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[Mithushan Soundaranathan <question699437@xxxxxxxxxxxxxxxxxxxxx>]

Question #699437 on Yade changed:
https://answers.launchpad.net/yade/+question/699437

Description changed to:
Hi,
 
I want save my code in middle of simulation,  save in stopUnloading() have completed. Then load the saved simulation and continue with some other simulation (e.i increasing particle radius over time) on saved packing. 

I tried with o.load('Tablet_swelling') in end of my code, after using
o.save('Tablet_swelling'). Btw I am using the same code for everything
and also deleted the o.save line in my code when I used o.load.  I am
getting error message saying plate is not defined and some other
parameter. If try define plate, the plate increase in size.

I was wondering, what it the best way to save the simulation in the
middle and then load it and continue with simulation.

Here is my code:
from __future__ import print_function
from yade import utils, plot, timing
from yade import pack
import pandas as pd
import numpy as np
from PIL import Image
from yade import pack, export
from scipy.interpolate import interp1d
readParamsFromTable(k1=2e5,kp=2e6)
from yade.params.table import *
from scipy.integrate import odeint
import matplotlib.pyplot as plt
import os
import csv
from matplotlib.pyplot import figure
from scipy.interpolate import interp1d
from pylab import *
from scipy.optimize import curve_fit

o = Omega()
# Physical parameters
fr = 0.41
rho = 1561
Diameter = 0.0012/2
D=Diameter
r1 = Diameter/2
#r2 = Diameter/2
k1 = 1.26e5
kp = 12*k1
kc = k1 * 0.1
ks = k1 * 0.1
DeltaPMax = Diameter/3.0
Chi1 = 0.34
PhiF1=0.999
#PhiF1 = DeltaPMax*(kp-k1)*(r1+r2)/(kp*2*r1*r2)

o.dt = 1.0e-7
particleMass = 4.0/3.0*math.pi*r1*r1*r1*rho
Vi1 = math.sqrt(k1/particleMass)*DeltaPMax*Chi1
m_tot=0.0005
#no_p=m_tot/particleMass
no_p=1000


Tab_rad=0.005
Cyl_height=0.015
cross_area=math.pi*(Tab_rad**2)

Comp_press= 1.2e8
Comp_force=Comp_press*cross_area

##Single particle swelling model
def model(r,t,Q_max,rho_t,rho_w,r_0,D):
    Q=((rho_w*(r**3))/(rho_t*(r_0**3)))-(rho_w/rho_t)+1;
    drdt =((D*rho_t)/(r*rho_w))*((Q_max-Q)/Q); 
    return drdt
P=[1.45,rho,1000,396.39e-12]

#*************************************
# Add material
mat1 = o.materials.append(LudingMat(frictionAngle=fr, density=rho, k1=k1, kp=kp, ks=ks, kc=kc, PhiF=PhiF1, G0 = 0.0))


# Spheres for compression and walls
sp=pack.SpherePack()
sp.makeCloud((-5.0*Diameter,-5.0*Diameter,-12*Diameter),(5.0*Diameter,5.0*Diameter,7.0*Diameter), rMean=Diameter/2.0,rRelFuzz=0.18,num=1000)
sp.toSimulation(material=mat1)
walls=o.bodies.append(yade.geom.facetCylinder((0,0,0),radius=Tab_rad,height=Cyl_height,segmentsNumber=20,wallMask=6,material=mat1))

r_save=[]
radius=[]
initial_save=[]
size_save=[]
radius.append(0)
swell_t=np.zeros((1,no_p))
i=0
for b in O.bodies:
    if isinstance(b.shape, Sphere):
        radius.append(b.shape.radius)
r_save.append(radius)

# Add engines 
o.engines = [
  ForceResetter(),
  InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=1.05),
                         Bo1_Wall_Aabb(),
                         Bo1_Facet_Aabb()
                         ]),
  InteractionLoop(
    [Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=1.05),
     Ig2_Facet_Sphere_ScGeom(),
     Ig2_Wall_Sphere_ScGeom()],
    [Ip2_LudingMat_LudingMat_LudingPhys()],
    [Law2_ScGeom_LudingPhys_Basic()]
  ),
  NewtonIntegrator(damping=0.1, gravity=[0, 0, -9.81]),
  PyRunner(command='checkForce()', realPeriod=1, label="fCheck"),
  #DeformControl(label="DefControl")
]


def checkForce():
    # at the very start, unbalanced force can be low as there is only few
    # contacts, but it does not mean the packing is stable
    if O.iter < 400000:
        return
    # the rest will be run only if unbalanced is < .1 (stabilized packing)
    timing.reset()
    if unbalancedForce() > 1:
        return
    # add plate at upper box side

    highSphere = 0.0
    for b in O.bodies:
        if highSphere < b.state.pos[2] and isinstance(b.shape, Sphere):
            highSphere = b.state.pos[2]
        else:
            pass

    o.bodies.append(wall(highSphere, axis=2, sense=-1, material=mat1))
    global plate
    plate = o.bodies[-1]  # the last particles is the plat
    plate.state.vel = (0, 0, -2)
    fCheck.command = 'unloadPlate()'


def unloadPlate():
    # if the force on plate exceeds maximum load, start unloading
    # if abs(O.forces.f(plate.id)[2]) > 5e-2:
    if abs(o.forces.f(plate.id)[2]) > Comp_force:
        plate.state.vel *= -1
        # next time, do not call this function anymore, but the next one
        # (stopUnloading) instead
        fCheck.command = 'stopUnloading()'


def stopUnloading():
    if plate.state.pos[2] > Cyl_height/2:
        plate.state.vel = (0, 0, 0)
        initial_save.append(utils.aabbExtrema()[1][2]+r1)
        initial_save.append(O.iter)
        o.engines = o.engines+[PyRunner(command='ParticleSwelling()', iterPeriod=100000)]
        o.save('Tablet_swelling')
        

def ParticleSwelling():
    time_current=(O.iter-initial_save[1])*o.dt
    Liq_pos=0.24*(time_current**0.574)
    Liq_pos=Liq_pos*1e-3 #convert to m
    radius=[]
    radius.append(time_current) 
    for b in O.bodies:
        if isinstance(b.shape, Sphere):
            par_pos=(initial_save[0]-b.state.pos[2])
            k=b.id
            r_now=b.shape.radius
            if Liq_pos>=par_pos:
                r_0=r_save[0][k+1]
                if swell_t[0][k]==0:
                    swell_t[0][k]=time_current
                    radius.append(r_save[0][k+1])
                    continue
                time=time_current-swell_t[0][k]
                t = np.linspace(0,time)
                r = odeint(model,r_0,t,args=(P[0],P[1],P[2],r_0,P[3],))
                r_new=float(r[-1])
                radius.append(r_new)
                b.shape.radius = float(r[-1])
                f=float(r[-1])/r_new
                mcurrent=b.state.mass
                mnew=mcurrent*(f*f*f)
                b.state.mass=mnew
                Icurrent=b.state.inertia
                Inew=Icurrent*(f*f*f*f*f)
                b.state.inertia=Inew
            elif Liq_pos<par_pos:
                radius.append(r_save[0][k+1])
    r_save.append(radius) 
    size_current=[time_current,utils.aabbDim()[2]]
    size_save.append(size_current)
    
o.load('Tablet_swelling')

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