arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.01255math.NAcs.NA
收藏

磁流体动力学发电模型中的降维:维度分析与主动子空间

Dimension reduction in MHD power generation models: dimensional analysis and active subspaces

Colorado School of Mines(科罗拉多矿业学院);Sandia National Laboratories(桑迪亚国家实验室)

Andrew Glaws, Paul G. Constantine, John Shadid, Timothy M. Wildey

AI总结:

本文研究了通过维度分析和主动子空间方法降低MHD发电模型输入维度的两种方法,探讨了其数学联系,并通过简化哈特曼问题和大规模计算模型验证了降维对理解驱动因素的作用。

摘要:

磁流体动力学(MHD)研究电导流体,可用于高效低排放发电。当前计算模型帮助工程师研究发电机设计,但模型计算成本高,难以研究输入参数对输出预测的影响。本文研究了两种降维方法:基于输入单位的经典维度分析和揭示影响输出最大的输入子空间的主动子空间。同时回顾了两种方法的数学联系,以实现一致应用。降维提供了对MHD发电模型驱动因素的见解。本文研究了具有闭合形式表达的简化哈特曼问题和具有伴随能力的大规模计算模型,以验证主动子空间的估计。

英文摘要:

Magnetohydrodynamics (MHD)---the study of electrically conducting fluids---can be harnessed to produce efficient, low-emissions power generation. Today, computational modeling assists engineers in studying candidate designs for such generators. However, these models are computationally expensive, so studying the effects of the model's many input parameters on output predictions is typically infeasible. We study two approaches for reducing the input dimension of the models: (i) classical dimensional analysis based on the inputs' units and (ii) active subspaces, which reveal low-dimensional subspaces in the space of inputs that affect the outputs the most. We also review the mathematical connection between the two approaches that leads to consistent application. The dimension reduction yields insights into the driving factors in the MHD power generation models. We study both the simplified Hartmann problem, which admits closed form expressions for the quantities of interest, and a large-scale computational model with adjoint capabilities that enable the derivative computations needed to estimate the active subspaces.

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。

↑