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A Novel Three Dimensional fluid-structure interaction Finite Element Model of Wave Propagation in SAW Device: Application to Biosensing & Microfluidics

A Novel Three Dimensional Fluid-Structure Interaction Finite...

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8th IEEE Conference on Sensors

作者： Singh, Reetu Bhethanabotla, Venkat R. Sankaranarayanan, Subramanian K. R. S. Univ S Florida Dept Chem & Biomed Engn Sensors Res Lab Tampa FL 33620 USA Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

ISBN: (纸本)9781424445486

The key issues related to biosensor technology include selectivity, sensitivity, response and recovery times, and detection limit;most of these limitations stem from biofouling resulting from the binding of undesirable moieties such as non-specific proteins to the sensor surface. Thus, removal of non-specifically bound (NSB) proteins remains a significant challenge in biosensing applications. Operation of biosensors in liquid media necessitates an investigation of the fluid-device interaction to understand the mechanisms of biofouling elimination. In this study, we report for the first time, a fully coupled three dimensional transient finite element fluid-solid interaction (FSI) model of the SAW device subject to liquid loading to investigate the streaming velocity fields and forces induced by SAW device. Our simulation results suggest that the SAW-fluid interaction creates a pressure gradient in the direction of acoustic wave propagation in the fluid, leading to an acoustically driven streaming phenomenon known as SAW streaming which can be used for removal of non-specifically bound (NSB) proteins. Computed velocity fields indicate that the normal component of fluid velocity is smaller than the tangential component along the propagation direction. Thus, the SAW induced drag force, arising from the tangential component of fluid velocity and leading to particle advection is an important mechanism in biofouling removal from the SAW device surface and the normal component would prevent the reattachment of the particles to the device surface. Apart from microfluidic applications, this work broadly applies to all transducers used for biological species sensing that suffer from fouling and non-specific binding of protein molecules to the device surface.

关键词： acoustic streaming 3-D fluid-structure interaction biofouling

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Numerical Simulation of fluid-structure interaction for Wind-induced Dynamic Response of Jinan Yellow River Cable-stayed Bridge in Cantilever State

Numerical Simulation of Fluid-Structure Interaction for Wind...

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International Conference on Engineering Computation

作者： Zhou, Ying Zhang, Qi-Lin Liu, Zhen-Hua Tongji Univ Dept Bldg Engn Shanghai 200092 Peoples R China Shandong Univ Sch Civil Engn Jinan Peoples R China

ISBN: (纸本)9780769536552

Long-span bridges are slender, light and flexible large-scale structures. Bridges in the cantilever state are found more susceptible to wind load compared to the bridges in the completed state. The wind-induced dynamic response numerical simulation of fluid-structure interaction of the long span bridge in cantilever state used ADINA is carried out in this paper. The wind-induced dynamic coefficients and the wind pressure distribution coefficients which can he used in the design are also calculated. These analysis provides the evidences for the incremental launching method.

关键词： long-span bridge in the cantilever state numerical simulation incremental launching method wind-induced dynamic response fluid-structure interaction

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On the Acoustic Radiation of Axisymmetric fluid-Filled Pipes Using the Wave Finite Element (WFE) Method

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JOURNAL OF COMPUTATIONAL ACOUSTICS 2015年第3期23卷 1550011-1550011页

作者： Bhuddi, Ajit Gobert, Marie-Laure Mencik, Jean-Mathieu Univ Tours INSA Ctr Val Loire LMR EA 2640 F-41034 Blois France

This paper investigates the efficiency of the wave finite element (WFE) method to assess the vibroacoustic behavior of finite baffled axisymmetric elastic pipes interacting with internal and external acoustic fluids. The pipes, of either homogeneous or multi-layered cross-sections, are surrounded by an external fluid of infinite extent, which can be light or heavy. The Sommerfeld radiation condition is taken into account by considering a perfectly matched layer (PML) around the external fluid. The method involves the computation of waves traveling along an axisymmetric multi-physics waveguide that incorporates a pipe, internal and external fluids, as well as a PML. Numerical experiments are carried out which highlight the relevance of the WFE method in terms of accuracy and CPU time savings, in comparison with the conventional finite element analysis.

关键词： Wave finite element method fluid-structure interaction acoustic radiation perfectly matched layer mid-frequencies

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A scaling aneurysm model-based approach to assessing the role of flow pattern and energy loss in aneurysm rupture prediction

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JOURNAL OF TRANSLATIONAL MEDICINE 2015年第1期13卷 311-311页

作者： Long, Yunling Zhong, Jingru Yu, Hongyu Yan, Huagang Zhuo, Zhizheng Meng, Qianqian Yang, Xinjian Li, Haiyun Capital Med Univ Sch Biomed Engn Dept Biomed Engn Beijing 100069 Peoples R China Beijing Tiantan Hosp Beijing Neurosurg Inst Beijing 100050 Peoples R China

