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fluid-structure interaction of bio-inspired flexible slender structures: a review of selected topics

BIOINSPIRATION & BIOMIMETICS 2022年第4期17卷 041002-041002页

作者： Wang, Chenglei Tang, Hui Zhang, Xing Hong Kong Polytech Univ Res Ctr Fluid Struct Interact Dept Mech Engn Kowloon Hong Kong Peoples R China Hong Kong Polytech Univ Shenzhen Res Inst Shenzhen 518057 Guangdong Peoples R China Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech LNM Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China

Flexible slender structures are ubiquitous in biological systems and engineering applications. fluid-structure interaction (FSI) plays a key role in the dynamics of such structures immersed in fluids. Here, we survey recent studies on highly simplified bio-inspired models (either mathematical or mechanical) that aim to revealthe flow physics associated with FSI. Various models from different sources of biological inspiration are included, namely flexible flapping foil inspired by fish and insects, deformable membrane inspired by jellyfish and cephalopods, beating filaments inspired by flagella and cilia of microorganisms, and flexible wall-mounted filaments inspired by terrestrial and aquatic plants. Suggestions on directions for future research are also provided.

关键词： fluid-structure interaction flexibility flapping foil jellyfish swimming ciliary propulsion plant motion in fluid energy harvesting

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fluid-structure interaction Model for Predicting Surgical Result of Total Anomalous Pulmonary Venous Connection and Estimating Pulmonary Venous Properties

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CARDIOVASCULAR ENGINEERING AND TECHNOLOGY 2022年第5期13卷 725-734页

作者： Jin, Jie Ma, Xiaohui Fu, Xingpeng Zhang, Zewei Yu, Jiangen Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept Cardiac SurgSch Med Hangzhou Peoples R China Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept RadiolSch Med Hangzhou Peoples R China Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept UltrasonogSch Med Hangzhou Peoples R China

Objectives To build a fluid-structure interaction model of pulmonary veins with total anomalous pulmonary venous connection, which can be used to predict the result of surgical treatment and at the same time to estimate the elastic properties of pulmonary veins based on patient-specific data and clinic postoperative results. Methods The fluid-structure interaction (FSI) model was used to simulate the anastomosis on pulmonary veins based on computed tomography angiography data collected from three children with total anomalous pulmonary venous connection (TAPVC), supra-cardiac type. The deformation and the stress of anastomosis, and also the velocity of blood flow were calculated in fluid-structure coupling algorithm. During the simulation the variable boundary conditions were applied, including the thickness of vessel wall and the vessel elasticity for which was selected a range of values. The calculation results were finally compared to postoperative results of same patients and discussed. The corresponding outcomes are given in the conclusions section. Results The blood flow velocity through the outlet will vary depending on the properties of vessels, including physical properties and thickness of vessel wall. The stress on vessel is lower for smaller values of Young's modulus. The calculated blood flow velocity correlates well with the postoperative results for the Young's modulus of vessels ranging from 0.5 to 1.0 MPa. Conclusions The FSI model has high potential to predict the result of surgery for TAPVC and to estimate the physical properties of pulmonary vein. This model also has potential to guide the strategy for surgical treatment.

关键词： fluid-structure interaction TAPVC Pulmonary vein Anastomosis Young's modulus

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fluid-structure interaction modeling with nonmatching interface discretizations for compressible flow problems: Computational framework and validation study

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MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES 2022年第12期32卷 2497-2528页

作者： Rajanna, Manoj R. Johnson, Emily L. Liu, Ning Korobenko, Artem Bazilevs, Yuri Hsu, Ming-Chen Iowa State Univ Dept Mech Engn Ames IA 50011 USA Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA Global Engn & Mat Inc Princeton NJ 08540 USA Univ Calgary Dept Mech & Mfg Engn Calgary AB T2N 1N4 Canada Brown Univ Sch Engn Providence RI 02912 USA Iowa State Univ Dept Mech Engn Ames IA 50011 USA

This work presents a strongly-coupled fluid-structure interaction (FSI) formulation for compressible flows that is developed based on an augmented Lagrangian approach. The method is suitable for handling problems that involve nonmatching fluid-structure interface discretizations. In this work, the fluid is modeled using a stabilized finite element method for the Navier-Stokes equations of compressible flows and is coupled to the structure, which is formulated using isogeometric Kirchhoff-Love shells. The strongly-coupled system is solved using a block-iterative approach. The proposed method is validated using two compressible flow benchmark problems to assess the accuracy of the developed formulation.

