A novel time substep procedure into the classical central difference scheme to derive fourth-order methods in the complex plane

IF 4.4 2区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers & Structures Pub Date : 2024-09-09 DOI:10.1016/j.compstruc.2024.107514
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Abstract

This work is concerned with the development of new fourth-order accurate explicit time integration methods for the solution of wave propagation problems discretized by the finite element method. These novel schemes are derived from the well-known Central Difference time integration method through a proposed time substep procedure formed by either two or three complex substeps. The proposed formulation follows a different approach of standard time integration methods in the sense that results in the time domain are complex numbers, and advantages of such a distinct feature and its relation to the error are presented and discussed. A numerical analysis reveals that the proposed formulation not only enhances the stability but also increases the accuracy when compared to the classical Central Difference method; besides, the computer implementation is very straightforward. Finally, numerical examples are presented and the results are compared with the corresponding ones from other fourth-order methods in order to demonstrate the effectiveness, robustness and potentialities of the proposed formulation.

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在经典中心差分方案中加入新颖的时间子步程序,以推导复平面内的四阶方法
这项研究致力于开发新的四阶精确显式时间积分方法,用于解决用有限元法离散的波传播问题。这些新方案源自著名的中央差分时间积分法,通过一个由两个或三个复数子步组成的时间子步程序得到。提出的方案采用了与标准时间积分法不同的方法,即时域中的结果是复数,并介绍和讨论了这一显著特点的优势及其与误差的关系。数值分析表明,与经典的中心差分法相比,建议的公式不仅增强了稳定性,还提高了精确度;此外,计算机实现也非常简单。最后,介绍了一些数值示例,并将结果与其他四阶方法的相应结果进行了比较,以证明所提公式的有效性、稳健性和潜力。
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来源期刊
Computers & Structures
Computers & Structures 工程技术-工程:土木
CiteScore
8.80
自引率
6.40%
发文量
122
审稿时长
33 days
期刊介绍: Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.
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