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Study on free vibration response of a liquid retaining composite structure considering fluid-wall interaction

INNOVATIVE INFRAstructure SOLUTIONS 2023年第9期8卷 1-14页

作者： Saha, Prithwish Mandal, Kalyan Kumar Heritage Inst Technol Dept Civil Engn Kolkata 700107 West Bengal India Jadavpur Univ Dept Civil Engn Kolkata 700032 West Bengal India

Free vibration response of composite side walls of liquid retaining tank is carried out in the present study using direct coupling method. Graphite-epoxy side walls are modelled using eight noded isoparametric element with five degrees of freedom per node. The fluid inside the reservoir is modelled with sixteen noded brick element. First-order shear deformation theory (FSDT) is employed to obtain the strain terms of the thin plate with proper shear correction factor. Plate and fluid are modelled separately in Matlab environment and then coupled in a direct way to obtain the vibration response of the side walls considering the effect of fluid-structure interaction (FSI). Influence of parametric variations in terms of ply angle, ply layers (number and thickness), stacking sequence, tank geometry and boundary conditions are considered and respective responses are presented graphically with several numerical examples. Convective wave propagation is more predominant in the second frequency of the fluid;hence, the first three natural frequencies are studied in depth to represent the actual free vibration response. Outcome of the present study shows that frequency values increase with increase in ply angle though symmetric 45 & DEG;2 layered lamination shows peak values among all the cross-ply or angle-ply variations. Height of the tank wall is also a guiding factor for frequency as it increases up to a ratio (height/length) of 0.5. Variation in boundary conditions reveals that tank with all edges simply supported for both the side walls has maximum frequency. Effect of convective wave response is also observed with the results associated with second frequency values. Mode shapes of the plate under different boundary conditions are also presented at the end.

关键词： fluid-structure interaction Finite element method Composite plate Free vibration analysis Direct coupling Mode shape

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Dynamic Adaptive Finite Element Analysis of Acoustic Wave Propagation Due to Underwater Explosion for fluid-structure interaction Problems

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Journal of Marine Science and Application 2015年第3期14卷 302-315页

作者： Seyed Shahab Emamzadeh Mohammad Taghi Ahmadi Soheil Mohammadi Masoud Biglarkhani Islamic Azad University Kangan Branch Kangan *** Iran Department of Civil Engineering Tarbiat Modares University Tehran 14115-143 Iran School of Civil Engineering University of Tehran Tehran 4563-11155 Iran Department of Civil Engineering University of Hormozgan Hormozgan 3995 Iran

In this paper, an investigation into the propagation of far field explosion waves in water and their effects on nearby structures are carried out. For the far field structure, the motion of the fluid surrounding the structure may be assumed small, allowing linearization of the governing fluid equations. A complete analysis of the problem must involve simultaneous solution of the dynamic response of the structure and the propagation of explosion wave in the surrounding fluid. In this study, a dynamic adaptive finite element procedure is proposed. Its application to the solution of a 2D fluid-structure interaction is investigated in the time domain. The research includes：a） calculation of the far-field scatter wave due to underwater explosion including solution of the time-depended acoustic wave equation, b） fluid-structure interaction analysis using coupled Euler-Lagrangian approach, and c） adaptive finite element procedures employing error estimates, and re-meshing. The temporal mesh adaptation is achieved by local regeneration of the grid using a time-dependent error indicator based on curvature of pressure function. As a result, the overall response is better predicted by a moving mesh than an equivalent uniform mesh. In addition, the cost of computation for large problems is reduced while the accuracy is improved.

关键词： adaptive mesh fluid-structure interaction acoustic wave finite element analysis underwater explosion

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fluid-structure interaction MODELLING PREDICTS THAT STRAIN TRANSFER THROUGH FOCAL ATTACHMENTS OF OSTEOBLAST CELLS ARE THE PRIMARY MEDIATORS OF MECHANICAL STIMULATION UNDER fluid FLOW

FLUID-STRUCTURE INTERACTION MODELLING PREDICTS THAT STRAIN T...

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15th American-Society-Mechanical-Engineering Summer Bioengineering Conference (SBC2013)

作者： Vaughan, T. J. Haugh, M. G. McNamara, L. M. Natl Univ Ireland NCBES Ctr Biomech Res BMEC Mech & Biomed Engn Galway Ireland

ISBN: (纸本)9780791855607

Bone continuously adapts its internal structure to accommodate the functional demands of its mechanical environment. It has been proposed that indirect strain-induced flow of interstitial fluid surrounding bone cells may be the primary mediator of mechanical stimuli in-vivo [1]. Due to the practical difficulties in ascertaining whether interstitial fluid flow is indeed the primary mediator of mechanical stimuli in the in vivo environment, much of the evidence supporting this theory has been established through in vitro investigations that have observed cellular activity in response to fluid flow imposed by perfusion chambers [2]. While such in vitro experiments have identified key mechanisms involved in the mechanotransduction process, the exact mechanical stimulus being imparted to cells within a monolayer is unknown [3]. Furthermoreit is not clear whether the mechanical stimulation is comparable between different experimental systems or, more importantly, is representative of physiological loading conditions experienced by bone cells in vivo. Parallel plate flow chamber (PPFC) systems have been used extensively for in vitro investigations of bone cell mechanotransduction. To date, the main design criteria associated with PPFCs has been to establish a suitable homogeneous wall shear stress (WSS) profile in the region where cultured cells are located [4]. In general, shear stresses of τ_w > 0.6Pa have been used to stimulate an osteogenic response in bone cells. However, it has been recently shown that the operating pressures of some PPFC systems (which may be in excess of 1kPa) are actually sufficient to stimulate a biochemical response in primary osteoblasts in a purely hydrostatic setting [3]. Furthermore, the mechanoreceptor that mediates the mechanical stimulus is not known but several mechanisms have been proposed to initiate a biochemical response, such as integrin attachments [5], stretch-activated channels on the cell membrane [6] or primary cilia [7]. In th

关键词： fluid-structure interaction PRIMARY MEDIATORS MECHANICAL STIMULATION fluid flow mechanical stimulation Bone Cell Mechanical stimuli fluid-solid interactions Cells Mechanical Stimulation Interstitial fluid mechanical environment THROUGH internal structure

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Turbulent fluid-structure interaction of water-entry/exit of a rotating circular cylinder using SPH method

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INTERNATIONAL JOURNAL OF MODERN PHYSICS C 2015年第8期26卷 1550088-1550088页

作者： Ghazanfarian, Jafar Saghatchi, Roozbeh Gorji-Bandpy, Mofid Univ Zanjan Fac Engn Dept Mech Engn Zanjan Iran Amirkabir Univ Technol Address Dept Mech Engn Tehran Iran Babol Univ Technol Dept Mech Engn Babol Sar Iran

This paper studies the two-dimensional (2D) water-entry and exit of a rotating circular cylinder using the Sub-Particle Scale (SPS) turbulence model of a Lagrangian particle-based Smoothed-Particle Hydrodynamics (SPH) method. The full Navier-Stokes (NS) equations along with the continuity have been solved as the governing equations of the problem. The accuracy of the numerical code is veri fled using the case of water-entry and exit of a nonrotating circular cylinder. The numerical simulations of water-entry and exit of the rotating circular cylinder are performed at Froude numbers of 2, 5, 8, and specific gravities of 0.25, 0.5, 0.75, 1, 1.75, rotating at the dimensionless rates of 0, 0.25, 0.5, 0.75. The effect of governing parameters and vortex shedding behind the cylinder on the trajectory curves, velocity components in the flow field, and the deformation of free surface for both cases have been investigated in detail. It is seen that the rotation has a great effect on the curvature of the trajectory path and velocity components in water-entry and exit cases due to the interaction of imposed lift and drag forces with the inertia force.

关键词： Rotating circular cylinder smoothed-particle hydrodynamics method turbulence modeling water-entry and exit fluid-structure interaction

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fluid-structure interaction in Arteries with a Poroelastic Wall Model 21

Fluid-Structure Interaction in Arteries with a Poroelastic W...

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21th Iranian Conference on Biomedical Engineering

作者： Zakerzadeh, Rana Zunino, Paolo Univ Pittsburgh Dept Mech Engn & Mat Sci Pittsburgh PA 15260 USA

ISBN: (纸本)9781479974184

the objective of this work is modeling the interaction between pulsatile blood flow and arterial walls. We model blood flow in arteries as an incompressible viscous fluid with Newtonian rheology, confined by a poroelastic arterial wall modeled with the Biot equations. We propose loosely coupled solution strategy of the fluid-structure interaction problem, which allows solving the Navier-Stokes and Biot equations separately. In this way, we uncouple the original problem into two parts defined on separate subregions. At the end, the partitioned scheme is exploited as a preconditioner for the monolithic method, leading to a more accurate calculation of the numerical solution. The theoretical results are complemented by numerical simulations.

