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1、湘潭大學(xué)碩士學(xué)位論文移動(dòng)網(wǎng)格方法和層適應(yīng)網(wǎng)格在幾類奇異攝動(dòng)問(wèn)題上的應(yīng)用姓名:周琴申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):計(jì)算數(shù)學(xué)指導(dǎo)教師:陳艷萍湯濤20080501ABSTRACTSingularlyperturbedproblemsarearisingfromfieldssuchasfluidmechanicselasticityacousticsopticschemicalreactionoptimalcontroletc.Theacteristi
2、csofsuchproblemsarethatthedifferentialequationscontainperturbedparameterswhichcanreflectthephysicalacteroftheequationscanbeintroducedartificially.Thesolutionofsuchproblemschangesquicklyinsomelocalregionofthesolvingregion
3、.Movingmeshmethodlayeradaptedgridscansolvetheseproblemseffectively.Inrecentyearsmanyscholarsathomeabroadhaveachievedmanyimptantresultsfsuchproblems.Inthispaperwestudytheapplicationofmovingmeshmethodlayeradaptedgridsfseve
4、ralsingularlyperturbedproblemsbasedonseveralreferences.InthefewdWeintroducethebackgroundofsingularlyperturbedproblemsresearchstatusofmovingmeshmethodlayeradaptedgridsftheseproblemsthenintroducethepaper’swkbriefly.Themain
5、bodyiscomposedofthreeparts.InthefirstpartweconstructdifferenceschemeonmovingmeshofaclassofsingularlyperturbedproblemprovethatthenumericalsolutionofdifferenceschemeismethanfirstderconvergencebyRidsonextrapolation.Weimprov
6、etwoalgithmscomparetheaccuracyrunningtimeofthetwoalgithmsbynumericalexperiments.Intraditionalalgithmstheinitialmeshofmovingmeshesisunifmmesh.WechangeittoBSmeshwhichissuitablefthemodelproblemcomparetherunningtimeaccuracyu
7、nderthetwoconditionsbynumericalexperiments.WegettheresultthatBSmeshisbetterthanunifmmeshasinitialmeshinrunningtimeaccuracy.InthesecondpartweconstructCrankNicolsondifferenceschemeonmovingmeshfaclassofnonconstantsingularly
8、perturbedconvectiondiffusionproblemwithsourcetermintroducetheiterativemethodalgithmofmovingmesh.WecompareerronmovingmeshunifmmeshbynumericalexperimentsprovethatitcandecreasenumericaloscillationeffectivelythatusingCrankNi
9、colsondifferenceschemeonmovingmesh.InthelastpartWeconstructdifferenceschemeofanellipticsingularlyperturbedproblem.Usingdecompositionofsolutionweanalysiseachpartonsubregionsprovethatthenumericalsolutionofdifferenceschemei
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