Background and purpose: Energy loss (EL) was regarded to be one of the key parameters in predicting the rupture risk of IA. In this paper, we took varied aspect ratio (AR) as a scaling law to create a series of longitudinal models to investigate the longitudinal changes of flow pattern and EL as the AR varies, in order to explore the relationship between the longitudinal characteristic EL parameters with aneurysm rupture risk. Methods: Seven original intracranial aneurysms (IA) models with similar locations were reconstructed from patient 3D rotational angiography (3DRA) images. Based on these models, a series of scaling aneurysm models with different ARs were created with our proposed scaling algorithms. fluid-solid interaction (FSI) simulations were performed on every model to obtain hemodynamics flow pattern and EL. Results: With AR increasing, flow pattern became more complex, with vortices appearing gradually in the aneurysms (AR > 1.5). Furthermore, the velocity significantly decreased in aneurysms with high ARs (> 1.5). Meanwhile, the aneurysm EL increased with increasing AR. Once AR exceeded 1.5, EL changed drastically. Conclusion: EL was a potential parameter predicting future rupture of unruptured aneurysms. If the EL during the growth of the unruptured aneurysms increased sharply, we strongly recommend an intervention.

关键词： Intracranial aneurysm Aspect ratio Energy loss fluid-structure interaction Flow pattern

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Using 2D in Vivo Ivus-based Models for Human Coronary Plaque Progression Analysis and Comparison with 3d Fsi Models

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Procedia Engineering 2015年 126卷 451-455页

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

It is believed that mechanical stress plays an important role in atherosclerotic plaque progression and rupture process. However, 3D model construction is very time consuming and not practical for clinical implementation. This paper is investigating if 2D models could be used to replace 3D models to perform correlation analysis and achieve similar results. Patient follow-up in vivo intravascular ultrasound coronary plaque data were acquired to construct 2D structure-only and 3D FSI models to obtain plaque wall stress (PWS) and strain (PWSn) data and investigate correlations between plaque progression measured by wall thickness increase(WTI) and three risk factors: wall thickness (WT), PWS and PWSn. Our results indicated that while stress/strain differences between 2D and 3D models were about 30%, correlation results from 2D models were in general consistent with those obtained from 3D models.

关键词： Coronary 2D models fluid-structure interaction plaque rupture plaque progression IVUS

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Numerical Simulation for 1520mm2 Conductor Aeolian Vibration

Numerical Simulation for 1520mm2 Conductor Aeolian Vibration

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2015 International Conference on Applied Mechanics and Mechatronics Engineering(AMME 2015)

作者： Yi QI Chen LIU Kuan-jun ZHU Bin LIU China Electric Power Research Institute North China Electric Power University

This paper studies on the 1520mm large section conductor in view of aeolian vibration. Simplify the aeolian vibration transmission line into two-dimensional dynamic cylindrical model, using Adina for computational fluid dynamics（CFD） simulation to calculate the conductor supported by vertical degree of freedom in transverse flow field, analog the karman vortex street effect in the flow field. Establish aeolian vibration fluid-structure interaction model of single conductor, by numerical simulation we can get the frequency lock-in phenomenon. Based on the research on the response characteristics of aeolian vibration transmission lines, it is practical for the applications of 1520mm large section conductor in engineering.

关键词： 1520mm2 large section conductor Aeolian vibration Computational fluid dynamics fluid-structure interaction

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Structural-acoustic sensitivity analysis for fully coupled system based on FEM discontinuous FMBEM

Structural-acoustic sensitivity analysis for fully coupled s...

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The 5th Asia-Pacific International Conference on Computational Methods in Engineering and the 11th Chinese National Conference on Computational Methods in Engineering(ICOME 2015)

作者： Haibo Chen Leilei Chen CAS Key laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China

Analysis of the acoustic radiation or scattering from elastic structures in heavy fluid is a classical problem of underwater acoustics. Analytical solutions to structural-acoustic interaction problems are available only for simple geometric structures with simple boundary conditions. Analytical solutions to practical problems with complicated geometries remain unavailable. Thus, efficient numerical methods need to be developed. FEM is often used to model the structural parts of the problem because of its high flexibility and applicability to large--scale practical problems. Meanwhile, BEM is used to model the sound field to avoid the need to mesh the acoustic domain which is often infinite or semi-infinite. For the analysis of structural-acoustic interaction problems, researchers have paid much attention on the FEM/BEM coupling approaches, where FEM is used to discretize the structure parts and BEM is used to model the acoustic area. For BEM, the approach of continuous linear and quadratic elements is often applied, and alternatives to discontinuous elements with high accuracy have been previously investigated. Mostly, discontinuous boundary elements were applied when a hypersingular integral was discretized, because, in that case, C1-continuity of the surface at the collocation point is required. The performance of discontinuous boundary elements for the acoustic analysis with rigid structure has also been investigated in detail [1]. However, so far there is no report that describes the performance of discontinuous boundary elements coupled with FEM when the interaction between the structure and the sound field is taken into account. The fast multipole method（FMM） has been applied to accelerate the solution of the integral equation. To solve large-scale practical problems, iterative solvers have been well suited. Thus, the coupling algorithm based on FEM and fast multipole BEM（FMBEM） can be effectively applied to solve large-scale acoustic--structure interaction pr

