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[Nait <question212185@xxxxxxxxxxxxxxxxxxxxx>]

New question #212185 on Yade:
https://answers.launchpad.net/yade/+question/212185

Hi,

I have two questions about generating a package using gravity deposition:

1. How can I get a particle package with prescribed after gravity deposition?
I have tried using the following script, but there will be a large compression due to gravity deposition in the package.

##SCRIPT

from yade import pack

num_spheres = 30000
rr = 0.2
compFricDegree = 30
finalFricDegree = 30 

damp=0.7

stabilityThreshold=0.01

young=5e6
mn,mx=Vector3(0,0,0),Vector3(20,80,50)

thick = 0.01

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=utils.aabbWalls([mn,mx],thickness=thick,material='walls')
wallIds=O.bodies.append(walls)

sp=pack.SpherePack()
sp.makeCloud(mn,mx,rRelFuzz=rr,num=num_spheres,porosity=0.35)
O.bodies.append([utils.sphere(center,rad,material='spheres') for center,rad in sp])


O.dt=.5*utils.PWaveTimeStep()
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()]
   ),
   GravityEngine(gravity=(0,0,-9.81)),
   NewtonIntegrator(damping=0.4),
]

O.run(2000, True)

while 1:
  O.run(500, True)
  unb=unbalancedForce()
  print 'unbalanced force:',unb
  if unb<0.1:
    break

yade.qt.Controller(), yade.qt.View()

How should I modify my script if I want to:
(1) generate a sample which can fill the whole box; and
(2) has the prescribed porosity, i.e. 0.35

2. How can I get the stress the particles apply on the boundaries after the gravity deposition finishes?

Many thanks.

Nait

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