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Advanced Radial Basis Functions Mesh Morphing for High Fidelity fluid-structure interaction with Known Movement of the Walls: Simulation of an Aortic Valve 20th

Advanced Radial Basis Functions Mesh Morphing for High Fidel...

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20th Annual International Conference on Computational Science (ICCS)

作者： Geronzi, Leonardo Gasparotti, Emanuele Capellini, Katia Cella, Ubaldo Groth, Corrado Porziani, Stefano Chiappa, Andrea Celi, Simona Biancolini, Marco Evangelos Fdn Toscana G Monasterio Heart Hosp BioCardioLab Bioengn Unit Massa Italy Univ Pisa Dept Informat Engn Pisa Italy RBF Morph Srl Rome Italy Univ Roma Tor Vergata Dept Enterprise Engn Rome Italy

ISBN: (纸本)9783030504335;9783030504328

High fidelity fluid-structure interaction (FSI) can be tackled by means of non-linear Finite Element Models (FEM) suitable to capture large deflections of structural parts interacting with fluids and by means of detailed Computational fluid Dynamics (CFD). High fidelity is gained thanks to the spatial resolution of the computational grids and a key enabler to have a proper exchange of information between the structural solver and the fluid one is the management of the interfaces. A class of applications consists in problems where the complex movement of the walls is known in advance or can be computed by FEM and has to be transferred to the CFD solver. The aforementioned approach, known also as one-way FSI, requires effective methods for the time marching adaption of the computation grid of the CFD model. A versatile and well established approach consists in a continuum update of the mesh that is regenerated so to fit the evolution of the moving walls. In this study, an innovative method based on Radial Basis Functions (RBF) mesh morphing is proposed, allowing to keep the same mesh topology suitable for a continuum update of the shape. A set of key configurations are exactly guaranteed whilst time interpolation is adopted between frames. The new framework is detailed and then demonstrated, adopting as a reference the established approach based on remeshing, for the study of a Polymeric-Prosthetic Heart Valve (P-PHV).

关键词： Morphing RBF Multi-physics RBF Morph FSI fluid-structure interaction Polymeric aortic valve Aortic valve

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Local hemodynamic analysis of the C-Pulse Device by 3D fluid-structure interaction simulation

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FUTURE CARDIOLOGY 2020年第4期16卷 297-308页

作者： Attaran, Seyed Hamidreza Niroomand-oscuii, Hanieh Ghalichi, Farzan Sahand Univ Technol Dept Biomed Engn Tabriz Iran

Background: C-Pulse is a new, nonblood contacting device based on the concept of counter-pulsation that is designed for long-term implantation. However, there is a lack of comprehensive investigation of the pressure and velocity fields under the action of C-Pulse. Aim: In this paper, we aim to conduct a numerical simulation of the underlying mechanism of the device in order to analyze its performance and related undesirable issues. Materials & methods: A 3D finite element model is utilized to simulate the mechanism of the blood pumping. Results & conclusion: The simulation well reproduced the essential characteristics of the C-Pulse. Preliminary results were in a reasonable range while a couple of irregular flow patterns were identified.

关键词： blood flow C-Pulse finite element method fluid-structure interaction numerical simulation

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Numerical simulation of flow past stationary and oscillating deformable circles with fluid-structure interaction

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EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW 2020年第3期2卷 151-161页

作者： Liu, Xu Gui, Nan Wu, Hao Yang, Xingtuan Tu, Jiyuan Jiang, Shengyao Tsinghua Univ Collaborat Innovat Ctr Adv Nucl Energy Technol Inst Nucl & New Energy Technol Key Lab Adv Reactor Engn & SafetyMinist Educ Beijing 100084 Peoples R China RMIT Univ Sch Engn Melbourne Vic 3083 Australia

The oscillation and deformation of the tube affect its safe and efficient operation in the shell-and-tube heat exchanger of the nuclear power plant. To offer in-depth understandings, numerical simulation of the flow around the cylinder (or particle) was carried out here by using COMSOL Multiphysics as a research tool. This paper mainly discusses the influence of physical parameters (elastic modulus and Poisson's ratio) and lateral oscillation on the flow around the circles (cylinder or particle). The physical property parameters have a greater influence on the deformation, lift coefficient, and drag coefficient of the object, and it basically does not affect the vortex shedding frequency. After analyzing the flow around the oscillating particle, four kinds of vortex separation modes (AI, AII, S, S-S modes) are defined. In addition, the lift coefficient and drag coefficient for different modes are discussed. The phenomenon of "frequency locking" occurs in the flow around the oscillating particle. Simulation results prove that the separation frequency of vortex is related to the oscillation frequency.

