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fluid-structure interaction: Insights into biomechanical implications of endograft after thoracic endovascular aortic repair

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COMPUTERS IN BIOLOGY AND MEDICINE 2021年 138卷 104882-104882页

作者： Qiao, Yonghui Mao, Le Ding, Ying Zhu, Ting Luo, Kun Fan, Jianren Zhejiang Univ State Key Lab Clean Energy Utilizat 38 Zheda Rd Hangzhou 310027 Peoples R China Fudan Univ Zhongshan Hosp Dept Vasc Surg Shanghai Peoples R China Fudan Univ Zhongshan Hosp Dept Radiol Shanghai Peoples R China

Thoracic endovascular aortic repair (TEVAR) has developed to be the most effective treatment for aortic diseases. This study aims to evaluate the biomechanical implications of the implanted endograft after TEVAR. We present a novel image-based, patient-specific, fluid-structure computational framework. The geometries of blood, endograft, and aortic wall were reconstructed based on clinical images. Patient-specific measurement data was collected to determine the parameters of the three-element Windkessel. We designed three postoperative scenarios with rigid wall assumption, blood-wall interaction, blood-endograft-wall interplay, respectively, where a two-way fluid-structure interaction (FSI) method was applied to predict the deformation of the composite stentwall. Computational results were validated with Doppler ultrasound data. Results show that the rigid wall assumption fails to predict the waveforms of blood outflow and energy loss (EL). The complete storage and release process of blood flow energy, which consists of four phases is captured by the FSI method. The endograft implantation would weaken the buffer function of the aorta and reduce mean EL by 19.1%. The closed curve area of wall pressure and aortic volume could indicate the EL caused by the interaction between blood flow and wall deformation, which accounts for 68.8% of the total EL. Both the FSI and endograft have a slight effect on wall shear stress-related-indices. The deformability of the composite stent-wall region is remarkably limited by the endograft. Our results highlight the importance of considering the interaction between blood flow, the implanted endograft, and the aortic wall to acquire physiologically accurate hemodynamics in post-TEVAR computational studies and the deformation of the aortic wall is responsible for the major EL of the blood flow.

关键词： Thoracic endovascular aortic repair Aortic endograft Windkessel model fluid-structure interaction Computational fluid dynamics

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Investigation of whipping effect on high energy pipe based on fluid-structure interaction method

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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2023年 173卷

作者： Hu, Jincheng Wang, Xiaochuan Li, Yueqin Wen, Xiaoting Wu, Yizheng Huang, Yuxuan Wuhan Univ Sch Power & Mech Engn Wuhan 430072 Peoples R China Wuhan Univ Hubei Key Lab Waterjet Theory & New Technol Wuhan 430072 Peoples R China

A fluid-structure interaction numerical model has been established to investigate the whipping effect on high energy pipe in this study. The validation test has been performed by the comparison with the experimental results and it is found that the fluid-structure interaction model can well predict the displacement and the maximum restraint force of the piping system. Then, the dimensionless displacement of the cantilever pipe and U-bolt restraints, the maximum restraint force and the maximum strain energy are used to evaluate the effect of flow rate, pulsation frequency, overhang length, initial clearance and friction coefficient on the whipping effect. The results illustrate that the dimensionless root-mean-square displacement of the cantilever pipe and U-bolt restraints increase to 5.31 times and 9.41 times, respectively as the flow rate increases. The mode transition phenomenon occurs as the flow rate increases to over 180 kg/s and 284 kg/s, respectively. When the pulsation frequencies are close to the first natural frequency of the cantilever pipe, the resonance effect can enhance the whipping effect and enlarge the displacement of U-bolt restraints. The increase of overhang length, initial clearance and friction coefficient can also intensify the whipping effect.

