A novel data-driven nonlinear reduced-order modeling framework is proposed for unsteady fluid–structure interactions (FSIs). In the proposed framework, a convolutional variational autoencoder model is developed to determine the coordinate transformation from a high-dimensional physical field into a reduced space. This enables the efficient extraction of nonlinear low-dimensional manifolds from the high-dimensional unsteady flow field of the FSIs. The sparse identification of a nonlinear dynamics (SINDy) algorithm is then used to identify the dynamical governing equations of the reduced space and the vibration responses. To investigate and validate the effectiveness of the proposed framework for modeling and predicting unsteady flow fields in FSI problems, the two-dimensional laminar vortex shedding of a fixed cylinder is considered. Furthermore, the proposed data-driven nonlinear reduced-order modeling framework is applied to the three-dimensional vortex-induced vibration of a flexible cylinder. Using the SINDy model to analyze the vibration responses, the dynamics of the flexible cylinder are found to be correlated with the flow wake patterns, revealing the underlying FSI mechanism. The present work is a significant step toward the establishment of machine learning-based nonlinear reduced-order models for complex flow phenomena, the discovery of underlying unsteady FSI physics, and real-time flow control.
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Research Article|
May 17 2022
Data-driven nonlinear reduced-order modeling of unsteady fluid–structure interactions
Special Collection:
Artificial Intelligence in Fluid Mechanics
Xinshuai Zhang (张鑫帅)
;
Xinshuai Zhang (张鑫帅)
Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University
, Zhejiang 310027, China
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Tingwei Ji (季廷炜);
Tingwei Ji (季廷炜)
Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University
, Zhejiang 310027, China
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Fangfang Xie (谢芳芳)
;
Fangfang Xie (谢芳芳)
a)
Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University
, Zhejiang 310027, China
a)Author to whom correspondence should be addressed: fangfang_xie@zju.edu.cn
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Changdong Zheng (郑畅东);
Changdong Zheng (郑畅东)
Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University
, Zhejiang 310027, China
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Yao Zheng (郑耀)
Yao Zheng (郑耀)
Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University
, Zhejiang 310027, China
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a)Author to whom correspondence should be addressed: fangfang_xie@zju.edu.cn
Note: This paper is part of the special topic, Artificial Intelligence in Fluid Mechanics.
Physics of Fluids 34, 053608 (2022)
Article history
Received:
March 06 2022
Accepted:
April 25 2022
Citation
Xinshuai Zhang, Tingwei Ji, Fangfang Xie, Changdong Zheng, Yao Zheng; Data-driven nonlinear reduced-order modeling of unsteady fluid–structure interactions. Physics of Fluids 1 May 2022; 34 (5): 053608. https://doi.org/10.1063/5.0090394
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