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Numerical study on aeroelastic behavior of spoiler on low-rise building based on fluid-structure interaction method

JOURNAL OF BUILDING ENGINEERING 2022年 59卷

作者： Gan, Shi Li, Gang Dong, Zhiqian Li, Hongnan Zhao, Mi Dalian Univ Technol Fac Infrastruct Engn Dalian 116024 Liaoning Peoples R China Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing 100124 Peoples R China

Technical mitigation devices have been demonstrated to be efficient for decreasing the peak and mean wind pressures on the roof systems of low-rise buildings through disrupting vortex for-mation. Previous investigations have regarded mitigation devices as rigid bodies and neglected aeroelastic behavior. However, the relatively large uplift force induces small-stiffness mitigation devices vibration and introduces a considerable aeroelastic effect. These effects might result in an increase in negative wind pressure on the building roof and the aeroelastic instability problems of mitigation devices. Therefore, the current study conducted two-way fluid-structure interaction (FSI) numerical simulation for a low-rise flat-roof building with mitigation devices (metal and polymer spoilers) to investigate the influence of the aeroelastic effect of spoiler on the wind pressure on the building roof. The large eddy simulation (LES) method and the finite element analysis (FEA) model are used to solve the flow field and the structural responses of the spoiler, respectively. The computational model and method are verified by comparing the calculation results with previous experimental results and benchmark computational tests. The dynamic response of spoiler, the flow instabilities and the wind pressure on the building roof are analyzed. The influence mechanism of the spoiler vibration on the flow field over the building, the wind pressure on the building roof and the uplift force on the spoiler were revealed considering the influencing factors, including the vibrational amplitude of spoiler and the wind direction. The results show that the aeroelastic effect of spoiler increases the negative wind pressure on the roof, and the larger the vibrational amplitude of spoiler is, the more the negative wind pressure in-creases. The negative wind pressure on the eave also increases with increasing wind direction angle. The main reason for this phenomenon is that the spoiler vibration incr

关键词： Low-rise buildings Wind pressure Mitigation device fluid-structure interaction Aeroelastic behavior

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Coupling of the meshless finite volume particle method and the finite element method for fluid-structure interaction with thin elastic structures

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EUROPEAN JOURNAL OF MECHANICS B-fluidS 2022年 92卷 117-131页

作者： McLoone, Maryrose Quinlan, Nathan J. Natl Univ Ireland Galway Sch Engn Mech Engn Galway Ireland

A novel fluid-structure interaction (FSI) scheme is developed in this article, with the meshless finite volume particle method (FVPM) for fluid dynamics and the finite element (FE) solver FEBio for solid mechanics. Like smoothed particle hydrodynamics (SPH), FVPM is based on compactly supported particle kernels, but kernels are interpreted as a partitioning of volume, leading to a scheme with properties of both SPH and classical finite volume methods. Particle methods are advantageous for fluid modelling in FSI of highly deformable structures, as the particles can conform to the dynamic geometry of the fluid-structure interface. In FVPM, in particular, particles are rigorously truncated by boundaries, and the novel FSI scheme incorporates a sharp interface between the fluid and solid. A new method is described which avoids the possibility of unphysical communication between fluid particles separated by a thin structure. The method proposed here ensures that particles interact with the correct neighbour particles and boundaries, regardless of the particle overlap with the thin structure, allowing for particle size that can be chosen independently of structure thickness. The new method is validated for a hydrostatic water column on an elastic plate, a dam-break with elastic gate, a dam-break with a downstream elastic wall, and a 2-D model of a heart valve leaflet. In the latter two cases, the structure thickness is less than the particle diameter by a factor of up to 16. The results agree well with experimental data from the literature for fluid velocity field and solid deformation. Where quantitative data is available, the numerical results converge with decreasing particle size.(c) 2021 Elsevier Masson SAS. All rights reserved.

关键词： Finite volume particle method Particle method Meshless method fluid-structure interaction Thin structure Finite element method

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Stroke risk evaluation for patients with atrial fibrillation: Insights from left atrial appendage with fluid-structure interaction analysis

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COMPUTERS IN BIOLOGY AND MEDICINE 2022年 148卷 105897-105897页

作者： Fang, Runxin Wang, Zidun Zhao, Xie Wang, Jun Li, Yang Zhang, Yanjuan Chen, Qiang Wang, Jiaqiu Liu, Quanjun Chen, Minglong Li, Zhiyong Southeast Univ Sch Biol Sci & Med Engn Nanjing 210096 Peoples R China Nanjing Med Univ Affiliated Hosp 1 Nanjing 210029 Peoples R China Nanjing Univ Med Sch Affiliated Hosp Nanjing Drum Tower Hosp Nanjing 210008 Peoples R China Southeast Univ Zhongda Hosp Affiliated Hosp Nanjing 210009 Peoples R China Queensland Univ Technol QUT Sch Mech Med & Proc Engn Brisbane Qld 4001 Australia

