# problem in moving particles and existence of weight force on each particle

Hello everyone
I have modeled some polyhedrons in space that have to move downwards due to gravity and then hit the floor and stop and place like a pile on ground.

I have some problem:
1- When the polyhedrons are coming down, no force is applied on them! why? Must be weight force on all the particles.
2- All the particles move down same as a block, non of them act lonely, even those particles that are on the sides and are completely free to fall down.
3- Particles move down very very very slow! Why? For saving time, when the particles are moving down, I increase the gravity to 100000 (with simulation inspect window) for fast movement and when they are near the ground, I set real gravity. But when the lower particles reach the ground the whole particles stop moving and nothing happens! they have to place in form of a pile.

Best regards,
Mahdeyeh

'ring.txt' is in first comment. I really sorry for putting all of the coordinates! it is necessary.

Here is the codes:

import numpy as np
from numpy import *

RawVer=np.genfromtxt('ring.txt',names=True,dtype=None)
# ListVer is list of all the vertices of ring`s polygons
Ver=()
ListVer=[]
for b in RawVer:
if b[0]=='*LWPOLYLINE':
ListVer.append(Ver)
Ver=()
continue
Cordn=b[0]
Cordn=np.fromstring(Cordn, sep=',')
Cordn=tuple(Cordn.tolist())
Cordn1=Cordn+(0.1,) # add z vertex to coordinates
Cordn2=Cordn+(0.2,) # add z vertex to coordinates
if not Cordn1 in Ver:
Ver=Ver+(Cordn1,Cordn2)
ListVer.append(Ver)

RawVer1=np.genfromtxt('boundary.txt',names=True,dtype=None)
Ver1=()
ListVer1=[]
for b in RawVer1:
if b[0]=='*LWPOLYLINE':
ListVer1.append(Ver1)
Ver1=()
continue
Cordn=b[0]
Cordn=np.fromstring(Cordn, sep=',')
Cordn=tuple(Cordn.tolist())
Cordn1=Cordn+(-2,) # add z vertex to coordinates
Cordn2=Cordn+(2,) # add z vertex to coordinates
if not Cordn1 in Ver1:
Ver1=Ver1+(Cordn1,Cordn2)
ListVer1.append(Ver1)

Dolomite = PolyhedraMat()
Dolomite.density = 2870 #kg/m^3
Dolomite.young = 24.36e9 #Pa
Dolomite.poisson = 0.2

for ii in ListVer:

for iii in ListVer1:

O.bodies.erase(341) # delete wall under ring: id: 341

def checkUnbalancedI():
print "iter %d , unbalanced forces %f"%(O.iter, utils.unbalancedForce()) # %[(keyname)][flags][width][.precision]typecode : String Formatting

O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Polyhedra_Aabb(),]), # We can set collider's verletDist to a fraction of the polyhedra minimum size, since it determines how much is each body enlarged to avoid collision detection at every step.
InteractionLoop(
[Ig2_Polyhedra_Polyhedra_PolyhedraGeom(),],
[Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()], # collision "physics"
[Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()] # contact law -- apply forces
),
NewtonIntegrator(gravity=(0,-9.81,0),damping=0.2),
PyRunner(command='checkUnbalancedI()',iterPeriod=1000,realPeriod=3600,label='checker') # call our function defined above every 3600 second or 500 cycles
]

O.engines=O.engines+[PyRunner(iterPeriod=20,command='calm()',label="calmRunner")] # because we need to calm only on the first few steps in our model.

O.dt=10e-6

iii=0
while iii<50:
O.run(1000,True)
for b in O.bodies:
x,y,z=b.state.pos[0],b.state.pos[1],b.state.pos[2]
print x,y,z
iii+=1

here is the boundary.txt:

*LWPOLYLINE
4.08255289437355,10.09276250439400
4.08255289437355,10.09267857306840
1.10586584671010,10.07329237103019
1.10586584671010,10.09157421969086
4.08255289437355,10.09276250439400
*LWPOLYLINE
2.99998810347806,4.00000313063418
2.99999580536406,4.00000313063418
4.08257892143658,10.09266327552933
4.08255971098529,10.09266327552933
2.99998810347806,4.00000313063418
*LWPOLYLINE
2.99999775296742,4.00000184118644
2.99999775296742,3.99999621450540
0.00001072960445,3.99999621450540
0.00001072960445,4.00000143090761
2.99999775296742,4.00000184118644
*LWPOLYLINE
0.00001072960445,-0.00101851609184
0.00001072960445,-0.00102332221523
6.73102849650382,-0.00102332221523
6.73102672595532,-0.00101804720175
0.00001072960445,-0.00101851609184
*LWPOLYLINE
6.73102610626334,-0.00101628886392
6.73103044410717,-0.00101628886392
6.74417862583885,3.99999123254822
6.74373784778834,3.99999123254822
6.73102610626334,-0.00101628886392
*LWPOLYLINE
6.74054678821628,3.01646737237143
6.74054678821628,3.01622648008920
4.57127199826347,-0.00101605441888
4.57126509312429,-0.00101605441888
6.74054678821628,3.01646737237143
*LWPOLYLINE
6.74394420521669,4.00000471313822
6.74397262252020,4.00000471313822
9.00000729919090,17.00000025330731
9.00000375809388,17.00000025330731
6.74394420521669,4.00000471313822
*LWPOLYLINE
9.00199854656797,17.00025743952006
9.00307114485281,17.00025743952006
9.15994103424950,20.99918197533170
9.15058935115142,20.99918197533170
9.00199854656797,17.00025743952006
*LWPOLYLINE
2.99999978909820,4.00000201702022
2.99999978909820,3.99999592144909
4.40711072453751,3.99999592144909
4.40711072453751,4.00000365813553
2.99999978909820,4.00000201702022
*LWPOLYLINE
0.93992738492143,10.08756919501224
0.93233447618162,10.08756919501224
2.09931423935388,17.01043053746017
2.11236344742409,17.01043053746017
0.93992738492143,10.08756919501224
*LWPOLYLINE
2.21380206652951,17.01191891181903
2.20071718190691,17.01191891181903
2.23533459218311,21.09244556170691
2.25092002246048,21.09244556170691
2.21380206652951,17.01191891181903

