New question #707311 on Yade:
https://answers.launchpad.net/yade/+question/707311
Hello everyone!
I am a new user of Yade and I want to simulate rotational powder dropping in
the unsealed cylinder. I tried to add rotational movement on the Boxfactory
through the RotationEngine but the terminal shows “SyntaxError: invalid
syntax”. I have consulted question/647827[1], but I don’t know how to deal with
it. Could you give me some advice?
Moreover, I also encountered some problems in the process of beginning to learn
Yade, could I trouble you to answer problems?
1. In the below code, the steelID and "316lsteel" can present the defined
material. However, the description of material selection between CylinderID and
BoxFactory is different. I want to know the difference between ‘label’ and
‘id’.
2. In the below code, the material of the sphere and geometry is 316Lsteel. I
want to know the difference between frictionAngle is defined in
O.materials.append and the frictAngle in Ip2_FrictMat_FrictMat_MindlinPhys. In
the Yade document, the frictionAngle means Contact friction angle (in radians),
and frictAngle means Instance of MatchMaker determining how to compute
interaction’s friction angle.
3. In the Hertz-Mindlin model of the YADE document, the normal coefficient of
restitution(en) can be considered as equal to the shear coefficient of
restitution(es), and I would like to confirm to you that es = en = e/sqrt(2)? e
is the restitution coefficient.
4. In Boxfactory, the meaning of mask is groupMask to apply for newly created
spheres. In packs.py[2],the value of mask is 5. I am confused about whether the
value mask has the same meaning as the value wallmask in geom.factbox, i.e –
determines which walls will be created spheres, in the order -x (1), +x (2), -y
(4), +y (8), -z (16), +z (32). The numbers are ANDed; the default 63 means to
create spheres in all walls.
5. When RotationEngine is not applied to Boxfactory, the following warning
appears at the terminal when emulation begins. Could you give me some advice to
deal with it?
(1) Shop:482 static yade::Real
yade::Shop::PWaveTimeStep(boost::shared_ptr<yade::Scene>): PWaveTimeStep has
not found any suitable spherical body to calculate dt. dt is set to 1.0;
(2) InsertionSortCollider:374 virtual void
yade::InsertionSortCollider::action(): verletDist is set to 0 because no
spheres were found. It will result in suboptimal performances, consider setting
a positive verletDist in your script.
The rotational powder-dropping code is as follows:
from yade import pack, geom
steelID=
O.materials.append(FrictMat(density=7800,young=2.2e9,poisson=.3,frictionAngle=math.atan(.62),label="316lsteel"))
CylinderID=O.bodies.append(geom.facetCylinder((0,0,10), radius=10, height=20,
orientation=Quaternion((1, 0, 0), 0), wire=False,segmentsNumber=60,
dynamic=False, wallMask=6, angleRange=None, closeGap=False,
radiusBottomInner=-1,material='316lsteel'))
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Facet_Sphere_ScGeom(),Ig2_Sphere_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_MindlinPhys(en=0.636,
es=0.636,frictAngle=math.atan(.62))],
[Law2_ScGeom_MindlinPhys_Mindlin()]
),
FactoryID=BoxFactory(
maxParticles=1000,
extents=(3, 3, 3),
center=(3, 3, 10),
rMin=0.28,
rMax=0.29,
vMin=0,
vMax=0
vAngle=0,
massFlowRate=10000.,
normal=(0, 0, -1),
label='factory',
materialId=steelID
),
RotationEngine(rotationAxis=(0, 0, 1), angularVelocity=0.1,
rotateAroundZero=True, zeroPoint=(0, 0, .10),ids=FactoryID),# factory motion
NewtonIntegrator(gravity=(0,0,-9.81))
]
O.dt=.5e-4*utils.PWaveTimeStep()
O.saveTmp()
O.run()
[1] https://answers.launchpad.net/yade/+question/647827
[2] https://gitlab.com/yade-dev/trunk/blob/master/examples/packs/packs.py
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