关键词： fluid-structure interaction Nitsche's method poroelascticity preconditioning

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fluid-structure interaction Simulation of Wind Turbine 3

Fluid-structure Interaction Simulation of Wind Turbine

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3rd International Conference on Mechatronics and Control Engineering (ICMCE)

作者： Lin, Donglong Pang, Zhao Zhang, Kexin You, Shuang Jilin Univ Coll Mech Sci & Engn Changchun 130022 Peoples R China Jilin Univ Coll Mech Sci & Engn Changchun 130022 Peoples R China Shanghai Transmiss Ltd Co Shanghai 201822 Peoples R China Jilin Univ Coll Mech Sci & Engn Changchun 130022 Peoples R China

ISBN: (纸本)9783038352914

The model of wind turbine was created by CATIA software, and then the simulation for blades and wind field was conducted by ANSYS software. The phenomena, such as tip vortex of blade, center vortex, and spiral trailing edge vortex caused by the rotating wind turbine, were presented explicitly and the pressure distribution of wind field was obtained. This paper provides some guiding significance to the arrangement of wind turbine and the studies about loading, deformation, and stress of blades.

关键词： Wind turbine Blades fluid-structure interaction

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A fluid-structure interaction Analysis of the Spring-Loaded Pressure Safety Valve during Popping Off

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Procedia Engineering 2015年 130卷 87-94页

作者： X.G. Song L.T. Wang Y.C. Park W. Sun School of Mechanical Engineering Dalian University of Technology Dalian 116024 China School of Mechanical Engineering Dong-A University Busan 604-714 South Korea

Many industrial engineering problems require fluid-structure interaction (FSI) analysis and dynamics analysis to improve functionality or operational performance. One such problem is the popping off of pressure safety valve (PSV) widely used in pressure vessels and pipes. Popping off of a spring-loaded pressure safety valve (PSV) is crucial to prevent the pressure vessel or pipe from overpressure. It's difficult to observe the dynamics of the valve disc as well as the flow characteristics through the small chamber between the valve disc and valve seat over such a remarkable short period in the past. To address this issue, a transient computational fluid dynamics (CFD) model with moving grid technique has been presented in this work. Fine structure grid has been generated over the whole flow domain to ensure that the valve disc can move freely and continuously without negative volume problem. Two types of time-dependent overpressure are given to simulate the popping of the PSV under different overpressure conditions. Response parameters such as the displacement of the disc, fluid force on the disc and the blowdown value are monitored to see their influence on the popping of the valve. The results are helpful to improve the popping action of the valve in design stage, and demonstrate the availability and efficiency of using transient CFD simulation in the popping analysis of spring-loaded PSV.

关键词： Pressure safety valve fluid-structure interaction Popping Off CFD Transient analysis Moving Grid

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IVUS-based fluid-structure interaction Models for Novel Plaque Vulnerability Indices: A Study in Patients with Coronary Artery Disease

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Procedia Engineering 2015年 126卷 436-440页

作者： Liang Wang Akiko Meahara Chun Yang Jie Zheng Richard Bach David Muccigrosso Gary S. Mintz Dalin Tang Mathematical Sciences Department Worcester Polytechnic Institute Worcester MA 01609 USA Columbia University The Cardiovascular Research Foundation NY 10022 USA Network Technology Research Institue China United Network Communications Co. Ltd. Beijing 100048 China Mallinckrodt Institute of Radiology Washington University St. Louis MO 63110 USA Cardiovascular Division Washington University School of Medicine St. Louis MO 63110 USA Southeast University Nanjing 210096 China

It is believed that mechanical stresses play an important role in atherosclerotic plaque rupture process and may be used for better plaque vulnerability assessment and rupture risk predictions. IVUS data were acquired from 14 patients (11 M, 3F, Mean age: 59,) for constructing 3D computational models combining fluid-structure interaction (FSI), cyclic bending due to cardiac contraction and patient-specific pressure loading to quantify mechanical conditions in the human coronary. The computational models were solved by a finite element package ADINA to obtain plaque wall stress (PWS), strain (PWSn) and flow shear stress (FSS) and investigate correlation between the mechanical conditions and morphological characteristics. For all 617 IVUS slices yielded from the 14 patients, plaque morphological features lipid percentage and min cap thickness were calculated for each slice, and three types of plaque morphology related indices: lipid index, cap index and morphological index (MPVI) were introduced as quantitative measures of plaque vulnerability. PWS, PWSn and FSS values at critical sites were denoted as critical plaque wall stress (CPWS), critical plaque wall strain (CPWSn) and critical flow shear stress (CFSS) for each slice, and a stress index was proposed based on the value of the CPWS. The conventional Pearson's correlation is used to analyze the correlation between each of the mechanical conditions and each plaque morphological feature indices. Our results suggest there is significant correlation between the CPWS and min cap thickness, cap index with the correlation coefficient r=-0.6570, r=0.8016 respectively, while the correlation between CPWS and lipid percentage and the lipid index are weaker (r=0.2209, r=0.2304) even though they are significantly correlated. The correlation results between CPWS and morphological index (r=0.7725, p-value<0.0001) showed there is a strong positive relationship between the mechanical stress and morphological features. For all 6

