Mathematical foundations of the immersed finite element method |
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Authors: | Wing Kam Liu Do Wan Kim Shaoqiang Tang |
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Affiliation: | (1) Department of Mechanical Engineering, The Technological Institute Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3111, USA;(2) Department of Mathematics, Sunmoon University, Asan-si, Chungnam, 336-708, Republic of Korea;(3) LTCS, Department of Mechanics and Engineering Science, Peking University, Beijing, 100871, China |
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Abstract: | In this paper, we propose an immersed solid system (ISS) method to efficiently treat the fluid–structure interaction (FSI) problems. Augmenting a fluid in the moving solid domain, we introduce a volumetric force to obtain the correct dynamics for both the fluid and the structure. We further define an Euler–Lagrange mapping to describe the motion of the immersed solid. A weak formulation (WF) is then constructed and shown to be equivalent to both the FSI and the ISS under certain regularity assumptions. The weak formulation (WF) may be computed numerically by an implicit algorithm with the finite element method, and the streamline upwind/Petrov–Galerkin method. Compared with the successful immersed boundary method (IBM) by Peskin and co-workers (J Comput Phys 160:705–719, 2000; Acta Numerica 11:479–517, 2002; SIAM J Sci Stat Comput 13(6):1361–1376, 1992) the ISS method applies to more general geometries with non-uniform grids and avoids the inaccuracy in approximating the Dirac delta function |
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Keywords: | Fluid-Structure interaction Euler-Lagrange mapping Immersed finite element method |
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