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New question #679264 on Yade:
https://answers.launchpad.net/yade/+question/679264

hello 
i have create many paticles and they deposit in a box by gravity, and one side of box is consist of wall, after the deposit finished, i delete the wall and run the script again to let the particle flow. i have define the fricAngle=0.6rad, but the particles finially lay out in a layer, but not deposit with a angle as i expected.Here is my code:

from yade import polyhedra_utils,pack,plot,utils
import random

m = PolyhedraMat()
m.density = 2600  # kg/m^3
m.young = 1E7  # Pa
m.poisson = 20000 / 1E6
m.frictionAngle = 0.6  # rad\

v1=((0,0,0),(0,0,10),(100,0,10))
v2=((0,0,0),(100,0,0),(100,0,10))
v5=((100,10,0),(0,10,10),(100,10,10))
v6=((100,10,0),(0,10,10),(0,10,0))
v7=((0,0,0),(0,10,10),(0,0,10))
v8=((0,0,0),(0,10,10),(0,10,0))
v9=((0,0,0),(100,10,0),(0,10,0))
v10=((0,0,0),(100,10,0),(100,0,0))

O.bodies.append(utils.facet(v1,material=m))
O.bodies.append(utils.facet(v2,material=m))
O.bodies.append(utils.facet(v5,material=m))
O.bodies.append(utils.facet(v6,material=m))
O.bodies.append(utils.facet(v7,material=m))
O.bodies.append(utils.facet(v8,material=m))
O.bodies.append(utils.facet(v9,material=m))
O.bodies.append(utils.facet(v10,material=m))


O.bodies.append(utils.wall(10, axis=0, sense=-1, material=m))





#polyhedra_utils.fillBox((0,0,0),(10,10,20),m,seed=1)


sp=pack.SpherePack()
sp.makeCloud((0,0,0),(10,10, 0),psdSizes=[2,2,2],psdCumm=(0.5,0.8,1),seed=1)

for center,radius in sp:
    # note: new polyhedron for each cycle
    t = polyhedra_utils.polyhedra(m,(radius,radius,radius))
    t.state.pos = center # sets polyhedron position according to sphere position
    O.bodies.append(t)

O.engines = [
    ForceResetter(),
    InsertionSortCollider([Bo1_Polyhedra_Aabb(), Bo1_Wall_Aabb(), Bo1_Facet_Aabb()]),
    InteractionLoop(
        [Ig2_Wall_Polyhedra_PolyhedraGeom(), Ig2_Polyhedra_Polyhedra_PolyhedraGeom(),
         Ig2_Facet_Polyhedra_PolyhedraGeom()],
        [Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()],  # collision "physics"
        [Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()]  # contact law -- apply forces
    ),
    # GravityEngine(gravity=(0,0,-9.81)),
    NewtonIntegrator(damping=0.5, gravity=(0, 0, -9.81)),
    PyRunner(command='checkUnbalanced()', realPeriod=3, label='checker')
]
O.dt=1e-2

# enable energy tracking; any simulation parts supporting it
# can create and update arbitrary energy types, which can be
# accessed as O.energy['energyName'] subsequently
O.trackEnergy=True
# if the unbalanced forces goes below .05, the packing
# is considered stabilized, therefore we stop collected
# data history and stop
def checkUnbalanced():
   if unbalancedForce()<.05:
      O.pause()
      #plot.saveDataTxt('bbb.txt.bz2')
      # plot.saveGnuplot('bbb') is also possible

# collect history of data which will be plotted
def addPlotData():
   # each item is given a names, by which it can be the unsed in plot.plots
   # the **O.energy converts dictionary-like O.energy to plot.addData arguments
   plot.addData(i=O.iter,unbalanced=unbalancedForce(),**O.energy)

# define how to plot data: 'i' (step number) on the x-axis, unbalanced force
# on the left y-axis, all energies on the right y-axis
# (O.energy.keys is function which will be called to get all defined energies)
# None separates left and right y-axis
plot.plots={'i':('unbalanced',None,O.energy.keys)}

# show the plot on the screen, and update while the simulation runs
plot.plot()

O.saveTmp()

i would appreciate if you can help me



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