CFD的现状及未来发展

CFDCFDzzCFDCFDRANS/EulerRANS/EulerCFDCFDCFDCFDzzEulerEulerRANSRANSCFDCFDzzzzzzzzzzzzzCFDCFDzCFDCFDvs.CFDvs.zzCFDCFDzzCFDCFDCFDCFDz“CFD”“”CFDvs.CFDvs.zz20042004E.N.E.N.TinocoTinoco““CFDCFDCFDCFD……....CFDCFDCFDCFDCFDCFD””InstituteofFluidMechanicsCFDCFDAirbusAirbusCFDCFDzzEuropeanAeronautics2020VisionEuropeanAeronautics2020Vision2020202050%50%50%50%50%50%zz̅̅HighHigh--ReynoldsCFDproducingReynoldsCFDproducing““DataforDesignDataforDesign””CFDCFD““””̅̅HighHigh--ReynoldsW/TtestingforReynoldsW/Ttestingfor““PerformanceCheckPerformanceCheck--outout””““””̅̅W/TtestingmorefocusedupondatabaseforW/Ttestingmorefocusedupondatabasefor““MethodMethodValidation/CertificationValidation/Certification””““//””̅̅ReductionofconventionalwindReductionofconventionalwind--tunneltestingtunneltesting™™20%by200820%by2008™™50%by201550%by2015™™75%by202575%by2025Propeller•Propellerswirlleadstoasymmetricflow,positivelocalAOAsforthewingonthesideofupwardpropellerrotation,negativelocalAOAsontheother•Unsteadysimulations,TAU,chimeragrids•Prop,Navier-Stokes:245h,32Proc.•Prop+wing,Euler:105h,32Proc.:strongunsteadyfluctuationsduetoperiodicpassageofbladetipvorticesHelicopter•Rotating,unsteadyflow•Verystrongeffectsoffluid/structurecoupling•Largeareasofseparatedflows•Dynamicstall•StrongvortexinteractionEC145,actuatordisksBO105CFDvs.CFDvs.zzzzzzCFDCFDzz̅̅Spacecraft•Unsteadyflow,buffet¾¾¾¾¾¾¾¾……ReynoldsStressModel(SSG/LRRReynoldsStressModel(SSG/LRR--ωω))ONERAM6,α=6.06,M=0.84pressuredistributionsfrictionlinesTAU-CodeB.EisfeldDPWDPWzzCFDCFD————AIAAAIAACFDDragPredictionCFDDragPredictionWorkshopWorkshopDPWDPWzzzzDPWDPWDPWDPW--II20012001DPWDPW--IIII20032003DPWDPW--IIIIII20062006gridsareeverything?zThetruthofthephrase”gridsareeverything”wascontinuallyreinforcedduringDPW-II.Lee-Rausch,2004zCFDgridsareeverything?DPWCFDCFDCFDFujiiFujiiCFDCFDzzzzFujiiFujiiCFDCFDzzzzRANSCFDRANSCFDzCFDCFD80809090zz3030CFDCFDCFDCFDCFDCFDzzCFDCFDzzzzCFDCFDzzCFDCFDvs.vs.zzCFDCFDCFDCFDzzCFDCFDCFDCFD;;CFDCFDzz33CFDCFDzzzz2222zz2222TVDTVD55WENOWENOCFDCFDCFDCFDCFDCFDCFDCFDzzzzCFDCFDzzzzzz……zzzzDNSDNSCFDCFDDNSDNSCFDCFD¾¾¾¾Tosimulate1secofflighttime,usingaTosimulate1secofflighttime,usingasupercomputerof10supercomputerof101212Flops,itisFlops,itisrequiredrequiredseveralthousandyearsseveralthousandyearsandand10101616gridpoints.gridpoints.DNSDNSCFDCFDzzzz……//LESLESDNSDNSzzLESLESNSNS,,zzLESLESDNSDNSRANSRANSLESLES““””LES/RANSLES/RANSzzLES/RANSLES/RANSRANSRANSLESLES,,Hypersonics•DES,M=7DESsimulationofarealisticre-entrycapsuleatMach7(vorticityinthewake)AveragedbasepressureataxisymmetriccylinderwakeDES-validationoftheaxisymmetriccylinderwake(turbulentkineticenergy)ExperimentExperimentCFDCFDzzCFDCFDzz//zzCFDCFDzzCFDCFDCFDCFD““””CFDCFDDLRDLR--F6F6„„72M72M„„10(4096CPU),4.5(128CPU)„„35GB35GB„„MPI+OpenMPMPI+OpenMP„„128/512/1024/2048/4096128/512/1024/2048/4096„„2250/2048CPU2250/2048CPU„2006CPU20NASANASASGIOrigin38001024CPUs1.228/20011512CPUs3.072/NASA2004102620SGIAltix300010240CPUs60/NALNALAirbusHPCMeansrequirementsAirbusHPCMeansrequirementsEffectiveTFLOPS01020304050601994199619982000200220042006200820101Gflops1Tflops50TflopsTechnologyStepMoore’sLawMoore’sLawTechnologySteps4GridComputing–betterexploitationofresources4Processordualcore4Sustainable50%ofPeakperformanceonPCcluster4NewalgorithmsforCFDCFDzzCFDCFDCFDCFDzzLES/RANSLES/RANSRANSRANS55--1010LESLESDNSDNSzzCFDCFDzz22CFDCFDDGDG22zzCFDCFDzzCFD¾¾¾¾ClosureClosurezzCFDisexcitingCFDisexcitingandfun!andfun!zzItwillmakeyouItwillmakeyourichbeyondyourrichbeyondyourwildestdreams!wildestdreams!zzTastesgreat!LessTastesgreat!Lessfilling!filling!