关键词： Compressible flow fluid-structure interaction nonmatching interface isogeometric analysis Kirchhoff-Love shell

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fluid-structure interaction analysis of heat exchanger with torsional flow in the shell side

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2022年第1期36卷 479-489页

作者： Gu, Xin Wang, Guan Zhang, Qianxin Chen, Cheng Li, Ning Chen, Weijie Zhengzhou Univ Key Lab Proc Heat Transfer & Energy Saving Henan Zhengzhou 450002 Peoples R China

Based on the theory of fluid-structure interaction (FSI), the flow characteristics and mechanical properties of torsional flow heat exchanger (TFHX) and cross torsional flow heat exchanger (CTFHX) were numerically studied. The simulation results were compared with the experimental results to verify the reliability of the numerical simulation. The results show that the pressure drop of CTFHX decrease is 30.31-32.56 % lower than that of TFHX, and the heat transfer coefficient is found to lower by 16.8-18.5 %, but the comprehensive performance h/Delta P is increased by 14.8-17.9 %. There is also a higher stress around the baffle holes, and the influence of temperature load on stress is much greater than that of pressure load. Moreover, the linearization results of hazardous locations show that CTFHX has greater stress. This study provides theoretical guidance for the structural optimization and equipment maintenance of heat exchanger.

关键词： fluid-structure interaction Stress analysis Thermal hydraulic performance Torsional flow

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fluid-structure interaction simulation of calcified aortic valve stenosis

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MATHEMATICAL BIOSCIENCES AND ENGINEERING 2022年第12期19卷 13172-13192页

作者： Cai, Li Hao, Yu Ma, Pengfei Zhu, Guangyu Luo, Xiaoyu Gao, Hao Northwestern Polytech Univ Sch Math & Stat Xian 710129 Peoples R China NPU UoG Int Cooperat Lab Computat & Applicat Card Xian 710129 Peoples R China Xian Key Lab Sci Computat & Appl Stat Xian 710129 Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Peoples R China Univ Glasgow Sch Math & Stat Glasgow G12 8QQ Lanark Scotland

Calcified aortic valve stenosis (CAVS) is caused by calcium buildup and tissue thickening that impede the blood flow from left ventricle (IN) to aorta. In recent years, CAVS has become one of the most common cardiovascular diseases. Therefore, it is necessary to study the mechanics of aortic valve (AV) caused by calcification. In this paper, based on a previous idealized AV model, the hybrid immersed boundary/finite element method (IB/FE) is used to study AV dynamics and hemodynamic performance under normal and calcified conditions. The computational CAVS model is realized by dividing the AV leaflets into a calcified region and a healthy region, and each is described by a specific constitutive equation. Our results show that calcification can significantly affect 1W dynamics. For example, the elasticity and mobility of the leaflets decrease due to calcification, leading to a smaller opening area with a high forward jet flow across the valve. The calcified valve also experiences an increase in local stress and strain. The increased loading due to AV stenosis further leads to a significant increase in left ventricular energy loss and transvalvular pressure gradients. The model predicted hemodynamic parameters are in general consistent with the risk classification of AV stenosis in the clinic. Therefore, mathematical models of AV with calcification have the potential to deepen our understanding of AV stenosis-induced ventricular dysfunction and facilitate the development of computational engineering-assisted medical diagnosis in AV related diseases.

关键词： fluid-structure interaction aortic valve calcification hybrid immersed boundary/finite element method

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fluid-structure interaction analysis of eccentricity and leaflet rigidity on thrombosis biomarkers in bioprosthetic aortic valve replacements

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2022年第12期38卷 e3649页

作者： Oks, David Samaniego, Cristobal Houzeaux, Guillaume Butakoff, Constantine Vazquez, Mariano Barcelona Supercomp Ctr BSC Dept Comp Applicat Sci & Engn Placa Eusebi Guell 1-3 Barcelona 08034 Spain ELEM Biotech SL Barcelona Spain

