yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

2010/10/26 Václav Šmilauer <eu@xxxxxxxx>

> Moving the discussion back to the bug tracker...
>
> Chiara: misunderstanding, sorry, I meant that the prevous
> Ig2_Facet_Sphere_ScGeom did not work for facets because the shift2
> parameter was disregarded. Otherwise it should work with facets just
> fine, as well as any other shapes.
>
Ok, sorry :-)

>
> For getting periodicity &c in the contact law: please use
> Cell::intrShiftPos (computes the shift2, which moves id2 to the period
> of id1) and Cell::intrShiftVel (computes the velocity delta that must be
> added to id2's velocity so that they are as if in the same period). It
> takes care of possible ways of accounting for velGrad
> (Cell::homoDeform).
>
Ok then I will update my law, I missed these introductions. Thanks!
Chiara

>
> --
> periodic boundary don't work with ViscEl classes
> https://bugs.launchpad.net/bugs/666246
> You received this bug notification because you are a member of Yade
> developers, which is subscribed to Yade.
>
> Status in Yet Another Dynamic Engine: Fix Committed
>
> Bug description:
> Periodic boundary don't work with Ig2_Facet_Sphere_ScGeom and
> Ig2_Sphere_Sphere_ScGeom functors.
>
>
> #=============BEGIN SCRIPT TEST PERIODIC WITH
> Ig2_Sphere_Sphere_ScGeom==========
> # -*- coding: utf-8
>
> from yade import utils
>
> sphereRadius=0.1
> tc=0.001# collision time
> en=0.3  # normal restitution coefficient
> es=0.3  # tangential restitution coefficient
> density=2700
> frictionAngle=radians(35)#
> params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
>
> sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))
>
>
> # Spheres
> sphId=O.bodies.append([
>        utils.sphere( (i*0.2+0.1,0.5,0.2), 0.1, material=sphereMat) for i in
> range(5)
>        ])
> O.bodies[sphId[-1]].state.vel=(0.5,0.5,0)
>
> ## Engines
> O.engines=[
>        ForceResetter(),
>        InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
>        InteractionLoop(
>                [Ig2_Sphere_Sphere_ScGeom()],
>                [Ip2_ViscElMat_ViscElMat_ViscElPhys()],
>                [Law2_ScGeom_ViscElPhys_Basic()],
>        ),
>        NewtonIntegrator(damping=0),
> ]
>
> O.periodic=True
> O.cell.refSize=Vector3(1,1,1)
>
> O.dt=.01*tc
>
> O.saveTmp()
> #==========================END======================
>
>
> #=============BEGIN SCRIPT TEST PERIODIC WITH
> Ig2_Facet_Sphere_ScGeom==========
> # -*- coding: utf-8
>
> from yade import utils
>
> sphereRadius=0.1
> tc=0.001# collision time
> en=0.3  # normal restitution coefficient
> es=0.3  # tangential restitution coefficient
> density=2700
> frictionAngle=radians(35)#
> params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
>
> facetMat=O.materials.append(ViscElMat(frictionAngle=frictionAngle,**params))
>
> sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))
>
> floor
> n=5.
> s=1./n
> for i in range(0,n):
>        for j in range(0,n):
>                O.bodies.append([
>                        utils.facet(
> [(i*s,j*s,0.1),(i*s,(j+1)*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
>                        utils.facet(
> [(i*s,j*s,0.1),((i+1)*s,j*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
>                ])
>
> # Spheres
> sphId=O.bodies.append([
>        utils.sphere( (0.5,0.5,0.2), 0.1, material=sphereMat),
>        ])
> O.bodies[sphId[-1]].state.vel=(0.5,0,0)
>
> ## Engines
> O.engines=[
>        ForceResetter(),
>        InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
>        InteractionLoop(
>                [Ig2_Facet_Sphere_ScGeom()],
>                [Ip2_ViscElMat_ViscElMat_ViscElPhys()],
>                [Law2_ScGeom_ViscElPhys_Basic()],
>        ),
>        GravityEngine(gravity=[0,0,-9.81]),
>        NewtonIntegrator(damping=0),
> ]
>
> O.periodic=True
> O.cell.refSize=Vector3(1,1,1)
>
> O.dt=.01*tc
>
> O.saveTmp()
> #==========================END======================
>
>
>
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-- 
periodic boundary don't work with ViscEl classes
https://bugs.launchpad.net/bugs/666246
You received this bug notification because you are a member of Yade
developers, which is subscribed to Yade.

Status in Yet Another Dynamic Engine: Fix Committed

Bug description:
Periodic boundary don't work with Ig2_Facet_Sphere_ScGeom and Ig2_Sphere_Sphere_ScGeom functors.


#=============BEGIN SCRIPT TEST PERIODIC WITH Ig2_Sphere_Sphere_ScGeom==========
# -*- coding: utf-8

from yade import utils

sphereRadius=0.1
tc=0.001# collision time 
en=0.3  # normal restitution coefficient
es=0.3  # tangential restitution coefficient
density=2700
frictionAngle=radians(35)# 
params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))


# Spheres
sphId=O.bodies.append([
	utils.sphere( (i*0.2+0.1,0.5,0.2), 0.1, material=sphereMat) for i in range(5)
	])
O.bodies[sphId[-1]].state.vel=(0.5,0.5,0)

## Engines 
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom()],
		[Ip2_ViscElMat_ViscElMat_ViscElPhys()],
		[Law2_ScGeom_ViscElPhys_Basic()],
	),
	NewtonIntegrator(damping=0),
]

O.periodic=True
O.cell.refSize=Vector3(1,1,1)

O.dt=.01*tc

O.saveTmp()
#==========================END======================


#=============BEGIN SCRIPT TEST PERIODIC WITH Ig2_Facet_Sphere_ScGeom==========
# -*- coding: utf-8

from yade import utils

sphereRadius=0.1
tc=0.001# collision time 
en=0.3  # normal restitution coefficient
es=0.3  # tangential restitution coefficient
density=2700
frictionAngle=radians(35)# 
params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
facetMat=O.materials.append(ViscElMat(frictionAngle=frictionAngle,**params)) 
sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))

floor
n=5.
s=1./n
for i in range(0,n):
	for j in range(0,n):
		O.bodies.append([
			utils.facet( [(i*s,j*s,0.1),(i*s,(j+1)*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
			utils.facet( [(i*s,j*s,0.1),((i+1)*s,j*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
		])

# Spheres
sphId=O.bodies.append([
	utils.sphere( (0.5,0.5,0.2), 0.1, material=sphereMat),
	])
O.bodies[sphId[-1]].state.vel=(0.5,0,0)

## Engines 
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
	InteractionLoop(
		[Ig2_Facet_Sphere_ScGeom()],
		[Ip2_ViscElMat_ViscElMat_ViscElPhys()],
		[Law2_ScGeom_ViscElPhys_Basic()],
	),
	GravityEngine(gravity=[0,0,-9.81]),
	NewtonIntegrator(damping=0),
]

O.periodic=True
O.cell.refSize=Vector3(1,1,1)

O.dt=.01*tc

O.saveTmp()
#==========================END======================