Atmospheric Pressure Gas Discharges using VORPAL.pdf

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1、BetterSimulationofAtmosphericPressureGasDischargesusingVORPALPressureGasDischargesusingVORPALAlexandreLikhanskiiTech‐XCorporation*WorkhasbeenpartiallyfundedbNASASBIRPhbyNASASBIRPhaseI&II,COTR:DavidAshpisVORPAL-专业等离子体模拟专家上海锦科信息科技有限公司专业工程软件和技术开发服务提供商www.btitgroup.com

2、info@btitgroupcominfo@btitgroup.comIEEESpectrumWebinarIEEESpectrumWebinarDecember1,20111AtmosphericpressureplasmashaveabroadranggpeofindustrialappplicationsAerospaceEnergyPlasmaPlasmaProcessingMedicine2Whydoesoneneedmodeling?ApplicationsAerospace:DBDs….restPowerSup

3、pppylyggyeometry,,materials,,…AC,DC,RF..?Pulser•Whatistheoptimumpulseduration?•Whatistherisetime?•Whatistherepetitionrate?•Whatisthepowerconsumption?3•Howheavyisit?Complete,comprehensiveplasmamodelrequires:•SolveforchargedspeciesmotioncoupledwithPoissonSolver•Inclu

4、deallrelevantplasmaprocesses•Resolveallrelevantspatialandtimescalesspatialandtimescales•Useapppppropriateppyhysicalmodelforplasmadescriptionatparticularconditions•CouplewithCFDcode4Themodelneedstoincludecomplexplasmaprocesses•Ionization•Recombination•Attachment•Det

5、achment•Photoionization•Detailedairchemistry?•Excitation?•Fastheating?5Themodelneedstoresolveplasma/systemspatialscalesSpatialscales:Spatialscales:Plasmasheathsizeis~10micronsmicrongridsizePlasmalengthisseveralmillimetersmillimeternumericaldomainforplasmagenerati

6、onSurfacechargeaccumulationSurfacechargeaccumulationcentimeternumericaldomainforcentimeternumericaldomainforsurfacecharging106-107gridpointsforjust2D6Themodelneedstoresolveplasma/systemtimescalesTimescales:Timescales:Electrondriftvelocity~106m/spicosecondtimestep

7、duetoCFLThecycleofdeviceoperation~msmillisecondtimeintervalshouldbecomputed109timepointsNeedtousestate-of-the-artnumericaltechniques7ThemodelneedsbothtosolveappropriateeqpquationsandtobecomputationallyyefficientModelComplexityDrift-diffusion2-moment5-momentKinetic

8、approachapproxitimatiionmodldelmodldel–PtiliCllParticleinCell•“Easy”to•Drift-diffusion+•Momentum•Detailedimplementelectronandenergyplasma•Bestfor