Re: [Yade-users] [Question #686179]: How to use PSD
Question #686179 on Yade changed: https://answers.launchpad.net/yade/+question/686179 Status: Answered => Solved Leonard confirmed that the question is solved: Thanks Robert, this solved my problem, and I will open a new question about my last doubt. Cheers, Leonard -- 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
Re: [Yade-users] [Question #686179]: How to use PSD
Question #686179 on Yade changed: https://answers.launchpad.net/yade/+question/686179 Status: Open => Answered Robert Caulk proposed the following answer: distributeMass=True ensures your PSD is mass percent passing instead of particle count percent passing. -- 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
Re: [Yade-users] [Question #686179]: How to use PSD
Question #686179 on Yade changed: https://answers.launchpad.net/yade/+question/686179 Status: Answered => Open Leonard is still having a problem: Hi Robert, Many thanks for your reply. >Depends on what you want to simulate. What I want to simulate is the common PSD curve for a soil. For a general particle size distribution curve of soil, the Y-axis is percentage passing by mass, the x-axis is particle size (diameter) based on what I understand. What I am confused is whether the distributeMass command controls on Y-axis or on X-axis? For example, if distributeMass command controls on Y-axis, it may mean that percentage passing by mass (distributeMass=True) or by count (distributeMass=False)? If distributeMass command controls on X-axis, it may mean that X-axis is particle diameter (distributeMass=False) or particle mass (distributeMass=True)? >spheres using a common multiplier Thanks, it is clear. >Maybe they used internalCompaction=False. I'm still interested in how it is achieved by setting internalCompaction=False. I have also tried internalCompaction=False, the problem is that when set internalCompaction=False, the size of the sample changed. For example, the size of initial packing is 0.7*0.7*1.4 (mn,mx=Vector3(0,0,0),Vector3(0.7,0.7,1.4)), when I set internalCompaction=True, after compacted state completed, the size of the packing stays around 0.7*0.7*1.4. However, when I set internalCompaction=False, after compacted state completed, the size of the packing is changed to 0.26*0.26*0.9, and in this case, I can not obtain a reasonable sample in terms of size. The following MWE may show this question by changing internalCompaction= True to False. ### from yade import pack, plot nRead=readParamsFromTable( num_spheres=1000, compFricDegree = 30, key='_triax_base_', unknownOk=True ) from yade.params import table num_spheres=table.num_spheres key=table.key targetPorosity = 0.43 compFricDegree = table.compFricDegree finalFricDegree = 30 rate=-0.02 damp=0.2 stabilityThreshold=0.01 young=5e6 mn,mx=Vector3(0,0,0),Vector3(0.7,0.7,1.4) 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')) walls=aabbWalls([mn,mx],thickness=0,material='walls') wallIds=O.bodies.append(walls) sp=pack.SpherePack() sp.makeCloud(mn,mx,-1,0.,num_spheres,False, 0.95,seed=1) O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp]) Gl1_Sphere.quality=3 ### DEFINING ENGINES ### triax=TriaxialStressController( maxMultiplier=1.+2e4/young, finalMaxMultiplier=1.+2e3/young, thickness = 0, stressMask = 7, internalCompaction=True,## please change True to False here to look at what I say ) 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()] ), GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8), triax, newton ] Gl1_Sphere.stripes=0 if nRead==0: yade.qt.Controller(), yade.qt.View() ### APPLYING CONFINING PRESSURE ### triax.goal1=triax.goal2=triax.goal3=-1 while 1: O.run(1000, True) unb=unbalancedForce() print 'unbalanced force:',unb,' mean stress: ',triax.meanStress if unbtargetPorosity: # we decrease friction value and apply it to all the bodies and contacts compFricDegree = 0.95*compFricDegree setContactFriction(radians(compFricDegree)) print "\r Friction: ",compFricDegree," porosity:",triax.porosity, sys.stdout.flush() O.run(500,1) print "###Compacted state saved ###" Cheers, Leonard -- 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
Re: [Yade-users] [Question #686179]: How to use PSD
Question #686179 on Yade changed: https://answers.launchpad.net/yade/+question/686179 Status: Open => Answered Robert Caulk proposed the following answer: Hello, >Should I set distributeMass = True or False. Depends on what you want to simulate. Do you want the psd distribution applied to particle count or mass fraction? Quote from the doc[1]: "By default (with distributeMass==False), the distribution is applied to particle radii. The usual sense of “particle size distribution” is the distribution of mass fraction (rather than particle count); this can be achieved with distributeMass=True." > I wonder if all the particles are scaled up with the same scalar? If internalCompaction=True, TriaxialStressController uses growParticles [2], which changes the size of the spheres using a common multiplier [3]. > is there no particle growing during the isotropic compaction phase? Maybe they used internalCompaction=False. Cheers, Robert [1]https://yade-dem.org/doc/yade.pack.html#yade._packSpheres.SpherePack.makeCloud [2]https://gitlab.com/yade-dev/trunk/blob/master/pkg/dem/TriaxialStressController.cpp#L274 [3]https://gitlab.com/yade-dev/trunk/blob/master/pkg/dem/Shop_02.cpp#L848 -- 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
[Yade-users] [Question #686179]: How to use PSD
New question #686179 on Yade: https://answers.launchpad.net/yade/+question/686179 Hi, I'm trying to generate an assembly with PSD like Fig. 9 in [1] or Fig. 1 in [2]. Firstly, I set distributeMass = True, then, I pick up several point (xi,yi) from Fig. 9 in [1] or Fig. 1 in [2] and make psdSizes=[x1,x2,x3,x4],psdCumm=[0,y2,y3,1]. I am not sure if above mentioned way is correct, especially in terms of the following issues. 1. Should I set distributeMass = True or False. 2. In TriaxialStressController engine during triaxial test simulation[3], internalCompaction is set as True to reach confining pressure by growing particles. I wonder if all the particles are scaled up with the same scalar? Like the scale up in Fig. 1 in [2]? 3. By the way, I'm very curious about how it is achieved in Fig. 9 in [1], the numerical PSD is almostly agreed with experimental PSD, is there no particle growing during the isotropic compaction phase? Thanks a lot. Leonard [1]https://link.springer.com/article/10.1007%2Fs10035-016-0687-0 [2]https://link.springer.com/article/10.1007/s11440-017-0593-6 [3]https://github.com/yade/trunk/blob/master/examples/triax-tutorial/script-session2.py -- 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
