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Strongly coupled fluid-structure interaction analysis of aquatic flapping wings based on flexible multibody dynamics and the modified unsteady vortex lattice method

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OCEAN ENGINEERING 2023年 281卷

作者： Luo, Ming Wu, Zhigang Yang, Chao Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China

Because of their superior efficiency and low detectability compared to conventional submarine-shaped vehicles, bionic underwater vehicles such as Mantabot are playing increasingly important roles in ocean exploration. However, current research on manta-inspired robots is limited to structural design and pure hydrodynamics analysis of pectoral fin performance, with other aspects such as hydroelasticity and optimal design of flapping wings rarely addressed. This work presents a novel method for analyzing aquatic flapping wings by coupling flexible multibody dynamics with a modified unsteady vortex lattice method. The flexible multibody system is solved by using the absolute nodal coordinate formulation, and the conventional unsteady vortex lattice method is modified to accommodate dynamic stall. Compactly supported radial basis functions are used to transfer the hydroelastic forces and structural displacements across the interface meshes while satisfying global energy conservation, and a predictor-corrector method is used to stabilize the iteration procedure. Three different experiments are used to validate the flexible multibody dynamics solver, the modified unsteady vortex lattice solver, and the proposed fluid-structure interaction framework, respectively. Finally, the hydroelastic framework is demonstrated for a fin-like wing, and how flexibility and movement affect the flapping wing dynamics is examined. Numerical examples show that reducing the structural stiffness of the aquatic flapping wing within a certain range improves the propulsive efficiency but also reduces the thrust coefficient, and how the stiffness distribution affects the thrust and propulsive efficiency remains consistent over a range of the Strouhal number.

关键词： fluid-structure interaction Manta ray robot Flexibility Strouhal number

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Numerical investigation of drag reduction characteristics of flexible plate based on two way fluid-structure interaction

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OCEAN ENGINEERING 2023年 271卷

作者： Li, Yongcheng Zhang, Hua Zhang, Nan Lia, Yinghua Pan, Ziying Sun, Hailang China Ship Sci Res Ctr Sci Res Dept Hydrodynam Wuxi 214082 Peoples R China Taihu Lab Deepsea Technol Sci Wuxi 214082 Peoples R China

To investigate the drag reduction characteristics of a flexible plate, a numerical simulation analysis was per-formed on the relationships of flexibility and thickness of a flexible plate on the effect of drag reduction. To accurately demonstrate the mutual interaction between flexible and fluid flows and capture the moving boundary of the plate, a bidirectional fluid-structure interaction (FSI) method was developed. The numerical results demonstrated that the flexible plate played a positive role in drag reduction. The drag reduction effect could be improved by increasing the flexibility of the plate or decreasing its thickness. Moreover, the pressure-difference resistance acting on the flexible plate was negative, indicating that the existence of pressure resistance was favorable for drag reduction. Further, the numerical results revealed that the real contribution to the drag reduction lay at the middle part of the flexible plate, i.e., the part with the significant deformation, whereas the parts with small deformation exerted little effect on the drag reduction. The conclusions from this study can provide guidance for future investigation of FSI problem and flexible surface-drag-reduction technology.

关键词： Flexible plate Drag reduction fluid-structure interaction Numerical investigation

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Linear stability analysis of fluid-structure interaction problems with an immersed boundary method

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JOURNAL OF fluidS AND structureS 2023年 117卷

作者： Tirri, Antonia Nitti, Alessandro Sierra-Ausin, Javier Giannetti, Flavio de Tullio, Marco D. Polytech Univ Bari Dept Mech Math & Management Via Re David 200 I-70125 Bari Italy Univ Salerno Dept Ind Engn Via Giovanni Paolo 2132 I-84084 Fisciano Italy Inst Mecan Fluides Toulouse IMFT 2 Allee Pr Camille Soula F-31400 Toulouse France

In this work, we present a novel approach to perform the linear stability analysis of fluid-structure interaction problems. The underlying idea is the combination of a validated immersed boundary solver for the nonlinear coupled dynamics with Krylovbased techniques to obtain a robust and accurate global stability solver for elastic structures interacting with incompressible viscous flows. The computation of the leading eigenvalues of the linearized system is carried out in a matrix-free framework by adopting a classical Krylov subspace method. The proposed algorithm avoids the complex analytical linearization of the equations while retaining all the relevant aspects of the fully-coupled fluid-structure system. The methodology has been tested for several cases involving two-dimensional incompressible flows around elastically mounted circular cylinders. The obtained results show a good quantitative agreement with those available in the literature. Finally, the method was applied to investigate the linear stability of the laminar flow past two elastically mounted cylinders in tandem configuration at Re = 100, revealing the existence of two complex dominant modes. For low values of the reduced velocity U*, only one mode is found to be unstable and related to the stationary wake mode. The loss of stability of the second mode at U* = 4 marks the beginning of the lock-in region. We also show that for U* = 5 the modes interact, giving rise to the beating phenomenon observable in the nonlinear time evolution of the system. For larger values of the reduced velocity, the linear dynamics is governed by one dominant mode characterized by wider oscillations of the rear cylinder, matching the results of the nonlinear simulations.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： Linear stability analysis Immersed-boundary method fluid-structure interaction Jacobian-free methods