## Question information

Language:
English Edit question
Status:
Solved
For:
Assignee:
No assignee Edit question
Solved by:
Jan Stránský
Solved:
2019-10-16
Last query:
2019-10-16
2019-10-16
 Mahdeyeh (mahdiye.sky) said on 2019-10-16: #1

*LWPOLYLINE
4.34559213436763,4.19563889421937
4.31042320818271,4.19563889421937
4.31042320818271,4.05445713776717
4.33341560779634,4.09083399031995
4.34559213436763,4.19563889421937
*LWPOLYLINE
4.03286380514289,4.43515523404666
4.17241407759840,4.43515523404666
4.22754503815440,4.36456304177393
4.03458661095554,4.31635372702571
3.96113997193621,4.31635372702571
4.03286380514289,4.43515523404666
*LWPOLYLINE
3.41971278690444,4.44366348237027
3.46320431378560,4.54994505088534
3.51343273075365,4.54994505088534
3.49728561797354,4.44366348237027
3.41971278690444,4.44366348237027
*LWPOLYLINE
4.25338987548479,9.19037679709093
4.25530578302851,9.26087198721953
4.29473955139678,9.29716228619832
4.45949178466789,9.29348909994814
4.45949178466789,9.27716014638961
4.42052364456134,9.19927290554726
4.25338987548479,9.19037679709093
*LWPOLYLINE
3.69430516443352,4.73783273957938
3.69430516443352,4.93182238931670
3.75625576954475,5.05564563793556
3.89787386380568,5.05564563793556
3.88841683538887,4.96484181584951
3.78929567430250,4.73783273957938
3.69430516443352,4.73783273957938
*LWPOLYLINE
5.53396427900000,15.49527006744998
5.53396427900000,15.68925971718730
5.59591488411124,15.81308296580616
5.67025551379046,15.81308296580616
5.62895478886898,15.49527006744998
5.53396427900000,15.49527006744998
*LWPOLYLINE
3.20299113285824,4.55255886035707
3.20299113285824,4.93021944934796
3.34547762106828,5.14690997478260
3.48796338587174,5.14690997478260
3.48796338587174,4.97355774601286
3.39503820161146,4.70114675869974
3.20299113285824,4.55255886035707
*LWPOLYLINE
4.40033164375299,11.47918173746368
4.40033164375299,11.77016621206965
4.49325755141984,11.95590108499795
4.60476849593868,11.95590108499795
4.69149915018601,11.81969535186886
4.54281740855645,11.47918173746368
4.40033164375299,11.47918173746368
*LWPOLYLINE
4.92835616942645,14.39892740389717
4.92835616942645,14.68991187850315
5.02745009112680,14.87564675143145
5.21952367585947,14.73944101830236
5.07084193422991,14.39892740389717
4.92835616942645,14.39892740389717
*LWPOLYLINE
4.76583929759431,12.17259161043259
4.93810928058494,12.21481160990587
4.93810928058494,12.49134998562354
4.76583929759431,12.37070864857438
4.76583929759431,12.17259161043259
*LWPOLYLINE
4.76583929759431,12.37070864857438
4.93810928058494,12.49134998562354
4.76583929759431,12.56707237574099
4.76583929759431,12.37070864857438
*LWPOLYLINE
5.05140345699413,13.55539214235956
5.19530151763249,13.54741637776422
5.19530151763249,13.35342672802690
4.98403958777313,13.35342672802690
5.05140345699413,13.55539214235956
*LWPOLYLINE
5.17688563744608,15.18217349138459
5.41992349477189,15.09903599116629
5.43897328685997,15.35080971716022
5.31312497422737,15.41980884297518
5.22597011377383,15.41980884297518
5.17688563744608,15.18217349138459
*LWPOLYLINE
5.33812779458054,16.06433022160302
5.59591488411124,15.96167054485207
5.59591488411124,15.81308296580616
5.28623172820394,15.81308296580616
5.33812779458054,16.06433022160302
*LWPOLYLINE
3.06673351232743,4.22418949519609
3.00013404299333,4.00010000000000
3.16572105915418,4.00010000000000
3.16572105915418,4.06961939379889
3.06673351232743,4.22418949519609
*LWPOLYLINE
3.35770133484718,4.29249050036819
3.17824277381659,4.36670256960470
3.06682236486762,4.22442160490961
3.16583289976637,4.06981560739483
3.35770133484718,4.29249050036819
*LWPOLYLINE
3.43011808355378,4.06593223135340
3.39084723934804,4.07699751859220
3.38071884232678,4.00643552972899
3.41542145425865,4.00011560382660
3.43011808355378,4.06593223135340
*LWPOLYLINE
3.38051913835552,4.00645187280320
3.40430821630287,4.17218438207034
3.25430323997346,4.17218438207034
3.16592105915418,4.06961152975933
3.16592105915418,4.00010300224751
3.38051913835552,4.00645187280320
*LWPOLYLINE
3.41574768786674,4.00020000000000
3.57524253047781,4.00020000000000
3.57433683722952,4.01959574635174
3.50834393332176,4.12264436383462
3.45514758592311,4.12264436383462
3.43042731558429,4.06594048853765
3.41574768786674,4.00020000000000
*LWPOLYLINE
3.45501659733433,4.12294436383463
3.45201954297334,4.20837990029655
3.47675055671419,4.26501931536194
3.58263633031453,4.21773629486176
3.50840464554390,4.12294436383463
3.45501659733433,4.12294436383463
*LWPOLYLINE
3.47679327806629,4.26521927291669
3.47267017425437,4.30848453800663
3.48916262901855,4.38957344721923
3.59920508210586,4.34153717137189
3.58271255521886,4.21792129149123
3.47679327806629,4.26521927291669
*LWPOLYLINE
3.57565297112033,4.00010000000000
3.79991550127291,4.00010000000000
3.82399339809358,4.14237807307012
3.70260647263054,4.16813509299964