关键词： Discontinuous boundary element method Finite element method Fast multipole method fluid-structure interaction Sensitivity analysis

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Effects of wing deformation on aerodynamic performance of a revolving insect wing

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Acta Mechanica Sinica 2014年第6期30卷 819-827页

作者： Ryusuke Noda Toshiyuki Nakata Hao Liu Graduate School of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Center (SJTU-CUICRC) Structure and Motion Laboratory The Royal Veterinary CollegeUniversity of London Hawkshead LaneNorth Mymms Hatfield AL9 7TA United Kingdom

Flexible wings of insects and bio-inspired micro air vehicles generally deform remarkably during flapping flight owing to aerodynamic and inertial forces,which is of highly nonlinear fluid-structure interaction（FSI）*** elucidate the novel mechanisms associated with flexible wing aerodynamics in the low Reynolds number regime,we have built up a FSI model of a hawkmoth wing undergoing revolving and made an investigation on the effects of flexible wing deformation on aerodynamic performance of the revolving wing *** take into account the characteristics of flapping wing kinematics we designed a kinematic model for the revolving wing in two-fold：acceleration and steady rotation,which are based on hovering wing kinematics of hawkmoth,Manduca *** results show that both aerodynamic and inertial forces demonstrate a pronounced increase during acceleration phase,which results in a significant wing *** the aerodynamic force turns to reduce after the wing acceleration terminates due to the burst and detachment of leading-edge vortices（LEVs）,the dynamic wing deformation seem to delay the burst of LEVs and hence to augment the aerodynamic force during and even after the *** the phase of steady rotation,the flexible wing model generates more ver-tical force at higher angles of attack（40°–60°）but less horizontal force than those of a rigid wing *** is because the wing twist in spanwise owing to aerodynamic forces results in a reduction in the effective angle of attack at wing tip,which leads to enhancing the aerodynamics performance by increasing the vertical force while reducing the horizontal ***,our results point out the importance of the fluid-structure interaction in evaluating flexible wing aerodynamics：the wing deformation does play a significant role in enhancing the aerodynamic performances but works differently during acceleration and steady rotation,which is mainly induced by inertial force in accelerati

关键词： Insect flight Flexible wing Revolving wing fluid-structure interaction

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Coupled hydroelastic vibrations of an elliptical cylindrical tank with an elastic bottom

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Journal of Hydrodynamics 2014年第2期26卷 264-276页

作者： HASHEMINEJAD Seyyed M. TAFANI Mostafa Acoustics Research Laboratory Center of Excellence in Experimental Solid Mechanics and Dynamics School of Mechanical Engineering Iran University of Science and Technology

An exact three-dimensional analysis based on the linear potential theory and the elaborated method of eigenfunction expansion in elliptic coordinates are presented to study the free coupled elasto-hyrodynamic characteristics of an upright non-deformable cylindrical container of elliptical planform with a flexible bottom plate, filled to an arbitrary depth with an inviscid incompressible liquid. Extensive numerical data are presented in an orderly fashion for the first few symmetric/anti-symmetric coupled hydroelastic natural frequencies as a function of fluid depth parameter for two plate aspect ratios. Also, selected hydrodynamic and structural deformation modes shapes are presented in graphical form. The effects of liquid level, bottom plate elasticity, and cross sectional aspect ratio on the sloshing frequencies and hydrodynamic pressure modes are examined. The validity of the results is examined through computations using a commercial finite element package as well as by comparison with the data available in literature.

关键词： exact solution fluid-structure interaction free surface oscillations vertical elliptical vessel Mathieu functions

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Wind-structure System Modeling Based on Multi Material ALE Method

Wind-Structure System Modeling Based on Multi Material ALE M...

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2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics(AMEII 2015)

作者： Wang Yang Xingman Mo Jian Yang Huixin Wang Shunyu Yao Kerui Wang College of Mechanical Engineering Guangxi University Collaborative innovation center for sugar industry of Guangxi

ISBN: (纸本)9781510806481

Currently,the process of using multi material ALE method to modeling wind-structure system is not specific,and its reliability is unknown. This paper details the process of using multi material ALE method to modeling the wind-structure system,and uses the method to model a wind-plate system. Physical verification test and variation analysis of flow field also has been done. The results show that, when the wind speed are 3.46m/s and 4.58m/s, the maximum relative error between simulation values and experimental value are 8.6% and 5.5%, the maximum relative error between simulation values and calculated values are 8.7% and 5.2%. This shows that we can get high precision of wind-structure system by using multi material ALE method, and it can be applied to the simulation of wind-structure system. This paper provides a basis for using the multi material ALE method to model a wind-sugar cane-soil coupling system.

关键词： multi material ALE wind-structure system fluid-structure interaction simulation

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