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[Man Yick <question695791@xxxxxxxxxxxxxxxxxxxxx>]

New question #695791 on Yade:
https://answers.launchpad.net/yade/+question/695791

Dear All,
I have a problem in simulating spherical particles' gravity deposition in 2D. I use state.blockedDOFs="yXZ" to fix all the particles in y plane. But I found that
1) all the particels fall together (i.e. free falling and no particles collision),
2) the wall disappears (does not prevent particles go through),
3) no packing occurs.

I modified the tutorial example 02-gravity-deposition.py into my input file. It reads:

from yade import pack, plot

O.bodies.append(geom.facetBox((500,100,100),(500,100,100),wallMask=31))

sp=pack.SpherePack()
sp.makeCloud((0,100,0),(1000,100,200),rMean=15,rRelFuzz=.3)
sp.toSimulation()

O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
	InteractionLoop(
		# handle sphere+sphere and facet+sphere collisions
		[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
		[Ip2_FrictMat_FrictMat_FrictPhys()],
		[Law2_ScGeom_FrictPhys_CundallStrack()]
	),
	NewtonIntegrator(gravity=(0,0,-9.81),damping=0.4),
	PyRunner(command='checkUnbalanced()',realPeriod=2),
	PyRunner(command='addPlotData()',iterPeriod=100)
]
O.dt=.05*PWaveTimeStep()

#Block the "flat" axis (Y), and only allow rotations around it.
for i in O.bodies:
        i.state.blockedDOFs="yXZ"

O.trackEnergy=True


def checkUnbalanced():
	if unbalancedForce()<.005:
		O.pause()
		plot.saveDataTxt('bbb.txt.bz2')

# collect history of data which will be plotted
def addPlotData():
	plot.addData(i=O.iter,unbalanced=unbalancedForce(),**O.energy)

plot.plots={'i':('unbalanced',None,O.energy.keys)}

plot.plot()

O.saveTmp()


Is there any problme in my input file ?
Many thanks for your help.
Best regards,
Man Yick

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