Particle Replacement Tutorial.docx

Particle Replacement Tutorial.docx

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ParticleReplacementTutorial

EDEMTutorial:

BondedParticles

NotethistutorialusestheEDEMv1.1legacyAPI

Introduction

ThistutorialdescribeshowtocreateasimulationthatusesEDEM’sbondedparticlemodel.Themodelalsousescustomfactoriesandaparticlebodyforce.

（1）

（2）

（3）

（4）

（1）Solidspheresarecreatedandallowedtosettle.

（2）Thelargeparticlesarereplacedwithbondedmeta-particles.（3）Thebondedmeta-particlesaredamagedinthemill,and（4）eventuallybreakup.

1.StartEDEMthengotoFile>SaveAs…

2.Selectaworkingdirectoryonthelocalmachine（e.g.“C:

\EDEM_Tutorials”）.

3.Enterafilename（e.g.“Bonded_Tutorial.dem”）andclickSave.

4.Copythefollowingtutorialfilestoyourworkingdirectory:

ParticleReplacement.dll

Particle_Replacement_prefs.txt

Particle_Cluster_Data.txt

EDEMCreator:

Settingupthemodel

Step1:

SettheGlobalModelParameters

Choosetheunits

ThefirststepincreatingthemodelistosettheunitsusedthroughoutEDEM.

1.GototheOptions>Unitsmenu.

2.Changethefollowingmeasurementunits:

▪Angularvelocitytorpm

▪Lengthtomm

Enterthemodeltitleanddescription

ThemodeltitleanddescriptionwillappearintheDataBrowserwindow.

1.ClickontheGlobalstabintheTabspane.

2.EnterthetitleGrindingmillsimulationinvolvingthebondedparticlemodelintheTitlefieldintheSimulationsection.

Editthefilelocations

SettheEDEMfilelocationstoreadthecustomlibrariesyoucopiedtoyourworkingdirectory:

1.BrowsetoOptions>FileLocations.

2.SetthedirectoryforParticleBodyForceandFactoriestoyourworkingdirectory.

Setthegravityanddefinethematerials

1.Besuregravityissetto-9.81m/s2intheZdirection.

2.IntheMaterialssection,clicktheTransferbuttontoopentheMaterial/InteractionsTransferdialog.

3.TransferHigh-stiffnessfromthematerialsdatabasetoyoursimulation.

4.ClickOKthenrenamethematerialassteel.

5.Clickthe+buttonatthetopoftheMaterialssection.Thiscreatesanewmaterial.

6.Highlightthematerialandchangeitsnametoparticle.

7.SetthePoisson'sratio,Shearmodulus,anddensityasshownbelow:

Definetheinteractionsbetweenthematerials

1.Selectparticlefromthedrop-downlistatthetopofthematerialssection.

2.Clickthe+buttonintheInteractionsection.Selectparticlewhenprompted.

3.Setthecoefficientsasfollows:

4.Addaninteractionforsteelwithcoefficientsasfollows:

Step2:

DefinetheParticles

Createfirstparticletype

1.ClickontheParticletabintheTabspane.

2.Clickthe+buttonandtypeaname10mm_spheresintheNamefield.

3.Settheradiusofthesurfaceto10mm.

1.Setthematerialtoparticle.

2.ClicktheCalculatePropertiesbuttonandpicktheSurfacesoption.

Createsecondparticletype

1.Clickthenewparticle+buttonagainandtypeanameFraction.

2.Settheradiusofthesurfaceto3mm.

3.Setthecontactradiusto4mm.

3.Setthematerialtoparticle.

4.ClicktheCalculatePropertiesbuttonandpicktheSurfacesoption.

Createthirdparticletype

1.Clickthenewparticle+buttonagainandtypeanameWhole.

2.Settheradiusofthesurfaceto20mm.

5.Setthematerialtoparticle.

6.ClicktheCalculatePropertiesbuttonandpicktheSurfacesoption.

Step3:

Setthephysicsmodels

1.SelectParticletoParticlefromtheInteractionpulldowninthePhysicssection.

2.SelectHertz-Mindlin（noslip）thenclickthexbuttontoremoveit.

3.Clickthe+buttonthenselecttheHertz-MindlinwithBondingbuilt-inmodel:

4.Clicktheconfigurebutton

todefinethebond.

5.AddaFraction+Fractionactivebondthensettheparametersasfollows:

6.SelectParticletoGeometryfromtheInteractionpulldown.

7.SelectHertz-Mindlin（noslip）thenclickthexbuttontoremoveit.

8.Clickthe+buttonthenselecttheHertz-MindlinwithBondingbuilt-inmodel.

