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A Reduced-Order Flow Model for fluid-structure interaction Simulation of Vocal Fold Vibration

JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME 2020年第2期142卷 6-6页

作者： Li, Zheng Chen, Ye Chang, Siyuan Luo, Haoxiang Vanderbilt Univ Dept Mech Engn 2301 Vanderbilt Pl Nashville TN 37235 USA

We present a novel reduced-order glottal airflow model that can be coupled with the three-dimensional (3D) solid mechanics model of the vocal fold tissue to simulate the fluid-structure interaction (FSI) during voice production. This type of hybrid FSI models have potential applications in the estimation of the tissue properties that are unknown due to patient variations and/or neuromuscular activities. In this work, the flow is simplified to a one-dimensional (1D) momentum equation-based model incorporating the entrance effect and energy loss in the glottis. The performance of the flow model is assessed using a simplified yet 3D vocal fold configuration. We use the immersed-boundary method-based 3D FSI simulation as a benchmark to evaluate the momentum-based model as well as the Bernoulli-based 1D flow models. The results show that the new model has significantly better performance than the Bernoulli models in terms of prediction about the vocal fold vibration frequency, amplitude, and phase delay. Furthermore, the comparison results are consistent for different medial thicknesses of the vocal fold, subglottal pressures, and tissue material behaviors, indicating that the new model has better robustness than previous reduced-order models.

关键词： vocal fold fluid-structure interaction reduced-order model phonation

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Accurate iteration-free mixed-stabilised formulation for laminar incompressible Navier-Stokes: Applications to fluid-structure interaction

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JOURNAL OF fluidS AND structureS 2020年 97卷 103077-103077页

作者： Kadapa, Chennakesava Dettmer, Wulf G. Peric, Djordje Swansea Univ Swansea Acad Adv Comp Swansea SA1 8EN W Glam Wales Swansea Univ Zienkiewicz Ctr Computat Engn ZCCE Swansea SA1 8EN W Glam Wales

Stabilised mixed velocity-pressure formulations are one of the widely-used finite element schemes for computing the numerical solutions of laminar incompressible Navier-Stokes. In these formulations, the Newton-Raphson scheme is employed to solve the nonlinearity in the convection term. One fundamental issue with this approach is the computational cost incurred in the Newton-Raphson iterations at every load/time step. In this paper, we present an iteration-free mixed finite element formulation for incompressible Navier-Stokes that preserves second-order temporal accuracy of the generalised-alpha and related schemes for both velocity and pressure fields. First, we demonstrate the second-order temporal accuracy using numerical convergence studies for an example with a manufactured solution. Later, we assess the accuracy and the computational benefits of the proposed scheme by studying the benchmark example of flow past a fixed circular cylinder. Towards showcasing the applicability of the proposed technique in a wider context, the inf-sup stable P2-P1 pair for the formulation without stabilisation is also considered. Finally, the resulting benefits of using the proposed scheme for fluid-structure interaction problems are illustrated using two benchmark examples in fluid-flexible structure interaction. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Incompressible Navier-Stokes SUPG/PSPG stabilisation Newton-Raphson scheme fluid-structure interaction

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Computational hemodynamics in arteries with the one-dimensional augmented fluid-structure interaction system: viscoelastic parameters estimation and comparison with in-vivo data

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JOURNAL OF BIOMECHANICS 2020年第0期100卷 109595-000页

作者： Bertaglia, Giulia Navas-Montilla, Adrian Valiani, Alessandro Monge Garcia, Manuel Ignacio Murillo, Javier Caleffi, Valerio Univ Ferrara Dept Engn Via G Saragat 1 I-44122 Ferrara Italy Univ Zaragoza Fluid Mech LIFTEC CSIC Calle Maria de Luna 3 Zaragoza 50018 Spain Hosp SAS Jerez Intens Care Unit Jerez de la Frontera 11407 Spain

