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1、第15卷 第12期强激光与粒子束Vol.15,No.122003年12月HIGHPOWERLASERANDPARTICLEBEAMSDec.,2003ArticleID:100124322(2003)1221195205NumericalstudyontheRayleigh2TaylorinstabilityXwithvariousinitiallengthscale12WANGLi2li,LIJia2chun(1.InstituteofAppliedPhysicsandComputationalMathem
2、atics,P.O.Box8009212,Beijing100088,China)(2.InstituteofMechanics,theChineseAcademyofSciences,Beijing100080,China)Abstract:TheRayleigh2Taylorinstabilitycausedbyadensitygradientisveryimportantintheinertialconfine2mentfusion.Withthepassivescalartransportmodel,
3、behaviorsoftheinterfacewithvariousinitiallengthscalesaresimulated.Itappearsthattheinitialformhasasignificantinfluenceupontheinterfacialmotion.Longgroovesgrowmoreslowlythansquareshapedperturbations.Andgenerallythemixingprocessintheverticaldirectionmaybede2cr
4、easedbytheinteractionbetweenbubbleswithdifferentscales.Keywords:Rayleigh2Taylorinstability;Passivescalartransportmodal;Inertialconfinementfusion(ICF);Multi2scale;InterfaceCLCnumber:TN241;O354Documentcode:AIntheinertialconfinementfusion(ICF),whenthedeuterium
5、2tritiumcapsuleisirradiatedwithanintenselaser,theshellofthecapsuleissphericallyacceleratedinwardstocompresstheDTfuel.Thelightfluidformedbyablationoftheshellpushestheheavyfluid(therestoftheshell)acrossasurface,whichwillcausetheRayleigh2Taylorinstability.Evol
6、utionoftheRayleigh2TaylorinstabilitydisruptsthesphericalsymmetryandmaycausethefailureoftheignitionofDT.Therefore,itisveryimportanttounderstandthisinstabilityforimprovingthedesignoftheshells.Asakeyprobleminbothfundamentalresearchandtechnologicalapplications,
7、theRayleigh2Taylorinstabilityhasattractedgreatattentioninthepasttwodecades.Severalnumericalmethodshavebeenperformed,[1,2][3][4]suchasthelevelsetmethod,thefronttrackingscheme,thelatticeBoltzmannschemeandsoon.Thephysicalinterestofthispaperisfocusedontheeffect
8、ofthelengthscaleintheinitialperturbationontheevolutionoftheinstability.Evolutionfromtwokindsofinitialperturbationformsisachieved.Oneisasinglesinu2soidalbubblewithdifferentlengthscalesinxandydirections.
