摘要
利用空间外推将多次透射边界条件推广以提高这一边界在时域计算中的精度。对全波场仅由入射波构成及由入射波和充分发育的反射波构成两种情况导出了边界反射系数的频域公式。从时域计算精度角度分析了边界反射系数以阐明在透射大角度入射行进波动和消减运动方面推广边界的优点。
The multi-transmitting boundary condition has been generalized using spaceextrapolation to improve accuracy of the boundary condition in the time domain computa-tion. Refiection coefficients of the boundary in the frequency domain are formulated for twocases, in which the total wave fields are composed of the incident wave only and the incidentwave plus the fully developed refiecti on wave,respectively. The reflection coefficients arethen analyzed from a viewpoint of accuracv of the boundary in the time domain to illumi-nateadvantages of the generalized boundary over the previous one in reducing reflections ofthe traveling waves at large incident angles and the incident evanescent motion.
出处
《力学学报》
EI
CSCD
北大核心
1995年第1期69-78,共10页
Chinese Journal of Theoretical and Applied Mechanics
基金
地震科学联合基金
关键词
多次透射边界
标量波
有限元
应力波
multi-transmitting boundary,scalar wave, extrapolation,transient-state wavemotion.steady-state wave motion