Mathematical models are widely recognized as a valuable tool for cardiovascular diagnosis and the study of circulatory diseases, especially to obtain data that require otherwise invasive measurements. To correctly simulate body hemodynamics, the viscoelastic properties of vessels walls are a key aspect to be taken into account as they play an essential role in cardiovascular behavior. The present work aims to apply the augmented fluid-structure interaction system of blood flow to real case studies to assess the validity of the model as a valuable resource to improve cardiovascular diagnostics and the treatment of pathologies. Main contributions of the paper include the evaluation of viscoelastic tube laws, estimation of viscoelastic parameters and comparison of models with literature results and in-vivo experiments. The ability of the model to correctly simulate pulse waveforms in single arterial segments is verified using literature benchmark test cases, designed taking into account a simple elastic behavior of the wall in the upper thoracic aorta and in the common carotid artery. Furthermore, in-vivo pressure waveforms, extracted from tonometric measurements performed on four human common carotid arteries and two common femoral arteries, are compared to numerical solutions. It is highlighted that the viscoelastic damping effect of arterial walls is required to avoid an overestimation of pressure peaks. Finally, an effective procedure to estimate the viscoelastic parameters of the model is herein proposed, which returns hysteresis curves of the common carotid arteries dissipating energy fractions in line with values calculated from literature hysteresis loops in the same vessel. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Blood flow One-dimensional models Arterial hemodynamics Viscoelastic effects fluid-structure interaction

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Three-dimensional fluid-structure interaction simulations of a yarn subjected to the main nozzle flow of an air-jet weaving loom using a Chimera technique

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TEXTILE RESEARCH JOURNAL 2020年第2期90卷 194-212页

作者： Delcour, Lucas Peeters, Jozef Degroote, Joris Univ Ghent Dept Flow Heat & Combust Mech Fac Engn & Architecture Ghent Belgium Picanol NV Ieper Belgium Flanders Make Lommel Belgium

In air-jet weaving looms, the main nozzle pulls the yarn from the prewinder by means of a high velocity air flow. The flexible yarn is excited by the flow and exhibits high amplitude oscillations. The motion of the yarn is important for the reliability and the attainable speed of the insertion. fluid-structure interaction simulations calculate the interaction between the air flow and the yarn motion and could provide additional insight into yarn behavior. However, the use of an arbitrary Lagrangian-Eulerian approach for the deforming fluid domain around a flexible yarn typically results in severe mesh degradation, vastly reducing the accuracy of the calculations or limiting the physical time that can be simulated. In this research, the feasibility of using a Chimera technique to simulate the motion of a yarn interacting with the air flow from a main nozzle was investigated. This methodology combines a fixed background grid with a moving component grid deforming along with the yarn. The component grid is, however, not constrained by the boundaries of the flow domain allowing for large deformations with limited mesh degradation. Two separate cases were investigated. In the first case, the yarn was considered to be clamped at the main nozzle inlet. For the second case, the yarn was allowed to move axially as the main nozzle pulled it from a drum storage system.

关键词： weft yarn insertion main nozzle fluid-structure interaction dynamic mesh Chimera overset

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interaction of a deformable solid with two-phase flows: An Eulerian-based numerical model for fluid-structure interaction using the level contour reconstruction method

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2020年第11期92卷 1478-1505页

作者： Shin, Seungwon Chergui, Jalel Juric, Damir Hongik Univ Dept Mech & Syst Design Engn Sangsu Dong 72-1 Seoul 121791 South Korea Univ Paris Saclay CNRS LIMSI Orsay France

We describe the formulation of a method for fluid-structure interaction involving the coupling of moving and/or flexible solid structures with multiphase flows in the framework of the Level Contour Reconstruction Method. We present an Eulerian-based numerical procedure for tracking the motion and interaction of a liquid-gas interface with a fluid-solid interface in the Lagrangian frame together with the evaluation of the fluid transport equations coupled to those for the solid transport, namely the left Cauchy-Green strain tensor field, in the Eulerian frame. To prevent excessive dissipation due to the convective nature of the solid transport equation, a simple incompressibility constraint for the strain field is enforced. A single grid structure is used for both the fluid and solid phases which allows for a simple and natural coupling of the fluid and solid dynamics. Several benchmark tests are performed to show the accuracy of the numerical method and which demonstrate accurate results compared to several of those in the existing literature. In particular we show that surface tension effects including contact line dynamics on the deforming solid phase can be properly simulated. The three-phase interaction of a droplet impacting on a flexible cantilever is investigated in detail. The simulations follow the detailed motion of the droplet impact (and subsequent deformation, breakup, and fall trajectory) along with the motion of the deformable solid cantilever due to its own weight as well as due to the force of the droplet impact.

关键词： Eulerian-based formulation fluid-structure interaction front-tracking method multiphase flow numerical simulation solid stress

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A weakly compressible hybridizable discontinuous Galerkin formulation for fluid-structure interaction problems

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2020年 372卷 113392-113392页

作者： La Spina, Andrea Kronbichler, Martin Giacomini, Matteo Wall, Wolfgang A. Huerta, Antonio Tech Univ Munchen TUM Lehrstuhl Numer Mech LNM Garching Germany Univ Politecn Catalunya UPC Lab Calcul Numer LaCaN Barcelona Spain Ctr Int Metodes Numer Engn CIMNE Barcelona Spain

A scheme for the solution of fluid-structure interaction (FSI) problems with weakly compressible flows is proposed in this work. A novel hybridizable discontinuous Galerkin (HDG) method is derived for the discretization of the fluid equations, while the standard continuous Galerkin (CG) approach is adopted for the structural problem. The chosen HDG solver combines robustness of discontinuous Galerkin (DG) approaches in advection-dominated flows with higher-order accuracy and efficient implementations. Two coupling strategies are examined in this contribution, namely a partitioned Dirichlet-Neumann scheme in the context of hybrid HDG-CG discretizations and a monolithic approach based on Nitsche's method, exploiting the definition of the numerical flux and the trace of the solution to impose the coupling conditions. Numerical experiments show optimal convergence of the HDG and CG primal and mixed variables and superconvergence of the postprocessed fluid velocity. The robustness and the efficiency of the proposed weakly compressible formulation, in comparison to a fully incompressible one, are also highlighted on a selection of two and three dimensional FSI benchmark problems. (C) 2020 ElsevierB.V. All rights reserved.

关键词： fluid-structure interaction Finite elements Hybridizable discontinuous Galerkin Weakly compressible flows Navier-Stokes equations Nitsche's method

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An efficient computational model for fluid-structure interaction in application to large overall motion of wind turbine with flexible blades

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APPLIED MATHEMATICAL MODELLING 2020年第Part1期77卷 392-407页

作者： Boujleben, Abir Ibrahimbegovic, Adnan Lefrancois, Emmanuel Sorbonne Univ Univ Technol Compiegne Chair Computat Mech Lab Roberval Mecan F-60205 Compiegne France

This paper proposes a very efficient computational model for fluid-structure interaction problems corresponding to steady-state flow representing a large overall motion of wind turbines with flexible blades. The model of turbine blades is based upon the 3D solids finite elements with drilling rotations. The proposed 3D solids model is fully able to describe the flexibility blades large overall motion and easily capture both bending and torsional motion thanks to using an enhanced strain field. The model efficiency is further reinforced by using the 3D panel method that fits naturally with proposed 3D solid finite elements for blades. The proposed panel method is the corresponding modification of the potential fluid flow by introducing a vorticity layer at the fluid-structure interface and Bernoulli's conservation momentum equation in order to provide quantification for the blade thrust. The fluid-structure interaction is enforced through an efficient iterative procedure providing on one hand a very fast computation of aerodynamic loads, which is sufficiently accurate for computing the overall thrust on the blade, and on the other hand a sufficiently accurate representation of the stress states suitable for fatigue studies. The proposed computational model performance is illustrated with several numerical simulations, including the practical case of a full-scale NREL 5MW wind turbine. (C) 2019 Elsevier inc. All rights reserved.

关键词： fluid-structure interaction 3D vortex panel method Large overall motion Follower pressure Wind turbine blades

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The effect of the entry and re-entry size in the aortic dissection: a two-way fluid-structure interaction simulation

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2020年第6期19卷 2643-2656页

作者： Keramati, Hamed Birgersson, Erik Ho, Jackie P. Kim, Sangho Chua, Kian Jon Leo, Hwa Liang Natl Univ Singapore NUS Grad Sch Integrat Sci & Engn Singapore Singapore Natl Univ Singapore Dept Biomed Engn Singapore Singapore Natl Univ Singapore Dept Mech Engn Singapore Singapore Natl Univ Singapore Yong Loo Lin Sch Med Dept Cardiac Thorac & Vasc Surg Singapore Singapore Natl Univ Singapore Yong Loo Lin Sch Med Dept Surg Singapore Singapore

Aortic dissection (AD) is one of the most catastrophic cardiovascular diseases. AD occurs when a layer inside the aorta is disrupted and gives rise to the formation of a true lumen and a false lumen. These lumens can be connected through tears in the intimal flap which are known as entries. Despite being known for about two centuries, the effects of many factors on the morbidity and mortality of this disease are still unknown. As the blood interaction with the aorta is crucial in the severity and the progression of the aortic dissection, a biomechanical approach is chosen to investigate the influence of different morphologies on the severity of this disease. Using the finite element method (FEM) and the fluid-structure interaction (FSI) approach, we have evaluated the blood flow characteristics along the diseased aorta, in conjunction with the deformation of the aortic wall. In this study, an idealized geometry of a dissected descending aorta (type B) with two entries has been studied. The values for the diameter of the entry tear were chosen to be 5 mm and 10 mm. Therefore, a total of four conditions were investigated. According to our results, the retrograde flow through the proximal tear is dependent on the size of the distal re-entry and vice versa. Our results revealed that when both entry and re-entry tears are 10 mm in diameter, the flow passes through the true and false lumens with smaller resistance, resulting in a smaller flutter of the intimal flap, and therefore more stable intimal flap. Major oscillation frequencies of 2.5 Hz and 7.4 Hz were observed for the oscillation of the intimal flap, and amplitudes of the waves with higher frequencies were negligible.

关键词： Aortic dissection Entry tear fluid-structure interaction Fluttering Hemodynamics

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fluid-structure-SOIL interaction STUDY FOR NUCLEAR FACILITIES WITH LARGE POOL WATER CONSIDERING NONLINEAR STRUCTURAL BEHAVIOR 31

FLUID-STRUCTURE-SOIL INTERACTION STUDY FOR NUCLEAR FACILITIE...

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31st International Conference on Nuclear Engineering (ICONE) - 24/7 Clean Nuclear Energy - Solution for Global Warming

作者： Sato, Yuki Ghiocel, Dan M. Kataoka, Shunji Morimoto, Yasutomi JGC Corp Yokohama Kanagawa Japan Ghiocel Predict Technol Inc New York NY USA

ISBN: (纸本)9780791888292

This study investigates the effects of the fluid-structure-Soil interaction (FSSI) on the seismic responses of a deeply embedded nuclear facility with large water pools under severe earthquakes. This paper presents new seismic analysis method considering FSSI using 3D FEM for deeply embedded typical RC (Reinforced Concrete) shear wall nuclear buildings. In the new method, the commercial SSI analysis software, ACS SASSI was used with Option AA-F, which treats ANSYS fluid element fluid80 dynamic matrices in ACS SASSI environment. By using the method it was confirmed that large pool water in the building provides significant local deformation of the pool walls, while the effects on other part of the structures are almost negligible from engineering point of view. To investigate more with the structure behavior during severe earthquakes, the nonlinear behavior of the structure was also taken into account with the new FSSI method using ACS SASSI NQA Option NON. To model the RC wall nonlinear behavior, their nonlinear backbone curves (BBCs) were computed using both Japanese and America standards. Then, the nonlinear analysis responses with both standards were compared. It was confirmed that the nonlinear structure behavior produced a visible shift of the ISRS spectral peak responses to the lower frequencies in comparison with the response of linear analysis. Also, although some significant differences of seismic responses were not observed between Japanese standard and American standard, it was confirmed that the differences of formulae in each code were reflected on their seismic responses.

关键词： soil-structure interaction fluid-structure interaction nonlinear analysis RC structure 3D FEM

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Analysis and finite element discretization for optimal control of a linear fluid-structure interaction problem with delay

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IMA JOURNAL OF NUMERICAL ANALYSIS 2020年第1期40卷 140-206页

作者： Peralta, Gilbert Kunisch, Karl Univ Philippines Baguio Dept Math & Comp Sci Governor Pack Rd Baguio 2600 Philippines Karl Franzens Univ Graz Inst Math & Sci Comp Heinrichstr 36 A-8010 Graz Austria Austrian Acad Sci RICAM Inst Altenbergerstr 69 A-4040 Linz Austria

An optimal control problem for a linearized fluid-structure interaction model with a delay term in the structural damping is analyzed. A distributed control acting on the fluid domain, structure domain or both is considered. The necessary optimality conditions are derived both for rough and smooth initial data. A parabolic regularization of the problem and its convergence are investigated. Finite element discretization for the regularized problem and error estimates are provided. Piecewise linear elements with bubble functions for the fluid and a discontinuous Galerkin scheme for the spatial and temporal discretizations are utilized respectively. Numerical experiments illustrating the theoretical results are given.

关键词： fluid-structure interaction delay optimal control space-time finite elements error estimates

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