A Bayesian Approach to Estimating Background Flows from a Passive Scalar

A Bayesian Approach to Estimating Background Flows from a Passive Scalar
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估计被动标量背景流的贝叶斯方法

DOI:
10.1137/19m1267544
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发表时间:
2020
期刊:
SIAM/ASA Journal on Uncertainty Quantification
影响因子:
--
通讯作者:
Krometis, Justin
Krometis, Justin
中科院分区:
--
文献类型:
--
作者:
Borggaard, Jeff;Glatt-Holtz, Nathan;Krometis, Justin

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我们考虑估计背景流场的统计逆问题(例如,空气或水)从被动标量(例如,溶质的浓度),这是一种可视化复杂流体流动的常用实验方法。 这里的未知数是一个向量场,它由大量或无限多的自由度指定。由于逆问题是不适定的,即,可能有许多或没有背景流匹配一组给定的观测,我们通过布局一个函数分析和贝叶斯框架来处理这个问题。在此过程中,我们利用统计推断和伴随方法在无限维问题上的重大最新进展。然后,我们确定有趣的例子问题,表现出简单和复杂的结构后的措施。我们使用这些例子进行大规模的马尔可夫链蒙特卡罗方法的基准,近年来开发的无限维设置。我们的研究结果表明,这些方法是能够解决复杂的多峰后验在高维。
We consider the statistical inverse problem of estimating a background flow field (e.g., of air or water) from the partial and noisy observation of a passive scalar (e.g., the concentration of a solute), a common experimental approach to visualizing complex fluid flows. Here the unknown is a vector field that is specified by a large or infinite number of degrees of freedom. Since the inverse problem is ill-posed, i.e., there may be many or no background flows that match a given set of observations, we regularize it by laying out a functional analytic and Bayesian framework for approaching this problem. In doing so, we leverage substantial recent advances in statistical inference and adjoint methods for infinite-dimensional problems. We then identify interesting example problems that exhibit posterior measures with simple and complex structure. We use these examples to conduct a large-scale benchmark of Markov chain Monte Carlo methods developed in recent years for infinite-dimensional settings. Our results indicate that these methods are capable of resolving complex multimodal posteriors in high dimensions.
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