ABAQUS分析收敛控制.docx
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ABAQUS分析收敛控制.docx
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ABAQUS分析收敛控制
AbaqusAnalysisUser'sManual©
7.2.1Convergeneeandtimeintegrationcriteria:
overview
NumerouscontrolparametersareassociatedwiththeconvergeneeandintegrationaccuracyalgorithmsinAbaqus/Standard.Theseparametersare
assigneddefaultvaluesthatarechosentooptimizetheaccuracyandefficiencyofthesolutionforawidespectrumofnonlinearproblems.Youcanchangethesolutioncontrolparameters,asdescribedinthefollowingsections:
«Abriefsynopsisofthemoreimportantsolutioncontrolparameters,togetherwithadescriptionofthecircumstancesinwhichtheycanbeusedeffectively,isprovidedinCommonlyusedcontrol
parameters,”Section7.2.2.Thissectionislikelytobethemost
usefulforthegeneraluserandshouldbereadfirst.
«Abaqus/Standardincorporatesanempiricalalgorithmdesignedto
solvetheequilibriumequationsofnonlinearsystemsaccuratelyand
economically.Thecriteriausedtoestablishconvergeneeof
nonlinearincrementsandtheautomaticadjustmentofincrementsizebasedontheconvergeneeratearedescribedinConvergeneecriteriafornonlinearproblems,”Section7.2.3.
*Abaqus/Standardallowsyoutochoose“timeintegrationaccuracy
parameters”inproblemsthathaveaphysicaltimescale.Thealgorithmsthatusetheseparametersforautomaticallyeontrolling
timeincrementsizesaredescribedinTimeintegrationaccuracyin
transientproblems,”Section7.2.4.
•Abaqus/CFDallowsyoutochoosetheeontrolparametersusedinanAbaqus/CFDtoAbaqus/StandardortoAbaqus/Explicitco-simulationtoalleviateinstabilityandmeshdistortionduringtheanalysis.
Modifyingthedefaultsolutioncontrols
Thedefaultvaluesforthesolutioneontrolparametersneednotbeadjustedformostcases.Youcanresetthem,however,withinastepdefinition.
Valuesgivenforthesolutioncontrolparametersremainineffectfortheremainderoftheanalysisoruntiltheyarereset.
InputFileUsage:
*CONTROLS
The*CONTROL5ptioncanberepeated,ifnecessary,withdifferentparameters.
Abaqus/CAEUsage:
Stepmodule:
Other—GeneralSolutionControlsEdit:
toggleonSpecify
Resettingalldefaultsolutioncontrols
Youcanrestoreallsolutioncontrolparameterstotheirdefaultvalues.
InputFileUsage:
*CONTROLRESET
Abaqus/CAEUsage:
Stepmodule:
Other—GeneralSolutionControlsEdit:
toggleonResetallparameterstotheirsystem-defineddefaults
7.2.2Commonlyusedcontrolparameters
Products:
Abaqus/StandardAbaqus/CFDAbaqus/CAE
References
Convergeneeandtimeintegrationcriteria:
overview,”Section
7.2.1
•
Section14.15.1ofthe
CONTROLS
•Customizinggeneralsolutioncontrols,Abaqus/CAEUser'sManual
Overview
Solutioncontrolparameterscanbeusedtocontrol:
«nonlinearequationsolutionaccuracy;
«timeincrementadjustment;and
«FSIstabilizationandmeshdistortioninanAbaqus/CFDtoAbaqus/StandardortoAbaqus/Explicitco-simulation.
Thesesolutioncontrolparametersneednotbechangedformostanalyses.Indifficultcases,however,thesolutionproceduremaynotconvergewiththedefaultcontrolsormayuseanexcessivenumberofincrementsanditerations.Afterithasbeenestablishedthatsuchproblemsarenotduetomodelingerrors,itmaybeusefultochangecertaincontrolparameters.
Thissectionpresentsabriefsynopsisofthemoreimportantsolutioncontrolparameters,togetherwithadescriptionofthecircumstancesinwhichtheycanbeusedeffectively.
Valuesgivenforthesolutioncontrolparametersremainineffectforthe
remainderoftheanalysisoruntiltheyarereset.Youcanrestoreall
solutioncontrolparameterstotheirdefaultvalues(seeConvergeneeandtimeintegrationcriteria:
overview,”Section7.2.1).
Terminology
Inthissectiontheword“flux”meansthevariablewhosediscretized
equilibriumisbeingsoughtandforwhichtheequilibriumequationsmaybenonlinear:
force,moment,heatflux,concentrationvolumetricflux,or
poreliquidvolumetricflux.Theword“field”referstothebasic
variablesofthesystem,suchasthecomponentsofthedisplacementinacontinuumstressanalysisortemperatureinaheattransferanalysis.Thesuperscript■referstoonesuchtypeofequation.ThefieldsandcorrespondingfluxesavailableinAbaqus/Standardarelistedin
Convergeneecriteriafornonlinearproblems,”Section7.2.3.
Definingtolerancesforfieldequations
Solutioncontrolparameterscanbeusedtodefinetolerancesforfieldequations.Youcanselectthetypeofequationforwhichthesolutioncontrolparametersarebeingdefined,asshowninTable7.2.2-1.The
defaulttolerancescanberesetiftheanalysisdoesnotrequirehighaccuracyintheconvergeneecriteria.
Table7.2.2—1Sel
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