初值问题系统的隐式二阶龙格-库塔配置方法

D.G. Yakubu, A.M. Kwami
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引用次数: 6

摘要

本文介绍了一类新的隐式二阶龙格-库塔配置方法,该方法设计用于方程组的数值解,并展示了如何在一个高效的并行计算环境中实现它们。我们还讨论了与大系统相关的困难,以及在这种情况下,如何利用方法中的二阶导数项。我们考虑了两种适用于求解稳定系统的改进方法。第一个修改涉及到在积分区间的两个端点引入高斯内配点外的配点法,第二个修改涉及到引入另一类基本二阶导数方法。通过这些修改,每一步实现的函数求值更少,从而产生成本更低且易于实现的方法。研究了这些方法的稳定性,并给出了每个修正版本的数值结果,以说明修正方法的计算效率。
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Implicit two-derivative Runge–Kutta collocation methods for systems of initial value problems

We introduce a new class of implicit two-derivative Runge–Kutta collocation methods designed for the numerical solution of systems of equations and show how they have been implemented in an efficient parallel computing environment. We also discuss the difficulty associated with large systems and how, in this case, one must take advantage of the second derivative terms in the methods. We consider two modified versions of the methods which are suitable for solving stable systems. The first modification involves the introduction of collocation at the two end points of the integration interval in addition to the Gaussian interior collocation points and the second involves the introduction of a different class of basic second derivative methods. With these modifications, fewer function evaluations per step are achieved, resulting into methods that are cheap and easy to implement. The stability properties of these methods are investigated and numerical results are given for each of the modified version to illustrate the computational efficiency of the modified methods.

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