CFS-PML在探地雷达FDTD法模拟中应用
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Release time:2020-08-08 DOI number:10.7511/dllgxb201506001 Journal:大连理工大学学报 Place of Publication:中国 Key Words:复频移卷积完全匹配层；单轴各向异性完全匹配层；时域有限差分法；探地雷达；正演模拟 Abstract:探地雷达(GPR)数值模拟中,为了使截断边界处不产生人为的反射波,需要加载边界条件.目前常用的完全匹配层(PML)边界对隐失波,低频波,掠角波等不能很好地吸收.为此,在时域有限差分(FDTD)法中引入复频移卷积完全匹配层(CFS-PML).从二维TM波的Maxwell方程组出发,阐述了CFS-PML边界条件的原理,推导了CFS-PML边界加载的离散差分公式,给出了CFS-PML边界条件的参数选取原则.应用均匀介质中GPR波场快照,对比了截断处没有加载边界条件,加载3种不同边界条件的边界处反射波的强弱,实例说明单轴各向异性完全匹配层(UPML),CFS-PML边界条件具有较好的吸收效果.为了进一步对比UPML与CFS-PML的吸收效果,设置了双层介质狭长模型,通过波场快照与全局反射误差证明了CFS-PML对隐失波,低频波,掠角波的吸收较UPML效果更佳. Co-author:冯德山, 吴奇 First Author:石明 Indexed by:Applied Research Document Code:DOI：10.7511/dllgxb201506001 Discipline:地质资源与地质工程 Document Type:J Volume:55 Issue:6 Translation or Not:no Date of Publication:2015-06-01 -
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