Re: [Yade-users] [Question #680317]: different result after scenetostring
Question #680317 on Yade changed: https://answers.launchpad.net/yade/+question/680317 Status: Open => Expired Launchpad Janitor expired the question: This question was expired because it remained in the 'Open' state without activity for the last 15 days. -- 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 #680317]: different result after scenetostring
Question #680317 on Yade changed: https://answers.launchpad.net/yade/+question/680317 Status: Solved => Open zhou qian is still having a problem: Hi: I need to use JCFpmMat in my program. I want to know if I use JCFpmMat with sceneToString, will it loss any parameters? It seems there are't any read_only paras but I want to make sure it won't get wrong. Yours, Joe -- 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 #680317]: different result after scenetostring
Question #680317 on Yade changed: https://answers.launchpad.net/yade/+question/680317 Status: Answered => Solved zhou qian confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- 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 #680317]: different result after scenetostring
Question #680317 on Yade changed:
https://answers.launchpad.net/yade/+question/680317
Status: Open => Answered
Jan Stránský proposed the following answer:
Hi Joe,
nice finding.
The reason is that O.sceneToString only saves "python" variables, defined in
YADE_CLASS_...macros.
CpmPhys has some read-only variables defined outside this macro [1] that are
not saved and are reset by O.stringToScene.
You can try:
###
print max(i.phys.epsT.norm() for i in O.interactions)
print max(i.phys.sigmaT.norm() for i in O.interactions)
scene = O.sceneToString() !
O.stringToScene(scene) !
print max(i.phys.epsT.norm() for i in O.interactions)
print max(i.phys.sigmaT.norm() for i in O.interactions)
v2 = (trsf2-O.cell.trsf)/(500*O.dt)
O.cell.velGrad = v2
O.run(500,True)
print(O.cell.trsf)
print(utils.getStress())
print max(i.phys.shearForce.norm() for i in O.interactions) #!
###
if O.sceneToString() and O.stringToScene(scene) is used or not, the shear
strain and shear forces and therefore stress are different.
A solution would be to change the source code and put all these variables to
YADE_BASE...
To preserve the read-onlyness, probably Attr::readonly flag (similar to e.g.
[2]) should be used.
So basically replacing
Real omega = 0
...
.def_readonly("omega",::omega,"...")
to
((Real,omega,0,Attr::readonly,"..."))
cheers
Jan
[1] https://gitlab.com/yade-dev/trunk/blob/master/pkg/dem/ConcretePM.hpp#L145
[2] https://gitlab.com/yade-dev/trunk/blob/master/core/Scene.hpp#L78
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[Yade-users] [Question #680317]: different result after scenetostring
New question #680317 on Yade: https://answers.launchpad.net/yade/+question/680317 Hi: I noticed that the results of my simulation is different if I use 'scenetostring' and 'stringtoscene' (I also tested save and load). I generated a periotric cell and change to strain from (0,0,0,0,0,0,0,0,0) to (0,0,0,0,0,0,0,0,-0.2) to (0,0,0,0,0,0,0,0,-0.1). Here are my codes: from libyade import yade from yade import* from yade import pack, Vector3, Vector3, utils from minieigen import Vector3, Matrix3, Matrix6 def randomPeriPack(radius,initSize,seed): O.switchScene(); O.resetThisScene() sp=pack.SpherePack() O.periodic=True O.cell.setBox(initSize) sp.makeCloud(Vector3().Zero,O.cell.refSize,radius,0.,-1,True,seed=seed) O.engines=[ForceResetter(),InsertionSortCollider([Bo1_Sphere_Aabb()],verletDist=.05*radius),InteractionLoop([Ig2_Sphere_Sphere_ScGeom()],[Ip2_FrictMat_FrictMat_FrictPhys()],[Law2_ScGeom_FrictPhys_CundallStrack()]),PeriIsoCompressor(charLen=2*radius,stresses=[-100e9,-1e8],maxUnbalanced=1e-2,doneHook='O.pause();',globalUpdateInt=20,keepProportions=True),NewtonIntegrator(damping=.8)] O.materials.append(FrictMat(young=30e9,frictionAngle=.1,poisson=.3,density=1e3)) for s in sp: O.bodies.append(utils.sphere(s[0],s[1])) O.dt=utils.PWaveTimeStep() O.timingEnabled=True O.run(); O.wait() for b in O.bodies: b.state.pos = O.cell.wrap(b.state.pos) ret=pack.SpherePack() ret.fromSimulation() O.switchScene() return ret young = 4e6 O.materials.append(CpmMat(young=young,poisson=.2,epsCrackOnset=1e100,sigmaT=1e100,relDuctility=2)) sp = randomPeriPack(.01,.1*Vector3.Ones,10) sp.toSimulation() O.engines = [ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=1.5,label='is2aabb')],allowBiggerThanPeriod=True), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=1.5,label='ss2d3dg')], [Ip2_CpmMat_CpmMat_CpmPhys()], [Law2_ScGeom_CpmPhys_Cpm()]), NewtonIntegrator(damping=.1), ] O.dt = 0. O.step() O.dt = 0.0002 is2aabb.aabbEnlargeFactor = 1. ss2d3dg.interactionDetectionFactor = 1. Strain1 = Matrix3(0,0,0,0,0,0,0,0,-0.2) Strain2 = Matrix3(0,0,0,0,0,0,0,0,-0.1) I = Matrix3.Identity trsf1 = Strain1+I trsf2 = Strain2+I v1 = (trsf1-O.cell.trsf)/(500*O.dt) O.cell.velGrad = v1 O.run(500,True) print(O.cell.trsf) scene = O.sceneToString() ! O.stringToScene(scene) ! v2 = (trsf2-O.cell.trsf)/(500*O.dt) O.cell.velGrad = v2 O.run(500,True) print(O.cell.trsf) print(utils.getStress()) If you run the script, I think the result of stress[8] should be -567126, and if you delete the scenetostring and stringtoscene, the result is -733878. My yade version is 2017.01a. Maybe my yade version is relatively old?? Yours, Joe -- 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
