.. _examples-particlestest3d2: ******************* particlesTest3D2.py ******************* You can view and download this file on Github: `particlesTest3D2.py `_ .. code-block:: python :linenos: #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ # This is an EXUDYN example # # Details: test with parallel computation and particles # # Author: Johannes Gerstmayr # Date: 2021-11-01 # # Copyright:This file is part of Exudyn. Exudyn is free software. You can redistribute it and/or modify it under the terms of the Exudyn license. See 'LICENSE.txt' for more details. # #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ import exudyn as exu from exudyn.itemInterface import * from exudyn.utilities import * #includes itemInterface and rigidBodyUtilities import exudyn.graphics as graphics #only import if it does not conflict from exudyn.graphicsDataUtilities import * import numpy as np SC = exu.SystemContainer() mbs = SC.AddSystem() #create an environment for mini example nGround = mbs.AddNode(NodePointGround(referenceCoordinates=[0,0,0])) #mLast = mbs.AddMarker(MarkerNodePosition(nodeNumber=nGround)) np.random.seed(1) #always get same results useGraphics = True L = 1 n = 50000 a = 0.2*L*0.5*10*0.5 radius = 0.5*a m = 0.05 k = 8e4*2 #4e3 needs h=1e-4 d = 0.001*k*4*0.5*0.2 markerList = [] radiusList = [] gDataList = [] rb = 30*L H = 8*L Hy=3*L pos0 = [0,-rb-0.5*H,0] pos1 = [-rb-H,-Hy,0] pos2 = [ rb+H,-Hy,0] pos3 = [ 0,-Hy,rb+H] pos4 = [ 0,-Hy,-rb-H] posList=[pos0,pos1,pos2,pos3,pos4] for pos in posList: #gDataList += [{'type':'Circle','position':pos,'radius':rb, 'color':graphics.color.grey}] #gDataList += [graphics.Cylinder(pAxis=pos, vAxis=[0,0,0.1], radius=rb, color= graphics.color.grey, nTiles=200)] colBG = graphics.color.grey colBG[3] = 0.05 gDataList += [graphics.Sphere(point=pos, radius=rb, color= colBG, nTiles=100)] #gDataList += [GraphicsDataRectangle(-1.2*H,-H,1.2*H,14*H,color=graphics.color.red)]#80000 particles nMass = mbs.AddNode(NodePointGround(referenceCoordinates=pos, visualization=VNodePointGround(show=False))) #oMass = mbs.AddObject(MassPoint(physicsMass=m, nodeNumber=nMass)) mThis = mbs.AddMarker(MarkerNodePosition(nodeNumber=nMass)) markerList += [mThis] radiusList += [rb] color4node = graphics.color.blue print("start create: number of masses =",n) for i in range(n): kk = int(i/int(n/16)) color4node = graphics.colorList[min(kk%9,9)] if (i%20000 == 0): print("create mass",i) offy = 0 row = 8*2 #160 iy = int(i/(row*row)) ix = i%row iz = int(i/row)%row if iy % 2 == 1: ix+=0.5 iz+=0.5 offy = -0.25*H-3.5*a+iy*a*0.74 #0.70x is limit value! offx = -0.6*a-H*0.5 + (ix+1)*a offz = -0.6*a-H*0.5 + (iz+1)*a valueRand = np.random.random(1)[0] rFact = 0.2 #random part gRad = radius*(1-rFact+rFact*valueRand) nMass = mbs.AddNode(NodePoint(referenceCoordinates=[offx,offy,offz], initialVelocities=[0,-20,0], visualization=VNodePoint(show=True,drawSize=2*gRad, color=color4node))) oMass = mbs.AddObject(MassPoint(physicsMass=m, nodeNumber=nMass, #visualization=VMassPoint(graphicsData=[gSphere,gSphere2]) # visualization=VMassPoint(graphicsData=gData) )) mThis = mbs.AddMarker(MarkerNodePosition(nodeNumber=nMass)) mbs.AddLoad(Force(markerNumber=mThis, loadVector= [0,-m*9.81,0])) markerList += [mThis] radiusList += [gRad] mLast = mThis print("finish create") #put here, such that it is transparent in background oGround=mbs.AddObject(ObjectGround(referencePosition= [0,0,0], visualization=VObjectGround(graphicsData=gDataList))) if True: gContact = mbs.AddGeneralContact() gContact.verboseMode = 1 for i in range(len(markerList)): m = markerList[i] r = radiusList[i] gContact.AddSphereWithMarker(m, radius=r, contactStiffness=k, contactDamping=d, frictionMaterialIndex=0) # f=n/32000 ssx = 20 #search tree size #ssy = int(500*f) #search tree size ssy = 200 # mbs.Assemble() # gContact.FinalizeContact(mbs, searchTreeSize=np.array([ssx,ssy,ssx]), frictionPairingsInit=np.eye(1), # searchTreeBoxMin=np.array([-1.2*H,-H,-1.2*H]), searchTreeBoxMax=np.array([1.2*H,14*H,1.2*H]) #80000 particles # ) gContact.SetFrictionPairings(np.eye(1)) gContact.SetSearchTreeCellSize(numberOfCells=[ssx,ssy,ssx]) gContact.SetSearchTreeBox(pMin=np.array([-1.2*H,-H,-1.2*H]), pMax=np.array([1.2*H,14*H,1.2*H])) print('treesize=',ssx*ssx*ssy) mbs.Assemble() print("finish gContact") tEnd = 10 h= 0.0001*0.25 simulationSettings = exu.SimulationSettings() simulationSettings.linearSolverType = exu.LinearSolverType.EigenSparse #simulationSettings.solutionSettings.writeSolutionToFile = True simulationSettings.solutionSettings.writeSolutionToFile = True simulationSettings.solutionSettings.solutionWritePeriod = 0.02 simulationSettings.solutionSettings.outputPrecision = 5 #make files smaller simulationSettings.solutionSettings.exportAccelerations = False simulationSettings.solutionSettings.exportVelocities = False simulationSettings.solutionSettings.coordinatesSolutionFileName = 'solution/test.txt' simulationSettings.displayComputationTime = True #simulationSettings.displayStatistics = True simulationSettings.timeIntegration.verboseMode = 1 simulationSettings.parallel.numberOfThreads = 4 simulationSettings.timeIntegration.newton.numericalDifferentiation.forODE2 = False simulationSettings.timeIntegration.newton.useModifiedNewton = False SC.visualizationSettings.general.graphicsUpdateInterval=0.5 SC.visualizationSettings.general.circleTiling=200 SC.visualizationSettings.general.drawCoordinateSystem=False SC.visualizationSettings.loads.show=False SC.visualizationSettings.bodies.show=True SC.visualizationSettings.markers.show=False SC.visualizationSettings.nodes.show=True SC.visualizationSettings.nodes.drawNodesAsPoint = False SC.visualizationSettings.nodes.defaultSize = 0 #must not be -1, otherwise uses autocomputed size SC.visualizationSettings.nodes.tiling = 4 SC.visualizationSettings.window.renderWindowSize=[1200,1200] #SC.visualizationSettings.window.renderWindowSize=[1024,1400] SC.visualizationSettings.openGL.multiSampling = 4 #improved OpenGL rendering SC.visualizationSettings.exportImages.saveImageFileName = "animation/frame" SC.visualizationSettings.exportImages.saveImageTimeOut=10000 #5000 is too shot sometimes! if False: simulationSettings.solutionSettings.recordImagesInterval = 0.025 SC.visualizationSettings.general.graphicsUpdateInterval=2 simulate=True if simulate: if useGraphics: SC.visualizationSettings.general.autoFitScene = False exu.StartRenderer() if 'renderState' in exu.sys: SC.SetRenderState(exu.sys['renderState']) mbs.WaitForUserToContinue() #initial gContact statistics #simulationSettings.timeIntegration.numberOfSteps = 1 #simulationSettings.timeIntegration.endTime = h #mbs.SolveDynamic(simulationSettings, solverType=exu.DynamicSolverType.ExplicitEuler) #print(gContact) simulationSettings.timeIntegration.numberOfSteps = int(tEnd/h) simulationSettings.timeIntegration.endTime = tEnd simulationSettings.timeIntegration.explicitIntegration.computeEndOfStepAccelerations = False #increase performance, accelerations less accurate mbs.SolveDynamic(simulationSettings, solverType=exu.DynamicSolverType.ExplicitEuler) #print(gContact) #p = mbs.GetNodeOutput(n, variableType=exu.OutputVariableType.Position) #print("pEnd =", p[0], p[1]) #print(gContact) if useGraphics: SC.WaitForRenderEngineStopFlag() exu.StopRenderer() #safely close rendering window! else: SC.visualizationSettings.general.autoFitScene = False SC.visualizationSettings.general.graphicsUpdateInterval=0.5 print('load solution file') sol = LoadSolutionFile('particles3Db.txt', safeMode=True) #sol = LoadSolutionFile('coordinatesSolution2.txt') print('start SolutionViewer') mbs.SolutionViewer(sol)