关键词： flow around cylinder particle flow induced oscillation fluid-structure interaction vortex shedding heat exchange reactor thermal hydraulics

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Concept for the experimental and numerical study of fluid-structure interaction and gas transport in Precise Electrochemical Machining

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Procedia CIRP 2021年 102卷 204-209页

作者： B. Rommes D. Lauwers T. Herrig M. Meinke W. Schrder A. Klink Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University Campus-Boulevard 30 52074 Aachen Germany Chair of Fluid Mechanics and Institute of Aerodynamics (AIA) RWTH Aachen University Wllnerstr. 5a 52062 Aachen Germany

The biggest challenge in precise electrochemical machining (pECM) remains the highly time and cost consuming tool and process design. The development of deterministic and automated design methods requires a physics-based understanding of the individual phenomena influencing the removal rate and structural vibration of the workpiece during the machining process and the exact geometry of the final product. A concept study for the quantitative prediction of the fluid-structure interaction (FSI) between the multiphase electrolyte flow and the workpiece electrode is presented. This includes a novel experimental setup for the pECM process, in which the machining gap is upscaled using the principles of dynamic similarity. This enables the application of 3D particle image velocimetry for detailed measurements including a tracking of the workpiece deflections. The experimental results are used for the validation of a computational fluid dynamics method especially developed for the multiphase electrolyte flow. First results of numerical simulations focusing on the gas transport in the turbulent multiphase electrolyte flow are discussed.

关键词： Precise Electrochemical Machining fluid-structure interaction Particle-Image Velocimetry Reynolds scaling

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Computational fluid-structure interaction of Soft Tissues Using an Immersed-Boundary Method

Computational Fluid-Structure Interaction of Soft Tissues Us...

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作者： Chen, Ye Vanderbilt University

学位级别：Ph.D.

fluid-structure interaction (FSI) of a soft tissue exists in many places in human body (e.g., heart and venous valves, vocal fold, blood vessels, kidney, aneurysm, sleep apnea). Computational modeling of these FSI problems has potential applications in diagnostics, disease management, surgical planning, and device design, and so on. We use an immersed-boundary method coupled with the finite-element method to solve the three-dimensional (3D) FSI problems involving complex anatomy and tissue deformations. A 3D domain decomposition strategy is incorporated in parallel computing to greatly accelerate the flow simulation. We consider specifically the FSI of aortic valve and vocal fold using the same computational framework, where blood and air are governed by the viscous incompressible Navier-Stokes equation. In the case of aortic valve, we focused on effect of the leaflets’ bending rigidity on blood flow, valve deformation, and the hemodynamic force on the valve. The thickness of the leaflets is varied to span a wide range of non-dimensional bending rigidity that is normalized by the transvalvular pressure gradient. The results suggest that there is an optimal range of bending rigidity for the valve. In addition to 3D simulations, we have also developed a novel one-dimensional (1D) unsteady flow model, which takes into consideration of valve movement and pressure loss. We use this 1D flow model in place of 3D flow in the FSI simulation. The results show that the hybrid simulation is able to capture reasonably well deformation of the leaflets, the valve opening area, and the flow rate. In the case of vocal fold, we aim to develop patient-specific modeling tools to simulate vibration of vocal fold during phonation. We have developed an efficient 1D flow model that can be used in estimation of unknown tissue stiffness or optimization of the implant in medialization laryngoplasty. Both idealized and realistic laryngeal models are set up to test the performance of the reduce

关键词： fluid-structure interaction Immersed-Boundary Method

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COMPUTATIONAL fluid-structure interaction OF SOFT TISSUES USING AN IMMERSED-BOUNDARY METHOD

COMPUTATIONAL FLUID-STRUCTURE INTERACTION OF SOFT TISSUES US...

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学位级别：博士

fluid—structure interaction (FSI) of a soft tissue exists in many places in human body (e.g., heart and venous valves, vocal fold, blood vessels, kidney, aneurysm, sleep apnea). Computational modeling of these FSI problems has potential applications in diagnostics, disease management, surgical planning, and device design, and so on. We use an immersed-boundary method coupled with the finite-element method to solve the three-dimensional (3D) FSI problems involving complex anatomy and tissue deformations. A 3D domain decomposition strategy is incorporated in parallel computing to greatly accelerate the flow simulation. We consider specifically the FSI of aortic valve and vocal fold using the same computational framework, where blood and air are governed by the viscous incompressible Navier—Stokes equation. In the case of aortic valve, we focused on effect of the leaflets’ bending rigidity on blood flow, valve deformation, and the hemodynamic force on the valve. The thickness of the leaflets is varied to span a wide range of non-dimensional bending rigidity that is normalized by the transvalvular pressure gradient. The results suggest that there is an optimal range of bending rigidity for the valve. In addition to 3D simulations, we have also developed a novel one-dimensional (1D) unsteady flow model, which takes into consideration of valve movement and pressure loss. We use this 1D flow model in place of 3D flow in the FSI simulation. The results show that the hybrid simulation is able to capture reasonably well deformation of the leaflets, the valve opening area, and the flow rate. In the case of vocal fold, we aim to develop patient-specific modeling tools to simulate vibration of vocal fold during phonation. We have developed an efficient 1D flow model that can be used in estimation of unknown tissue stiffness or optimization of the implant in medialization laryngoplasty. Both idealized and realistic laryngeal models are set up to test the performance of the r

关键词： fluid-structure interaction Immersed-Boundary Method

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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 6-6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 and simulation of fluid-structure interaction using smoothed particle hydrodynamics