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Porcine and bovine aortic valve comparison for surgical optimization: A fluid-structure interaction modeling study

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INTERNATIONAL JOURNAL OF CARDIOLOGY 2021年 334卷 88-95页

作者： Li, Caili Tang, Dalin Yao, Jing Shao, Yongfeng Sun, Haoliang Hammer, Peter Gong, Chanjuan Ma, Luyao Zhang, Yanjuan Wang, Liang Yu, Han Yang, Chun Baird, Christopher Southeast Univ Sch Math Nanjing Peoples R China Southeast Univ Sch Biol Sci & Med Engn Nanjing Peoples R China Worcester Polytech Inst Dept Math Sci Worcester MA 01609 USA Nanjing Med Univ Affiliated Hosp 1 Dept Cardiol Nanjing Peoples R China Nanjing Med Univ Affiliated Hosp 1 Dept Cardiovasc Surg Nanjing Peoples R China Harvard Med Sch Boston Childrens Hosp Dept Cardiac Surg Boston MA 02115 USA Nanjing Med Univ Affiliated Hosp 1 Dept Anesthesiol Nanjing Peoples R China China Informat Tech Designing & Consulting Inst C Beijing Peoples R China Southeast Univ Nanjing Peoples R China

Background: Porcine aortic valve (PAV) and bovine aortic valve (BAV) are commonly used in aortic valve replacement (AVR) surgeries. A detailed comparison for their hemodynamic and structural stress/strain performances would help to better understand valve cardiac function and select valve type and size for AVR outcome optimizations. Methods: Eight fluid-structure interaction models were constructed to compare hemodynamic and stress/strain behaviors of PAV and BAV with 4 sizes (19, 21, 23, and 25 mm). Blood flow velocity, systolic cross-valve pressure gradient (SCVPG), geometric orifice area (GOA), flow shear stresses (FSS), and stress/strain were obtained for comparison. Results: Compared with PAV, BAV has better hemodynamic performance, with lower maximum flow velocity (7.17%) and pressure (9.82%), smaller pressure gradient (mean and peak SCVPG: 8.92% and 9.28%), larger GOA (9.56%) and lower FSS (6.61%). The averages of the mean and peak net pressure gradient values from 4 BAV models were 8.10% and 8.35% lower than that from PAV models. Larger valve sizes for both PAV and BAV had improved hemodynamic performance. Maximum flow velocity, pressure, mean SCVPG and maximum FSS from 25 mm BAV were 36.80%, 15.81%, 39.05% and 38.83% lower than those from 19 mm BAV. The GOA of PAV and BAV 25 mm Valve were 43.75% and 33.07% larger than 19 mm valves, respectively. BAV has lower stress on the leaflets than PAV. Conclusions: BAV had better hemodynamic performance and lower leaflets stress than PAV. More patient studies are needed to validate our findings. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// ***/licenses/by/4.0/).

关键词： Aortic valve replacement fluid-structure interaction Porcine aortic valve Bovine aortic valve

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Numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation

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THEORETICAL BIOLOGY AND MEDICAL MODELLING 2021年第1期18卷 1-10页

作者： He, Fan Hua, Lu Guo, Tingting Beijing Univ Civil Engn & Architecture Sch Sci Dept Mech Beijing 100044 Peoples R China Chinese Acad Med Sci State Key Lab Cardiovascu Dis Thrombosis CtrNatl Ctr Cardiovasc Dis Natl Clin Res Ctr Cardiovasc DisFuwai Hosp Beijing 100037 Peoples R China Peking Union Med Coll Beijing 100037 Peoples R China

Background The effects of arterial wall compliance on blood flow have been revealed using fluid-structure interaction in last decades. However, microcirculation is not considered in previous researches. In fact, microcirculation plays a key role in regulating blood flow. Therefore, it is very necessary to involve microcirculation in arterial hemodynamics. Objective The main purpose of the present study is to investigate how wall compliance affects the flow characteristics and to establish the comparisons of these flow variables with rigid wall when microcirculation is considered. Methods We present numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation. A novel outlet boundary condition is employed to prescribe microcirculation in an idealised model. Results The novel finding in this work is that wall compliance under the consideration of microcirculation leads to the increase of wall shear stress in contrast to rigid wall, contrary to the traditional result that wall compliance makes wall shear stress decrease when a constant or time dependent pressure is specified at an outlet. Conclusions This work provides the valuable study of hemodynamics under physiological and realistic boundary conditions and proves that wall compliance may have a positive impact on wall shear stress based on this model. This methodology in this paper could be used in real model simulations.

