Re: [Yade-users] [Question #706571]: Problem with using rolling resistance in ViscElCap physics
Question #706571 on Yade changed: https://answers.launchpad.net/yade/+question/706571 Status: Needs information => Open Roxana Saghafian Larijani gave more information on the question: Hi Bruno, I have only added mR=0.001 in mat and mat2 as : mat=O.materials.append( ViscElCapMat(..., mR=0.001,)) and mat2=O.materials.append( ViscElCapMat(..., mR=0.001,)), and it did not work. Working version: mat=O.materials.append( ViscElCapMat(frictionAngle=fr, density=rho, Vb=vB, gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS, cn=ccN, cs=ccS ) ) mat2=O.materials.append( ViscElCapMat(frictionAngle=fr, density=rho,Vb=vB, gamma=Gamma, theta=90, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS, cn=ccN, cs=ccS ) ) non working: mat=O.materials.append( ViscElCapMat(frictionAngle=fr, density=rho, mR=0.001, Vb=vB, gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS, cn=ccN, cs=ccS ) ) mat2=O.materials.append( ViscElCapMat(frictionAngle=fr, density=rho, mR=0.001, Vb=vB, gamma=Gamma, theta=90, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS, cn=ccN, cs=ccS ) ) Regards, Roxana -- 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 #706571]: Problem with using rolling resistance in ViscElCap physics
New question #706571 on Yade:
https://answers.launchpad.net/yade/+question/706571
Hi all,
I am trying to add rolling resistance (mR) to my simulation . When I add mR to
my script, the simulation does not run (I think it gets stuck somehow as it
does not give me any output that it gives in the case I do not add mR). I was
wondering what might be the problem.
I have attached my script below.
from yade import pack
from yade import utils, wrapper
###functions for exporting data
os.mkdir(os.getcwd()+'/VTK/')
def savePropData(O):
from yade import export
import numpy as np
path = os.getcwd()+'/VTK/'
vtkExporter = export.VTKExporter(path)
vtkExporter.exportSpheres(numLabel = O.iter, what = dict( \
dist = 'b.state.pos.norm()', \
linVelocity = 'b.state.vel', \
angVelocity = 'b.state.angVel', \
mass = 'b.state.mass', \
mat_rand = 'b.material.id', \
id='b.id' , \
numOfContacts = 'len(b.intrs())'))
##Material properties
fr=0.9
rho = 3000
r = 0.0005
Gamma = 0.0
Theta = 0.0
vB = 0.0
CapType="Rabinovich"
kkN= 2*(100)
kkS= 2*(30)
ccN= 2*(0.0005)
ccS= 2*(0.0005)
###en=0.3
#time parameters
O.dt = 5*1e-6
it=math.floor(0.1/O.dt )
simT=10
#drum
drumr=0.05
druml=0.03
mat=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, mR=0.001, Vb=vB,
gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS,
cn=ccN, cs=ccS )
)
mat2=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, mR=0.001, Vb=vB,
gamma=Gamma, theta=90, Capillar=True, CapillarType=CapType, kn=kkN, ks=kkS,
cn=ccN, cs=ccS )
)
#defining the spheres
sp=pack.SpherePack()
sp.makeCloud((drumr-0.7*drumr,drumr-0.7*drumr,0.0015),(drumr+0.7*drumr,drumr+0.7*drumr,0.0285),rMean=r,num=45000)
sp.toSimulation(material=mat)
Nprtcl=len(O.bodies)
print(Nprtcl)
#liquidMigration
VV=0.0
Vmin=0.0
for s in O.bodies:
if not type(s.shape)==wrapper.Sphere:
continue
s.state.Vf=VV * (4/3) * 3.14*(s.shape.radius)**3
s.state.Vmin=Vmin
Drum=geom.facetCylinder(material=mat2,center=(0.05,0.05,0.015),
segmentsNumber=32, wallMask=4,
radius=drumr,height=20*druml,orientation=Quaternion(Vector3(0,0,1),(pi/2.0)))
walls = O.bodies.append(Drum)
O.periodic = True
O.cell.setBox(0.5,0.5,0.03)
##engine
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()],
allowBiggerThanPeriod = True),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()],
[Law2_ScGeom_ViscElCapPhys_Basic()],
),
NewtonIntegrator(gravity=[0, -9.8, 0]),
RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,
zeroPoint=[0.05,0.05,0.015], angularVelocity=0.45),
PyRunner(command='savePropData(O)', iterPeriod=it)
]
#Functions
import math
duration=simT/O.dt
O.run( 1 * math.floor(duration),True)
