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[Zoheir Khademian <question691922@xxxxxxxxxxxxxxxxxxxxx>]

New question #691922 on Yade:
https://answers.launchpad.net/yade/+question/691922

I am trying to re-assign different temperature values after one cycle of thermal engine by "body.state.temp". However, the conduction scheme stops working and newly assigned body temperature does not change by the boundary conditions. Here is the script:

#*************************************************************************
#  Copyright (C) 2019 by Robert Caulk                                    *
#  rob.caulk@xxxxxxxxx                                                   *
#                                                                        *
#  This program is free software; it is licensed under the terms of the  *
#  GNU General Public License v2 or later. See file LICENSE for details. *
#*************************************************************************/
#
# Script demonstrating the use of ThermalEngine by comparing conduction
# scheme to analytical solution to Fourier (rod cooling with constant 
# boundary conditions). See details in:
#
# Caulk, R., Scholtes, L., Kraczek, M., Chareyre, B. (In Print) A 
# pore-scale Thermo-Hydro-Mechanical coupled model for particulate systems. 
# Computer Methods in Applied Mechanics and Engineering. Accepted July 2020.
#

from yade import pack
from yade import timing
import numpy as np
import shutil
timeStr = time.strftime('%m-%d-%Y')
num_spheres=1000# number of spheres
young=1e6
rad=0.003

mn,mx=Vector3(0,0,0),Vector3(1.0,0.008,0.008) # corners of the initial packing

thermalCond = 2. #W/(mK)
heatCap = 710. #J(kg K) 
t0 = 400. #K

r = rad
k = 2*2.0*r  # 2*k*r 
Cp = 710.
rho = 2600.
D = 2.*r
m = 4./3.*np.pi*r**2/rho
# macro diffusivity
thermalDiff = 6.*k/(D*np.pi*Cp*rho)

identifier = '-conductionVerification'

if not os.path.exists('VTK'+timeStr+identifier):
	os.mkdir('VTK'+timeStr+identifier)
else:
	shutil.rmtree('VTK'+timeStr+identifier)
	os.mkdir('VTK'+timeStr+identifier)

if not os.path.exists('txt'+timeStr+identifier):
	os.mkdir('txt'+timeStr+identifier)
else:
	shutil.rmtree('txt'+timeStr+identifier)
	os.mkdir('txt'+timeStr+identifier)

shutil.copyfile(sys.argv[0],'txt'+timeStr+identifier+'/'+sys.argv[0])

O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=radians(3),density=2600,label='spheres'))
O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls'))
#walls=aabbWalls([mn,mx],thickness=0,material='walls')
#wallIds=O.bodies.append(walls)

O.bodies.append(pack.regularOrtho(pack.inAlignedBox(mn,mx),radius=rad,gap=-1e-8,material='spheres'))

print('num bodies ', len(O.bodies))

ThermalEngine = ThermalEngine(dead=1,label='thermal');

newton=NewtonIntegrator(gravity=(0,0,-10), damping=0.2)
intRadius = 1
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=intRadius),Bo1_Box_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intRadius),Ig2_Box_Sphere_ScGeom()],
		[Ip2_FrictMat_FrictMat_FrictPhys()],
		[Law2_ScGeom_FrictPhys_CundallStrack()],label="iloop"
	),
	FlowEngine(dead=1,label="flow",multithread=False),
	ThermalEngine,	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	#triax,
	VTKRecorder(iterPeriod=500,fileName='VTK'+timeStr+identifier+'/spheres-',recorders=['spheres','thermal','intr'],dead=1,label='VTKrec'),
	newton
]