关键词： fluid-structure interaction Microcirculation Hemodynamics Outlet boundary condition Numerical modeling

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Modeling of soft fluidic actuators using fluid-structure interaction simulations with underwater applications

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INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2023年 255卷

作者： Xavier, Matheus S. Harrison, Simon M. Howard, David Yong, Yuen K. Fleming, Andrew J. Univ Melbourne Dept Elect & Elect Engn Parkville Vic 3010 Australia Data61 CSIRO Clayton Vic 3168 Australia Data61 CSIRO Pullenvale Qld 4069 Australia Univ Newcastle Sch Engn Precis Mechatron Lab Callaghan NSW 2308 Australia

Soft robots have been developed for a variety of applications including gripping, locomotion, wearables and medical devices. For the majority of soft robots, actuation is performed using pneumatics or hydraulics. Many previous works have addressed the modeling of these fluid-driven soft robots using static finite element simulations where the pressure inside the actuator is assumed to be constant and uniform. The assumption of constant internal pressure is a useful simplification but introduces significant errors during events such as pressurization, depressurization, and transient loads from a liquid environment. Applications that use soft actuators for locomotion or propulsion operate using a sequence of transient events, so accurate simulation of these events is critical to optimizing performance. To improve the simulation of soft fluidic actuators and enable the modeling of both internal and external fluid flow in underwater applications, this work describes a fully-coupled, three-dimensional fluid-structure interaction simulation approach, where the pressure and flow dynamics are explicitly solved. This approach provides a realistic simulation of soft actuators in fluid environments, and permits the optimization of transient responses, which may be due to a combination of environmental fluid loads and non-uniform pressurization. The proposed methods are demonstrated in a number of case studies and experiments for a range of actuation and both internal and external inlet flow configurations, including bending actuators, a soft robotic fish fin for propulsion, and experimental results of a bending actuator in a high-speed fluid, which correlate closely with simulations. The proposed approach is expected to assist in the design, modeling, and optimization of bioinspired soft robots in underwater applications.

关键词： Soft robotics Soft actuators fluid-structure interaction Finite element modeling Underwater robots

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Effect of aortic bifurcation geometry on pressure and peak wall stress in abdominal aorta: fluid-structure interaction study

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MEDICAL ENGINEERING & PHYSICS 2023年 118卷 104014-104014页

作者： Jagos, Jiri Schwarz, David Polzer, Stanislav Bursa, Jiri Brno Univ Technol Fac Mech Engn Tech 2896-2 Brno 61669 Czech Republic VSB Tech Univ Ostrava Dept Appl Mech 17 listopadu 2172-15 Ostrava 70800 Czech Republic

Background and Objective: Geometry of aorto-iliac bifurcation may affect pressure and wall stress in aorta and thus potentially serve as a predictor of abdominal aortic aneurysm (AAA), similarly to ***: Effect of aorto-iliac bifurcation geometry was investigated via parametric analysis based on two-way weakly coupled fluid-structure interaction simulations. The arterial wall was modelled as isotropic hyperelastic monolayer, and non-Newtonian behaviour was introduced for the fluid. Realistic boundary conditions of the pulsatile blood flow were used on the basis of experiments in literature and their time shift was tailored to the pulse wave velocity in the model to obtain physiological wave shapes. Eighteen idealized and one patient-specific geometries of human aortic tree with common iliac and renal arteries were considered with different angles between abdominal aorta (AA) and both iliac arteries and different area ratios (AR) of iliac and aortic luminal cross ***: Peak wall stress (PWS) and systolic blood pressure (SBP) were insensitive to the aorto-iliac angles but sensitive to the AR: when AR decreased by 50%, the PWS and SBP increased by up to 18.4% and 18.8%, ***: Lower AR (as a result of the iliac stenosis or aging), rather than the aorto-iliac angles increases the BP in the AA and may be thus a risk factor for the AAA development.