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Materials Today: Proceedings 2021年 47卷 3205-3209页

作者： Justin Antony Ranjith Maniyeri Biophysics Laboratory Department of Mechanical Engineering National Institute of Technology Karnataka (NITK) Surathkal Mangalore 575025 Karnataka India

Analyzing fluid–structure interactions (FSI) is crucial in many engineering applications from modeling of blood flow to design of aircrafts. FSI problems are normally simulated using grid based methods, which is complicated and challenging due to the difficulties in modeling large deformations. In this work, we present a numerical model developed for solving FSI problems using smoothed particle hydrodynamics (SPH), which is a meshless particle based Lagrangian method widely used for solving fluid mechanics and heat transfer problems. Being meshless method, the discretization of complex domains and treatment of large deformations becomes easier in SPH. It has an attractive feature that the interpolating nodes also function as material component by carrying properties of the material and move according to the internal and external interactions. SPH uses a smoothing kernel function to approximate the field variables and its derivatives at a node from its neighboring nodes. With this perspective, we developed a numerical model to simulate the flow through a square lattice of stationary cylinders. The developed model captured the fluid dynamics and the velocity contour and the streamlines plot obtained are in good agreement with available results in the literature. We believe that this model can be extended to investigate complex fluid–structure interaction problems involving moving and deformable structures.

关键词： fluid-structure interaction Meshless particle methods Smoothed particle hydrodynamics

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Analysis of vortex cooling fluid-structure interaction under different vortex chamber curvature

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INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2021年 170卷 107154-107154页

作者： Li, Hong-Wei Gao, Yin-Feng Du, Chang-He Hong, Wen-Peng Northeast Elect Power Univ Sch Energy & Power Engn Jilin 132012 Jilin Peoples R China

The vortex cooling with cascade channel and blade leading edge solid region is established. The flow and heat transfer properties of vortex cooling region, and the stress and displacement properties of blade solid region are analyzed by the fluid-structure interaction method. The ellipses edges with vertical axis to horizontal axis ratio a/ b of 0.48, 0.72, 1.00, 1.31 and 1.73 are utilized to form the vortex chamber with different curvature. Influences of vortex chamber curvature on the vortex cooling fluid-structure interaction characteristics are researched to reveal the vortex cooling high heat transfer mechanism deeply. Results show that, for a/b decreasing from 1.73 to 0.48, the overall average Nusselt number and comprehensive heat transfer factor will first increase and then decrease, and the drag coefficient will gradually decrease. As a/b decreases, the high Nusselt number region moves from the target wall next to the nozzle to the target wall under the nozzle and at the vortex chamber bottom. With decreasing a/b, the thermal stress and thermal displacement on the blade pressure surface grad-ually decrease, while on the blade suction surface the thermal stress first decreases and then increases, and the thermal displacement first increases, then decreases and finally increases. In this study, compared with a/b = 1.73, the heat transfer performance for a/b = 0.72 has been enhanced by 21.00% and can provide the best protection for the blade.

关键词： Vortex cooling fluid-structure interaction Vortex chamber curvature Flow and heat transfer

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Biomechanics of Breastfeeding: fluid-structure interaction Simulation of Milk Expression

Biomechanics of Breastfeeding: Fluid-Structure Interaction S...

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作者： Azarnoosh, Jamasp The University of Texas at Dallas

学位级别：Ph.D., Doctor of Philosophy

Breastfeeding is a highly dynamic and complex mechanism. There are two theories for the dynamics of milk expression by the infant. One hypothesis is that milk expression is due to negative pressure applied by infant sucking; the alternative hypothesis is that the tongue movement and squeezing of nipple/areola due to mouthing is responsible for the extraction of milk from the nipple. In this study, a 3-D fluid-structure interaction (FSI) simulation is conducted to investigate the factors that play the primary role in milk expression from the nipple. The models include solid deformation and periodic motion of the tongue and jaw movement. To obtain boundary conditions, ultrasound images of the oral cavity, and motion of tongue movement during breastfeeding are extracted in parallel to the intra-oral vacuum pressure. The numerical results are cross-validated with clinical data. The results show that, while vacuum pressure plays an important role in the volume of milk removal, the tongue/jaw movement is essential for facilitating this procedure by decreasing the shear stress within the main duct. The developed model can contribute to a better understanding of breastfeeding complications that are due to physical infant and/or breast abnormalities and for the design of medical devices such as artificial teats and breast pumps. The second part of this study focuses on investigation of the non-Newtonian behavior of the milk during breastfeeding. The accumulated milk from the nipple varies depending on the milk properties and transient flow rate during the suckling cycle. The rheological studies on raw human milk have indicated non-Newtonian shear-thinning flow behavior. There exists no prior numerical simulation in the area of breastfeeding to study the non-Newtonian flow behavior inside the milk ducts. The novelty of this study is to investigate the non-Newtonian milk flow through the breast ductal system using fluid-structure interaction (FSI) simulation. The geometry of a

关键词： Breastfeeding Lactation Breast milk Computational fluid dynamics Finite element method fluid-structure interaction Non-Newtonian fluids

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