The majority of cardioembolic strokes in patients with non-valvular atrial fibrillation (NVAF) are resulted from clot formation in the left atrial appendage (LAA). Current stroke risk stratification is based on the overall risks estimated from demographic and clinical profiles but not on individual anatomy or physiology. We aim to explore the differences in LAA morphological and hemodynamic parameters by comparing patients with and without a stroke history. Thirty-nine patients with persistent NVAF were included. Of these, 17 patients without a stroke history (non-stroke group) were compared with 22 patients with a history of stroke (stroke group). Their LAA geometric models were first reconstructed, and the morphological parameters were then measured. Furthermore, their LAA hemodynamic parameters were calculated by fluid-structure interaction analysis. Moreover, particle residual rates (PRR) and blood renewal rates (BRR) analyses were also employed to characterize the thrombogenesis dynamics. The results showed that compared to the non-stroke group, the stroke group had significant smaller LAA tortuosity and LAA orifice area, and significantly lower LAA orifice velocities (0.16 +/- 0.10 vs 0.15 +/- 0.06 cm/s;p = 0.044), but higher PRR (14.58 +/- 9.43 vs 9.25 +/- 4.67;p = 0.040) and BRR (52.41 +/- 18.11 vs 38.36 +/- 24.07;p = 0.044). These LAA morphological and hemodynamic parameters may be used to assess stroke risk in patients with NVAF.

关键词： Atrial fibrillation Stroke risk Left atrial appendage Morphology Hemodynamics fluid-structure interaction

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Comparative study of arterial wall models for numerical fluid-structure interaction simulation of aortic arch aneurysms

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JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2022年第5期44卷 1-14页

作者： Ferreira da Silva, Mario Luis Goncalves, Saulo de Freitas Huebner, Rudolf Univ Fed Minas Gerais Dept Mech Engn Grad Program Mech Engn Antonio Carlos AvePampulha6627 BR-31270901 Belo Horizonte MG Brazil Univ Fed Minas Gerais Dept Mech Engn Antonio Carlos AvePampulha 6627 BR-31270901 Belo Horizonte MG Brazil

The arterial wall model adopted in the fluid-structural numerical simulations is directly related to its mechanical response, as well as to the flow field. The work developed here compares different arterial wall models for an aneurysm located in the aortic arch. Isotropic linear elastic, Yeoh isotropic polynomial hyperelastic, and Holzapfel anisotropic hyperelastic models were used. Physiological boundary conditions were used throughout the cardiac cycle, and the non-Newtonian model of Carreau was used as rheological model. The fluid domain was discretized by the finite volume method, and the solid domain was discretized by the finite element method. The results showed that the less stiff model, i.e., the isotropic linear elastic model with modulus of elasticity E = 1 MPa, had a greater increase in the aneurysmal sac, which favored recirculation and induced low values of wall shear stress, which may be an indication of intraluminal thrombus formation overestimation. However, the peak of maximum principal stress, which occurred at the junction of supra-aortic branches with aortic arch, was higher in the Yeoh model, which may represent an overestimation of the rupture risk in stiffer models.

关键词： Aortic wall model fluid-structure interaction Aortic arch aneurysm Pulsatile blood flow Hemodynamics

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Numerical modeling and development of a dual lung simulator using partitioned fluid-structure interaction approach for ventilator testing

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2022年第7期38卷 e3607-e3607页

作者： Kumar, Rahul Tokas, Sulekh Hadda, Vijay Rakshit, Dibakar Sarkar, Jayati Indian Inst Technol Delhi Dept Chem Engn New Delhi 110016 India All India Inst Med Sci Dept Pulm Crit Care & Sleep Med New Delhi India Indian Inst Technol Delhi Dept Energy Sci & Engn New Delhi 110016 India

