New question #706748 on Yade: https://answers.launchpad.net/yade/+question/706748
Hello, I'm trying to calculate some data from my YADE Marshall Mix Design. I want to get value such as Bulk Volume, Bulk Density, VMA, % Air Void. But the result that I get seem to be negative and incorrect. So, I am confuse on my calculation part whether I set something wrong or my formula is inccorect? ##The Following is my Code## import random import math from yade import geom, pack, utils, plot, ymport import pandas as pd # Define material properties youngModulus = 1e7 poissonRatio = 0.25 density = 2700 frictionAngle =0.7 # Create material material = O.materials.append(FrictMat(young=youngModulus, poisson=poissonRatio, density=density)) material1 = O.materials.append(FrictMat(young=youngModulus, poisson=poissonRatio, density=density, frictionAngle=frictionAngle)) # Define cylinder with funnel parameters center = (0, 0, 0) diameter = 0.102 height = 0.18 # create cylindrical body with radius 0.102 m and height 0.064 m cylinder = geom.facetCylinder(center=center, radius=diameter/2, height=height, segmentsNumber=80, wallMask=6) # assign material to each body in the cylinder for body in cylinder: body.bodyMat = material # add cylinder to simulation O.bodies.append(cylinder) # Define cylinder with funnel parameters center1 = (0,0,height/2) dBunker = 0.4 dOutput = 0.102 hBunker = 0 hOutput = 0.15 hPipe = 0 # create funnel as a bunker with diameter 0.102 m, height 0.064 m funnel = geom.facetBunker(center=center1, dBunker=dBunker, dOutput=dOutput, hBunker=hBunker,hOutput=hOutput, hPipe=hPipe, segmentsNumber=80, wallMask=4) # assign material to each body in the funnel for body in funnel: body.bodyMat = material # add funnel to simulation O.bodies.append(funnel) # define sphere parameters and number of spheres rMean1 = (0.0125+0.019)/4 rRelFuzz1 = (0.019-0.0125)/4/rMean1 num1 = 13 rMean2 = (0.0095+0.0125)/4 rRelFuzz2 = (0.0125-0.0095)/4/rMean2 num2 = 51 rMean3 = (0.00475+0.0095)/4 rRelFuzz3 = (0.0095-0.00475)/4/rMean3 num3 = 563 rMean4 = (0.00236+0.00475)/4 rRelFuzz4 = (0.00475-0.00236)/4/rMean4 num4 = 5101 rMean5 = (0.00118+0.00236)/4 rRelFuzz5 = (0.00236-0.00118)/4/rMean4 num5 = 18369 #create empty sphere packing sp = pack.SpherePack() # generate randomly sphere sp.makeCloud((-dBunker/4,-dBunker/4,1.3*height),(dBunker/4,dBunker/4,2*height), rMean = rMean1, rRelFuzz = rRelFuzz1, num = num1) sp.makeCloud((-dBunker/4,-dBunker/4,1.3*height),(dBunker/4,dBunker/4,2*height), rMean = rMean2, rRelFuzz = rRelFuzz2, num = num2) sp.makeCloud((-dBunker/4,-dBunker/4,1.3*height),(dBunker/4,dBunker/4,2*height), rMean = rMean3, rRelFuzz = rRelFuzz3, num = num3) sp.makeCloud((-dBunker/4,-dBunker/4,1.3*height),(dBunker/4,dBunker/4,2*height), rMean = rMean4, rRelFuzz = rRelFuzz4, num = num4) sp.makeCloud((-dBunker/4,-dBunker/4,1.3*height),(dBunker/4,dBunker/4,2*height), rMean = rMean5, rRelFuzz = rRelFuzz5, num = num5) # add the sphere pack to the simulation sp.toSimulation(material = material1) for body in O.bodies: if not isinstance(body.shape, Sphere): continue if body.shape.radius >= rMean1 : body.shape.color = (0,0,1) #blue if body.shape.radius <= rMean1 and body.shape.radius > rMean2: body.shape.color = (0,0,1) #blue if body.shape.radius <= rMean2 and body.shape.radius > rMean3: body.shape.color = (1,0,0) #red if body.shape.radius <= rMean3 and body.shape.radius > rMean4: body.shape.color = (0,1,0) #green if body.shape.radius <= rMean4 and body.shape.radius > rMean5: body.shape.color = (1,1,0) #yellow if body.shape.radius <= rMean5 : body.shape.color = (1,0,1) #magenta O.engines = [ ForceResetter(), # sphere, facet, wall InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb(), Bo1_Wall_Aabb()]), InteractionLoop( # the loading plate is a wall, we need to handle sphere+sphere, sphere+facet, sphere+wall [Ig2_Sphere_Sphere_ScGeom(), Ig2_Facet_Sphere_ScGeom(), Ig2_Wall_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), NewtonIntegrator(gravity=(0, 0, -1000), damping=0.3), # the label creates an automatic variable referring to this engine # we use it below to change its attributes from the functions called PyRunner(command='checkUnbalanced()', realPeriod=2, label='checker'), ] O.dt = PWaveTimeStep() # enable