3.57565297112033,4.00010000000000
*LWPOLYLINE
3.80011834497802,4.00010000000000
3.94090229521068,4.00010000000000
3.96562654968141,4.04610500259990
3.89326360520934,4.14235598124846
3.82419250317199,4.14235598124846
3.80011834497802,4.00010000000000
*LWPOLYLINE
3.89345429423333,4.14243516156663
3.92782258076938,4.09672141625537
3.97772604800640,4.06853891233253
4.05338007253401,4.12352553396547
3.97083443300920,4.19914491260061
3.89345429423333,4.14243516156663
*LWPOLYLINE
3.94112934815634,4.00010000000000
3.97781011589861,4.06835276844435
4.05339836671742,4.12329158463585
4.03727739271555,4.02802805939598
4.00526077348474,4.00010000000000
3.94112934815634,4.00010000000000
*LWPOLYLINE
4.03748207111956,4.02803890239077
4.05361031544395,4.12334539008150
4.15092261434123,4.05640817279689
4.10691355946437,4.00012083397573
4.03748207111956,4.02803890239077
*LWPOLYLINE
4.15509595947495,4.05986722950545
4.16713705617665,4.11143949662501
4.11726714788315,4.17330809394204
4.05370671307753,4.12352182889698
4.15106156178076,4.05655534331187
4.15509595947495,4.05986722950545
*LWPOLYLINE
4.21906075286110,4.16504345800685
4.31022320818271,4.16818828396326
4.31022320818271,4.35151663941292
4.22769527913619,4.36433730297296
4.19329852374788,4.22511760045336
4.21906075286110,4.16504345800685
*LWPOLYLINE
4.36259077393507,4.27666982034444
4.36937677612429,4.32430005157207
4.33921385123555,4.35158796849049
4.31052320818271,4.35158796849049
4.31052320818271,4.27666982034444
4.36259077393507,4.27666982034444
*LWPOLYLINE
4.31052320818271,4.19573889421937
4.34552791204468,4.19573889421937
4.36257753649969,4.23301121994385
4.36257753649969,4.27646982034445
4.31052320818271,4.27646982034445
4.31052320818271,4.19573889421937
*LWPOLYLINE
4.33352911275056,4.09094443950133
4.40527576990956,4.09730172803274
4.41776206600470,4.16795090854948
4.39868727174582,4.25505862927012
4.36275584323242,4.23292022386627
4.34568964310298,4.19561166192214
4.33352911275056,4.09094443950133
*LWPOLYLINE
4.31052320818271,4.05442818404539
4.33347370850606,4.09073874667933
4.43778643786573,4.09998163191325
4.40148813469786,4.03434848913693
4.35623758244536,4.00010000000000
4.31052320818271,4.00010000000000
4.31052320818271,4.05442818404539
*LWPOLYLINE
4.36953722810525,4.32442459329691
4.42539547459422,4.30179850232030
4.41123215548917,4.37245263565760
4.37420747212377,4.39189929976049
4.33939202636619,4.35169647636458
4.36953722810525,4.32442459329691
*LWPOLYLINE
4.31062320818271,4.35205115574965
4.37403447286238,4.39216690317588
4.41764915321658,4.46917021343777
4.38569155561382,4.58480232889874
4.31062320818271,4.58480232889874
4.31062320818271,4.35205115574965
*LWPOLYLINE
4.22759949319632,4.36465578169424
4.31032320818271,4.35180470290758
4.31032320818271,4.58491515263151
4.19834031926404,4.60033175402501
4.17251957393923,4.43518261836368
4.22759949319632,4.36465578169424
*LWPOLYLINE
4.17232849754715,4.43525523404666
4.19814333409938,4.60036657727902
4.10354574721040,4.62099313838669
4.07602640740360,4.57974014281445
4.03299792598320,4.43525523404666
4.17232849754715,4.43525523404666
*LWPOLYLINE
4.22728485304386,4.36418881483931
4.03527117803033,4.31621553982319
4.11729854723472,4.25473371858944
4.21353741863553,4.31484524247735
4.22728485304386,4.36418881483931
*LWPOLYLINE
4.11718311704240,4.25432034999073
4.03455329440251,4.31625372702571
3.96124860091360,4.31625372702571
3.97093791546550,4.19932134916862
4.05354292275763,4.12364758421215
4.11718311704240,4.17349632407477
4.11718311704240,4.25432034999073
*LWPOLYLINE
3.93956570809263,4.48478626351437
3.88234525318913,4.48478626351437
3.82446303937897,4.14275598124846
3.89321537135628,4.14275598124846
3.97052918511876,4.19941712452526
3.96192869317652,4.30771427189215
3.93956570809263,4.48478626351437
*LWPOLYLINE
3.94003319346022,4.48507516549220
3.95894349439777,4.56410496989965
4.07514365953801,4.57782706165503
4.03267940507601,4.43523676496552
3.96126626939233,4.31694988930644
3.94003319346022,4.48507516549220
*LWPOLYLINE
3.70270743467582,4.16831812278746
3.80175065631635,4.38690041469040
3.86537422076594,4.38690041469040
3.82402679852944,4.14257543871589
3.70270743467582,4.16831812278746
*LWPOLYLINE
3.59891417229349,4.34220972332205
3.48953089662693,4.38995825178166
3.52091045824192,4.59650099865993
3.59891417229349,4.59298998862250
3.59891417229349,4.34220972332205
*LWPOLYLINE
3.20276824883564,4.55240062142044
3.10204970822093,4.57317428296112
3.07403641909838,4.41552050974073
3.06692278068257,4.22503641281721
3.17801980142012,4.36690441917616
3.20276824883564,4.55240062142044
*LWPOLYLINE
3.47251224345729,4.30873427851577
3.49716567508887,4.44356348237026
3.45505135905448,4.44356348237026
3.40296101630259,4.40237086172714
3.47251224345729,4.30873427851577
*LWPOLYLINE
3.41008399618866,4.20849946964278