This work intends to study the effect of aortic annulus eccentricity and leaflet rigidity on the performance, thrombogenic risk and calcification risk in bioprosthetic aortic valve replacements (BAVRs). To address these questions, a two-way immersed fluid-structure interaction (FSI) computational model was implemented in a high-performance computing (HPC) multi-physics simulation software, and validated against a well-known FSI benchmark. The aortic valve bioprosthesis model is qualitatively contrasted against experimental data, showing good agreement in closed and open states. Regarding the performance of BAVRs, the model predicts that increasing eccentricities yield lower geometric orifice areas (GOAs) and higher normalized transvalvular pressure gradients (TPGs) for healthy cardiac outputs during systole, agreeing with in vitro experiments. Regions with peak values of residence time are observed to grow with eccentricity in the sinus of Valsalva, indicating an elevated risk of thrombus formation for eccentric configurations. In addition, the computational model is used to analyze the effect of varying leaflet rigidity on both performance, thrombogenic and calcification risks with applications to tissue-engineered prostheses. For more rigid leaflets it predicts an increase in systolic and diastolic TPGs, and decrease in systolic GOA, which translates to decreased valve performance. The peak shear rate and residence time regions increase with leaflet rigidity, but their volume-averaged values were not significantly affected. Peak solid stresses are also analyzed, and observed to increase with rigidity, elevating risk of valve calcification and structural failure. To the authors' knowledge this is the first computational FSI model to study the effect of eccentricity or leaflet rigidity on thrombogenic biomarkers, providing a novel tool to aid device manufacturers and clinical practitioners.

关键词： aortic valve replacement computational biomechanics fluid-structure interaction high performance computing thrombosis

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fluid-structure interaction analysis of flexible flapping wing in the Martian environment

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ACTA ASTRONAUTICA 2022年 193卷 138-151页

作者： Kawakami, Kosuke Kaneko, Shigeki Hong, Giwon Miyamoto, Hideaki Yoshimura, Shinobu Univ Tokyo Sch Engn Dept Syst Innovat Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan Japan Aerosp Explorat Agcy 2-1-1 Sengen Tsukuba Ibaraki 3058505 Japan

Flapping-wing micro air vehicle (FWMAV) is an attractive idea for Mars exploration because of its high capability in a thin atmosphere. The biggest challenge for its development is an appropriate understanding of a flapping flight with flexible wings, which is significantly complicated because flexible flapping wings can undergo large-scale deformations due to the effects of wing inertia and the aerodynamic forces exerted by the surrounding atmosphere. fluid-structure interaction (FSI) analysis is a powerful tool for accurate investigations, but it usually has a very high computational cost, making it challenging to perform necessary parametric studies for practical designing. An efficient FSI analysis method is required. On Mars, whose atmospheric density is around 1% that of Earth, aerodynamic forces have a relatively small influence on wing deformation and may even be negligible in some cases. We thus investigate the relative contributions of the inertial force of a flapping wing and the aerodynamic forces exerted by the surrounding Martian atmosphere using a two-way coupled FSI simulation, and identify the conditions under which the aerodynamic forces are negligible. Then, we develop a computationally efficient one-way coupled FSI analysis system based on the interface-capturing method to design a flexible flapping wing for Mars exploration. Under the obtained conditions, we perform parametric studies on hovering flight with flexible flapping wings in the Martian environment with multiple aerodynamic parameters, various kinematic parameters, and material properties of the wing. We conclude that an FWMAV with a payload of around 5 g can fly for more than 1 min for the maximum density of the Martian atmosphere.

关键词： Flapping wing fluid-structure interaction Two-way coupling One-way coupling Mars

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A parallel solver framework for fully implicit monolithic fluid-structure interaction

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Acta Mechanica Sinica 2025年第2期41卷 88-115页

作者： Yujie Sun Qingshuang Lu Ju Liu Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications Southern University of Science and TechnologyShenzhen 518055China

We propose a suite of strategies for the parallel solution of fully implicit monolithic fluid-structure interaction(FSI).The solver is based on a modeling approach that uses the velocity and pressure as the primitive variables,which offers a bridge between computational fluid dynamics(CFD)and computational structural *** spatiotemporal discretization leverages the variational multiscale formulation and the generalized-αmethod as a means of providing a robust discrete *** particular,the time integration scheme does not suffer from the overshoot phenomenon and optimally dissipates high-frequency spurious modes in both subproblems of *** on the chosen fully implicit scheme,we systematically develop a combined suite of nonlinear and linear solver *** a block factorization of the Jacobian matrix,the Newton-Raphson procedure is reduced to solving two smaller linear systems in the multi-corrector *** first is of the elliptic type,indicating that the algebraic multigrid method serves as a well-suited *** second exhibits a two-by-two block structure that is analogous to the system arising in *** by prior studies,the additive Schwarz domain decomposition method and the block-factorization-based preconditioners are invoked to address the linear *** the number of unknowns matches in both subdomains,it is straightforward to balance loads when parallelizing the algorithm for distributed-memory *** use two representative FSI benchmarks to demonstrate the robustness,efficiency,and scalability of the overall FSI solver *** particular,it is found that the developed FSI solver is comparable to the CFD solver in several aspects,including fixed-size and isogranular scalability as well as robustness.