关键词： Whipping effect High energy pipe fluid-structure interaction U-bolt restraints

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A fast calculation method for the optimal clearance and stiffness of the aerostatic guideway considering fluid-structure interaction

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TRIBOLOGY INTERNATIONAL 2023年 183卷

作者： Qi, Lizi Zhu, Min Gao, Qiang Xu, Jingfeng Liu, Liang Wei, Wenyuan Lu, Lihua Harbin Inst Technol Sch Mechatron Engn Harbin Peoples R China Harbin Inst Technol Sch Elect Engn & Automat Harbin Peoples R China Chongqing Res Inst HIT Chongqing Peoples R China

The static performances of the aerostatic spindles/guideways are significantly affected by the fluid-structure interaction (FSI) effect. However, the existing two-way FSI calculation method for the aerostatic spindles and guideways is inefficient. It takes much time to calculate the optimal parameters and static performance in the design and study process. This paper proposes a fast calculation method for the optimal clearance and stiffness of the aerostatic guideway considering FSI, and the calculation process of a cruciform-layout aerostatic guideway was detailed as a case study. Moreover, the accuracy of the proposed fast calculation method is verified numerically and experimentally, which proves that the computational efficiency can be improved dozens or even hundreds of times under the premise of minor calculation errors.

关键词： Aerostatic guideway Optimal clearance and stiffness Fast calculation method fluid-structure interaction

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Seismic experiments on short coaxial multi-layered cylindrical shells with fluid-structure interaction in fast reactors

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ANNALS OF NUCLEAR ENERGY 2023年 194卷

作者： Zhao, Fei Lu, Daogang Liu, Qiang Zhang, Chaofan Wang, Mingzheng Liu, Yu Zhou, Yixian North China Elect Power Univ Sch Nucl Sci & Engn Beijing 102206 Peoples R China North China Elect Power Univ Beijing Key Lab Pass Safety Technol Nucl Energy Beijing 102206 Peoples R China China Inst Atom Energy Beijing 102413 Peoples R China

As the most important component of pool-type fast reactors, the main vessel contains most of the equipment for the primary circuit and thousands of tons of liquid sodium. The fluid-structure interaction effects of the coaxial multi-layer thin-walled cylindrical shells formed by the main vessel and its thermal shield cannot be neglected. Though the research on the fluid-structure interaction of the liquid in the pool is sufficient, the research on the short coaxial multi-layer cylindrical shells is not enough, especially the axial and circumferential mode shapes and the ratio of each mode under seismic conditions. So, it is necessary to study the fluid-structure interaction of short coaxial multilayer shells. This paper presents shaking table tests performed on double- and triple-layered cylindrical shells to investigate fluid-structure interaction and seismic response, respectively. The experiments reveal that when the aspect ratio is less than 2, Mode (1,6) exhibits the most significant response under sine wave excitation conditions, while Mode (1,1) demonstrates the highest response under seismic conditions. The first three modes are characterized as out-of-phase modes. Additionally, the pressure component of the first circumferential mode contributes 20% to the overall response of the first 12 modes under seismic conditions.

关键词： fluid added mass Multi-layered cylindrical shells Pool-type fast reactors fluid-structure interaction

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fluid-structure interaction analysis on motion control of a self-propelled flexible plate near a rigid body utilizing PD control

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BIOINSPIRATION & BIOMIMETICS 2021年第6期16卷 066002-066002页

作者： Luo, Yang Wright, Marvin Xiao, Qing Yue, Hong Pan, Guang Univ Strathclyde Dept Naval Architecture Ocean & Marine Engn Glasgow G4 0LZ Lanark Scotland Univ Strathclyde Dept Elect & Elect Engn Glasgow G4 0LZ Lanark Scotland Northwestern Polytech Univ Sch Marine Sci & Technol Xian 710072 Peoples R China

Inspired by a previous experimental study of fish swimming near a cylinder, we numerically investigate the swimming and station-holding behavior of a flexible plate ahead of a circular cylinder whose motion is controlled by a proportional-derivative (PD) controller. Specifically, the deformation of this two-dimensional plate is actuated by a periodically varying external force applied on the body surface, which mimics the fish muscle force to produce propulsive thrust. The actuation force amplitude is dynamically adjusted by a feedback controller to instruct the plate to swim the desired distance from an initial position to a target location and then hold the station there. Instead of directly using the instantaneous position signal, an average speed measured over one force actuation period is proposed with the inclusion of instantaneous position information to form the tracking error for the PD control. Our results show that the motion control of swimming and station holding has been achieved by this simple but effective feedback control without large overshoot when approaching the target at different flow conditions and actuation force formulas. Although the swimming distance remains the same, a plate whose initial position is closer to the cylinder requires less energy expenditure to swim to the target location and hold the station there. This is because the low-pressure zone near the trailing edge of the plate is reduced in size, which provides drag reduction, contributing to reduced swimming energy. A higher Reynolds number also leads to energy savings. Under the same control strategy, the swimming performance is more affected by the force-frequency while the phase shift of the actuation force has a less significant impact.

关键词： fish swimming control computational fluid dynamics fluid-structure interaction

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fluid-structure interaction of a flexible rotor in water

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JOURNAL OF fluidS AND structureS 2021年 103卷

作者： Eldemerdash, A. S. Leweke, T. Aix Marseille Univ IRPHE Cent Marseille CNRS F-13384 Marseille France

In this study, a moderately flexible rotor is investigated experimentally in a water channel. The rotor consists of a single blade with a simplified rectangular geometry and is tested with various pitch angles at different rotational speeds. The flapwise bending deformation and induced torsion of the blade are measured using image processing tools, and flow fields are extracted with Particle Image Velocimetry. The blade deformation behaviour depends strongly on the pitch angle, it includes extreme downstream and upstream bending for high negative and positive pitch, respectively. In addition, large-amplitude, low-frequency bending fluctuations are observed in a certain range of rotational speeds for negative pitch. The wake vorticity fields show large-scale recirculation zones being formed and intermittently shed behind the rotor, resembling the dynamics of the Vortex Ring State known from helicopter aerodynamics. A comparison with the flow generated by a rigid rotor of the same geometry is also carried out. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Flexible rotor fluid-structure interaction Particle Image Velocimetry Digital Image Correlation Vortex Ring State

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fluid-structure interaction of thin flexible bodies in multi-material multi-phase systems

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JOURNAL OF COMPUTATIONAL PHYSICS 2021年 429卷

作者： Vahab, Mehdi Sussman, Mark Shoele, Kourosh Florida State Univ Tallahassee FL 32306 USA

A numerical approach for the modeling and simulation of fluid-structure interaction (FSI) in multi-material and multi-phase systems with potential phase-changes dynamics is presented. The boundary conditions at the interface between the fluids and structures are enforced using an immersed boundary technique to couple the Eulerian multi-material solver to the Lagrangian structural solver and maintain the solution algorithm's efficiency. The phase-change dynamics are modeled to consider the volume expansion/shrinkage due to the density difference in materials. The algorithm for material phase-change includes a sub-grid model near triple points and benefits from the volume-conservative continuous moment-of-fluid (CMOF) reconstruction method for smooth material domain representation. A systematic stability criterion for the coupled problems with the proposed FSI technique is derived, and the accuracy of the method is verified and tested with multiple canonical problems. The technique is employed to explore the effects of the active vortex generation of a flapping plate on the momentum and thermal dynamics of the nucleate pool boiling phenomenon in a cross-flow in two and three-dimensional setups. (C) 2020 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Multi-phase flow Phase-change Boiling process Thin structure

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An analysis of fluid-structure interaction coupling mechanisms in liquid-filled viscoelastic pipes subject to fast transients

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JOURNAL OF fluidS AND structureS 2023年 121卷

作者： Andrade, Douglas Monteiro Rachid, Felipe Bastos de Freitas Tijsseling, Arris Sieno Univ Fed Fluminense Dept Mech Engn TEM Grad Program Mech Engn PGMEC Rua Passo Patria 156 BR-24210240 Niteroi RJ Brazil Eindhoven Univ Technol Dept Math & Comp Sci Eindhoven Netherlands

An extension of a recently developed quasi-2D flow model for fluid transients in viscoelastic pipes to handle fluid-structure interaction mechanisms is presented. In a context in which the fluid flow is devised as a structured pseudo-mixture and the pipe's viscoelasticity is rooted in an internal variable theory, the axial movement of the pipe wall is allowed to occur, giving rise to friction, Poisson, and junction coupling mechanisms. The resulting governing equations of the model form a quasi-linear hyperbolic system of partial differential equations, which approximated solution is achieved by means of the method of characteristics. The proposed approach is validated against pressure traces acquired from a reservoir-pipe-valve experimental setup found in the literature. In the course of the validating process, different pipe anchoring conditions are employed to study the system responses. Focus is given to pipe-fluid interface interactions, energy dissipation, and transfer of energy between both media. (c) 2023 Elsevier Ltd. All rights reserved.

关键词： Unsteady flow fluid transient fluid-structure interaction Viscoelastic pipe Energy dissipation

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Characterization of fibronectin properties by integrated micro-fluidic experiments and fluid-structure interaction simulations

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JOURNAL OF BIOMECHANICS 2023年 150卷 111505-111505页

作者： Ke, Renjie Kucukal, Erdem Gurkan, Umut A. Li, Bo Case Western Reserve Univ Dept Mech & Aerosp Engn Cleveland OH 44106 USA Peking Univ Coll Engn Beijing 100871 Peoples R China

Fibronectin (Fn) has been observed to assemble in the extracellular matrix (ECM) of cell culture and stretch in response to the external force. The alteration of molecule domain functions generally follows the extension of Fn. Several researchers have investigated fibronectin extensively in molecular architecture and conformation structure. However, the bulk material behavior of the Fn in the ECM has not been fully depicted at the cell scale, and many studies have ignored physiological conditions. Conversely, microfluidic techniques that explore cellular properties based on cell deformation and adhesion have emerged as a powerful and effective platform to study cell rheological transformation in a physiological environment. However, directly quantifying properties from microfluidic measurements remains a challenge. Therefore, it is an efficient way to combine experimental measurements with a robust and reliable numerical framework to calibrate the mechanical stress distribution in the test sample. In this paper, we present a monolithic Lagrangian fluid-structure interaction (FSI) approach within the Optimal Transportation Meshfree (OTM) framework that enables the investigation of the adherent Red Blood Cell (RBC) interacting with fluid and overcomes the drawbacks of the traditional computational tools such as the mesh entanglement and interface tracking, etc. This study aims to assess the material properties of the RBC and Fn fiber by calibrating the numerical predictions to experimental measurements. Moreover, a physical -based constitutive model will be proposed to describe the bulk behavior of the Fn fiber inflow, and the rate -dependent deformation and separation of the Fn fiber will be discussed.

关键词： Micro-fluidic experiments fluid-structure interaction Mesh-free Red blood cells Fibronectin Integrated framework

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A numerical 3D fluid-structure interaction model for blood flow in a MRI-based atherosclerotic artery

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MATHEMATICAL MODELLING OF NATURAL PHENOMENA 2023年 18卷

作者： El Khatib, Nader Kafi, Oualid Oliveira, Diana Sequeira, Adelia Tiago, Jorge Lebanese Amer Univ Dept CS & Math Byblos Lebanon Univ Lisbon CEMAT Ctr Computat & Stochast Math Lisbon Portugal UCL Dept Mech Engn London England Univ Lisbon Dept Math Inst Super Tecn Lisbon Portugal

Atherosclerosis, as a result of an inflammatory process, is the thickening and loss of elasticity of the walls of arteries that is associated with the formation of atherosclerotic plaques within the arterial intima, which present a double threat. A piece of vulnerable plaque can break off and be carried by the bloodstream until it gets stuck;and plaque that narrows an artery may lead to a thrombus that sticks to the blood vessel's inner wall. The purpose of the present article is to compare effects across different atheromatous plaque material assumptions on hemodynamics and biomechanics within a partly patient-specific computational domain representing an atherosclerotic artery. A full scale 3D ESI numerical model is implemented and different material hyperelastic assumptions are considered for comparison purposes. The 3D realistic geometry is reconstructed from a medical image. This technique may be useful, specially with the recent advances in computer-aided design (CAD), medical imaging, and 3D printing technologies that have provided a rapid and cost efficient method to generate arterial stenotic biomodels, making in vitro studies a valuable and powerful tool. To understand our results, hemodynamic parameters and structural stress analysis were performed. The results are consistent with previous findings.

关键词： Atherosclerosis blood flow fluid-structure interaction MRI imaging

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