n-sided polygonal hybrid finite elements involving element boundary integrals only for anisotropic thermal analysis

• Autorzy: Cao R. F. , Zhao X. J. , Lin W. Q. , Wang H.

Identyfikatory

DOI

10.24423/aom.3434

• Języki publikacji: EN

Abstrakty

EN

As a combination of the traditional finite element method and boundary element method, the n-sided polygonal hybrid finite element method with fundamental solution kernels, named as HFS-FEM, is thoroughly studied in this work for two-dimensional heat conduction in fully anisotropic media. In this approach, the unknown temperature field within the polygon is represented by the linear combination of anisotropic fundamental solutions of problem to achieve the local satisfaction of the related governing equations, but not the specific boundary conditions and the continuity conditions across the element boundary. To tackle such a shortcoming, the frame temperature field is independently defined on the entire boundary of the polygonal element by means of the conventional one-dimensional shape function interpolation. Subsequently, by the hybrid functional with the assumed intra- and inter-element temperature fields, the stiffness equation can be obtained including the line integrals along the element boundary only, whose dimension is reduced by one compared to the domain integrals in the traditional finite elements. This means that the higher computing efficiency is expected. Moreover, any shaped polygonal elements can be constructed in a unified form with the same fundamental solution kernels, including convex and non-convex polygonal elements, to provide greater flexibility in meshing effort for complex geometries. Besides, the element boundary integrals endow the method higher versatility with a non-conforming mesh in the pre-processing stage of the analysis over the traditional FEM. No modification to the HFS-FEM formulation is needed for the non-conforming mesh and the element containing hanging nodes is treated normally as the one with more nodes. Finally, the accuracy, convergence, computing efficiency, stability of non-convex element, and straightforward treatment of non-conforming discretization are discussed for the present n-sided polygonal hybrid finite elements by a few applications in the context of anisotropic heat conduction.

Słowa kluczowe

EN

hybrid finite element; polygon; non-conforming mesh; fundamental solution; anisotropic material; heat conduction

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2020
• Tom: Vol. 72, nr 2
• Strony: 109--137
• Opis fizyczny: Bibliogr. 42 poz., rys. kolor.

Twórcy

autor

Cao R. F.

• School of Traffic Engineering, Huanghe Jiaotong University, Jiaozuo, China, 454950

autor

Zhao X. J.

• Henan Province Engineering Laboratory for High Temperature and Wear Materials, School of Material Science & Engineering, Henan University of Technology, Zhengzhou, China, 450001

autor

Lin W. Q.

• College of Civil Engineering, Henan University of Technology, Zhengzhou, China, 450001

autor

Wang H.

• College of Civil Engineering, Henan University of Technology, Zhengzhou, China, 450001

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).