关键词： Aortic bifurcation fluid-structure interaction Abdominal aortic aneurysm Atherosclerosis Aorto-iliac ratio Aorto-iliac angles

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Vibration Characteristic Analysis of Hollow Fiber Membrane for Air Dehumidification Using fluid-structure interaction

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MEMBRANES 2023年第2期13卷 233-233页

作者： Liang, Caihang Chen, Jiaxing Li, Nanfeng Dong, Yanfang Zhong, Tao Zeng, Si Dong, Chuanshuai Guilin Univ Elect Technol Sch Mech & Elect Engn Guangxi Dept Educ Key Lab Microelect Packaging & Assembly Technol Guilin 541004 Peoples R China Dongguan Univ Technol Guangdong Prov Key Lab Distributed Energy Syst Dongguan 523808 Peoples R China Guilin Univ Aerosp Technol Sch Energy & Built Environm Guilin 541004 Peoples R China Nanning Coll Vocat Technol Dept Sci & Technol Nanning 530008 Peoples R China Guangxi Beitou Environm Protect & Water Grp Co Ltd Nanning 530025 Peoples R China South China Univ Technol Sch Chem & Chem Engn Key Lab Enhanced Heat Transfer & Energy Conservat Educ Minist Guangzhou 510641 Peoples R China

Hollow fiber membrane dehumidification is an effective and economical method of air dehumidification. The hollow fiber membrane module is the critical component of the dehumidification system, which is formed by an arrangement of several hollow fiber membranes. The air stream crosses over the fiber bundles when air dehumidification is performed. The fibers vibrate with the airflow. To investigate the characteristics of the fluid-induced vibration of the hollow fiber membrane, the two-way fluid-structure interaction model under the air-induced condition was established and verified by experiments. The effect of length and air velocity on the vibration and modal of a single hollow fiber membrane was studied, as well as the flow characteristics using the numerical simulation method. The results indicated that the hollow fiber membrane was mainly vibrated by fluid impact in the direction of the airflow. When the air velocity was 1.5 m/s similar to 6 m/s and the membrane length was 100 similar to 400 mm, the natural frequency of the membrane was negatively correlated with length and positively correlated with air velocity. Natural frequencies were more sensitive to changes in length than changes in air velocity. The maximum equivalent stress and total deformation increased with air velocity and length. The maximum equivalent stress was concentrated at both ends, and the maximum deformation occurred in the middle. The research results provided a basis for the structural design of hollow fiber membranes under flow-induced vibration conditions.

关键词： hollow fiber membrane fluid-structure interaction modal vibration

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The fluid-structure interaction lubrication performances of a novel bearing: Experimental and numerical study

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TRIBOLOGY INTERNATIONAL 2023年 179卷

作者： Xie, Zhongliang Jiao, Jian Wrona, Stanislaw Northwestern Polytech Univ Dept Engn Mech Xian 710072 Peoples R China Northwestern Polytech Univ Shenzhen Res & Dev Inst Shenzhen 518057 Peoples R China Xidian Univ Sch Mech Elect Engn Xian 710071 Peoples R China Silesian Tech Univ Dept Measurements & Control Syst Gliwice Poland Northwestern Polytech Univ Dept Engn Mech Xian 710072 Peoples R China

This paper proposes a novel double-liner bearing in order to overcome the disadvantages of traditional water -lubricated single-liner bearings. It is expected to achieve a new breakthrough in the performances of high -load, low-resistance, vibration-attenuation and noise-reduction. The fluid-structure interaction dynamic model of sandwich liner bearing is established. Turbulent effect is taken into account. The influences of eccentricity ratios and liner thickness on the lubrication performance are studied. The evolution mechanisms of liner thickness on lubrication performances are revealed. The results show that there are superior lubrication be-haviors in sandwich liner bearing. The present study enriches the theoretical systems of the lubrication. It provides new ideas and ways for the design and R&D of the bearing, which is of great significance.

关键词： Water-lubricated bearing fluid-structure interaction Nonlinear dynamic behaviors Sandwich-liner

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A memory-efficient MultiVector Quasi-Newton method for black-box fluid-structure interaction coupling

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COMPUTERS & structureS 2023年 275卷

作者： Zorrilla, R. Rossi, R. Univ Politecn Catalunya UPC Dept Engn Civil & Ambiental DECA Jordi Girona 1 Barcelona 08034 Spain Int Ctr Numer Methods Engn CIMNE Gran Capita s-n Barcelona 08034 Spain

In this work we present a novel Quasi-Newton technique for the black-box partitioned coupling of inter-face coupled problems. The new RandomiZed Multi-Vector Quasi-Newton method stems from the com-bination of the original Multi-Vector Quasi-Newton technique with the randomized Singular Value Decomposition algorithm, avoiding thus any dense DOFs-sized square matrix operation. This results in a reduction from quadratic to linear complexity in terms of the number of DOFs. Besides this, the need of storing the old inverse Jacobian is also avoided. Instead, only two very "thin" matrices are required to be saved, thus implying a much smaller memory footprint. Furthermore, our proposal can be used free of any user-defined parameter. The article describes the application of the method to the FSI interface residual equations in both Interface Quasi-Newton and Interface Block Quasi-Newton forms. For the lat-ter, we also derive a closed form expression for the update, thus avoiding any linear system of equations resolution, by applying the Woodbury matrix identity to the inverse Jacobian decomposition matrices.

关键词： fluid-structure interaction Quasi -Newton methods Black-box coupling Randomized Singular Value Decomposition

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