关键词： fluid-structure interaction Monolithic coupling Implicit time integration Iterative methods Vortex-induced vibration

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fluid-structure interaction VIBRATION CHARACTERISTICS OF FLEXIBLE RISER TRANSPORTING HIGH-SPEED SPIRAL FLOW IN DEEP-SEA MINING 42

FLUID-STRUCTURE INTERACTION VIBRATION CHARACTERISTICS OF FLE...

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ASME 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Zhang, Jiayu Chen, Nian-Zhong Shen, Cong Tianjin Univ Sch Civil Engn Tianjin Peoples R China Tianjin Univ State Key Lab Hydraul Engn Simulat & Safety Tianjin Peoples R China

ISBN: (纸本)9780791886892

According to Hamilton's principle and conservation law of mass and momentum, governing equations of fluid-structure interaction and structural dynamics of a flexible riser transporting high-speed spiral flow are developed for vortex-induced vibration (VIV) analysis for lifting pipe system in deep-sea mining. The bi-directional fluid-solid interaction between flexible riser and internal and external flows is achieved by data mapping and exchange among the flow field domain and the solid domain. where the radial basis function method is used for moving interpolation of the flow field grid boundaries and internal nodes. The governing equations are then discretized and solved by the finite element method. Based on the computational fluid dynamics (CFD) method, a three-dimensional flexible riser fluid-structure coupling numerical model is established, and the numerical accuracy of the model is verified. Furthermore, dynamic characteristics of VIV of the flexible riser transporting spiral flow are investigated and the effects of internal flow velocity of the spiral flow on VIV responses are evaluated. The results show that the variation of modal vibration pattern of the flexible riser under the combined excitation of internal and external flows is evident, and the flow velocity of internal flow have significant nonlinear effects on the inherent frequency and vibration deformation of the flexible riser.

关键词： Spiral flow fluid-structure interaction vortex-induced vibration (VIV) flexible riser deep-sea mining

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A comprehensive numerical study on the current-induced fluid-structure interaction of flexible submerged vegetation

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JOURNAL OF fluidS AND structureS 2025年 133卷

作者： Prueter, Inga Sproeer, Felix Keimer, Kara Lojek, Oliver Windt, Christian Schuerenkamp, David Bihs, Hans Nistor, Ioan Goseberg, Nils Tech Univ Carolo Wilhelmina Braunschweig Leichtweiss Inst Hydraul Engn & Water Resources Div Hydromech Coastal & Ocean Engn Beethovenstr 51A D-38106 Braunschweig Germany Norwegian Univ Sci & Technol Dept Civil & Environm Engn N-7491 Trondheim Norway Univ Ottawa Dept Civil Engn 161 Louis Pasteur Ottawa ON K1N 6N5 Canada Joint Cent Inst Leibniz Univ Hannover & Tech Univ Coastal Res Ctr Merkurstr 11 D-30419 Hannover Germany

Submerged vegetation is becoming more and more relevant as a nature-based solution for coastal protection schemes, counteracting the effects of climate change and sea level rise. The numerical model REEF3D has been used to simulate the motion of and forces exerted on flexible vegetation under unidirectional currents. This study emphasizes the critical need for accurate solutions obtained by numerical models to investigate the complex ecosystem services, adopting a direct forcing approach using the immersed boundary method. The fluid- structure interaction capability within the finite difference model is comprehensively evaluated for the simulation of stem motions and forces exerted on flexible vegetation under varying unidirectional flows. Thresholds for numerical parameters, including a minimum number of 25 rigid elements composing the stem, are identified for accurate solutions. The necessity of using large eddy simulations and a Smagorinsky constant of 0.1 to simulate the turbulent flow is demonstrated. The study confirms the accuracy of the implemented fluid-structure interaction model to replicate stem bending (less than 10 % deviation relative to the stem length) and forces across varying hydrodynamic conditions.

关键词： fluid-structure interaction Flexible vegetation Large eddy simulation REEF3D Nature-based solutions

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