------------------------------------------------------------ revno: 4029 committer: bchareyre <[email protected]> timestamp: Thu 2017-03-30 18:42:26 +0200 message: add exemple script for two-phase flow with 2PFV technique, related to Yuan and Chareyre (2017) added: examples/FluidCouplingPFV/drainage-2PFV-Yuan_and_Chareyre_2017.py
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=== added file 'examples/FluidCouplingPFV/drainage-2PFV-Yuan_and_Chareyre_2017.py' --- examples/FluidCouplingPFV/drainage-2PFV-Yuan_and_Chareyre_2017.py 1970-01-01 00:00:00 +0000 +++ examples/FluidCouplingPFV/drainage-2PFV-Yuan_and_Chareyre_2017.py 2017-03-30 16:42:26 +0000 @@ -0,0 +1,148 @@ +# encoding: utf-8 +# This script demonstrates a simple case of drainage simulation using the "2PFV" two-phase model implemented in UnsaturatedEngine. +# The script was used to generate the result and supplementary material (video) of [1]. The only difference is the problem size (40k particles in the paper vs. 1k (default) in this version) +# [1] Yuan, C., & Chareyre, B. (2017). A pore-scale method for hydromechanical coupling in deformable granular media. Computer Methods in Applied Mechanics and Engineering, 318, 1066-1079. (http://www.sciencedirect.com/science/article/pii/S0045782516307216) + +import matplotlib; matplotlib.rc('axes',grid=True) +from yade import pack +import pylab +from numpy import * + +utils.readParamsFromTable(seed=1,num_spheres=1000,compFricDegree = 15.0) +from yade.params import table + +seed=table.seed +num_spheres=table.num_spheres# number of spheres +compFricDegree = table.compFricDegree # initial contact friction during the confining phase (will be decreased during the REFD compaction process) +confiningS=-1e5 + +## creat a packing with a specific particle side distribution (PSD) +psdSizes,psdCumm=[.599,0.6,0.849,0.85,1.0,1.40],[0.,0.35,0.35,0.70,.70,1.] +sp=pack.SpherePack() +mn,mx=Vector3(0,0,0),Vector3(10,10,10) +sp.makeCloud(minCorner=mn,maxCorner=mx,psdSizes=psdSizes,psdCumm=psdCumm,distributeMass=True,num=num_spheres,seed=seed) + +## create material #0, which will be used as default +O.materials.append(FrictMat(young=15e7,poisson=.4,frictionAngle=radians(compFricDegree),density=2600,label='spheres')) +O.materials.append(FrictMat(young=15e7,poisson=.4,frictionAngle=0,density=0,label='frictionless')) + +## create walls around the packing +walls=aabbWalls((mn,mx),thickness=0,material='frictionless') +wallIds=O.bodies.append(walls) + +O.bodies.append([utils.sphere(center,rad,material='spheres') for center,rad in sp]) + +triax=TriaxialStressController( + internalCompaction=True, + goal1=confiningS, + goal2=confiningS, + goal3=confiningS, + max_vel=10, + label="triax" +) + +newton=NewtonIntegrator(damping=0.4) + +O.engines=[ + ForceResetter(), + InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]), + InteractionLoop( + [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()], + [Ip2_FrictMat_FrictMat_FrictPhys()], + [Law2_ScGeom_FrictPhys_CundallStrack()] + ), + GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8), + triax, + newton +] + +while 1: + O.run(1000,True) + unb=unbalancedForce() + if unb<0.01 and abs(triax.goal1-triax.meanStress)/abs(triax.goal1)<0.001: + break + +############################# +## REACH NEW EQU. STATE ### +############################# +finalFricDegree = 30 # contact friction during the deviatoric loading + +#We move to deviatoric loading, let us turn internal compaction off to keep particles sizes constant +triax.internalCompaction=False +# Change contact friction (remember that decreasing it would generate instantaneous instabilities) +setContactFriction(radians(finalFricDegree)) + +while 1: + O.run(1000,True) + unb=unbalancedForce() + if unb<0.001 and abs(triax.goal1-triax.meanStress)/abs(triax.goal1)<0.001: + break + +triax.depth0=triax.depth +triax.height0=triax.height +triax.width0=triax.width +O.save('1kPacking.yade') #save the packing, which can be reloaded later. + +O.run(1000,True) +ei0=-triax.strain[0];ei1=-triax.strain[1];ei2=-triax.strain[2] +si0=-triax.stress(0)[0];si1=-triax.stress(2)[1];si2=-triax.stress(4)[2] + +from yade import plot +O.engines=O.engines+[PyRunner(iterPeriod=20,command='history()',dead=1,label='recorder')] + +def history(): + plot.addData(e11=-triax.strain[0]-ei0, e22=-triax.strain[1]-ei1, e33=-triax.strain[2]-ei2, + s11=-triax.stress(0)[0]-si0, + s22=-triax.stress(2)[1]-si1, + s33=-triax.stress(4)[2]-si2, + pc=-unsat.bndCondValue[2], + sw=unsat.getSaturation(False), + i=O.iter + ) + +plot.plots={'pc':('sw',None,'e22')} +plot.plot() + +####################################################### +## Drainage Test under oedometer conditions ### +####################################################### +##oedometer conditions +triax.stressMask=2 +triax.goal1=triax.goal3=0 +goalTop=triax.stress(3)[1] +triax.goal2=goalTop +triax.wall_bottom_activated=0 +recorder.dead=0 + +##Instantiate a two-phase engine +unsat=UnsaturatedEngine() +meanDiameter=(O.bodies[-1].shape.radius + O.bodies[6].shape.radius) / 2. + +##set boundary conditions, the drainage is controlled by decreasing W-phase pressure and keeping NW-phase pressure constant +unsat.bndCondIsPressure=[0,0,1,1,0,0] +unsat.bndCondValue=[0,0,-1e8,0,0,0] +unsat.isPhaseTrapped=True #the W-phase can be disconnected from its reservoir +unsat.initialization() +unsat.surfaceTension = 10 + +##start invasion, the data of normalized pc-sw-strain will be written into pcSwStrain.txt +file=open('pcSwStrain.txt',"w") +for pg in arange(1.0e-5,15.0,0.1): + #increase gaz pressure at the top boundary + unsat.bndCondValue=[0,0,(-1.0)*pg*unsat.surfaceTension/meanDiameter,0,0,0] + #compute the evolution of interfaces + unsat.invasion() + #save the phases distribution in vtk format, to be displayed by paraview + unsat.savePhaseVtk("./") + #compute and apply the capillary forces on each particle + unsat.computeCapillaryForce() + for b in O.bodies: + O.forces.setPermF(b.id, unsat.fluidForce(b.id)) + #reac + while 1: + O.run(1000,True) + unb=unbalancedForce() + if unb<0.01: + break + file.write(str(pg)+" "+str(unsat.getSaturation(False))+" "+str(triax.strain[1]-ei1)+"\n") +file.close()
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