 3.5 and pos[1] >= 3.5: b.shape.color = (0,0,1)  # area 3
         else: b.shape.pos = (1,1,0)                                    # area 4
O.periodic=0
# blockedDOFs
for b in O.bodies:
	if isinstance(b.shape,Sphere):
		 b.state.blockedDOFs='zXY'
# Simulation assembly for the first step
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb(),Bo1_Wall_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
		[Ip2_ViscElMat_ViscElMat_ViscElPhys()],
		[Law2_ScGeom_ViscElPhys_Basic()]
	),
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	triax01,
	NewtonIntegrator(damping=.1),
	PyRunner(command='checkUnbalanced()',iterPeriod=200)
]
# first step of simulation startting with a correct inheriting for the next step
O.dt = 2e-4
O.run(); O.wait()
# loading inheriting
O.load('first-step.xml')
# Simulation assembly for the second step
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb(),Bo1_Wall_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
		[Ip2_ViscElMat_ViscElMat_ViscElPhys()],
		[Law2_ScGeom_ViscElPhys_Basic()]
	),
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	triax02,
	NewtonIntegrator(damping=.1),
]
# second step of simulation startting 
O.dt = 2e-4
O.run(20000,True);
# whole task over
O.save('final-step.xml'.format(Filename));
O.wait()
################################## postprocessing for simulation ######################################################
f = file("/home/fzg/fu/result.dat",'w')
f.write('# This is the result data of 2D simulation\n\n')
f.write('# There are 8 types of varibles in this data as follows:\n\n')
f.write("varibles='X-cordinate','Y-cordinate','Z-cordinate','Radius','X-displacement','Y-displacement','Z-displacement','Ids'\n\n")
f.write('%-16s %-16s %-16s %-16s %-16s %-16s %-16s %-16s\n'% ('X-cordinate','Y-cordinate','Z-cordinate','Radius','X-displacement','Y-displacement','Z-displacement','Ids'))
for b in O.bodies:
    if isinstance(b.shape,Sphere):
       pos = b.state.pos
       rad = b.shape.radius
       displ = b.state.displ()
       f.write('%-16g %-16g %-16g %-16g %-16g %-16g %-16g %-16d\n'%(pos[0],pos[1],pos[2],rad,displ[0],displ[1],displ[2],b.id))
f.write('################################ ends ##########################################')
f.close()
def rename():
    global Filename
    os.rename("/home/fzg/fu/result.dat","/home/fzg/fu/{0}.plt".format(Filename))
rename()

After this script showing, I have two problems to ask you as that:
(1). This script can almost do all the things the simulation need to do except the ermining colors for particles in different aeras of the cell"

 

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