###saving for Restart
O.save('test.bz2')
import pandas as pd
intrState = pd.DataFrame(columns =
['id1','id2','Fn','Fv','sCrit','normalForce0','normalForce1','normalForce2',
'shearForce0','shearForce1','shearForce2'], dtype=object)
for ii in O.interactions:
iiState =
pd.DataFrame({'id1':[ii.id1],'id2':[ii.id2],'Fn':[ii.phys.Fn],'Fv':[ii.phys.Fv],
'sCrit':[ii.phys.sCrit], 'normalForce0':[ii.phys.normalForce[0]],
'normalForce1':[ii.phys.normalForce[1]],
'normalForce2':[ii.phys.normalForce[2]], 'shearForce0':[ii.phys.shearForce[0]],
'shearForce1':[ii.phys.shearForce[1]], 'shearForce2':[ii.phys.shearForce[2]]})
intrState = intrState.append(iiState,ignore_index = True)
intrState.to_csv('tmpIntrState.csv')
###
Thanks in advance for your response!
Regards,
Roxana
--
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 #704389]: Problem with OpenMP
New question #704389 on Yade:
https://answers.launchpad.net/yade/+question/704389
Dear all ,
I am trying to run my simulation on multiple cores using openMP (using j -n).
However, I can see that only one core is being used at 100% cpu. I have
provided the MWE below and was wondering if you know what might be wrong?
I am not sure if it is the same problem as question 689131 or not. I tried to
use sp.cellFill as Jan mentions in that question, but if I am not mistaken it
cannot be used for periodic=False case , and my simulation is not periodic.
from yade import ymport
from yade import pack
from yade import utils, plot,wrapper
fr = 0.38
rho = 3000
En = 0.22
Et = 0.22
poi=0.3
yoM=200e6
r = 0.0005
Gamma = 0.073
Theta = 0
vB = 6.03 * 1e-9
CapType="Rabinovich"
KN=2*(47.17)
KS=2*(13.48)
CN=2*(0.0053)
CS=2*(0.0015)
##definig material
mat=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType,en=En,
et=Et,kn=KN,ks=KS,cn=CN, cs=CS)
)
#defining the spheres
sp=pack.SpherePack()
sp.makeCloud((-0.033,-0.033,-0.01),(0.033,0.033,0.01),rMean=r)
sp.toSimulation(material=mat)
Nprtcl=len(O.bodies)
print(Nprtcl)
Tt= utils.PWaveTimeStep()
O.dt = 0.5*Tt
#liquidMigration
VV=0.03
Vmin=0.0
for s in O.bodies:
if not type(s.shape)==wrapper.Sphere:
continue
s.state.Vf=VV * (4/3) * 3.14*(s.shape.radius)**3
s.state.Vmin=Vmin
##
Drum=geom.facetCylinder(material=mat,center=(0.0,0.0,0.0), segmentsNumber=32,
radius=0.05,height=0.03,orientation=Quaternion(Vector3(0,0,1),(pi/2.0)))
walls = O.bodies.append(Drum)
##engine
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()],
[Law2_ScGeom_ViscElCapPhys_Basic()],
),
NewtonIntegrator(gravity=[0, -9.8, 0]),
RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,
zeroPoint=[0.0,0.0,0.0], angularVelocity=0.45),
LiqControl(label='lqc')
]
import math
O.timingEnabled = 1
from yade import timing
duration=60.0/O.dt
O.run( 2 * math.floor(duration),True)
timing.stats()
###saving for Restart
O.save('test.bz2')
Regards,
Roxana
--
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 #704367]: OpenMp
Question #704367 on Yade changed: https://answers.launchpad.net/yade/+question/704367 Status: Answered => Solved Roxana Saghafian Larijani 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
[Yade-users] [Question #704367]: OpenMp
New question #704367 on Yade: https://answers.launchpad.net/yade/+question/704367 Dear all, I would like to run my simulation in parallel on multiple cores on cluster. The number of particles in my system is below 1 million and based the suggestion in the documentation I want to use OpenMp (rather than MPI). In order to do so I have used O.run( Number of iteration ,True) in the script and I am using -j n as: ~/install/bin/yade-2022-04-13.git-5bd3ade -nx -j24 test.py I was wondering if using -j n is all I have to do to run it on multiple cores? Sincerely yours, Roxana Saghafian -- 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 #704035]: O.save/O.load problem
