sph在水下高速物体空泡发展模拟中的应用

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1、第31卷第1期计算物理Vo1．31．No．12014年1月CHINESEJOURNALOFCOMPUTATIONALPHYSICSJan．，2014文章编号：1001—246X(2014)O1-0027-06SPHforDevelopingSupercavityInducedbyHighSpeedUnderwaterBodyZHENGJun，YUKaiping，WANGJunfeng．LIChangfeng(1．SchoolofEnergyandPowerEngineering，JiangsuUniversity，Z

2、henjiang212013，China；2·SchoolofAstronautics，HarbinInstituteofTechnology，Harbin150001，Chinn)Abstract：Sm0othedparticlehydrodynamics(SPH)istestedforsimulatingflowdrivenbyhighspeedunderwaterbody(FDUB)．D。lopinghist。ryofs“percavityinducedbyabodyispredicatedbySPH．ShaP

3、e。fdevel。PedsupercavityderivedbySPHisc0mp8redwithresuItgivenbyprinciple。fjndePendence。fcaVitysecti。nsexpansi。n。fLogvinovich．Ghostpa~iclemeth。dandDummypartic1emethod，thatremedyboundarydeficiencyofSPH，arecombinedtoimplementwallc0nditi0ns．Keywords：supercavity；free

4、surfaceflow；developinghistory；SPH．CLCnumber：O351．2Documentcode：AOIntrOductiOnSmoothedparticlehydrodynamics(SPH)discretizescomputationaldomainnotbygridsormeshesbutbvasetofparticleswithpropertiesofmassandvolume¨．Bytracingthemotionofeachparticle．variationhistory0f

5、thecontinuumconfigurationisobtained．ThemeshdistortionisavoidedinSPHduetoitsmesh．1esspropertv．Forflowdrivenbyhighspeedunderwaterbody(FDUB)meshdistortioncouldappearinFEMwithLagrangianmeshes．InFDUBsupercavityappearssincecavitationnumberislargelyreducedbyhighspeedb

6、odies[．Thesupereavitysurface，actually，isaninterfacebetweentwomediumsj．e．waterandvapor．InSPHaninterface[，．isusuallyregardedasaprofileofparticledistribution．Therefore，themotionofinterfacec0uldbetracednatulrallvbySPH，sinceittracesthemotionofeachparticle．Thisisanot

7、heradvantageofSPHasitisbasedontheLagrangianformulation．Actually，twomainclassesofmethodsforsupercavitvflowsareunderEu1erf_0rmu1ati0n．Thus，comparingwithSPHtheyarenotconvenientintracinginterfaces．Additionally，SPHisusuallyemployedtofreesurfaceflowswhereaconstantpre

8、SSUreconditionisapplied0nfreesurfaces一．Coincidently，asupercavitysurfaceinclassicalopinionisregardedasafeesud-acewithconstantvaporizationpressure‘’一。．Hence，itisnecessarytotes