結(jié)構(gòu)-直角網(wǎng)格下時(shí)域有限體積法在計(jì)算電磁中的應(yīng)用研究.pdf

1、分類號(hào)：V211密級(jí)：學(xué)校代碼：10699學(xué)號(hào)：036056157西北工業(yè)大學(xué)碩士學(xué)位論文(學(xué)位研究生)結(jié)構(gòu)／直角網(wǎng)格下時(shí)域有限體積法在計(jì)算電磁中的應(yīng)用研究作者陳剛指導(dǎo)教師高正紅教授學(xué)科(專業(yè))飛行器設(shè)計(jì)西北工業(yè)大學(xué)航空學(xué)院2006年3月西安AbstractBasedontheconceptofaerodynamicandstealthsynthesisdesignforaircraftandmissileconfigurations，

2、acharacteristicbased，F(xiàn)initeVolumemethodinTimeDomain(FVTD)，whichstemsfromthetechniquesofComputationalFluidDynamics(CFD)hasbeenappliedtocomputationalelectromagnetism(CEM)graduallyduringtherecentdecadesGroundedonplentyoflit

3、eratures，thisthesishasexploredcellcentered，electromagneticvariablescollocatedFVTDalgorithmswhileusingstructuredandunstructuredgridssuccessivelyInthisthesis，asolverforsimulationofpropagationofplanarelectromagneticwaveinfr

4、eeormulti—mediumspaceinIDcasesandasolverforscatteringproblemsin2Deasesusingstructuredgrids，andasolverforscatteringproblemsin3DcasesusingadaptiveCartesiangridsaredevelopedinorderTherelativelyhighorderprecisionofthesolvers

5、hasbeenvalidatedbyquantityofnumericaItestcases1nthestructuredFVTDalgorithmafter1eftandrightstatevariableshavebeenobtainedusingtheVanLeer’sMUSCLschemefluxformulationoneellInterfaceisobtainedbyusingStegerWarmingfluxvectors

6、plittingorapproximateRiemannsolutionbothofwhicharepresentedsuccessivelyanddemonstratedessantialequalbynumericalresults0neefluxcalculationareaccomplishedthesemidiscretizationequationsarecastintoordinarydi疵rentiaiequations

7、whichcanbesolvedbyseverelnumericalmethodsincludingthetwoandfourstepsRunge—KuttaalgorithmadoptedinIDand2DeasesrespectivelyinthisthesisTos“dythedissipationanddispersioncharacteristicsofMUSCLschemeandtwo—fourstepsRange—Kutt

8、aintegrationmentionedabove，stabilltyanalysisusingModifiedPDEandFouriermethodsisperformedfirstlyInthenextchapterthestructuredalgorithmisappliedtosimulatethepropagationofplanarelectromagneticwaveinfreeormulti—mediumspaceTh

9、estudyofimpactofdifferentMUSCLschemes，gridresolution，CFLnumbersande：dformsonaccuracyanddissipativeanddispersivefeaturesisperformedandtherangesofvalueforcorrespondingparametersarediscussedandsuggestedbasedontheworkdoneint

10、hispartFoundedontheformerlywork，scatteringproblemsofseveral2DperfectelectricalconductorsincludingcylinderandNACA0012airfoilalesolvedThefactthatcomputationalresultsofsurfaceinducedelectriccurrentandbiostaticRadarCrossSect

11、ion(RCS)agreequitewellwiththeoryvaluesorresultsfromreferencesdemonstratesthattheFVTDfsahighaccuratemethodforcomputationalelectromagneticsandthesolverusing2Dstructuredgridsdevelopediscapableforthescatteringproblemsoverqui

12、tewiderangefromlowtohighfrequencyandalsoapplicabletopracticalshapeinengineeringMeanwhile，throu【ghthediscussionofthenumericalresultsofcylindertheimpactsoftheparametersinvolvedontheresultsareinvestigatedandtheallowablevalu

13、erangesoftheparametersarealsosuggestedTheunstructuredFVTDalgorithmadoptedisstillcastintheformofsemi—discretizationAfterleftandrightstatevariableshavebeenobtainedbythereconstructionmethod，approximateRiemmanSolutionisintro