Modelling uncertainties in phase-space boundary integral models of ray propagation

Modelling uncertainties in phase-space boundary integral models of ray propagation
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射线传播相空间边界积分模型的不确定性建模

DOI:
10.1016/j.cnsns.2019.104973
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发表时间:
2020
影响因子:
3.9
通讯作者:
Bajars J
Bajars J
中科院分区:
数学2区
文献类型:
--
作者:
Bajars J

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最近提出的相空间边界积分模型的射线密度的随机传播,并为第一次,这个模型和参数的不确定性产生的基础物理模型之间的显式连接。特别是,一个弱噪声扰动的传播速度的渐近分析是用来推导出表达式的概率分布的相空间边界坐标运输后沿着不确定的,并在一般弯曲,射线轨迹。此外,模型中提出的多边形域内的边缘的位置,以及小规模的几何波动引起的粗糙的边界反射方面的几何不确定性。不确定源项也以随机分布的点源和不确定边界数据的形式考虑。一系列的数值实验,然后进行说明这些不确定性模型在二维凸多边形区域。
A recently proposed phase-space boundary integral model for the stochastic propagation of ray densities is presented and, for the first time, explicit connections between this model and parametric uncertainties arising in the underlying physical model are derived. In particular, an asymptotic analysis for a weak noise perturbation of the propagation speed is used to derive expressions for the probability distribution of the phase-space boundary coordinates after transport along uncertain, and in general curved, ray trajectories. Furthermore, models are presented for incorporating geometric uncertainties in terms of both the location of an edge within a polygonal domain, as well as small scale geometric fluctuations giving rise to rough boundary reflections. Uncertain source terms are also considered in the form of stochastically distributed point sources and uncertain boundary data. A series of numerical experiments is then performed to illustrate these uncertainty models in two-dimensional convex polygonal domains.
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