New question #688789 on Yade: https://answers.launchpad.net/yade/+question/688789
Hi. I want to try some parameters that come into play at a late time point, like 1.0s. So i save the simulation at 0.9s and then restart it by O.load() method, followed by trying new parameters. I have a roller constructed by facets doing translation and rotation controlled by RotationEngine and TranslationEngine, respectively. The parameter of "ids" in those engines is used to bond the engine to the roller (facets). I use the pickle module to save the roller factets ids into a file during the first run and load these ids again in the restart run. So in the new run, the engines enable to find those roller facets to control. I have checked those ids of facets and they are right. The problem is that the roller can not rotate or translate in the restart run. My MWE is as the following, ( the scenario) https://drive.google.com/file/d/1kQN9ZHgJzktLZQ57nWBMbXDa2joxDzUz/view?usp=sharing ) the first run saves every 0.05s and the restart run loads data at time 0f 0.3s. Because the rotation is active till 0.4s, the roller in the restart run should rotate at the beginning. It's stationary yet. ########## the first run to save at a time point ######## ## #!/usr/bin/python #-*- coding: utf-8 -*- from yade import pack,geom,utils import numpy as np from yade import qt ## material matSph = CohFrictMat(density=8e11, young=193e9, poisson=0.3) Mat = O.materials.append(matSph) ## roller radiusSweeper = 0.3e-3 lengthSweeper = 1.0e-3 numSweeperParts = 20 Sweeper=[] for i in np.linspace(0, 2*pi, num=numSweeperParts, endpoint=True): Sweeper.append(Vector3(radiusSweeper*cos(-i), 0.0, radiusSweeper*sin(-i)+1.3e-3)) SweeperP=[Sweeper, [p+Vector3(0.0,lengthSweeper,0.0) for p in Sweeper]] SweeperPoly = pack.sweptPolylines2gtsSurface(SweeperP, threshold=1e-7) SweeperIDs = O.bodies.append(pack.gtsSurface2Facets(SweeperPoly, wire=False, material=Mat)) ## save roller facets' id for restart ### import pickle fd = open('rollerids.txt', 'wb') pickle.dump(SweeperIDs, fd) fd.close() ## platform O.bodies.append(geom.facetBox((2.0e-3,0.5e-3,0.8e-3),(2.0e-3,0.5e-3,0.2e-3), wallMask=63, wire=False, material=Mat)) ### process parameters velsw = 2.5e-3 ## translation vel angvelsw = -50.0 ## rotation vel t1 = 0.4 ## 0~0.2s, rotation + translation t2 = 0.8 ## 0.2~0.4, translation def change_motion(): if O.time < t1: rotaEngineSw.dead = False transEngineSw.dead = False rotaEngineSw.zeroPoint = (O.time*velsw, 0, 1.30e-3) elif O.time < t2: rotaEngineSw.angularVelocity = 0.0 transEngineSw.velocity = velsw else: transEngineSw.velocity = 0.0 ## save per 0.05s svdt = 0.05 saveTime = 0 def svfun(): global svdt, saveTime if O.time> saveTime: O.save('time-'+str(O.time)[:4]) saveTime += svdt if O.time>1.2: O.pause() O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()], [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()], [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()] ), PyRunner(iterPeriod=100,command='change_motion()'), RotationEngine(dead=True, label='rotaEngineSw', rotateAroundZero=True, zeroPoint=(0,0,1.30e-3), angularVelocity=angvelsw, rotationAxis=[0,1,0], ids=SweeperIDs)+ \ TranslationEngine(dead=True, label='transEngineSw', translationAxis=[1,0,0], velocity=velsw, ids=SweeperIDs), NewtonIntegrator(damping=0.75, exactAsphericalRot=True, gravity=(0,0,-9.81)), PyRunner(iterPeriod=100,command='svfun()'), ] ## particles sp=pack.SpherePack() sp.makeCloud((0.5e-3,0,1.0e-3),(2.0e-3,1e-3,1.4e-3),rMean=40e-6,rRelFuzz=0.5) sp.toSimulation(material=Mat) O.dt = 0.85*utils.PWaveTimeStep() #O.run() ######## the restart run ######## ########################## #!/usr/bin/python #-*- coding: utf-8 -*- from yade import pack,geom,utils import numpy as np from yade import qt ## load a saved data O.load('time-0.30') import pickle fd = open('rollerids.txt', 'rb') SweeperIDs = pickle.load(fd) fd.close() ### process parameters velsw = 2.5e-3 ## translation vel angvelsw = -50.0 ## rotation vel t1 = 0.4 ## 0~0.2s, rotation + translation t2 = 0.8 ## 0.2~0.4, translation def change_motion(): if O.time < t1: rotaEngineSw.dead = False transEngineSw.dead = False rotaEngineSw.zeroPoint = (O.time*velsw, 0, 1.30e-3) elif O.time < t2: rotaEngineSw.angularVelocity = 0.0 transEngineSw.velocity = velsw else: transEngineSw.velocity = 0.0 ## save per 0.05s svdt = 0.05 saveTime = 0 def svfun(): global svdt, saveTime if O.time>saveTime: O.save('time-r-'+str(O.time)[:4]) saveTime += svdt if O.time>1.2: O.pause() O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom6D()], [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()], [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()] ), PyRunner(iterPeriod=100,command='change_motion()'), RotationEngine(dead=True, label='rotaEngineSw', rotateAroundZero=True, zeroPoint=(0,0,1.30e-3), angularVelocity=angvelsw, rotationAxis=[0,1,0], ids=SweeperIDs)+ \ TranslationEngine(dead=True, label='transEngineSw', translationAxis=[1,0,0], velocity=velsw, ids=SweeperIDs), NewtonIntegrator(damping=0.75, exactAsphericalRot=True, gravity=(0,0,-9.81)), PyRunner(iterPeriod=100,command='svfun()'), ] O.dt = 0.85*utils.PWaveTimeStep() #O.run() #### code finishing ### Thanks! -- 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 : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
