Accurately capturing boundaries is crucial for simulating fluid–structure interaction (FSI) problems involving flexible objects undergoing large deformations. This paper presents a coupling of the immersed boundary-lattice Boltzmann method with a node-based partly smoothed point interpolation method (NPS-PIM) to enhance the accuracy of simulating moving flexible bodies in FSI problems. The proposed method integrates a multiple relaxation time scheme and employs a force correction technique to address boundary capturing inaccuracies. The effect of virtual fluid is accounted for through a Lagrangian point approximation, ensuring precise FSI force calculations for unsteady solid motions. NPS-PIM is utilized as the solid solver, constructing a moderately softened model stiffness by combining the finite element method (FEM) with the node-based smoothed PIM (NS-PIM). Simulations of flow fields near flexible objects with large deformations demonstrate that the proposed approach reduces numerical errors, improves computational efficiency compared to traditional FSI models using FEM and NS-PIM, and accurately captures the behavior of moving flexible bodies and detailed flow fields.
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November 2024
Research Article|
November 11 2024
Accurate simulations of moving flexible objects with an improved immersed boundary-lattice Boltzmann method
Special Collection:
Fluid-Structure Interaction
Shuangqiang Wang (王双强)
;
Shuangqiang Wang (王双强)
(Conceptualization, Data curation, Funding acquisition, Methodology, Writing – original draft)
1
School of Marine Science and Technology, Northwestern Polytechnical University
, Xi'an 710072, China
2
Key Laboratory of Unmanned Underwater Vehicle Technology of Ministry of Industry and Information Technology, Northwestern Polytechnical University
, Xi'an 710072, China
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Haoran Yan (燕浩然)
;
Haoran Yan (燕浩然)
(Conceptualization, Methodology, Writing – review & editing)
3
MOE Key Laboratory of Marine Environment and Ecology, Ocean University of China
, Qingdao 266100, China
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Yunan Cai (蔡堉楠);
Yunan Cai (蔡堉楠)
(Methodology, Writing – review & editing)
4
Department of Discipline Engineering, AECC Commercial Aircraft Engine Co., Ltd
., Shanghai 200241, China
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Guang Pan (潘光);
Guang Pan (潘光)
(Resources, Supervision)
1
School of Marine Science and Technology, Northwestern Polytechnical University
, Xi'an 710072, China
2
Key Laboratory of Unmanned Underwater Vehicle Technology of Ministry of Industry and Information Technology, Northwestern Polytechnical University
, Xi'an 710072, China
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Guiyong Zhang (张桂勇)
;
Guiyong Zhang (张桂勇)
(Methodology, Writing – review & editing)
5
State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, School of Naval Architecture Engineering, Dalian University of Technology
, Dalian 116024, China
6
Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration
, Shanghai 200240, China
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Dong Song (宋东)
Dong Song (宋东)
a)
(Funding acquisition, Writing – review & editing)
1
School of Marine Science and Technology, Northwestern Polytechnical University
, Xi'an 710072, China
a)Author to whom correspondence should be addressed: songdong1226@nwpu.edu.cn
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a)Author to whom correspondence should be addressed: songdong1226@nwpu.edu.cn
Physics of Fluids 36, 113610 (2024)
Article history
Received:
August 23 2024
Accepted:
October 22 2024
Citation
Shuangqiang Wang, Haoran Yan, Yunan Cai, Guang Pan, Guiyong Zhang, Dong Song; Accurate simulations of moving flexible objects with an improved immersed boundary-lattice Boltzmann method. Physics of Fluids 1 November 2024; 36 (11): 113610. https://doi.org/10.1063/5.0234848
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