Publisher DOI: 10.1016/j.cma.2018.08.002
Title: Equivalent Legendre polynomials: Numerical integration of discontinuous functions in the finite element methods
Language: English
Authors: Abedian, Alireza 
Düster, Alexander 
Issue Date: Jan-2019
Source: Computer Methods in Applied Mechanics and Engineering (343): 690-720 (2019-01)
Abstract (english): 
The efficiency of numerical integration of discontinuous functions is a challenge for many different computational methods. To overcome this problem, we introduce an efficient and simple numerical method for the integration of discontinuous functions on an arbitrary domain. In the proposed method, the discontinuous function over the domain is replaced by a continuous equivalent function using Legendre polynomials. The method is applicable to all Ansatz spaces with continuous basis functions, and it allows to use standard numerical integration methods in the entire domain. This imposed continuous function is called equivalent Legendre polynomial (ELP). Several numerical examples serve to demonstrate the efficiency and accuracy of the proposed method. Based on 2D and 3D problems of linear elastostatics, the introduced method is further evaluated in the concept of the fictitious domain finite element methods.
ISSN: 0045-7825
Journal: Computer methods in applied mechanics and engineering 
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Document Type: Article
Project: High-Order Immersed-Boundary-Methoden in der Festkörpermechanik für generativ gefertigte Strukturen 
More Funding information: Deutsche Forschungsgemeinschaft (DFG)
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