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Reduced order modeling for a nonlocal approach to anomalous diffusion problems.

机译:针对异常扩散问题的非局部方法的降阶建模。

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摘要

With the recent advances in using nonlocal approaches to approximate traditional partial differential equations(PDEs), a number of new research avenues have been opened that warrant further study. One such path, that has yet to be explored, is using reduced order techniques to solve nonlocal problems. Due to the interactions between the discretized nodes or particles inherent to a nonlocal model, the system sparsity is often significantly less than its PDE counterpart. Coupling a reduced order approach to a nonlocal problem would ideally reduce the computational cost without sacrificing accuracy. This would allow for the use of a nonlocal approach in large parameter studies or uncertainty quantification. Additionally, because nonlocal problems inherently have no spatial derivatives, solutions with jump discontinuities are permitted. This work seeks to apply reduced order nonlocal concepts to a variety of problem situations including anomalous diffusion, advection, the advection-diffusion equation and solutions with spatial discontinuities. The goal is to show that one can use an accurate reduced order approximation to formulate a solution at a fraction of the cost of traditional techniques.
机译:随着使用非局部方法逼近传统偏微分方程(PDE)的最新进展,已经开辟了许多值得进一步研究的新研究途径。一种尚待探索的途径是使用降阶技术来解决非局部问题。由于非局部模型固有的离散节点或粒子之间的相互作用,系统稀疏性通常显着小于其PDE对应物。理想情况下,将降阶方法与非局部问题耦合将可以减少计算成本,而不会牺牲准确性。这将允许在大参数研究或不确定性量化中使用非局部方法。另外,由于非局部问题本来就没有空间导数,因此允许具有跳跃间断的解决方案。这项工作旨在将降阶非局部概念应用于各种问题情况,包括反常扩散,对流,对流扩散方程和具有空间不连续性的解决方案。目的是表明人们可以使用精确的降阶近似来制定解决方案,而成本仅为传统技术的一小部分。

著录项

  • 作者

    Witman, David R.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Mathematics.;Computer science.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 106 p.
  • 总页数 106
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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