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arXiv 1806.04830math.NAcs.LGcs.NA
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深度多尺度模型学习

Deep Multiscale Model Learning

Department of Mathematics, Texas A&M University(德克萨斯大学数学系);Department of Mathematics, The Chinese University of Hong Kong(香港中文大学数学系);Department of Mathematics & Institute for Scientific Computation (ISC), Texas A&M University(德克萨斯大学数学系与科学计算研究所)

Yating Wang, Siu Wun Cheung, Eric T. Chung, Yalchin Efendiev, Min Wang

AI总结:

本文提出利用深度学习与局部多尺度模型降阶方法,通过数据和物理建模概念提升流体多尺度模拟的预测能力。

摘要:

本文的目标是设计新型多层神经网络架构,用于考虑观测数据和物理建模概念的流体多尺度模拟。我们的方法结合深度学习概念与局部多尺度模型降阶方法,预测流体动力学。使用降阶模型对于构建稳健的深度学习架构至关重要,因为降阶模型提供较少的自由度。流体动力学可以视为多层网络。更准确地说,时间瞬间n+1的解(例如压力和饱和度)取决于时间瞬间n的解和输入参数,如渗透率场、强迫项和初始条件。可以将解视为多层网络,其中每一层通常是一个非线性前向映射,层数与内部时间步数相关。我们将依赖严格的模型降阶概念来定义每个层的未知数和连接。在每一层中,我们的降阶模型将提供一个前向映射,该映射将通过可用数据进行修改(“训练”)。使用降阶模型至关重要,因为它们将识别影响区域和适当的变量数量。由于可用数据有限,训练将补充计算数据,并在数据丰富和数据贫乏的模型之间进行插值。我们还将使用深度学习算法来训练降阶模型离散系统的元素。我们将介绍我们方法的主要成分和数值结果。数值结果表明,使用深度学习和多尺度模型,可以提高受可用数据条件的前向模型。

英文摘要:

The objective of this paper is to design novel multi-layer neural network architectures for multiscale simulations of flows taking into account the observed data and physical modeling concepts. Our approaches use deep learning concepts combined with local multiscale model reduction methodologies to predict flow dynamics. Using reduced-order model concepts is important for constructing robust deep learning architectures since the reduced-order models provide fewer degrees of freedom. Flow dynamics can be thought of as multi-layer networks. More precisely, the solution (e.g., pressures and saturations) at the time instant $n+1$ depends on the solution at the time instant $n$ and input parameters, such as permeability fields, forcing terms, and initial conditions. One can regard the solution as a multi-layer network, where each layer, in general, is a nonlinear forward map and the number of layers relates to the internal time steps. We will rely on rigorous model reduction concepts to define unknowns and connections for each layer. In each layer, our reduced-order models will provide a forward map, which will be modified ("trained") using available data. It is critical to use reduced-order models for this purpose, which will identify the regions of influence and the appropriate number of variables. Because of the lack of available data, the training will be supplemented with computational data as needed and the interpolation between data-rich and data-deficient models. We will also use deep learning algorithms to train the elements of the reduced model discrete system. We will present main ingredients of our approach and numerical results. Numerical results show that using deep learning and multiscale models, we can improve the forward models, which are conditioned to the available data.

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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