ParticlesdonotbecomebondedtothegeometrywhenusingtheHertz-MindlinwithBondingmodel:

addingaparticle-geometryinteractionensuresthedifferencebetweenphysicalandcontactradiusistakenintoaccount.

9.SelectParticleBodyForcefromtheinteractionpulldownthenchooseParticleReplacement:

Step4:

DefinetheDomainandGeometry

Importthemillgeometry

ThemillgeometryhasbeencreatedinaCADpackagereadyforimport.

1.ClickontheGeometrytabintheTabspane.

2.ClicktheImportbuttonintheSectionssection.

3.Navigatetothefilegrinding_mill.stpandimportit.

4.WhentheGeometryImportParametersdialogappearsleaveallthesettingsatthedefaultvaluesandclickOK.

5.Whenprompted,settheunitsofmeasurementtoMilimetres（mm）.

6.Renamethegeometrytomillandsetthematerialtosteel.

Configurethedynamics

1.SelectthemillthenclicktheDynamicstab.

2.Createanewlinearrotationdynamicasfollows:

Createtheparticlefactorygeometry

1.ClicktheGeometrytab.

2.Clickthe+buttontocreateanewcylindercalledfactory.

3.Clickonthepolygontabandsetthespecificationasfollows:

4.ClickontheDetailstabandsetthetypetovirtual.

Createtheoutercylinder

1.ClicktheGeometrytab.

2.Clickthe+buttontocreateanewcylindercalledouter_walls.

3.Clickonthecylindertabandsetthespecificationasfollows:

4.ClickontheDetailstabandsetthetypetophysicalandmaterialtosteel.

Step5:

CreatetheParticleFactories

Createtwoparticlefactories–oneforeachtypeofparticle.

Createthefirstparticlefactory

1.ClickontheFactoriestab.

2.Clickthe+buttontocreateNewFactory1.

3.Setfactorytypetostatic.

4.SelectCreate3particles.

Setthefactory’sinitialconditions

1.BesureNewFactory1isselectedintheSectionpulldown.

2.SettheTypetofixedandselectWhole.

3.SettheZvelocityto-1.0m/s.

Createthesecondparticlefactory

1.Clickthe+buttonagaintocreateNewFactory2.

2.Setfactorytypetostatic.

3.SelectCreate100particles.

Setthefactory’sinitialconditions

1.BesureNewFactory2isselectedintheSectionpulldown.

2.SettheTypetofixedandselect10mm_spheres.

3.SettheZvelocityto-1.0m/s.

Addthecustomfactory

SelectTransfer…andchooseParticleReplacement.（orParticleReplacementx64）

Thecustomfactoryhasalreadybeenwrittenandcompiled.TheParticleBodyForcepartofthefactoryremovesallparticlescalledWholeatasetpointintimeandreplacesthemwithameta-particlemadefromanumberparticlesoftypeFraction.

Singlesphereparticlereplacedwithamultispheremeta-particle

SettingsforthefactoryaredefinedinthefileParticle_Replacement_prefs.txt.

Thepositionsoftheindividualsphereswithinthemeta-particlearecontrolledbythefileParticle_Cluster_Data.txt.

EDEMSimulator:

RuntheSimulation

Step1:

SettheTimeOptions

Setthetimestep

1.ClickontheSimulatorbutton:

2.Setthefixedtimestepto20%.（~2.0e-05）

Setthesimulationtimeandgridoptions

Thesimulationtimeistheamountofrealtimeyoursimulationrepresents.

1.Setthetotalsimulationtimeto5s.

2.SettheTargetSaveIntervalto0.005s.

3.Setthegridsizeto6Rmin.

Step2:

RuntheSimulation

1.ClicktheStartprogressbuttonatthebottomofthesimulationwindow.

2.ClicktheRefreshViewerbuttonatanypointtoupdatetheViewerandseehowthesimulationisprogressing.

EDEMAnalyst:

AnalyzingYourResults

Step1:

ConfiguringtheDisplay

Configurethegeometry

1.SwitchtotheAnalystandclicktheModeltab.

2.ReducetheopacityoftheMillto0.8thenclickApply.

3.SelectFactory,de-selectdisplay,thenclickApply.

4.Selectouter_walls,de-selectdisplay,thenclickApply.

Step2:

ColoringElements

1.ClicktheColoringtab.

2.SelectauniquecolorfortheparticletypesWhole,Fractionand10mm_sphere.

3.ClickthePlaybuttontowatchtheparticlebreak-upinprogress.

Step3:

GraphingBonds

1.SwitchtothegraphingtoolthenclicktheLineGraphtab.

2.LeavetheXaxisastimeandsettheremainingoptionsasfollows:

3.ClickCreateGraphtocreatethegraph: