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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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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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CFD SIMULATIONS OF TWO TANDEM SEMI-SUBMERSIBLE FLOATING OFFSHORE WIND TURBINES USING A FULLY-COUPLED fluid-structure-interaction SIMULATION METHODOLOGY 4

CFD SIMULATIONS OF TWO TANDEM SEMI-SUBMERSIBLE FLOATING OFFS...

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ASME 4th International Offshore Wind Technical Conference (IOWTC)

作者： Xie, Shengbai Sadique, Jasim Convergent Sci Inc Madison WI 53719 USA

ISBN: (纸本)9780791886618

A fully coupled methodology for simulating floating offshore wind turbines is developed within the framework of CONVERGE CFD software. This methodology utilizes the following models which are solved together in a coupled manner: wind-wave models, turbine rotor/blade models, mooring cable models, and a 6-degree-of-freedom rigid-body fluid-structure interaction (FSI) model. The methodology is benchmarked with the OC4 FOWT experimental and simulation data under various wind-wave conditions. This approach is then used to study tandem floating offshore wind turbines under various wind-wave conditions to gain an in-depth understanding of the interactions of floating offshore wind turbines (FOWTs) in real-world conditions. It is found that the power efficiency of an offshore wind farm can be improved by the wave-induced enhancement in the wake recovery.

关键词： offshore wind turbine CFD fluid-structure interaction

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Biomechanical mechanisms behind the distal false lumen enlargement after TEVAR for type b aortic dissections: A computational one-way fluid-structure interaction study

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JOURNAL OF BIOMECHANICS 2025年 188卷 112756-112756页

作者： Li, Junheng Wang, Shuaishuai Wang, Songchen Sun, Cuiru Dai, Xiangchen Liu, Haofei Tianjin Univ Dept Mech 92 Weijin Rd Tianjin Peoples R China Tianjin Med Univ Gen Hosp Dept Gen Surg 154 Anshan Rd Tianjin Peoples R China

Distal false lumen (FL) expansion is a common complication after thoracic endovascular aortic repair (TEVAR) of type-B aortic dissection (TBAD). FL expansion is likely to cause post dissection aortic aneurysm (PDAA). At present, the biomechanical mechanism leading to the expansion of the FL is not clear, resulting in difficulties in its prevention and treatment. This paper presents a patient-specific one-way fluid-structure interaction (FSI) method for post-TEVAR TBAD patients. This method was then employed to predict the hemodynamic parameters and wall stress in five unstable and five stable patients post-TEVAR. Simulation results were employed to identify the characteristic mechanical parameters for the FL expansion, and to propose a possible mechanism behind FL expansion involving the relationship between the aortic morphology and the characteristic parameters. The pressure difference between false and true lumen, and the average wall stress of FL are recognized as the characteristic parameters for FL expansion, which effectively differentiate the two groups. The threshold value of wall stress between the two groups is about 75 kPa. Abnormally high luminal pressure difference and wall stress in the unstable group were attributed to their anatomical features, such as: enlarged FL, compressed TL, elevated thrombus ratio in FL, and significantly larger tear size. In conclusion, post-TEVAR expansion of the FL is correlated to high luminal pressure difference and elevated FL wall stress, which might be caused by the morphological features of the aorta.

关键词： Aortic dissection TEVAR fluid-structure interaction Hemodynamics Structural stress

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Interface adapted LBB-stable finite elements on fluid structure interaction problems in fully Eulerian framework

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APPLIED NUMERICAL MATHEMATICS 2021年 162卷 283-300页

作者： Asok, Harshin Kamal Tripura Inst Technol Mech Engn Dept Agartala 799009 India

In this article, we implement and analyze a locally modified parametric finite element method for fluid structure interaction problems using LBB-stable finite elements. The variational formulation of the monolithically coupled fluid structure interaction problems is solved using a fully Eulerian framework. A combination of Q(2)-Q(2)-(Q(1)+Q(0)(dc)) and P-2-P-2-(P-1+P-0(dc*)) finite elements are used to approximate the globally defined velocity displacement-pressure fields. The edges of the grid cells through which interface is passing, are re-aligned to ensure that interface geometry is captured by the grid efficiently. Values of degrees of freedom corresponding to nodes belonging to such cells are updated using Galerkin projection. The numerical simulation results of the new framework were found to be in good agreement with standard benchmark problem data and reference values. The finite element framework was also extended and tested for adaptive grid refinement. (C) 2021 IMACS. Published by Elsevier B.V. All rights reserved.

关键词： Locally modified finite elements fluid-structure interaction Monolithic formulation Fully Eulerian LBB-stable Adaptive finite elements

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Refactorization of Cauchy's Method: A Second-Order Partitioned Method for fluid-Thick structure interaction Problems

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JOURNAL OF MATHEMATICAL fluid MECHANICS 2021年第3期23卷 1-25页

作者： Bukac, Martina Seboldt, Anyastassia Trenchea, Catalin Univ Notre Dame Dept Appl & Computat Math & Stat Notre Dame IN 46556 USA Univ Pittsburgh Dept Math Pittsburgh PA 15260 USA

This work focuses on the derivation and the analysis of a novel, strongly-coupled partitioned method for fluid-structure interaction problems. The flow is assumed to be viscous and incompressible, and the structure is modeled using linear elastodynamics equations. We assume that the structure is thick, i.e., modeled using the same number of spatial dimensions as fluid. Our newly developed numerical method is based on Robin boundary conditions, as well as on the refactorization of the Cauchy's one-legged 'theta-like' method, written as a sequence of Backward Euler-Forward Euler steps used to discretize the problem in time. This family of methods, parametrized by theta, is B-stable for any theta is an element of[12,1] and second-order accurate for theta=12+O(tau), where tau is the time step. In the proposed algorithm, the fluid and structure sub-problems, discretized using the Backward Euler scheme, are first solved iteratively until convergence. Then, the variables are linearly extrapolated, equivalent to solving Forward Euler problems. We prove that the iterative procedure is convergent, and that the proposed method is stable provided theta is an element of[12,1]. Numerical examples, based on the finite element discretization in space, explore convergence rates using different values of parameters in the problem, and compare our method to other strongly-coupled partitioned schemes from the literature. We also compare our method to both a monolithic and a non-iterative partitioned solver on a benchmark problem with parameters within the physiological range of blood flow, obtaining an excellent agreement with the monolithic scheme.

关键词： fluid-structure interaction Partitioned scheme Second-order convergence Strongly-coupled

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Rigorous Derivation of a Linear Sixth-Order Thin-Film Equation as a Reduced Model for Thin fluid-Thin structure interaction Problems

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APPLIED MATHEMATICS AND OPTIMIZATION 2021年第2期84卷 2245-2288页

作者： Bukal, Mario Muha, Boris Univ Zagreb Fac Elect Engn & Comp Unska 3 Zagreb 10000 Croatia Univ Zagreb Fac Sci Dept Math Bijenicka Cesta 30 Zagreb 10000 Croatia

We analyze a linear 3D/3D fluid-structure interaction problem between a thin layer of a viscous fluid and a thin elastic plate-like structure with the aim of deriving a simplified reduced model. Based on suitable energy dissipation inequalities quantified in terms of two small parameters, thickness of the fluid layer and thickness of the elastic structure, we identify the right relation between the system coefficients and small parameters which eventually provide a reduced model on the vanishing limit. The reduced model is a linear sixth-order thin-film equation describing the out-of-plane displacement of the structure, which is justified in terms of weak convergence results relating its solution to the solutions of the original fluid-structure interaction problem. Furthermore, approximate solutions to the fluid-structure interaction problem are reconstructed from the reduced model and quantitative error estimates are obtained, which provide even strong convergence results.

关键词： Thin viscous fluids Elastic plate fluid-structure interaction Linear sixth-order thin-film equation Error estimates

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SEMI-IMPLICIT EULERIAN METHOD FOR THE fluid structure interaction OF ELASTIC MEMBRANES

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SIAM JOURNAL ON SCIENTIFIC COMPUTING 2025年第3期47卷 A1555-A1578页

作者： Ciallella, Mirco Milcent, Thomas Univ Paris Cite Lab Jacques Louis Lions Paris France Ecole Natl Super Arts & Metiers Inst Mecan & Ingn F-33400 Talence France

