简介:Thispaperconsidersakindofstronglycoupledcrossdiffusionparabolicsystem,whichcanbeusedasthemulti-dimensionalLyumkisenergytransportmodelinsemiconductorscience.Theglobalexistenceandlargetimebehaviorareobtainedforsmoothsolutiontotheinitialboundaryvalueproblem.Whentheinitialdataareasmallperturbationofanisothermalstationarysolution,thesmoothsolutionoftheproblemundertheinsulatingboundarycondition,convergestothatstationarysolutionexponentiallyfastastimegoestoinfinity.
简介:1.IntroductionWeareconcernedwiththesemigroupapproachtotheinitialvalueproblemfordoublynonlineardegenerateparabolicequationoftheformwhicharisesfromdifferentphysicalbackgroundssuchasthemodelingofthemotionofnon-Newtonianfluids.Inthepastyears,thenonlinear...
简介:Atrecent,Hourgatetgaveadomaindecompositionalgorithmforellipticproblemswhichcanbeimplementedinparallel.Manynumericalexperimentshaveillustrateditsefficiency.Inthepresentpaper,weapplythisalgorithmtosolvethediscreteparabolicproblems,analyseitsconvergenceandshowthatitsconvergenceraleisabout(1-2p+σp2)whichisnearlyoptimalandindependentoftheparameterτ,whereστO((1+H)(1+ln(H/h))2).0
简介:在这份报纸,我们学习交往的散开的线性系统的一个班的一些各态历经的定理,它是一个寓言的安德森模型。首先,在假设下面转变内核=(一(我,j))我,jS是二倍地随机的,我们获得长期的集中到基于自我两重性从围住的一泛音函数h开始的不变的概率措施h性质,然后我们显示出集中到措施h为起始的分布的一个宽广的类保持的不变的概率。秒(一(我,j))我,jS短暂、对称,并且在阀值下面的散开参数c遗体,我们能决定不变的概率与有限的秒测量的extremal的集合时刻。最后,在情况中转变核(一(我,j))我,jS是二倍地随机的并且满足大小写我(看见大小写我在里面[Shiga,T.:在人口遗传的一个交往的系统。J。数学。京都大学,20,213242(1980)]),我们证明这个寓言的安德森模型局部地灭绝独立于散开参数c。
简介:Inthispaper,weprovetheexistenceofsolutionoftheCauchyproblemofanonlineardegenerateparabolicequation.Moreoversomeregularizingeffectsareexhibited.
简介:Errorestimatesareestablishedforthefinitedementmethodstosolveaclassofsecondordernonlinearparabolicequations.OptimalratesofconvergenceinL2-andH1-normsarederived.Meanwhile,theschenesaresecondordercorrectintime.
简介:InthispaperweintroducetwokindsofparallelSchwarzdomaindecompositionmethodsforgeneral,selfadjoint,secondorderparabolicequationsandstudythedependenceoftheirconvergenceratesonparametersoftime-stepandspace-mesh.Weprovethatthe,approximatesolutionhasconvergenceindependentofiterationtimesateachtime-level.AndtheL~2errorestimatesaregiven.
简介:这篇论文讨论加速为解决非线性的抛物线的方程的含蓄的计划的反复的方法。二个新非线性的反复的方法由theimplicit明确的伪说出--牛顿(IEQN)方法和衍生物免费的含蓄明确的伪--牛顿(DFIEQN)方法被介绍,在哪个结果从linearization的线性方程能保存原来的部分微分方程的抛物线的特征。重复方法的反复的顺序能集成二次的联盟者到含蓄的计划的答案,这被证明。而且与Jacobian免费Newton-Krylov(JFNK)方法相比,theDFIEQN方法有一些优点,例如,它的实现是容易的,并且它与一个明确的系数矩阵给一个线性代数学的系统,以便线性(内部)重复没被限制为Krylov方法。由IEQN,DFIEQN,JFNK和Picard重复方法的计算结果在理论的证实和这些方法的表演的比较被介绍。
简介:Infiniteelementanalysisoftransienttemperaturefield,itisquitenotoriousthatthenumericalsolutionmayquitelikelyoscillateand/orexceedtheredsonablescope,whichviolatesthenaturallawofheatconductionForthisreason,weputforwardtheconceptoftimemonotonyandspatialmonotonyandthenderiveseveralsufficientconditionsformonolonicsolutionsintimedimensionfor3-Dpassiveheatconductionequationswithagroupoffinitedifferenceschemes.Forsomespecialboundaryconditionsandregularelementmeshes,thelowerandupperboundsfor△t/△x~2canbeobtainedfromthoseconditionssothatreasonablenumericalsolutionsareguaranteed.Spatialmonotonyisalsodiscussed.Finally,thelumpedmassmethodisanalyzed.Wecreativelygiveseveralnewcriteriaforthefiniteelementsolutionsofaclassofparabolicequationrepresentedbyheatconductionequation.