New designs of mechanical ventilators require extensive testing before utilizing the ventilator on a patient. Test lungs are commonly used to understand the behavior of new designs of ventilators and the lung mechanics. The current study aims to develop a numerical model of dual test lungs utilizing the partitioned fluid-structure interaction (FSI) approach and test it against the available experimental data of volume-controlled ventilation. Two breathing rates of 12 and 18 bpm were studied at two different tidal volumes of 500 and 600 ml for spontaneous breathing. It is found that with an increase in the compliance (tidal volume/pressure rise) of the lung, the peak pressure rise inside the test lung decreases irrespective of the breathing rate. The maximum average pressure of 44.73, 27.45, and 14 cm H2O is observed for static lung compliances of 10, 21 , and 39 ml/cm H2O, respectively at a tidal volume of 600 ml. Similarly, the maximum von-misses stress was higher (498 kPa) for the lung with lower compliance (10 ml/cm H2O) as compared to the lung with higher compliance (39 ml/cm H2O) at the end of inspiration. This study forms a basis for using computational methods to model simple lung simulators that can effectively investigate the lung mechanics for both spontaneous and ventilated breathing. Thus, it can be utilized as a reference to test novel designs of mechanical ventilators.

关键词： breathing mechanism dual test lungs fluid-structure interaction ventilator

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PROGRESSIVE COLLAPSE BEHAVIOR OF SHIP structureS CONSIDERING fluid-structure interaction EFFECT 42

PROGRESSIVE COLLAPSE BEHAVIOR OF SHIP STRUCTURES CONSIDERING...

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ASME 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Zhou, Ji Pei, Zhiyong Wu, Weiguo Ding, Jianliang Wuhan Univ Technol Wuhan Peoples R China China Merchants Jinling Dingheng Shipbldg Yangzhou Jiangsu Peoples R China

ISBN: (纸本)9780791886847

The collapse behavior of ship structures has great significance to structural safety and reliability design. In the present research, a nonlinear finite element method considering the fluid-structure interaction is proposed to analyze the progressive collapse behavior of a typical container ship test model. The fluid-structure interaction analysis system is constructed adopting STAR-CCM+ and ABAQUS to obtain the moment curvature relationship with time history. The structural collapse response under series wave conditions varying wave length and height is investigated and discussed. The proposed nonlinear analysis considering the fluid-structure interaction can provide a rational way for evaluating the collapse behavior of ship structures in waves. The obtained results have reference for the progressive collapse behavior of ship structures.

关键词： ship structure collapse behavior ultimate strength fluid-structure interaction

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Spline-based space-time finite element approach for fluid-structure interaction with a focus on enclosed domains

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COMPUTERS & MATHEMATICS WITH APPLICATIONS 2022年第0期114卷 210-224页

作者： Make, Michel Spenke, Thomas Hosters, Norbert Behr, Marek Rhein Westfal TH Aachen JARA Ctr Simulat & Data Sci JARA CSD Chair Computat Anal Tech Syst Cats Schinkelstr 2 D-52062 Aachen Germany

Non-Uniform Rational B-Spline (NURBS) surfaces are commonly used within Computer-Aided Design (CAD) tools to represent geometric objects. When using isogeometric analysis (IGA), it is possible to use such NURBS geometries for numerical analysis directly. Analyzing fluid flows, however, requires complex three-dimensional geometries to represent flow domains. Defining a parametrization of such volumetric domains using NURBS can be challenging and is still an ongoing topic in the IGA community. With the recently developed NURBS-enhanced finite element method (NEFEM), the favorable geometric characteristics of NURBS are used within a standard finite element method. This is achieved by enhancing the elements touching the boundary by using the NURBS geometry itself. In the current work, a new variation of NEFEM is introduced, which is suitable for three-dimensional space-time finite element formulations. The proposed method makes use of a new mapping which results in a non-Cartesian formulation suitable for fluid structure interaction (FSI). This is demonstrated by combining the method with an IGA formulation in a strongly-coupled partitioned framework for solving FSI problems. The framework yields a fully spline-based representation of the fluid structure interface through a single NURBS. The coupling conditions at the fluid-structure interface are enforced through a Robin-Neumann type coupling scheme. This scheme is particularly useful when considering incompressible fluids in fully Dirichlet-bounded and curved problems, as it satisfies the incompressibility constraint on the fluid for each step within the coupling procedure. The accuracy and performance of the introduced spline-based space-time finite element approach and its use within the proposed coupled FSI framework are demonstrated using a series of two-and three-dimensional benchmark problems.