Question #704035 on Yade changed: https://answers.launchpad.net/yade/+question/704035 Status: Answered => Solved Roxana Saghafian Larijani confirmed that the question is solved: Thanks Karol Brzezinski, 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 #704035]: O.save/O.load problem
Question #704035 on Yade changed: https://answers.launchpad.net/yade/+question/704035 Roxana Saghafian Larijani gave more information on the question: Hi Karol, Thanks for your suggestion! In fact, in line 47: https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/ViscoelasticCapillarPM.hpp#L47, if CapType gets changed to int, ii.phys.dict() will work fine. However, in the second simulation with O.load, when I print ii.phys.Dict(), Fn,Fv, normalForce and ShearForce turn out to be Nan! Regards, Roxana -- 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 #704035]: O.save/O.load problem
Question #704035 on Yade changed: https://answers.launchpad.net/yade/+question/704035 Roxana Saghafian Larijani posted a new comment: Hi Karol, Thanks for your response! I changed the interaction physics to ViscEl instead of ViscElCap (Law2_ScGeom_ViscElPhys_Basic()), and surprisingly the O.save/O.load process is working correctly! So maybe the problem exists only in the model that I am using, and something related to liquid bridges! Regards, Roxana Saghafian -- 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 #704035]: O.save/O.load problem
Question #704035 on Yade changed:
https://answers.launchpad.net/yade/+question/704035
Status: Needs information => Open
Roxana Saghafian Larijani gave more information on the question:
Sorry, eta is an attribute that I have added to ViscElCapMat in the source
code, so please consider the following script without eta:
from yade import ymport
from yade import pack
from yade import utils, plot,wrapper
from yade import export
fr = 0.38
rho = 3700
En = 0.22
Et = 0.22
poi=0.3
yoM=200e6
r = 0.0005
Gamma = 0.072
Theta = 0
vB = 6.03 * 1e-9
CapType="Rabinovich"
Tc=0.00045
##defining material
mat=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType,en=En,
et=Et,tc=Tc)
)
mat2=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, theta=90, Capillar=True, CapillarType=CapType, en=En,
et=Et,tc=Tc)
)
#defining the spheres
sp=pack.SpherePack()
sp.makeCloud((-0.035,-0.035,-0.01),(0.035,0.035,0.01),psdSizes=[0.001,0.002,0.003,0.004],
psdCumm=[0.0,0.8,0.95,1.0])
sp.toSimulation(material=mat)
Nprtcl=len(O.bodies)
print(Nprtcl)
Tt= utils.PWaveTimeStep()
O.dt = 0.5*Tt
print(O.dt)
#liquidMigration
VV=0.03
Vmin=0.0
for s in O.bodies:
if not type(s.shape)==wrapper.Sphere:
continue
s.state.Vf=VV * (4/3) * 3.14*(s.shape.radius)**3
s.state.Vmin=Vmin
##
Drum=geom.facetCylinder(material=mat2,center=(0.0,0.0,0.0),radius=0.05,height=0.03,orientation=Quaternion(Vector3(0,0,1),(pi/2.0)))
walls = O.bodies.append(Drum)
##engine
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()],
[Law2_ScGeom_ViscElCapPhys_Basic()],
),
NewtonIntegrator(gravity=[0, -9.8, 0]),
RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,
zeroPoint=[0.0,0.0,0.0], angularVelocity=2.0),
LiqControl(label='lqc'),
VTKRecorder(iterPeriod=1000,recorders=['spheres','facets','colors'],fileName='test-')]
O.run( 50,True)
O.save('test.bz2')
Regards,
Roxana Saghafian
--
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 #704035]: O.save/O.load problem
New question #704035 on Yade:
https://answers.launchpad.net/yade/+question/704035
Hi all,
I am trying to continue my simulation in a rotating drum after I stop it. To do
this I save my first simulation using O.save at the end of my first script. I
also export vtu files for visualisation in Paraview. This works correctly. Then
I O.load the saved file (test.bz2) at the beginning of the second script. The
simulation goes on and gives me vtu files. However, in the vtu files some
points are Nan and I do not get a proper visualisation in Paraview (it does not
show the particles in paraview). I was wondering if you could help me with this
issue.