energy tracking; any simulation parts supporting it # can create and update arbitrary energy types, which can be # accessed as O.energy['energyName'] subsequently O.trackEnergy = True # the following checkUnbalanced, unloadPlate and stopUnloading functions are all called by the 'checker' # (the last engine) one after another; this sequence defines progression of different stages of the # simulation, as each of the functions, when the condition is satisfied, updates 'checker' to call # the next function when it is run from within the simulation next time # check whether the gravity deposition has already finished # if so, add wall on the top of the packing and start the oedometric test def checkUnbalanced(): # at the very start, unbalanced force can be low as there is only few contacts, but it does not mean the packing is stable if O.iter < 25000: return # add plate at the position on the top of the packing # the maximum finds the z-coordinate of the top of the topmost particle O.bodies.append(wall(max([b.state.pos[2] + b.shape.radius for b in O.bodies if isinstance(b.shape, Sphere)]), axis=2, sense=-1)) global plate # without this line, the plate variable would only exist inside this function plate = O.bodies[-1] # the last particles is the plate # Wall objects are "fixed" by default, i.e. not subject to forces # prescribing a velocity will therefore make it move at constant velocity (downwards) plate.state.vel = (0, 0, -0.8) # start plotting the data now, it was not interesting before O.engines = O.engines + [PyRunner(command='addPlotData()', iterPeriod=200)] # next time, do not call this function anymore, but the next one (unloadPlate) instead checker.command = 'unloadPlate()' def unloadPlate(): # if the force on plate exceeds maximum load, start unloading if abs(O.forces.f(plate.id)[2]) > 1e3: plate.state.vel *= -0.8 # next time, do not call this function anymore, but the next one (stopUnloading) instead checker.command = 'stopUnloading()' def stopUnloading(): if abs(O.forces.f(plate.id)[2]) < 1e2: # calculate the volume of the packing volume_packing = 0 num_spheres = 0 for b in O.bodies: if isinstance(b.shape, yade.wrapper.Sphere): volume_packing += 4/3 * math.pi * b.shape.radius**3 num_spheres += 1 # print the number of spheres and volume of packking print("Number of spheres:", "{:d}".format(num_spheres)) print("V Packing:", "{:e}".format(volume_packing)) # print the height of the plate top = abs(plate.state.pos[2] + height/2) print("Plate height:", top) # calculate the volume of the cylinder new_volume_cylinder = math.pi * (diameter/2)**2 * top print("V Cylinder:", "{:e}".format(new_volume_cylinder)) # calculate bulk volume new_bulk_volume = (new_volume_cylinder - volume_packing) print("Bulk Volume:", "{:e}".format(new_bulk_volume)) # calculate bulk density new_bulk_density = (density * volume_packing) / new_bulk_volume print("Bulk Density:", "{:.2f}".format(new_bulk_density)) # calculate VMA new_vma = (new_bulk_volume - volume_packing) * 100 print("VMA:", "{:.2f}%".format(new_vma)) # calculate % air void new_air_void = ((new_bulk_volume -volume_packing)/new_bulk_volume)*100 print("Air Void:", "{:.2f}%".format(new_air_void)) # calculate the porosity and porosity percentage new_porosity = (new_volume_cylinder - volume_packing) / new_volume_cylinder new_porosity_percent = new_porosity * 100 print("Porosity:", "{:.2f}".format(new_porosity)) print("Porosity:", "{:.2f}%".format(new_porosity_percent)) # O.tags can be used to retrieve unique identifiers of the simulation # if running in batch, subsequent simulation would overwrite each other's output files otherwise # d (or description) is simulation description (composed of parameter values) # while the id is composed of time and process number plot.saveDataTxt(O.tags['d.id'] + '.txt') O.pause() def addPlotData(): if not isinstance(O.bodies[-1].shape, Wall): plot.addData() return Fz = O.forces.f(plate.id)[2] plot.addData(Fz=Fz, w=plate.state.pos[2] - plate.state.refPos[2], unbalanced=unbalancedForce(), i=O.iter) # besides unbalanced force evolution, also plot the displacement-force diagram plot.plots = {'i': ('unbalanced',), 'w': ('Fz',)} plot.plot() -- 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