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[Daria <question692617@xxxxxxxxxxxxxxxxxxxxx>]

New question #692617 on Yade:
https://answers.launchpad.net/yade/+question/692617

I'm trying to simulate cohesion of spheres to cylinder in flow around this cylinder

My scriptYade.py:
############


from __future__ import print_function
import sys
from yadeimport import *
from yade.wrapper import *
from yade.utils import *

initMPI()                           #Initialize the mpi environment, always required.
fluidCoupling = yade.FoamCoupling();     #Initialize the engine
fluidCoupling.getRank();            #part of Initialization.


#example of spheres in shear flow : two-way point force coupling
class simulation():

	def __init__(self):
		O.periodic = True
		O.cell.setBox(1,0.4,0.2)

		numspheres=1000
		young = 5e6
		density = 2000

		mat1 = CohFrictMat(normalCohesion=1e7, shearCohesion=1e7, young=young, poisson=0.5, frictionAngle=radians(15), density=density, label='spheremat')
		O.materials.append(mat1)
		mat2 = CohFrictMat(normalCohesion=1e7, shearCohesion=1e7, young=young, poisson=0.5, frictionAngle=radians(15), density=density, label='wallmat')
		O.materials.append(mat2)

		epsilon = 1e-08
		minval = 0 + epsilon
		maxx = 1.0 - epsilon
		maxy = 0.4 - epsilon
		maxz = 0.2 - epsilon
		#wall coords, use facets for wall BC:
		v0 = Vector3(minval, minval, minval)
		v1 = Vector3(minval,minval,maxz)
		v2 = Vector3(maxx,minval,minval)
		v3 = Vector3(maxx,minval,maxz)

		v4 = Vector3(minval,maxy,minval)
		v5 = Vector3(minval,maxy,maxz)
		v6 = Vector3(maxx,maxy,minval)
		v7 = Vector3(maxx, maxy, maxz)

		lf0 = facet(vertices=[v0,v1,v2], material='wallmat')
		O.bodies.append(lf0)
		lf1 = facet(vertices=[v1,v2,v3], material='wallmat')
		O.bodies.append(lf1)

		uf0 = facet(vertices=[v4,v5,v6], material='wallmat')
		O.bodies.append(uf0)
		uf1 = facet(vertices=[v5,v6,v7], material='wallmat')
		O.bodies.append(uf1)

		ff0 = facet(vertices=[v0,v2,v6], material='wallmat')
		O.bodies.append(ff0)
		ff1 = facet(vertices=[v0,v6,v4], material='wallmat')
		O.bodies.append(ff1)

		bf0 = facet(vertices=[v1,v3,v7], material='wallmat')
		O.bodies.append(bf0)
		bf1 = facet(vertices=[v1,v7,v5], material='wallmat')
		O.bodies.append(bf1)

		oriBody = Quaternion(Vector3(1,0,0),(0))
		O.bodies.append(geom.facetCylinder((0.5,0.2,0.1), radius=0.05, height=0.2, orientation=oriBody, segmentsNumber=100, wallMask=4,material='wallmat'))

		#spheres
		mn, mx= Vector3(minval + epsilon, minval + epsilon, minval + epsilon), Vector3(0.45, maxy - epsilon, maxz - epsilon)
		sp = pack.SpherePack();
		sp.makeCloud(mn,mx,rMean=0.001,rRelFuzz=0.1, num=numspheres)
		O.bodies.append([sphere(center,rad,material='spheremat') for center,rad in sp])
		sphereIDs = [b.id for b in O.bodies if type(b.shape)==Sphere]

		#coupling engine settings
		fluidCoupling.setNumParticles(len(sphereIDs))
		fluidCoupling.setIdList(sphereIDs)
		fluidCoupling.isGaussianInterp=False;  #use pimpleFoamYade for gaussianInterp

		# Integrator
		newton=NewtonIntegrator(damping=0.0, gravity = (0.0 ,0.0, 0.0))
		# add small damping in case of stability issues.. ~ 0.1 max, also note : If gravity is needed, set it in constant/g dir.

		O.timingEnabled==True

		O.engines=[
			ForceResetter(),
			InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Facet_Aabb()], allowBiggerThanPeriod=True),
			InteractionLoop(
				[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
				[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
				[
					Law2_ScGridCoGeom_CohFrictPhys_CundallStrack(),
					Law2_CylScGeom6D_CohFrictPhys_CohesionMoment(),
					Law2_ChCylGeom6D_CohFrictPhys_CohesionMoment(),
					Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),
					Law2_ScGeom6D_InelastCohFrictPhys_CohesionMoment()
				]
			),
			GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.5, label = "ts"),
			fluidCoupling, #to be called after timestepper
			PyRunner(command='sim.printMessage()', iterPeriod= 1, label='outputMessage'),
			newton,
			VTKRecorder(fileName='yadep/3d-vtk-',recorders=['spheres', 'facets', 'intr', 'force'],virtPeriod=0.01)
		]

	def printMessage(self):
		print("********************************YADE-ITER = " + str(O.iter) +" **********************************")
		print("********************************YADE-TIME = " + str(O.time) +" **********************************")

	def printDt(self):
		print(O.dt)

	def setDt(self, dt):
		O.dt = dt

	def irun(self,num):
		O.run(num,1)


if __name__=="__main__":
	sim = simulation()
	sim.irun(1000000)
	fluidCoupling.killMPI()

import builtins
builtins.sim=sim


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