3.43236791484283,4.35366599552178
3.47247275760171,4.30844792169483
3.47659725564639,4.26516802640081
3.45185351748739,4.20849946964278
3.41008399618866,4.20849946964278
*LWPOLYLINE
3.39578962151362,4.11142984925555
3.40451941003293,4.17224808524935
3.42822526956245,4.20829946964278
3.45181897062456,4.20829946964278
3.45181897062456,4.17952401832792
3.43634915020659,4.13417410498461
3.39578962151362,4.11142984925555
*LWPOLYLINE
3.39117359693832,4.07732113675551
3.40466918886140,4.10915165814677
3.43643767807457,4.13373111711144
3.45393102157891,4.12110494393085
3.43006585483396,4.06636252321703
3.39117359693832,4.07732113675551
*LWPOLYLINE
3.25473356091983,4.17248438207034
3.43200948856834,4.35330827477812
3.40425195361714,4.17248438207034
3.25473356091983,4.17248438207034
*LWPOLYLINE
3.49485001190661,4.64020095897192
3.52676624779614,4.66489473037194
3.54522448594857,4.65157212503561
3.49922090340747,4.55004505088534
3.48282163222290,4.55004505088534
3.49485001190661,4.64020095897192
*LWPOLYLINE
4.36878708025881,4.66413774981748
4.42948017303094,4.66413774981748
4.37415211875937,4.78826969373639
4.31056330160467,4.72374246688558
4.36878708025881,4.66413774981748
*LWPOLYLINE
4.31052320818271,4.58510232889874
4.31052320818271,4.72349729466726
4.36865331934547,4.66398846667492
4.38571983084836,4.58510232889874
4.31052320818271,4.58510232889874
*LWPOLYLINE
4.31032320818271,4.95272799896938
4.31032320818271,4.58511703901788
4.19836005468628,4.60053092345041
4.21174596418940,4.95272799896938
4.31032320818271,4.95272799896938
*LWPOLYLINE
4.19817761102765,4.68351263302746
4.21154460432080,4.95272799896938
4.12944301874233,4.95272799896938
4.12944301874233,4.83806839337177
4.19817761102765,4.68351263302746
*LWPOLYLINE
4.12932328407340,4.83784544248590
4.06398535415515,4.74505517308458
4.10357809266219,4.62119078478295
4.19815668681091,4.60056836495341
4.19815668681091,4.68306749817193
4.12932328407340,4.83784544248590
*LWPOLYLINE
3.92498378065441,4.73793909422896
4.06382119695753,4.74516942548855
4.12924301874233,4.83807883470510
4.12924301874233,4.95272799896938
3.96133277649732,4.95272799896938
3.92498378065441,4.73793909422896
*LWPOLYLINE
3.88244679194195,4.48538626351437
3.93959351860634,4.48538626351437
3.95847452729575,4.56429364995242
3.92488557047997,4.73616014458930
3.88244679194195,4.48538626351437
*LWPOLYLINE
4.10317066110634,4.62115165947040
4.06365961737533,4.74476046874815
3.92522507493059,4.73755111822653
3.95902178027659,4.56462162506156
4.07576074452179,4.58006269529335
4.10317066110634,4.62115165947040
*LWPOLYLINE
3.86523906956271,4.38730041469040
3.80178313813876,4.38730041469040
3.72767896219561,4.44078659694200
3.78953958458034,4.73753273957938
3.92450932533699,4.73753273957938
3.86523906956271,4.38730041469040
*LWPOLYLINE
3.88852605544234,4.96492515095167
3.96116629627475,4.95294287347707
4.00297709717145,5.20000598822533
3.91300923365304,5.20000598822533
3.88852605544234,4.96492515095167
*LWPOLYLINE
3.96136662274826,4.95292799896938
4.12327911974508,4.95292799896938
4.18242781330427,5.15691410871862
4.05238625563083,5.29905772956403
4.01994259134263,5.29905772956403
3.96136662274826,4.95292799896938
*LWPOLYLINE
4.12348735800350,4.95292799896938
4.18261461592929,5.15684018364600
4.26489584889612,5.15684018364600
4.31029849355830,4.95292799896938
4.12348735800350,4.95292799896938
*LWPOLYLINE
4.36259377040466,4.97425391954020
4.37684639467185,5.02749756826032
4.37408565537512,5.19159675855934
4.26163843261336,5.17832617500710
4.31049569054649,4.95296564302607
4.36259377040466,4.97425391954020
*LWPOLYLINE
3.49495632361725,4.64066252262475
3.49495632361725,4.70313847542868
3.51861192446253,4.73911342744715
3.55828154272197,4.73911342744715
3.54988322272156,4.68315977370685
3.49495632361725,4.64066252262475
*LWPOLYLINE
3.50158379602571,4.73941342744715
3.51630247822351,4.81866665203619
3.55252200421165,4.81866665203619
3.56692754402613,4.79604354226515
3.55842769112807,4.73941342744715
3.50158379602571,4.73941342744715
*LWPOLYLINE
3.51633962165149,4.81886665203619
3.53521997557355,4.92052853382673
3.57931157367530,4.92052853382670
3.56919946287083,4.81886665203619
3.51633962165149,4.81886665203619
*LWPOLYLINE
3.57933683439159,4.92072853382670
3.58799564313480,4.97447744017463
3.54543217184332,4.97447744017463
3.53525754323151,4.92072853382670
3.57933683439159,4.92072853382670
*LWPOLYLINE
3.54546597389776,4.97467744017463
3.55890568539438,5.06160926945001
3.57327698289602,5.08075900868970
3.60511732685321,5.08075900868970
3.58802786261360,4.97467744017463
3.54546597389776,4.97467744017463
*LWPOLYLINE
3.57964751642596,4.92139957770750
3.60532322084864,5.08077958867203
3.65466404787378,5.09431347641158
3.57964751642596,4.92139957770750
*LWPOLYLINE
3.58562095724409,5.22921233566340
3.63498845785638,5.17620798261217