I have attached my two scripts here as well :
Script 1:
from yade import ymport
from yade import pack
from yade import utils, plot,wrapper
from yade import export
nCG=1
fr = 0.38
rho = 3700
En = 0.22
Et = 0.22
poi=0.3
yoM=200e6
r = 0.0005
Gamma = 0.072
Theta = 0
vB = 6.03 * 1e-9 * (nCG**3)
Eta= 0.001
CapType="Rabinovich"
Tc=0.00045
##defining material
mat=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, eta=Eta, theta=Theta, Capillar=True,
CapillarType=CapType,en=En, et=Et,tc=Tc)
)
mat2=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, eta=0, theta=90, Capillar=True, CapillarType=CapType,
en=En, et=Et,tc=Tc)
)
#defining the spheres
sp=pack.SpherePack()
sp.makeCloud((-0.035,-0.035,-0.01),(0.035,0.035,0.01),psdSizes=[0.001,0.002,0.003,0.004],
psdCumm=[0.0,0.8,0.95,1.0])
sp.toSimulation(material=mat)
Nprtcl=len(O.bodies)
print(Nprtcl)
Tt= utils.PWaveTimeStep()
O.dt = 0.5*Tt
print(O.dt)
#liquidMigration
VV=0.03
Vmin=0.0
for s in O.bodies:
if not type(s.shape)==wrapper.Sphere:
continue
s.state.Vf=VV * (4/3) * 3.14*(s.shape.radius)**3
s.state.Vmin=Vmin
##
Drum=geom.facetCylinder(material=mat2,center=(0.0,0.0,0.0),radius=0.05,height=0.03,orientation=Quaternion(Vector3(0,0,1),(pi/2.0)))
walls = O.bodies.append(Drum)
##engine
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()],
[Law2_ScGeom_ViscElCapPhys_Basic()],
),
NewtonIntegrator(gravity=[0, -9.8, 0]),
RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,
zeroPoint=[0.0,0.0,0.0], angularVelocity=2.0),
LiqControl(label='lqc'),
VTKRecorder(iterPeriod=1000,recorders=['spheres','facets','colors'],fileName='test-')]
O.run( 50,True)
O.save('test.bz2')
Script 2:
from yade import ymport
from yade import pack
from yade import utils, plot,wrapper
from yade import export
O.load('test.bz2')
Nprtcl=len(O.bodies)
print(Nprtcl)
O.run(15000,True)
###
BTW, I am using this version yade-2022-04-13.git-5bd3ade.
Thanks in advance for your respopnse!
--
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 #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
Question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Answered => Solved Roxana Saghafian Larijani confirmed that the question is solved: Thanks for your time and responses to my questions! Regards, Roxana Saghafian -- 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 #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
Question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Needs information => Open Roxana Saghafian Larijani gave more information on the question: Please find the MWE below: from yade import ymport from yade import pack from yade import utils, plot,wrapper fr = 0.38 rho = 2500 En = 0.7 Et = 0.7 poi=0.21 yoM=63e6 O.dt = 0.05 r = 0.01#0.002381 ##definig material mat=O.materials.append( ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,en=En, et=Et) ) #defining the spheres sp=pack.SpherePack() sp.makeCloud((0.6,0.6,0.05),(1,1,0.15),rMean=r) sp.toSimulation(material=mat) Nprtcl=len(O.bodies) Drum=geom.facetCylinder((0.8,0.8,0.1),radius=0.5,height=0.2,orientation=Quaternion(Vector3(0,0,1),(pi/2.0)), wallMask=4) walls = O.bodies.append(Drum) ##periodic boundary O.periodic = True O.cell.setBox(5,5,0.2) ##engine O.engines = [ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()],allowBiggerThanPeriod = True), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()], [Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()], [Law2_ScGeom_ViscElCapPhys_Basic()], ), NewtonIntegrator(gravity=[0, -9.8, 0]), RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,zeroPoint=[0.8,0.8,0.1],angularVelocity=1.68) ] from yade import qt qt.View() O.run() >What is the result with Law2_ScGeom_FrictPhys_CundallStrack? I checked it and the problem does not get solved by changing to Cundall. >But firstly I would guess the problem is due to the fact "If I remember correctly, the large bodies are not "periodically copied", so the spheres from "next" cells do not interact with the wall." discussed in [2], #4 I think this is the problem! Because it is like the particles pass through the drum wall and does not interact with it! Regards, Roxana Saghafian From: nore...@launchpad.net on behalf of Jan Stránský Sent: Thursday, August 18, 2022 9:20 AM To: Saghafian Larijani, Roxana (UT-ET) Subject: Re: [Question #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder ) Your question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Open => Needs information Jan Stránský requested more information: > However, I still have a problem. please, provide a MWE as discussed above. > Might it be because I am using (Law2_ScGeom_ViscElCapPhys_Basic()) as it is mentioned in the question 429604? What is the result with Law2_ScGeom_FrictPhys_CundallStrack? But firstly I would guess the problem is due to the fact "If I remember correctly, the large bodies are not "periodically copied", so the spheres from "next" cells do not interact with the wall." discussed in [2], #4 If it is this case or not would be clear with the MWE. Cheers Jan [2] https://answers.launchpad.net/yade/+question/701266 -- To answer this request for more information, you can either reply to this email or enter your reply at the following page: https://answers.launchpad.net/yade/+question/702751 You received this question notification because you asked the 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 #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