关键词： Non-Cartesian NURBS-enhanced finite elements Spline-based methods fluid-structure interaction Exact geometry representation Fully Dirichlet-bounded problems Fully enclosed domains

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Predict Blood Pressure by Photoplethysmogram with the fluid-structure interaction Modeling

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Communications in Computational Physics 2022年第4期31卷 1114-1133页

作者： Jianhong Chen Wenrui Hao Pengtao Sun Lian Zhang Wilshire Advisors LLC Los AngelesCaliforniaUSA Department of Mathematics Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA Department of Mathematical Sciences University of Nevada Las VegasLas VegasNevadaUSA In-Chao Institute Ltd ShenzhenChina

Blood pressure(BP)has been identified as one of the main factors in cardiovascular disease and other related *** how to accurately and conveniently measure BP is important to monitor BP and to prevent *** paper proposes an efficient BP measurement model by integrating a fluid-structure interaction model with the photoplethysmogram(PPG)signal and developing a data-driven computational approach to fit two optimization parameters in the proposedmodel for each *** developed BPmodel has been validated on a public BP dataset and has shown that the average prediction errors among the root mean square error(RMSE),the mean absolute error(MAE),the systolic blood pressure(SBP)error,and the diastolic blood pressure(DBP)error are all below 5mmHg for normal BP,stage I,and stage II hypertension groups,and,prediction accuracies of the SBP and the DBP are around 96%among those three groups.

关键词： Blood pressure prediction fluid-structure interaction PPG

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fluid-structure interaction simulations of the ASPIRE SR01 supersonic parachute flight test

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AEROSPACE SCIENCE AND TECHNOLOGY 2022年 126卷

作者： Boustani, Jonathan Cadieux, Francois Kenway, Gaetan K. Barad, Michael F. Kiris, Cetin C. Brehm, Christoph NASA Ames Res Ctr Computat Aerosci Branch Moffett Field CA 94035 USA Univ Maryland Dept Aerosp Engn College Pk MD 20740 USA

High-fidelity fluid-structure interaction (FSI) simulations of the ASPIRE SR01 supersonic parachute flight test are performed through the loose coupling of computational fluid dynamics (CFD) and computational structural dynamics (CSD) solvers. The CFD solver employs a Cartesian adaptive mesh refinement (AMR) grid paradigm with a ghost cell immersed boundary method to represent arbitrarily complex geometries, and the CSD solver uses MITC3 triangular shell and Timoshenko beam elements to discretize the parachute canopy and suspension lines. The CFD resolution required to capture the deficit of the dynamic pressure in the wake of the ASPIRE payload and the aerodynamic drag on the parachute canopy is systematically studied via grid refinement study before FSI simulations are conducted. FSI simulations presented consider the inflation of an initially folded parachute canopy in freestream conditions matching the line stretch event during the ASPIRE SR01 flight test. The total pull force at the instance of peak loading is predicted to within 10% of the flight test data. The sensitivity of the total pull force and canopy projected area to the grid resolution in the CFD and CSD domains is systematically studied via another grid refinement study, and grid convergence with respect to the CFD domain resolution is demonstrated. The pull force vs time curve predicted by each CFD and CSD grid resolution varies by less than 1% indicating a high degree of repeatability and low grid-related uncertainty. Remaining differences in the qualitative behavior of the pull force curve and quantitative difference in the peak pull force are thus determined to stem from modeling errors such as the lack of deceleration, and different initial parachute and flow states in the FSI simulations compared to the flight test. Published by Elsevier Masson SAS.

关键词： fluid-structure interaction Immersed boundary methods Cartesian grid methods Finite element methods Spacecraft parachutes

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fluid-structure interaction methods for the progressive anatomical and artificial aortic valve stenosis

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INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2022年 227卷

作者： Nowak, Marcin Divo, Eduardo Adamczyk, Wojciech P. Silesian Tech Univ Dept Thermal Technol Konarskiego 22 PL-44100 Gliwice Poland Embry Riddle Aeronaut Univ Mech Engn Dept Orlando FL USA

Cardiovascular system diseases, as aortic valve stenosis, are the main cause of mortality and morbidity among patients. There is still a room for enhancement of the diagnostic and therapeutic procedures, which will lead to improvement of the treatment. One of the remedies are the computer tools to support the medical diagnoses and prostheses design. The development of a procedure for modeling the aortic valves: anatomical tricuspid valve and artificial bileaflet valve, still is a very challenging task. In presented work, the application of the novel, advanced moving mesh model, that consists of the coupling of the dynamic mesh smoothing and the overset mesh technique, to speed up the computation and improve the convergence and stability was shown. The real 2D and 3D vasculature and valve geometries were created based on the echocardiography images available in literature. The calculations of anatomical and artificial valve models were performed for the various severity of the atherosclerosis - not previously published for the bileaflet mechanical valve. The impact of calcification process onto natural and artificial aortic valves was assessed and compared.

关键词： Aortic valve Moving deforming mesh fluid-structure interaction Coronary artery Calcification Virtual therapy

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