叶康生, 邱廷柱. 二阶非线性常微分方程边值问题有限元p型超收敛计算[J]. 工程力学, 2019, 36(12): 7-14. DOI: 10.6052/j.issn.1000-4750.2019.01.0005
引用本文: 叶康生, 邱廷柱. 二阶非线性常微分方程边值问题有限元p型超收敛计算[J]. 工程力学, 2019, 36(12): 7-14. DOI: 10.6052/j.issn.1000-4750.2019.01.0005
YE Kang-sheng, QIU Ting-zhu. A p-TYPE SUPERCONVERGENT RECOVERY METHOD FOR FE ANALYSIS ON BOUNDARY VALUE PROBLEMS OF SECOND-ORDER NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS[J]. Engineering Mechanics, 2019, 36(12): 7-14. DOI: 10.6052/j.issn.1000-4750.2019.01.0005
Citation: YE Kang-sheng, QIU Ting-zhu. A p-TYPE SUPERCONVERGENT RECOVERY METHOD FOR FE ANALYSIS ON BOUNDARY VALUE PROBLEMS OF SECOND-ORDER NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS[J]. Engineering Mechanics, 2019, 36(12): 7-14. DOI: 10.6052/j.issn.1000-4750.2019.01.0005

二阶非线性常微分方程边值问题有限元p型超收敛计算

A p-TYPE SUPERCONVERGENT RECOVERY METHOD FOR FE ANALYSIS ON BOUNDARY VALUE PROBLEMS OF SECOND-ORDER NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS

  • 摘要: 该文提出二阶非线性常微分方程边值问题有限元求解的p型超收敛算法。该法基于有限元解答中结点解的超收敛特性,以单元端部的有限元解作为单元边界条件,通过泰勒展开技术在单个单元上建立了单元解近似满足的线性常微分方程边值问题,对该局部线性边值问题采用单个高次元进行有限元求解获得该单元上的超收敛解,对每个单元实施上述过程可获得全域的超收敛解。该法为后处理法,且后处理计算仅在单个单元上进行,通过很少量的计算即能显著提高解答的精度和收敛阶。数值结果显示,该法高效、可靠,是一个颇具潜力的方法。

     

    Abstract: It presents a p-type superconvergent recovery method for the finite element analysis on two-point boundary value problems (BVPs) of second-order nonlinear ordinary differential equations. Based on the superconvergence property of nodal values, a linear two-point BVP which approximately governs the solutions on each element is set up by setting the elements' end values in FE solutions as boundary conditions and linearizing the governing differential equations via Taylor expansion technique. This local linear BVP is solved by using a higher order element from which the solution on each element is recovered. This method is a post-processing approach and the recovery computation is carried out on each element separately. It can improve the accuracy and convergence rate of the solutions significantly with a small computation. Numerical examples demonstrate that this method is efficient, reliable and potential.

     

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