Question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Answered => Open Roxana Saghafian Larijani is still having a problem: Thank you for your response! I managed to display the rotating drum in the same way as the default case by shifting the drum and the particles. However, I still have a problem. It seems that there are some problems with the contact detection of some particles, and they get out of the drum. Might it be because I am using ( Law2_ScGeom_ViscElCapPhys_Basic() ) as it is mentioned in the question 429604? Regards, Roxana Saghafian From: nore...@launchpad.net on behalf of Jan Stránský Sent: Monday, August 15, 2022 2:25 PM To: Saghafian Larijani, Roxana (UT-ET) Subject: Re: [Question #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder ) Your question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Open => Answered Jan Stránský proposed the following answer: It depends on definition. In Yade, if you enable periodicity, it is applied in 3 direction, no matter what. But enlarging the periodic cell dimensions, you can "disable" some directions, making the simulation being practically periodic only in some direction(s). Still, the **visualization** is done such that all particles are displayed inside the cell. But the periodicity itself (i.e. periodic contact detection between particles and periodic images of other particles) is not effectively present in "disabled" directions. Cheers Jan -- If this answers your question, please go to the following page to let us know that it is solved: https://answers.launchpad.net/yade/+question/702751/+confirm?answer_id=4 If you still need help, you can reply to this email or go to the following page to enter your feedback: https://answers.launchpad.net/yade/+question/702751 You received this question notification because you asked the 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 #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
Question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Answered => Open Roxana Saghafian Larijani is still having a problem: Isn’t it the case that the periodic boundary is being implemented in all three directions? Is there any way I can avoid periodic boundary condition in x and y direction? Regards, Roxana Saghafian Roxana Saghafian Larijani | PhD student ET-CME, UTwente | https://tusail.eu<https://tusail.eu/> From: nore...@launchpad.net on behalf of Jan Stránský Sent: Monday, August 15, 2022 1:31 PM To: Saghafian Larijani, Roxana (UT-ET) Subject: Re: [Question #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder ) Your question #702751 on Yade changed: https://answers.launchpad.net/yade/+question/702751 Status: Open => Answered Jan Stránský proposed the following answer: > I have also attached the Drum.stl attachments are not possible here in launchpad questions.. Please either provide the content of the file, or make your code using alternatives, like facetCylinder > it gets devided to four different parts that might be right for other cases but for my case it does not seem like a rotating drum. Thanks for clarification. Actually, it IS proper rotating drum and is "right" :-) It is just the way it is displayed, particles positions wrapped inside the periodic cell, not outside. To overcome this issue, you can: - postprocess the positions to look more natural - put the drum and particles to the "center" of the cell (i.e. the visualization of particles is natural). Note that the results should be exactly the same as in the "default" case. Cheers Jan -- If this answers your question, please go to the following page to let us know that it is solved: https://answers.launchpad.net/yade/+question/702751/+confirm?answer_id=2 If you still need help, you can reply to this email or go to the following page to enter your feedback: https://answers.launchpad.net/yade/+question/702751 You received this question notification because you asked the 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 #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
Question #702751 on Yade changed:
https://answers.launchpad.net/yade/+question/702751
Status: Needs information => Open
Roxana Saghafian Larijani gave more information on the question:
Hello Jan,
The problem is that I think the periodic boundary is being applied in all
directions (but I only need z direction to have period boundary condition ).