3.65679863771096,5.32277585304710
3.64223307288098,5.34304918227696
3.60258602762734,5.34304918227696
3.58562095724409,5.22921233566340
*LWPOLYLINE
3.54584932582928,4.65156803165770
3.54584932582928,4.59627939135646
3.59905261452392,4.59388466845252
3.69356721493460,4.73762053198258
3.56742787343055,4.79533471126037
3.54584932582928,4.65156803165770
*LWPOLYLINE
3.46846285336630,4.64041816129793
3.39515511110192,4.70117974220491
3.48803493185890,4.97345774601286
3.54484641763022,4.97345774601286
3.49465994322889,4.70322703693115
3.46846285336630,4.64041816129793
*LWPOLYLINE
3.20326840071251,4.55226763781197
3.39502959512535,4.70063435356797
3.49166073092669,4.62054103197923
3.35764925338425,4.29305310378683
3.17843478021203,4.36716423459531
3.20326840071251,4.55226763781197
*LWPOLYLINE
3.20289113285824,4.92962618912713
3.12854584022270,4.71536149034050
3.20289113285824,4.71536149034050
3.20289113285824,4.92962618912713
*LWPOLYLINE
3.20279113285824,4.55280432106541
3.10212142724305,4.57356791016317
3.12857137131896,4.71506149034050
3.20279113285824,4.71506149034050
3.20279113285824,4.55280432106541
*LWPOLYLINE
3.61723920430966,5.44272989087287
3.58542160840932,5.22923152615665
3.48822651566485,5.14726269743610
3.61723920430966,5.44272989087287
*LWPOLYLINE
3.34527762106828,5.31746503810427
3.23229827635164,5.30618989324967
3.18107767353514,5.01792951563667
3.26042618370513,5.01792951563667
3.34527762106828,5.14696983922863
3.34527762106828,5.31746503810427
*LWPOLYLINE
3.20288328004796,4.93041944934796
3.16552812633427,4.93041944934796
3.18100659806755,5.01752951563667
3.26016316069030,5.01752951563667
3.20288328004796,4.93041944934796
*LWPOLYLINE
3.88859835091825,4.96450782012216
3.78975401749732,4.73813273957938
3.92461086408981,4.73813273957938
3.96090221715552,4.95258102888616
3.88859835091825,4.96450782012216
*LWPOLYLINE
3.69440348645742,4.93268939236889
3.75595576954475,5.05571649820743
3.75595576954475,5.20419621493540
3.72707278902013,5.31950168879134
3.65671582679236,5.31950168879134
3.63536216285914,5.17600167780829
3.69440348645742,4.93268939236889
*LWPOLYLINE
3.54509171531070,4.97487468039859
3.48826338587175,4.97426203405607
3.48826338587175,5.14676974581768
3.58404575972444,5.22684038214844
3.54509171531070,4.97487468039859
*LWPOLYLINE
3.58568917349986,5.22869892486808
3.63487478641827,5.17588985898801
3.65228436911073,5.10414408678495
3.58054113864363,5.13381229294965
3.58568917349986,5.22869892486808
*LWPOLYLINE
3.65257150332855,5.10380892085679
3.58033375524785,5.13368162646229
3.56585331910648,5.10720302841630
3.60523472589956,5.08085900868970
3.65257150332855,5.10380892085679
*LWPOLYLINE
4.32739230399973,5.48182390138154
4.21438026238399,5.45703701393014
4.31050208600825,5.85837641183560
4.31565783686730,5.85837641183559
4.38772898476718,5.81572152413248
4.32739230399973,5.48182390138154
*LWPOLYLINE
4.18260472402625,5.15716517853389
4.31023199367129,5.19186430579583
4.32726369246953,5.48148856199591
4.21434453454946,5.45672204668962
4.05270865442187,5.29914977174769
4.18260472402625,5.15716517853389
*LWPOLYLINE
3.93815885454190,5.20030598822532
4.00292644469530,5.20030598822532
4.07765647102125,5.64189124068020
3.89277100291937,5.67864025870085
3.93815885454190,5.20030598822532
*LWPOLYLINE
4.02009478257159,5.29935772956403
4.05234894919256,5.29935772956403
4.21406482708605,5.45700799108885
4.31016965149726,5.85827641183560
4.11468129244261,5.85827641183560
4.02009478257159,5.29935772956403
*LWPOLYLINE
3.75655576954475,5.05594563793556
3.75655576954475,5.20421355035327
3.79060468956508,5.46279316509759
3.91271142690348,5.46279316509759
3.89758481054240,5.05594563793556
3.75655576954475,5.05594563793556
*LWPOLYLINE
3.34569069379188,5.14710997478261
3.36411152601517,5.43784978216816
3.43853880300011,5.62342932231688
3.54980058363257,5.62342932231688
3.63050457153249,5.48740809752436
3.48783037148108,5.14710997478261
3.34569069379188,5.14710997478261
*LWPOLYLINE
3.23237099439828,5.30659913739033
3.31432210523412,5.31477771771390
3.43815781295029,5.62355394362107
3.30470725125866,5.71369463355953
3.23237099439828,5.30659913739033
*LWPOLYLINE
3.64412180776149,5.68386099047292
3.63404833536475,5.74082720830611
3.66784789010353,5.78263777382878
3.73279409000345,5.78263777382878
3.72330692709505,5.74609033094007
3.64412180776149,5.68386099047292
*LWPOLYLINE
3.63377258017220,5.67547345654294
3.72322397424787,5.74577077129152
3.69485073319520,5.63646839955485
3.63367896367438,5.65274943027006
3.63377258017220,5.67547345654294
*LWPOLYLINE
3.63525680583847,5.49913473462130
3.63525680583847,5.56803345190946
3.66302772201350,5.60923291377981
3.68660001923064,5.60508213296636
3.65828881759427,5.49601875596880
3.63525680583847,5.49913473462130
*LWPOLYLINE
3.66523684596948,5.44520512718298
3.66849205408468,5.49189587400330