关键词： Coronary plaque morphological index fluid-structure interaction plaque rupture plaque progression IVUS

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A simplified mechanical model with fluid-structure interaction for rectangular tank sloshing under horizontal excitation

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ADVANCES IN MECHANICAL ENGINEERING 2015年第5期7卷 1-16页

作者： Zou, Changfang Wang, Deyu Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai 200240 Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explor Shanghai Peoples R China

Based on the spring-mass model, a novel mechanical model of sloshing with fluid-structure interaction under a horizontal excitation is proposed, and the coupled dynamic equation of sloshing system is established. Considering the flexibility of bulkhead, the effects of certain factors, such as bulkhead bending stiffness and filling ratios, on the mode of coupled sloshing system are investigated. It is found that these factors have significant influence on the mode. By comparing the present results with the results of ADINA based on the linear potential flow theory and published literatures, the proposed coupled sloshing model is verified. The results show that the simplified rigid mass, m(0), dominates the contributions to bending moment near the bottom of a bulkhead and the spring-mass, m(1), k(1) to bending moment near the liquid-free surface of a bulkhead. Furthermore, the computational cost is greatly reduced by using the proposed mechanical model with fluid-structure interaction for a rectangular tank sloshing.

关键词： Sloshing fluid-structure interaction spring-mass model water wave mode coupling effect

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Coupled Analysis of fluid-structure interaction of a Micro-Mechanical Valve for Glaucoma Drainage Devices

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KLINISCHE MONATSBLATTER FUR AUGENHEILKUNDE 2015年第12期232卷 1374-1380页

作者： Siewert, S. Saemann, M. Schmidt, W. Stiehm, M. Falke, K. Grabow, N. Guthoff, R. Schmitz, K. -P. Univ Med Rostock Inst Biomed Tech D-18119 Rostock Germany Univ Med Rostock Klin & Poliklin Augenheilkunde D-18119 Rostock Germany

Background: Glaucoma is the leading cause of irreversible blindness worldwide. In therapeutically refractory cases, alloplastic glaucoma drainage devices ( GDD) are being increasingly used to decrease intraocular pressure. Current devices are mainly limited by fibrotic encapsulation and postoperative hypotension. Preliminary studies have described the development of a glaucoma microstent to control aqueous humour drainage from the anterior chamber into the suprachoroidal space. One focus of these studies was on the design of a micro- mechanical valve placed in the anterior chamber to inhibit postoperative hypotension. The present report describes the coupled analysis of fluid- structure interaction ( FSI) as basis for future improvements in the design micromechanical valves. Materials and Methods: FSI analysis was carried out with ANSYS 14.5 software. Solid and fluid geometry were combined in a model, and the corresponding material properties of silicone ( Silastic Rx- 50) and water at room temperature were assigned. The meshing of the solid and fluid domains was carried out in accordance with the results of a convergence study with tetrahedron elements. Structural and fluid mechanical boundary conditions completed the model. The FSI analysis takes into account geometric non- linearity and adaptive remeshing to consider changing geometry. Results: A valve opening pressure of 3.26mmHg was derived from the FSI analysis and correlates well with the results of preliminary experimental fluid mechanical studies. Flow resistance was calculated from non- linear pressure- flow characteristics as 8.5 x 10- 3 mmHg/ mu l center dot min- 1 and 2.7 x 10- 3 mmHg/ mu l center dot min- 1, respectively before and after valve opening pressure is exceeded. FSI analysis indicated leakage flow before valve opening, which is due to the simplified model geometry. Conclusions: The presented bidirectional coupled FSI analysis is a powerful tool for the development of new designs ofmicro- mec

关键词： glaucoma drainage device microvalve numerical simulation fluid-structure interaction

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