#goal = -1e5
#triax.goal1=triax.goal2=triax.goal3=goal

#for b in O.bodies:
	#if isinstance(b.shape, Sphere): 
		#b.dynamic=False


# we only need flow engine to detect boundaries, there is no flow computed for this 
flow.dead=0
flow.defTolerance=-1 #0.3
flow.meshUpdateInterval=-1 #200
flow.useSolver=4
flow.permeabilityFactor=-0.7e-7 #1
flow.viscosity=10
flow.bndCondIsPressure=[0,0,0,0,0,0]
flow.bndCondValue=[0,0,0,0,0,0]
flow.boundaryUseMaxMin=[0,0,0,0,0,0]
flow.thermalEngine=True
flow.debug=False
flow.fluidRho = 1000
flow.fluidCp = 4184
flow.fluidK = 0.650
flow.bndCondIsTemperature=[1,1,0,0,0,0]
flow.thermalEngine=True
flow.thermalBndCondValue=[0,0,0,0,0,0]

flow.tZero=t0
flow.pZero=0
thermal.dead=0
thermal.conduction=True
thermal.thermoMech=False
thermal.advection=False
thermal.fluidThermoMech = False
thermal.solidThermoMech = False
thermal.fluidConduction= False

thermal.bndCondIsTemperature=[1,1,0,0,0,0]
thermal.thermalBndCondValue=[0,0,0,0,0,0]
thermal.tsSafetyFactor=0
thermal.particleDensity=2600
thermal.particleT0=t0
thermal.particleCp=heatCap
thermal.particleK=thermalCond
thermal.particleAlpha =11.6e-3
thermal.useKernMethod=False

timing.reset()
#ThermalEngine.dead=0

flow.updateTriangulation=True
O.dt=1.
O.dynDt=False

O.run(1,1)
flow.dead=1

for b in O.bodies:
	if isinstance(b.shape,Sphere) and b.state.pos[1]>.5:
		b.state.temp=700.
	else:
		b.state.temp=100.


#triax.goal2=-11000

def bodyByPos(x,y,z):
	cBody = O.bodies[1]
	cDist = Vector3(100,100,100)
	for b in O.bodies:
		if isinstance(b.shape, Sphere):
			dist = b.state.pos - Vector3(x,y,z)
			if np.linalg.norm(dist) < np.linalg.norm(cDist):
				cDist = dist
				cBody = b
	print('found closest body ', cBody.id, ' at ', cBody.state.pos)
	return cBody

# solution to the heat equation for constant initial condition , BCs=0, and using series for approx
def analyticalHeatSolution(x,t,u0,L,k):
	ns = np.linspace(1,1000,1000)
	solution = 0
	for i,n in enumerate(ns):
		integral = (-2./L)*u0*L*(np.cos(n*np.pi)-1.) / (n*np.pi)
		solution += integral * np.sin(n*np.pi*x/L)*np.exp((-k*(n*np.pi/L)**2)*t)
	return solution
  
# find 10 bodies along x axis
axis = np.linspace(mn[0], mx[0], num=11)
axisBodies = [None] * len(axis)
axisTrue = np.zeros(len(axis))
for i,x in enumerate(axis):
	axisBodies[i] = bodyByPos(x, mx[1]/2, mx[2]/2)
	axisTrue[i] = axisBodies[i].state.pos[0]
np.savetxt('txt'+timeStr+identifier+'/xdata.txt',axisTrue)
print("Axis length used for analy ", max(axisTrue)-min(axisTrue))
from yade import plot

## a function saving variables
def history():
	plot.addData(
		t=O.time,
		i = O.iter,
		temp1 = axisBodies[0].state.temp,
		temp2 = axisBodies[1].state.temp,
		temp3 = axisBodies[2].state.temp,
		temp4 = axisBodies[3].state.temp,
		temp5 = axisBodies[4].state.temp,
		temp6 = axisBodies[5].state.temp,
		temp7 = axisBodies[6].state.temp,
		temp8 = axisBodies[7].state.temp,
		temp9 = axisBodies[8].state.temp,
		temp10 = axisBodies[9].state.temp,
		temp11 = axisBodies[10].state.temp,
)

O.engines=O.engines+[PyRunner(iterPeriod=500,command='history()',label='recorder')]
##make nice animations:
#O.engines=O.engines+[PyRunner(iterPeriod=200,command='flow.saveVtk(withBoundaries=False)')]
VTKrec.dead=0
from yade import plot

plot.plots={'t':(('temp4','k-'),('temp3','r-'))} #
#plot.plots={'t':(('bndFlux1','k-'),('bndFlux2','r-'))} #
plot.plot()
O.saveTmp()
O.timingEnabled=1
from yade import timing
print("starting oedometer simulation")
O.run(20000,1)
timing.stats()










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