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Intermediate asymptotics of nonlinear degenerate parabolic PDEs via a renormalization group approach: A numerical study.

机译:非线性简并抛物线形PDE的中间渐近性通过重归一化组方法:一项数值研究。

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摘要

Scaling laws always reveal a very important property of the phenomena under consideration: their self-similarity, i.e., the property of reproducing themselves on different time and space scales. This property gives important evidence of a type of stabilization, the so called intermediate asymptotic regime, which describes the behavior of general solutions in the range where these solutions no longer depend on the details of the initial and/or boundary conditions. This is the regime where the essential physics of the phenomena is revealed.; This dissertation involves a preliminary look at a powerful way to numerically obtain such self-similar behavior by introducing a physically based twist on the direct numerical integration of the associated PDE. The impetus for this twist stems from the philosophy of the RG, or Renormalization Group, for which the numerical implementation has been dubbed nRG. The power of this method lies in its ability to capture the full asymptotic behavior in a wide variety of cases (anomalous exponents, relevant perturbations etc.), with no a priori information other than the PDE and some simple scaling relations. In addition, the clever twist allows nRG to be performed efficiently on even modest computing facilities.
机译:标度定律总是揭示所考虑现象的一个非常重要的性质:它们的自相似性,即在不同时空尺度上再现自身的性质。此属性提供了一种稳定类型的重要证据,即所谓的中间渐近形式,它描述了一般解在这些解不再依赖于初始和/或边界条件的细节的范围内的行为。这是揭示现象本质物理机制的一种机制。本文通过对相关PDE的直接数值积分引入基于物理的扭曲来初步研究一种强大的方法,以数值方式获得这种自相似行为。这种扭曲的动力源于RG或Renormalization Group的理念,其数值实现被称为nRG。该方法的强大之处在于它能够捕获各种情况下的全部渐近行为(异常指数,相关扰动等),除了PDE和一些简单的比例关系外,没有先验信息。此外,巧妙的扭曲功能甚至可以在中等计算设备上高效执行nRG。

著录项

  • 作者

    Isaia, Vincenzo Michael.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Mathematics.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 146 p.
  • 总页数 146
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 数学;
  • 关键词

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