Question #625502 on Yade changed: https://answers.launchpad.net/yade/+question/625502
Status: Answered => Open Huihuang Xia is still having a problem: Thanks Robert, I added the following function at the bottom of session1 and using PyRunner call this function, but the exported text file contains nothing. Here is my code: # -*- coding: utf-8 -*- from yade import pack from yade import export ############################################ ### DEFINING VARIABLES AND MATERIALS ### ############################################ # The following 5 lines will be used later for batch execution nRead=readParamsFromTable( num_spheres=5000,# number of spheres compFricDegree = 30, # contact friction during the confining phase key='_triax_base_', # put you simulation's name here unknownOk=True ) from yade.params import table num_spheres=table.num_spheres# number of spheres key=table.key targetPorosity = 0.43 #the porosity we want for the packing compFricDegree = table.compFricDegree # initial contact friction during the confining phase (will be decreased during the REFD compaction process) finalFricDegree = 30 # contact friction during the deviatoric loading rate=-0.02 # loading rate (strain rate) damp=0.2 # damping coefficient stabilityThreshold=0.01 # we test unbalancedForce against this value in different loops (see below) young=5e6 # contact stiffness mn,mx=Vector3(0,0,0),Vector3(1,1,1) # corners of the initial packing ## create materials for spheres and plates 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')) ## create walls around the packing walls=aabbWalls([mn,mx],thickness=0,material='walls') wallIds=O.bodies.append(walls) ## use a SpherePack object to generate a random loose particles packing global sp sp=pack.SpherePack() sp.makeCloud(mn,mx,-1,0.3333,num_spheres,False, 0.95,seed=1) #"seed" make the "random" generation always the same sps=O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp]) #or alternatively (higher level function doing exactly the same): #sp.toSimulation(material='spheres') ############################ ### 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()] ), PyRunner(command='stop()',iterPeriod=10), ## 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) 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 def stop(): if O.iter>5000: O.pause() # filter this sp into a sphere pred=pack.inSphere((0.5,0.5,0.5),0.25) assembly=pack.filterSpherePack(pred,sp,True) assembly.toSimulation() # delete the sp bodeisToBeDeleted=[] for i in sps: if i in assembly: continue bodeisToBeDeleted.append(i) for b in bodeisToBeDeleted: O.bodies.erase(b) # export this assembly export.text('assembly.txt') -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp