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Simulation of fluid-structure interaction in Extracorporeal Membrane Oxygenation Circulatory Support Systems

JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH 2022年第2期15卷 249-257页

作者： Nezami, Farhad R. Ramezanpour, Mehdi Khodaee, Farhan Goffer, Efrat Edelman, Elazer R. Keller, Steven P. MIT Inst Med Engn & Sci 77 Massachusetts Ave Cambridge MA 02139 USA Harvard Med Sch Brigham & Womens Hosp Dept Surg Thorac & Cardiac Surg Boston MA 02115 USA Univ Pittsburgh Dept Mech Engn Pittsburgh PA 15261 USA Harvard Med Sch Brigham & Womens Hosp Dept Med Cardiovasc Med Boston MA 02115 USA Harvard Med Sch Brigham & Womens Hosp Dept Med Pulm & Crit Care Med Boston MA 02115 USA

Extracorporeal membrane oxygenation (ECMO) is a vital mechanical circulatory support modality capable of restoring perfusion for the patient in circulatory failure. Despite increasing adoption of ECMO, there is incomplete understanding of its effects on systemic hemodynamics and how the vasculature responds to varying levels of continuous retrograde perfusion. To gain further insight into the complex ECMO:failing heart circulation, computational fluid dynamics simulations focused on perfusion distribution and hemodynamic flow patterns were conducted using a patient-derived aorta geometry. Three case scenarios were simulated: (1) healthy control;(2) 90% ECMO-derived perfusion to model profound heart failure;and, (3) 50% ECMO-derived perfusion to model the recovering heart. fluid-structure interface simulations were performed to quantify systemic pressure and vascular deformation throughout the aorta over the cardiac cycle. ECMO support alters pressure distribution while decreasing shear stress. Insights derived from computational modeling may lead to better understanding of ECMO support and improved patient outcomes.

关键词： Extracorporeal membrane oxygenation Mechanical circulatory support fluid-structure interaction Computational fluid dynamics

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Existence of a weak solution to a nonlinear fluid-structure interaction problem with heat exchange

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COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS 2022年第8期47卷 1591-1635页

作者： Macha, Vaclav Muha, Boris Necasova, Sarka Roy, Arnab Trifunovic, Srdan Acad Sci Czech Republ Inst Math Prague Czech Republic Univ Zagreb Fac Sci Dept Math Zagreb Croatia BCAM Bilbao Bizkaia Spain Univ Novi Sad Fac Sci Dept Math & Informat Novi Sad Serbia

In this paper, we study a nonlinear interaction problem between a thermoelastic shell and a heat-conducting fluid. The shell is governed by linear thermoelasticity equations and encompasses a time-dependent domain which is filled with a fluid governed by the full Navier-Stokes-Fourier system. The fluid and the shell are fully coupled, giving rise to a novel nonlinear moving boundary fluid-structure interaction problem involving heat exchange. The existence of a weak solution is obtained by combining three approximation techniques - decoupling, penalization and domain extension. In particular, the penalization and the domain extension allow us to use the methods already developed for compressible fluids on moving domains. In such a way, the proof is more elegant and the analysis is drastically simplified. Let us stress that this is the first time the heat exchange in the context of fluid-structure interaction problems is considered.

关键词： fluid-structure interaction heat-conducting fluid Navier-Stokes-Fourier system thermoelasticity

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A steady modeling method to study the effect of fluid-structure interaction on the thrust stiffness of an aerostatic spindle

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ENGINEERING APPLICATIONS OF COMPUTATIONAL fluid MECHANICS 2022年第1期16卷 453-468页

作者： Liu, Liang Lu, Lihua Yu, Kaicheng Gao, Qiang Zhao, Hang Chen, Wanqun Harbin Inst Technol Sch Mechatron Engn Harbin Peoples R China

Under support forces from static pressure bearings, the solid deformations of static pressure spindle or slide systems will affect their performance, especially for those with high load-carrying capacity and stiffness. This paper proposes a steady modeling method to study the effect of fluid-structure interaction (FSI) on the thrust stiffness of an H-shaped aerostatic spindle. The proposed method can be readily applied to different static pressure spindles or slides, and can save a lot of time compared with the transient method, which is generally used to consider the phenomenon of FSI. The method proposed in this study is more suitable for studying the performance of spindles and slides with high load-carrying capacity and stiffness, especially in the design phase. In this paper, solid deformations, pressure distributions and the thrust stiffness are all obtained based on this method. Moreover, the effects of the axial position of the spindle and the air film thickness on the thrust stiffness are studied. The proposed method is verified by experimental results. The calculation error of the proposed method is reduced by nearly 77% compared with the traditional method ignoring FSI.

关键词： fluid-structure interaction thrust stiffness aerostatic spindle aerostatic bearing

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fluid-structure interaction study of bio-magnetic fluid in a wavy bifurcated channel with elastic walls

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FRONTIERS IN PHYSICS 2022年 10卷

作者： Shahzad, Hasan Wang, Xinhua Raizah, Zehba Riaz, Arshad Majeed, Afraz Hussain Anwar, Muhammad Adnan Eldin, Sayed M. Beijing Univ Technol Coll Mech Engn & Appl Elect Technol Fac Mat & Mfg Beijing Peoples R China King Khalid Univ Coll Sci Dept Math Abha Saudi Arabia King Khalid Univ Res Ctr Adv Mat Sci RCAMS Abha Saudi Arabia Univ Educ Dept Math Div Sci & Technol Lahore Pakistan Air Univ Dept Math Islamabad Pakistan Syed Babar Ali Sch Sci & Engn Dept Math Lahore Pakistan Future Univ Egypt Fac Engn Ctr Res New Cairo Egypt

As a result of its wide range of applications, FSI has grabbed the attention of researchers and scientists. In this study we consider an incompressible, laminar fluid flowing through the bifurcated channel. The wavy walls of the channel are considered elastic. Moreover, a magnetic field is applied towards the axial direction of the flow. Using a two-way fluid-structure interaction, an Arbitrary Lagrangian-Eulerian (ALE) formulation is used for coupling the problem. The problem is discretized using P 2 and P 1 finite element methods to approximate the displacement, pressure, and velocity. The linearized system of equations is solved using Newton's iterative scheme. The analysis is carried out for the Reynolds number and Hartman number. The ranges of the studied parameters are Reynolds number 300 & LE;R e & LE;1000 and Hartmann number 0 & LE;H a & LE;10 . The hemodynamic effects on the bifurcated channel and elastic walls are calculated using velocity, pressure, wall shear stresses (WSS), and loads at the walls. The study shows there is an increase in boundary load as the values of the Hartman number increase hence WSS increases. On the other hand, an increase in the Reynolds number increases the resistance forces hence velocity and WSS decrease. Also, numerical values of WSS for rigid and elastic walls are calculated. Studies showed that WSS decreases for the FSI case when compare to CFD (computational fluid dynamic) case.

关键词： fluid-structure interaction wall shear stress finite element method bifurcation biomagnetic fluid elastic walls

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fluid-structure interaction in Z-shaped pipe with different supports

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Acta Mechanica Sinica 2020年第2期36卷 513-523页

作者： Q.Guo J.X.Zhou X.L.Guan College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Highway Science and Technology Research Institute Xinjiang Production and Construction Corpsürümqi 830002China

fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery *** is liable to cause local ***,FSI analysis is necessary in many cases,especially for flexible pipe *** modeling consists of eight governing equations and then completely solved via the finite volume method(FVM).Friction,Poisson and joint couplings were discussed in detail to reveal the influence of a Z-shaped pipe with different supports and elbows on *** the feasibility of solving FSI by FVM was verified,the different effects of free,fixed and elastic supports on FSI in the commonly used and simplified Z-shaped pipe were further *** indicated that different support stiffness lead to various FSI *** coupling occurs at the elbow and less support is considered,then the pipe has a relatively large amplitude and complex pressure fluctuation.

关键词： fluid-structure interaction Finite volume method Z-shaped pipe Support stiffness

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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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fluid-structure interaction simulation of aortic blood flow by ventricular beating: a preliminary model for blunt aortic injuries in vehicle crashes

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INTERNATIONAL JOURNAL OF CRASHWORTHINESS 2020年第3期25卷 299-306页

作者： Wei, Wei Kahn, Cyril J. F. Behr, Michel Aix Marseille Univ IFSTTAR Marseille France

Blunt aortic injuries are common and severe in motor vehicle crash accidents (MVCAs), but the injury mechanisms, which can be categorised as kinematics and hydrodynamics aspects, remain to be uncertain. In this study, a finite element model was developed for the aorta-heart system with fluid-structure interaction methods, aimed to study both kinds of mechanisms simultaneously. The aortic blood flow was generated by simulating left ventricle contraction. This model was further integrated with a human body model to reconstruct a real car crash case. The aorta-heart model was validated against ventricular volume, blood pressure, velocity, flow rate and wall shear stress. The integrated model predicted aorta isthmus laceration and other injuries consistent with the case injury reports. The cardiac output during the accident was more intense than the physiological output, proving the ability of current simulation approach to capture the blood flow modification by the thoracic compressive loadings during accidents.

关键词： Aortic injury left ventricle contraction fluid-structure interaction fluid dynamics motor vehicle crash accidents

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fluid-structure interaction modeling of blood flow in the pulmonary arteries using the unified continuum and variational multiscale formulation

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MECHANICS RESEARCH COMMUNICATIONS 2020年 107卷 103556-103556页

作者： Liu, Ju Yang, Weiguang Lan, Ingrid S. Marsden, Alison L. Stanford Univ Dept Bioengn Dept Pediat Cardiol Clark Ctr E1-3318 Campus Dr Stanford CA 94305 USA Stanford Univ Inst Computat & Math Engn Clark Ctr E1-3318 Campus Dr Stanford CA 94305 USA

In this work, we present a computational fluid-structure interaction (FSI) study for a healthy patient-specific pulmonary arterial tree using the unified continuum and variational multiscale (VMS) formulation we previously developed. The unified framework is particularly well-suited for FSI, as the fluid and solid sub-problems are addressed in essentially the same manner and can thus be uniformly integrated in time with the generalized-amethod. In addition, the VMS formulation provides a mechanism for large-eddy simulation in the fluid sub-problem and pressure stabilization in the solid sub-problem. The FSI problem is solved in a quasi-direct approach, in which the pressure and velocity in the unified continuum body are first solved, and the solid displacement is then obtained via a segregated algorithm and prescribed as a boundary condition for the mesh motion. Results of the pulmonary arterial FSI simulation are presented and compared against those of a rigid wall simulation. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Unified continuum model Variational multiscale formulation fluid-structure interaction Cardiovascular biomechanics Pulmonary artery

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fluid-structure interaction simulations of patient-specific aortic dissection

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2020年第5期19卷 1607-1628页

作者： Baeumler, Kathrin Vedula, Vijay Sailer, Anna M. Seo, Jongmin Chiu, Peter Mistelbauer, Gabriel Chan, Frandics P. Fischbein, Michael P. Marsden, Alison L. Fleischmann, Dominik Stanford Univ Dept Radiol 3D & Quantitat Imaging Lab Stanford CA 94305 USA Stanford Univ Dept Pediat Cardiol Stanford CA 94305 USA Stanford Univ Dept Cardiothorac Surg Stanford CA 94305 USA Univ Magdeburg Dept Simulat & Graph Magdeburg Germany Stanford Univ Dept Bioengn Stanford CA 94305 USA

Credible computational fluid dynamic (CFD) simulations of aortic dissection are challenging, because the defining parallel flow channels-the true and the false lumen-are separated from each other by a more or less mobile dissection membrane, which is made up of a delaminated portion of the elastic aortic wall. We present a comprehensive numerical framework for CFD simulations of aortic dissection, which captures the complex interplay between physiologic deformation, flow, pressures, and time-averaged wall shear stress (TAWSS) in a patient-specific model. Our numerical model includes (1) two-way fluid-structure interaction (FSI) to describe the dynamic deformation of the vessel wall and dissection flap;(2) prestress and (3) external tissue support of the structural domain to avoid unphysiologic dilation of the aortic wall and stretching of the dissection flap;(4) tethering of the aorta by intercostal and lumbar arteries to restrict translatory motion of the aorta;and a (5) independently defined elastic modulus for the dissection flap and the outer vessel wall to account for their different material properties. The patient-specific aortic geometry is derived from computed tomography angiography (CTA). Three-dimensional phase contrast magnetic resonance imaging (4D flow MRI) and the patient's blood pressure are used to inform physiologically realistic, patient-specific boundary conditions. Our simulations closely capture the cyclical deformation of the dissection membrane, with flow simulations in good agreement with 4D flow MRI. We demonstrate that decreasing flap stiffness from Eflap=800 kPa (a) increases the displacement of the dissection flap from 1.4 to 13.4 mm, (b) decreases the surface area of TAWSS by a factor of 2.3, (c) decreases the mean pressure difference between true lumen and false lumen by a factor of 0.63, and (d) decreases the true lumen flow rate by up to 20% in the abdominal aorta. We conclude that the mobility of the dissection flap substantially i

关键词： Aortic dissection Computational hemodynamics fluid-structure interaction Prestress Tissue support 4D flow MRI

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fluid-structure interaction effects on the dynamics of a moving deformable hydrofoil in a fluid flow 14th

Fluid-structure interaction effects on the dynamics of a mov...

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14th European Wave and Tidal Energy Conference, EWTEC 2021

作者： Brousseau, P. Benaouicha, M. Guillou, S. Cherbourg University Laboratory of Applied Sciences LUSAC-University of Caen Normandy 60 rue Max-Pol Fouchet Cherbourg-Octeville 50130 France SEGULA TECHNOLOGIES Research and Innovation Unit in Naval and Energy engineering France and with the Cherbourg University Laboratory of Applied Sciences LUSAC-University of Caen Normandy 19 Rue d’Arras 92000 Nanterre 60 rue Max-Pol Fouchet Cherbourg-Octeville 50130 France

The paper focuses on the study of a semiactivated system, based on a combination of a two movements of forced pitching and free heaving motion. Therefore, quantifying with accuracy the hydrodynamic forces applied on the hydrofoil seems to be crucial. This is investigated throughout a numerical modeling of a 2D flexible hydrofoil dynamics, immersed in a fluid flow with a Reynolds number of 2000. In this study, the hydrofoil is animated by a combined forced pitching and heaving movements. Various materials of the structure are studied, from the rigid material to a more flexible one. The fluid-structure interaction (FSI) effects are considered using a partitioned implicit coupling scheme. The Arbitrary Lagrangian-Eulerian (ALE) formulation of the Navier-Stokes equations is applied. Both the viscous incompressible Navier-Stokes equations and the elasticity equation are solved using finite volume method. The study is based on the analysis of the hydrodynamic loads acting on the structure. Therefore, the induced dynamics and the power coefficient of the structure are investigated. It is shown that the flexibility of the hydrofoil has an effect on its hydrodynamic behaviour and that in some configurations, the structure deformations can improve the device energy efficiency. © European Wave and Tidal Energy Conference 2021.

关键词： Deformable structure fluid-structure interaction Numerical simulation Oscillating hydrofoil

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