3.63519299182195,5.49872786294714
3.61772537806805,5.44366984411078
3.66523684596948,5.44520512718298
*LWPOLYLINE
3.60284784829292,5.34344918227696
3.61262426632170,5.40904965279851
3.64616074581999,5.44408844210745
3.66504519420718,5.44469867317834
3.64204486660334,5.34344918227696
3.60284784829292,5.34344918227696
*LWPOLYLINE
3.80148618114159,5.84579546158557
3.74804153758786,5.84018159440642
3.65871346280925,5.49606262619102
3.73958643613994,5.51396316831246
3.80148618114159,5.67892507882871
3.80148618114159,5.84579546158557
*LWPOLYLINE
3.91280291239974,5.46329316509759
3.89236460118339,5.67868879048932
3.80182475053611,5.67868879048932
3.73996803602421,5.51384155559573
3.79042455224790,5.46329316509759
3.91280291239974,5.46329316509759
*LWPOLYLINE
3.65706084681752,5.32074440647165
3.66941317811542,5.49791881525282
3.73963960383812,5.51346283496565
3.79002487796957,5.46298581628164
3.77111546528809,5.31938100757402
3.65706084681752,5.32074440647165
*LWPOLYLINE
4.47149780423610,5.28384898898562
4.52326896434635,5.60899418820885
4.36587871695679,5.64088496034571
4.31442125742930,5.25425320241470
4.47149780423610,5.28384898898562
*LWPOLYLINE
4.31549201368841,5.85852812835310
4.34402219862717,5.96510858092956
4.33850639322852,6.08918616684048
4.15892899338461,6.08918616684048
4.14045443613202,5.85867641183559
4.31549201368841,5.85852812835310
*LWPOLYLINE
4.33863941340434,6.08948616684048
4.42595223168200,6.24364013474934
4.36720436817901,6.51192048511651
4.24814613011528,6.51192048511651
4.15371426485739,6.08948616684048
4.33863941340434,6.08948616684048
*LWPOLYLINE
4.06729337226599,6.24801728426031
4.18894055941552,6.24801728426031
4.22498029495064,6.51179246519720
4.16634022708059,6.46660759435473
4.06729337226599,6.24801728426031
*LWPOLYLINE
3.94336269669208,6.10411506454961
4.06718411025768,6.24781728426030
4.18890232915471,6.24781728426030
4.15598542563144,6.10411506454961
3.94336269669208,6.10411506454961
*LWPOLYLINE
3.89294652206423,5.67921710900744
3.89294652206423,5.70364338039732
4.04150591166499,6.10361506454961
4.15559172935026,6.10361506454961
4.07756038454761,5.64252207705650
3.89294652206423,5.67921710900744
*LWPOLYLINE
3.80191763271191,5.67915936330656
3.83814990681065,6.00368184355926
3.91329684696678,6.10381506454961
4.04094014639480,6.10381506454961
3.89239478017752,5.70388113604726
3.80191763271191,5.67915936330656
*LWPOLYLINE
3.74813631763544,5.84059375083636
3.78337680230550,6.00449684142451
3.83770697072710,6.00356252917717
3.80152326826919,5.84620155790605
3.74813631763544,5.84059375083636
*LWPOLYLINE
3.70792156350576,6.12525933118821
3.78325117946616,6.12525933118821
3.78598190231125,6.17661256459523
3.75612289798348,6.18896025357580
3.70976136296250,6.18896025357580
3.70792156350576,6.12525933118821
*LWPOLYLINE
3.70976713932927,6.18916025357580
3.71108406654151,6.23475733092555
3.76031966886306,6.28286547408146
3.80764342780031,6.29006242424918
3.78836819601939,6.18916025357580
3.70976713932927,6.18916025357580
*LWPOLYLINE
3.77986905202772,6.29725428480460
3.79959059606117,6.39842780939047
3.81806054644658,6.39842780939047
3.84883795035206,6.37578870788943
3.82184855870450,6.29029538938973
3.77986905202772,6.29725428480460
*LWPOLYLINE
3.79960502115481,6.39862780939047
3.79655215120196,6.49291115036375
3.82243171354306,6.50028405075825
3.88063374402673,6.47650709202627
3.85604802788920,6.39862780939047
3.79960502115481,6.39862780939047
*LWPOLYLINE
3.84493849774912,6.50038969118097
3.83424682709085,6.55117540222978
3.81086580961926,6.55433859752891
3.79537815834145,6.51306423453874
3.79605456091144,6.50038969118097
3.84493849774912,6.50038969118097
*LWPOLYLINE
3.96398111433847,6.42121588292236
4.09192088460462,6.52020360349371
4.16613459501650,6.46663836253208
4.06708710762407,6.24804665637732
3.94747652614959,6.29750960037300
3.96398111433847,6.42121588292236
*LWPOLYLINE
3.71104561986736,6.23499938767282
3.78392414328479,6.31910997334171
3.79820516895143,6.43567892121106
3.79528127627286,6.51297991304654
3.64696363964897,6.53939044448923
3.71104561986736,6.23499938767282
*LWPOLYLINE
3.41389284912590,6.31185102435821
3.50643563794243,6.55847619619487
3.46417453273298,6.61170707364184
3.41389284912590,6.31185102435821
*LWPOLYLINE
3.47573612307279,6.01996339860054
3.52208112146109,6.23470061305992
3.39718703530901,6.23470061305992
3.37037117579984,6.01996339860054
3.47573612307279,6.01996339860054
*LWPOLYLINE
3.71073336941509,6.23500061305992
3.64267325474323,6.52736828763596
3.50668080874912,6.55825904906432
3.39737749615035,6.23500061305992
3.71073336941509,6.23500061305992
*LWPOLYLINE
3.43860352873513,5.62382932231688
3.43860352873513,5.84648935432521
3.50673271895670,6.16216252382189
3.57606498021741,6.23460061305992
3.71077941514418,6.23460061305992
3.69915671256814,5.83217801639050
