Question #210805 on Yade changed:
https://answers.launchpad.net/yade/+question/210805
Description changed to:
Hi, all
I want to add RadialForceEngine to one particle with ids=pmove (id=3) to
overcome the gravity effect, but when I define the RadialForceEngine with
ids=pmove, the particle is gone away, and form inspection, its velocity is nan,
why? Here is the code,
anybody can give me some advice, thank you!
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# -*- coding: utf-8 -*-
# encoding: utf-8
from yade import utils, ymport, qt, plot
# basic simulation showing sphere falling ball gravity,
# bouncing against another sphere representing the support
interactionRadius=1.5
iterPeriod_checkInteraction=1000
# DATA COMPONENTS
O.materials.append(FrictMat(young=8e6,poisson=0.3,frictionAngle=radians(20),density=2700,label='spheres'))
# add 2 particles to the simulation
# they the default material (utils.defaultMat)
O.bodies.append([
# fixed: particle's position in space will not change (support)
utils.sphere(center=(0,0,0),radius=.5,fixed=True),
utils.sphere(center=(0,3,0),radius=.5,fixed=True),
# this particles is free, subject to dynamics
utils.sphere((0,0,5),.5),
#utils.sphere((0,3,20),.5)
])
pmove=O.bodies.append([utils.sphere((0,3,5),.5)
])
# FUNCTIONAL COMPONENTS
# simulation loop -- see presentation for the explanation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=interactionRadius,label='aabb')]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=interactionRadius,label='Ig2ssGeom')],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
# apply gravity force to particles
#GravityEngine is deprecated
#GravityEngine(gravity=(0,0,-9.81)),
RadialForceEngine(ids=pmove,axisDir=(0,0,1),axisPt=(0,3,5),fNorm=O.bodies[3].state.mass*9.81*0.5,label="radialForce"),
# damping: numerical dissipation of energy
NewtonIntegrator(damping=0.1,gravity=(0,0,-9.81)),
PyRunner(command='checkInteraction()',iterPeriod=iterPeriod_checkInteraction,label='checker')
]
# set timestep to a fraction of the critical timestep
# the fraction is very small, so that the simulation is not too fast
# and the motion can be observed
O.dt=.5e-4*utils.PWaveTimeStep()
#### to see it
v=qt.Controller()
v=qt.View()
rr=qt.Renderer()
rr.intrAllWire=True
# save the simulation, so that it can be reloaded later, for experimentation
def checkInteraction():
print O.iter
# if O.interactions[3,1].isReal:
# i=O.interactions[3,1]
# print O.iter
# else:
# print O.iter
#run one single step
O.step()
#### initializes now the interaction detection factor
#
#aabb.aabbEnlargeFactor=-1.
#Ig2ssGeom.interactionDetectionFactor=-1.
O.saveTmp()
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