In this paper we propose a novel and general approach to design semi-implicit methods for the simulation of fluid-structure interaction problems in a fully Eulerian framework. Herein, we focus on the two-dimensional version of the general model of full membrane elasticity consists in treating the elastic source term by writing an evolution equation on the structure stress tensor, even if it is nonlinear. Then, the semi-implicit treatment allows us to add to the linear system, arising from the discretization of the fluid-structure problem, some consistent dissipation terms that depend on the local deformation and stiffness of the membrane and stabilize the method. Due to the linearly implicit discretization, the approach does not need iterative solvers and can be easily applied to any Eulerian framework for fluid-structure interaction. Its stability properties are studied by performing a Von Neumann analysis on a simplified one-dimensional model and proving that, thanks to the additional dissipation, the discretized coupled system is unconditionally stable. Several numerical experiments are shown for two-dimensional problems by comparing the new method to the original explicit scheme and studying the effect of structure stiffness and mesh refinement on the membrane dynamics. The newly designed scheme is able to relax the time step restrictions that affect the explicit method and reduce crucially the computational costs, especially when very stiff membranes are under consideration.

关键词： Eulerian elasticity fluid-structure interaction semi-implicit immersed boundary incompressible Navier--Stokes

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On the coupling of a direct-forcing immersed boundary method and the regularized lattice Boltzmann method for fluid-structure interaction

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COMPUTERS & fluidS 2019年 190卷 470-484页

作者： Li, Zhe Cao, Wenjin Le Touze, David Ecole Cent Nantes LHEEA Res Dept ECN Nantes France CNRS Nantes France

The present paper provides an analysis of the force model effect on the regularization procedure based on the Hermite expansion in regularized lattice Boltzmann method (RLBM). It is shown that, when using the 2nd-order accurate in time semi-implicit force model of Guo et al. [15] in RLBM, the reconstruction of the non-equilibrium part of the distribution function has to start from the 1st-order Hermite polynomial, because the new distribution function (after a change of variables) contains the body force effect. Based on this Hermite regularization, an immersed boundary-regularized lattice Boltzmann (IB-RLB) coupling method is proposed for simulating transient fluid-structure interactions (FSI) with rigid and deformable solid objects. The fluid and solid solvers are coupled in a non-staggered way so that the stability and accuracy are well preserved. The proposed IB-RLB coupling method is then validated with several numerical test-cases, such as impulsively started plate, vortex-induced vibrations and 3D flapping flag, for which good agreements are found with the references. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Immersed boundary method Regularized lattice Boltzmann method Force model

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A review of fluid-structure interaction: blood flow in arteries

Biomedical Engineering Advances

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Biomedical Engineering Advances 2025年 9卷

作者： Zubeir Allum Saib Farid Abed Mergen H. Ghayesh Marco Amabili Biomedical Engineering Graduate Program American University of Sharjah Sharjah United Arab Emirates Department of Bioengineering New York University Abu Dhabi Abu Dhabi United Arab Emirates Department of Civil Engineering American University of Sharjah Sharjah United Arab Emirates School of Electrical and Mechanical Engineering University of Adelaide South Australia Australia School of Engineering Westlake University Hangzhou Zhejiang province China

Over the past decade, fluid-structure interaction studies related to blood vessels have been an active area of research, as they adequately capture the multiphysics of blood flow within the circulatory system. Despite the growing interest, only few state-of-the-art reviews have been published in the literature, each focusing individually on the coronary artery, carotid artery, aorta, heart valves and peripheral arteries. This systematic review assesses the current research and implications of fluid-structure interaction implementation strategies in relation to human arteries. It is meant to comprehensively amalgamate research studies on an array of arteries coupled with cardiovascular complications such as atherosclerosis, plaque calcification, aneurysms, aortic dissections and valve dysfunction. It additionally covers computational finite element and finite volume solver demands, coupling schemes, inlet and outlet boundary conditions specifications, Newtonian and non-Newtonian blood rheological properties, laminar and turbulent flow types, as well as the modelling of the vessel wall’s hyperelastic and viscoelastic mechanical behavior. The research information is retrieved from the last ten years and summarized in a tabulated format, to help researchers in easily extracting useful information for future investigations and reviews.

关键词： fluid-structure interaction Computational fluid dynamics Finite element analysis Blood flow Hemodynamics Biomechanics Atherosclerosis Aneurysm Calcification Artery Plaque Valve

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