3.54981176015587,5.62382932231688
3.43860352873513,5.62382932231688
*LWPOLYLINE
3.43820352873513,5.62400576477632
3.30478383047334,5.71412560766231
3.34475152814791,5.93905665084544
3.43820352873513,5.84642732973995
3.43820352873513,5.62400576477632
*LWPOLYLINE
3.34484909589123,5.93952314301290
3.37040405793710,6.01966339860054
3.47556907404738,6.01966339860054
3.43828504555639,5.84690973152951
3.34484909589123,5.93952314301290
*LWPOLYLINE
3.77753615186313,6.01213438235912
3.78627774487075,6.17652641023419
3.87290985006373,6.20227219060052
3.91296889877772,6.10404447362589
3.83786768803317,6.00397218702975
3.77753615186313,6.01213438235912
*LWPOLYLINE
3.69178292257322,5.78294437888022
3.69954757669804,5.83204935456617
3.71496608837847,5.86286697453470
3.73331792152152,5.86286697453470
3.74765687247186,5.84034843892072
3.72297001411849,5.78381014932253
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3.70256407528486,5.93564019668685
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3.73332713725502,5.86326697453470
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3.70368927001930,5.97525725002877
3.73780091966341,5.96512885632521
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3.78313508559977,6.12495933118821
3.77679783561743,6.00578272632438
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4.27801453951783,6.82342464862857
4.22534906846164,6.51222048511651
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4.05877841818914,6.84332980253022
3.94960232722784,6.84332980253022
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4.02500140612684,6.76616645447037
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3.96398742604912,6.67301362609758
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3.88057368179607,6.84332980253022
3.90423822951823,6.84332980253022
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3.90126042554897,6.76899036902086
3.90726268766642,6.75572175551396
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3.83416531630784,6.72120867918063
3.82831070582411,6.68970834014341
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3.87047366968090,6.66042016604398
3.83410950790554,6.55139580202287
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3.74834764674381,6.84322980253022
3.85653886002316,6.84322980253022
3.79521779699269,6.51329593571699
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3.90726939294019,7.14131318136821
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3.61350821491042,7.34383416471193
3.59426300839889,7.34383416471193
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3.86586154655211,7.19618346223794
3.64683525095994,6.53951487935273
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3.88777821484259,6.92278302711927
3.93055950465981,6.92278302711927
4.05877841818914,6.90009821083212
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3.91455699915105,7.06242269373892
4.05877841818914,7.01142285223170
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3.90183282212957,7.07875282697486
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3.99762656888708,7.18507538377278
4.00000982801338,7.22042141827400
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3.92220016066262,7.18507538377278
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4.35933248867942,7.30393842434987
4.44399532583850,7.80421739063009
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3.59429854613269,7.34403416471193
3.61351107514527,7.34403416471193
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3.66743910354104,7.75565612029247
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3.71937408245376,7.19648346223794
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3.66750071033545,7.75600283229589
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3.74975101349167,8.04962620289442
3.71967425623731,8.04962620289442
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3.94203588189411,7.82074773543377
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4.02250565929859,7.76885656443523
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3.99860358960686,7.59870745170233
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3.98478625524679,7.04863674067091
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3.97187051824397,7.41182659089182
3.98731186896914,7.49496162725019
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3.93605744093220,7.25548811333612
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3.94172818618262,7.82077493582878
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4.15128111402263,4.00020000000000
*LWPOLYLINE
4.16717282541736,4.28553185646001
4.11728311704240,4.25437036887095
4.11728311704240,4.17344762776079
4.16724552965476,4.11146426960601
4.21893087858547,4.16483885877295
4.16717282541736,4.28553185646001