So, when I increase the dimensions of O.cell.setBox, it gets devided to four
different parts that might be right for other cases but for my case it does not
seem like a rotating drum. With smaller dimensions of O.cell.setBox, also it
does not give me good result as I think the periodic boundary condition is
being implemented in all directions.
This is my script; I have also attached the Drum.stl file.
from yade import ymport
from yade import pack
from yade import utils, plot,wrapper
###functions for exporting data
os.mkdir(os.getcwd()+'/VTK/')
def savePropData(O):
from yade import export
import numpy as np
path = os.getcwd()+'/VTK/'
vtkExporter = export.VTKExporter(path)
vtkExporter.exportSpheres(numLabel = O.iter, what = dict( \
dist = 'b.state.pos.norm()', \
linVelocity = 'b.state.vel', \
angVelocity = 'b.state.angVel', \
mass = 'b.state.mass', \
mat_rand = 'b.material.id', \
numOfContacts = 'len(b.intrs())'))
fr = 0.38
rho = 2500
En = 0.7
Et = 0.7
poi=0.21
yoM=63e6
O.dt = 0.05
r = 0.008#0.002381
Gamma =0.073 #20.6 * 1e-3
Theta = 35
vB = 0.0
CapType="Rabinovich"
##definig material
mat=O.materials.append(
ViscElCapMat(frictionAngle=fr, density=rho, poisson=poi, young= yoM,
Vb=vB, gamma=Gamma, theta=Theta, Capillar=True, CapillarType=CapType,en=En,
et=Et)
)
mat2=O.materials.append(
ViscElCapMat(frictionAngle=0.29, density=rho, poisson=0.35, young=
12e6, Vb=vB, gamma=Gamma, theta=90, Capillar=True,
CapillarType=CapType,en=0.72, et=0.72)
)
#defining the spheres
sp=pack.SpherePack()
sp.makeCloud((-0.2,-0.2,-0.05),(0.2,0.2,0.05),rMean=r)
sp.toSimulation(material=mat)
Nprtcl=len(O.bodies)
walls = O.bodies.append(ymport.stl('Drum.stl',material=mat2))
##periodic boundary
O.periodic = True
O.cell.setBox(0.4,0.4,0.1)
##engine
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),
Bo1_Facet_Aabb()],allowBiggerThanPeriod=True ),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_ViscElCapMat_ViscElCapMat_ViscElCapPhys()],
[Law2_ScGeom_ViscElCapPhys_Basic()],
),
NewtonIntegrator(gravity=[0, -9.8, 0]),
RotationEngine(ids=walls,rotationAxis=[0,0,1],rotateAroundZero=True,angularVelocity=1.68),
PyRunner(command='savePropData(O)', iterPeriod=5000)
]
O.run()
Thank you!
Regards,
Roxana Saghafian
From: nore...@launchpad.net on behalf of Jan Stránský
Sent: Monday, August 15, 2022 9:30 AM
To: Saghafian Larijani, Roxana (UT-ET)
Subject: Re: [Question #702751]: periodic boundary in the direction of the
length of a rotating drum (cylinder )
Your question #702751 on Yade changed:
https://answers.launchpad.net/yade/+question/702751
Status: Open => Needs information
Jan Stránský requested more information:
Hello,
> But I get a very weird simulation.
please be (much) more specific.
> Is the center of the created box using O.cell.setBox(5,5,0.2) on
(0,0,0) ?
Periodic cell has no center. Or has arbitrary center at any point. It is
one of the (possibly non-intuitive) features of periodicity.
