arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.09812math.NAcs.NA
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变密度介质中声波传播的高效稳定Finite Difference模型

Efficient and Stable Finite Difference Modelling of Acoustic Wave Propagation in Variable-density Media

Da Li, Keran Li, Wenyuan Liao

摘要:

本文考虑了一种新的显式紧致高阶有限差分格式的发展和分析,该格式适用于散度型声波方程,广泛用于描述地震波在具有可变介质密度和声速的非均匀介质中的传播。新格式是紧凑的,在空间上具有四阶精度,在时间上具有二阶精度。该格式的紧致性是通过所谓的组合有限差分法得到的,该方法利用了空间导数的边界值,并且这些边界值是通过单侧有限差分近似得到的。通过经验稳定性分析,得到了新格式的条件稳定性的Currant-Friedrichs-Lewy(CFL)条件.四个数值算例验证了新格式的收敛性和有效性。文中还对一个理想匹配层边界条件下的波传播问题进行了数值计算。

英文摘要:

In this paper, we consider the development and analysis of a new explicit compact high-order finite difference scheme for acoustic wave equation formulated in divergence form, which is widely used to describe seismic wave propagation through a heterogeneous media with variable media density and acoustic velocity. The new scheme is compact and of fourth-order accuracy in space and second-order accuracy in time. The compactness of the scheme is obtained by the so-called combined finite difference method, which utilizes the boundary values of the spatial derivatives and those boundary values are obtained by one-sided finite difference approximation. An empirical stability analysis has been conducted to obtain the Currant-Friedrichs-Lewy (CFL) condition, which confirmed the conditional stability of the new scheme. Four numerical examples have been conducted to validate the convergence and effectiveness of the new scheme. The application of the new scheme to a realistic wave propagation problem with Perfect Matched Layer boundary condition is also validated in this paper as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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