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ID:46628818
大小:2.37 MB
页数:9页
时间:2019-11-26
《基于非结构网格格点FVTD算法的电磁散射模拟》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第45卷第3期2013年6月南京航南尿舰JournalofNanjingU空nlV航天大学学报ersityofAeronautics&AstronauticsV01.45No.3Jun.2013基于非结构网格格点FVTD算法的电磁散射模拟高煜垄陈红全(南京航空航天大学航空宇航学院,南京,210016)摘要:为了利用格点数值模拟复杂外形的电磁散射场,研究了基于非结构网格格点的时域有限体积算法。该算法借鉴计算流体力学的做法,采用Steger—Warming通量分裂和近似黎曼解两种方法处理通量运算,采用四步Runge-Kutta格式进行时间推进求解。本文用发展的算法数值模拟了包括鼓包、
2、舱体以及外挂干扰的复杂外形电磁散射场,并给出了对应的雷达散射截面。算例表明:两种通量运算计算得到的双站雷达散射截面结果一致,且计算效率相当;舱体、鼓包以及外挂对飞行器主体的电磁散射特性均有影响,其中外挂对主体干扰尤为明显。由于采用了基于非结构网格格点的算法,特别适合处理多体干扰等复杂情形。关键词:格点格式;时域有限体积;Steger-Warming通量分裂;近似黎曼解;雷这散射截面中图分类号:V218文献标志码:A文章编号:1005—2615(2013)03—0415—09ElectromagneticScatteringSimulationBasedonCell·-Vertex
3、Unstructured_-GridFVTDAlgorithmGaoYukun,ChenHongquan(CollegeofAerospaceEngineering,NanjingUniversityofAeronautics&Astronautics,Nanjing,210016,China)Abstract:Inordertousegridpointsforsimulatingthescatteredelectromagneticfieldswithcomplicatedgeometries,afinite—volumetime—domainalgorithmbasedonc
4、ell—vertexoftheunstructuredgridsisstudied.Referringtotheapproachusedincomputationalfluiddynamics,bothSteger—Warmingfluxvec—torsplittingandapproximateRiemannsolverareintroducedindealingwiththecomputationoffluxre—latedtothegoverningequations,andanexplicitfour—stageRunge—Kuttaschemeisemployedint
5、imedis—cretization.Byusingthedevelopedalgorithm,scatteredfieldsandbistaticradarcrosssectionarecalcu—latedforcomplicatedcasesofaerodynamicshapeswithcavity,externalobstacleoranexternalstore.Numericalexamplesshowthatboththebistaticradarcrosssectionandthecomputationalefficiencyarenearlythesamebyu
6、singeitherSteger—WarmingfluxvectorsplittingorapproximateRiemannsolver.Theresultsalsoshowthatthescatteredcharacteristicsofthemainaerodynamicshapeswithorwithoutcavity,externalobstacleOranexternalstoreareobviouslydifferent,particularlyforthecaseofaerody—namicshapeswithanexternalstore.Additionall
7、y,thepresentedmethodhastheabilitytoaccommodatemorecomplicatedgeometriesduetotheuseofcellvertexoftheunstructuredgrids。Keywords:cell—vertexscheme;finite—volumetime—domain;Steger—Warmingfluxvectorsplitting;ap—proximateRiemannsolver;radarcrosssec
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