arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.07410physics.geo-phastro-ph.EPphysics.comp-ph
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AstroSeis --不规则小行星和天体地震波场三维边界元模拟程序

AstroSeis -- A 3D Boundary element modeling code for seismic wavefields in irregular asteroids and bodies

Yuan Tian, Yingcai Zheng

摘要:

我们开发了一个三维弹性边界元法(BEM)的计算机代码,称为AstroSeis,模拟地震波场在一个机构与任意形状,如小行星。除了AstroSeis可以处理任意表面地形外,它还可以处理小行星模型中的液体核心。在我们目前的代码中,固体和液体域都是同质的。对于震源,我们可以使用单个力或力矩张量。AstroSeis是在频域中实现的,并且可以容易地并入与频率相关的Q。代码在MATLAB中,可以直接设置模型来运行我们的代码。频域计算有利于研究天体在周期性力(如引潮力)作用下的长期弹性响应,且不存在其他许多需要体网格划分的方法所存在的数值频散问题。我们的AstroSeis已经通过了其他方法的基准测试,例如正交模求和和直接解方法(DSM)。这个开源的AstroSeis将是研究小行星内部和表面过程的有用工具。

英文摘要:

We developed a 3-D elastic Boundary Element Method (BEM) computer code, called AstroSeis, to model seismic wavefields in a body with an arbitrary shape, such as an asteroid. Besides the AstroSeis can handle arbitrary surface topography, it can deal with a liquid core in an asteroid model. Both the solid and liquid domains are homogenous in our current code. For seismic sources, we can use single forces or moment tensors. The AstroSeis is implemented in the frequency domain and the frequency-dependent Q can be readily incorporated. The code is in MATLAB and it is straightforward to set up the model to run our code. The frequency-domain calculation is advantageous to study the long-term elastic response of a celestial body due to a cyclic force such as the tidal force with no numerical dispersion issue suffered by many other methods requiring volume meshing. Our AstroSeis has been benchmarked with other methods such as normal modes summation and the direct solution method (DSM). This open-source AstroSeis will be a useful tool to study the interior and surface processes of asteroids.

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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