 Jan Stránský (honzik) said on 2019-10-16: #2

Hi,

> 'ring.txt' is in first comment. I really sorry for putting all of the coordinates!

no need to sorry, thanks for following our instructions [1] :-)

> 1- When the polyhedrons are coming down, no force is applied on them! why? Must be weight force on all the particles.

How do you know that "no force is applied on them"?
They are coming down (accelerating downwards) just because there is "weight force on all the particles"..

> 2- All the particles move down same as a block, non of them act lonely, even those particles that are on the sides and are completely free to fall down.

yes, it is a free fall. Do you want them to behave differently? Why? How?

> 3- Particles move down very very very slow! Why?

because:
- their real velocity is low
- time step of the simulation is low
- polyhedrons contact evaluation takes long time (compared e.g. to spheres).
Overall, you have "slow" simulation.

> For saving time, when the particles are moving down, I increase the gravity to 100000 (with simulation inspect window) for fast movement and when they are near the ground, I set real gravity.

Not a good idea, by higher gravity, the particles get higher acceleration and higher velocity than in the real case. Better idea is to increase time step for the phase with no collisions.

> But when the lower particles reach the ground the whole particles stop moving and nothing happens! they have to place in form of a pile.

Please be more specific what "nothing happens" mean and how you observe that "nothing happens".
I could not reproduce it, have tried your code and after reaching ground the simulation continues normally..

cheers
Jan

 Ali Rafiee (ali-rafiee) said on 2019-10-16: #3

Hi,
as I can see from your model, in fact you are trying to model the "block caving".
if you want to model it, that will be very difficult with polyhedra in Yade, as you will have large number of polyhedra in your model, and it is very time consuming, as I know.

but for just a simple model, it will be better to use stl format for your boundary as facet objects in Yade, and put your polyhedrons inside.

another solution will be to use DFN method with spheres for which Yade is more adapted.

good luck
Ali

 Mahdeyeh (mahdiye.sky) said on 2019-10-16: #4

Dear Jan

> no need to sorry, thanks for following our instructions [1] :-)
I try my best but for following your instructins, but you know sometimes does not work! believe this! ;-)

> How do you know that "no force is applied on them"?
I check forces on bodies in simulation inspect window. before touching the ground, non of particles do not have force.

> it is a free fall. Do you want them to behave differently? Why? How?
why a particle (for example) which is on a side and is completely free, does not fall freely? apart of the others?

> - time step of the simulation is low
If I increase time step, model will explode. (I checked! Particles do not have overlap.)

> Better idea is to increase time step for the phase with no collisions.
I do not understand your mean about the phase with no collisions (I am an amateur) ! When should increase time step?

I really appreciate your kindness Jan.

Best regards,
Mahdeyeh

 Bruno Chareyre (bruno-chareyre) said on 2019-10-16: #5

> particles do not have force

That's because gravity is an acceleration, not a force... ;-)
Newtons law is really calculated like this in Newton: accel = gravity + force/mass

> time step of the simulation is low

It depends on stiffness and density.

Bruno

 Jan Stránský (honzik) said on 2019-10-16: #6

Hello,

>> it is a free fall. Do you want them to behave differently? Why? How?
> why a particle (for example) which is on a side and is completely free, does not fall freely? apart of the others?

This I did not get it. I have tried it, and all particles (dark green in Yade GUI) falls uniformly. Is this wrong?
Please be more specific what "on a side" and "completely free" mean.. From my point of view, all dark green particles are "completely free" (before touching the ground)..

>> - time step of the simulation is low
> If I increase time step, model will explode. (I checked! Particles do not have overlap.)

I did not mean to increase it, it is just a feature of explicit time integration.
As Bruno said, its critical value depends on stiffness and density. Without hacking the physics of the problem (changing density or stiffness), there is no way how to improve this..

>> Better idea is to increase time step for the phase with no collisions.
> I do not understand your mean about the phase with no collisions (I am an amateur) ! When should increase time step?

phase with no collisions = the free fall phase (all bodies fall uniformly)
You do the same as you describe:
> For saving time, when the particles are moving down, I increase the gravity to 100000 (with simulation inspect window) for fast movement and when they are near the ground, I set real gravity.

but instead of increasing gravity, you increase time step and near the ground you set it to stable value.

cheers
Jan

 Mahdeyeh (mahdiye.sky) said on 2019-10-16: #7

Dear Jan and Bruno

Same as all the time, you guys are the best.
Thank you very much.

Best regards,
Mahdeyeh

 Mahdeyeh (mahdiye.sky) said on 2019-10-16: #8

Thanks Jan Stránský, that solved my question.