> I was wondering if you could help me find where are my mistakes and
how I can apply the boundary condition in this case.
The code seems OK.
Please describe your problem more in detail.
Please provide a MWE [1], i.e. provide Drum.stl or replace it e.g. with
something like geom.facetCylinder
Cheers
Jan
[1] https://www.yade-dem.org/wiki/Howtoask
--
To answer this request for more information, you can either reply to
this email or enter your reply at the following page:
https://answers.launchpad.net/yade/+question/702751
You received this question notification because you asked the 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
[Yade-users] [Question #702751]: periodic boundary in the direction of the length of a rotating drum (cylinder )
New question #702751 on Yade:
https://answers.launchpad.net/yade/+question/702751
Hello,
I am trying to simulate a rotating drum. To avoid the effect of the front and
back wall of the drum, instead of choosing the length of the drum very long I
want to set periodic boundary only in this direction(z direction). So I defined
a box with the same dimension of the drum in the z direction, and bigger than
the radius of the drum. The drum center is located on (0,0,0) with the radius
0.5m and length of 0.2. So I defined the box as :
sp=pack.SpherePack()
sp.makeCloud((-0.3,-0.3,-0.05),(0.3,0.3,0.05),rMean=r)
sp.toSimulation(material=mat)
walls = O.bodies.append(ymport.stl('Drum.stl',material=mat2))
O.periodic = True
O.cell.setBox(5,5,0.2)
Based on the answers to some similar questions I also added
allowBiggerThanPeriod=True:
InsertionSortCollider([Bo1_Sphere_Aabb(),
Bo1_Facet_Aabb()],allowBiggerThanPeriod=True ),
But I get a very weird simulation.
Is the center of the created box using O.cell.setBox(5,5,0.2) on (0,0,0) ?
I was wondering if you could help me find where are my mistakes and how I can
apply the boundary condition in this case.
Regards,
Roxana Saghafian
--
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 #702522]: Adding the Maximum capillary force of wet particles in contact
New question #702522 on Yade:
https://answers.launchpad.net/yade/+question/702522
Hi,
I am using the ViscoElasticCapillar phys but in this model the capillary force
is only added when the penetrationDepth is negative which means particles do
not have overlap. However, the maximum capillary force which is equal to
-(2 * M_PI * R * Gamma * cos(phys.theta));
will be exerted on the wet particles while the penetration depth is >=0. I
tried to add this force but I am not sure if I am adding it in the right place
as the normalForce plot does not change .
In line 205 TIMING_DELTAS_CHECKPOINT("force_calculation_penetr"); I think here
the normalForce for of the particles in contact is being calculated based on
the viscoelatic physics. Then here I wanted to add the maximum capillary force
that I mentioned as below starting from the line " if
(geom.penetrationDepth>0.0 && phys.liqBridgeCreated){"
TIMING_DELTAS_CHECKPOINT("force_calculation_penetr");
if (computeForceTorqueViscEl(_geom, _phys, I, force, torque1,
torque2)) {
addForce(id1, -force, scene2);
addForce(id2, force, scene2);
addTorque(id1, torque1, scene2);
addTorque(id2, torque2, scene2);
return true;
} else {
return false;
}
if (geom.penetrationDepth>0.0 && phys.liqBridgeCreated){
const auto MaxCapForce= 2 * M_PI *phys.R
*phys.gamma*cos(phys.theta);
phys.normalForce = -(MaxCapForce) * geom.normal;
addForce(id1, -phys.normalForce, scene2);
addForce(id2, phys.normalForce, scene2);
}
}
Thanks in advance for your answer!
Regards,
Roxana Saghafian
--
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 #702446]: liquid migration
New question #702446 on Yade: https://answers.launchpad.net/yade/+question/702446 Hello, I am using the liquid migration feature in Yade and have a couple of questions: 1) in order to use this model only LiqControl should be added to the engine before the newton integrator, is this right? In addition, I wanted to check that the liquid bridge volume Vb will be calculated based on the given Vf and Vmin. So, we should determine Vf and Vmin for each particle. Then the quantity initialised for Vb must not be important. Is this correct ? 2) If I want to track the liquid content amount of each of the particles in each timestep, in which parameter is it stored ? Vf? Thank you in advance! Regards, Roxana Saghafian -- 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
