欢迎来到天天文库
浏览记录
ID:39076330
大小:352.82 KB
页数:20页
时间:2019-06-24
《A time-splitting technique for the一种时间分割技术 地下水平流弥散方程》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Atime-splittingtechniquerfotheadvection-dispersionequationinatergroundw1AnnamariaMazzia,LucahiBergamascandMarioPuttiDept.alMathematicdsMethoanddelsMoforScienticationsApplicUniversityofPadua,viaBelzoni7,Padova,ItalyE-mail:fmazzia,berga,puttig@dmsa.unipd.itInthispape
2、ratime-splittinghniquetecfortheowtdimensionalection-advdispersionequationisproposed.AhighresolutioninspaceGovdunomethodforectionadvisbinedcomwiththeT0RMixedFinitetElemenforthediscretizationofthedispersionterm.Numericaltestsonananalyt-icalonedimensionalexampleascerta
3、intheergencevconpropertiesoftheheme.sctAtdierenecletPbumers,nthehoicecofoptimaltimestepsizeusedfortheowtequationsisdiscussed,wingshothatwithaccurateselectionofthetimestepsizes,theerallvoCPUtimerequiredybtheulationssimcanbedrasticallyreduced.Resultsonarealistictestc
4、aseofatergroundwcon-ttaminantransportconrmthattheproposedhemescdoesnotsuerfromecletPlimitations,andysaalwysdisplaonlysmalltsamounofumericalndiusionacrossthetireenrangeofecletPbumers.n1.ODUCTIONINTRInthispaperewtrateconcenontheection-dispadversionequation,h,whicfo
5、rex-ample,canbeusedtodescribesolutetransportinowtdimensionalporousmedia.Thisequationisdiculttoximateapprowhenectionadvdominatesbecausesharptrationconcentsfrontendtoelopdevandevmowithouthangingcform.Itisellwwnknothatstandardnitedierenceandnitetelemenmethodsymanot
6、orkwellwforproblemswithsharpts,fronwingshoysicalnon-phoscillations.oTercomevothisphenomena,umericalnhemessctrytobinecomumericalnystabilitwithminimalarticialdiusion.oTwhesapproacaregenerallyusedinthesesituations.Oneisbasedonthedenitionofapropertrolconolumevwherewi
7、nduphniquesteccanbeusedforximatingapprotheeectivadv ux.Inthiscasetheystabilitofthehemescisobtainedybaddingantamounofumericalndiusionthatisdeptendenonthehapproacused].[15Theotherclassofmethodsoriginatesfromthesplittingof1ThisorkwaswpartiallysupportedybtheECInco-Cope
8、rnicusprogramtract(conn.ERBIC15CT96-0211)andMURSTprojectAnalisiNumerica:MetodiearewSoftMatematico"oTbepublishedinJournalofComputationaly
此文档下载收益归作者所有