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检索条件"主题词=FLUID-structure interaction"

共 6345 条记录，以下是241-250 订阅

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fluid-structure interaction Simulation of Parachute in Low Speed Airdrop

Fluid-Structure Interaction Simulation of Parachute in Low S...

引用

World Congress on Engineering (WCE 2013)

作者： Gao Xing-long Zhang Qing-bin Tang Qian-gang Yang Tao Natl Univ Def Technol Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9789881925299

Parachute is a kind of high performance decelerators with sophisticated dynamic behaviors, especially for the inflation process, which is a typical fluid-structure interaction (FSI) problem. This article proposes a numerical study on the inflation of ringslot parachute in low speed airdrop. Combing with the CFD/CSD and Arbitrary Lagrangian Euler (ALE) coupling techniques, the FSI numerical model of ringslot parachute was built;utilizing the computational platform of nonlinear finite element code LS-DYNA, the simulation of FSI results of parachute during inflation process was addressed. The visualization of parachute deformation, canopy projected area and inflation forces are obtained. The FSI mechanism of parachute inflation was analysis. The results validated the validity and veracity of ALE coupling method for the simulation of slots-parachute inflation.

关键词： ringslot parachute fluid-structure interaction Arbitrary Lagrangian Euler parachute inflation

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fluid-structure interaction During the Water Entry of Flexible Cylinders

Fluid-structure Interaction During the Water Entry of Flexib...

引用

International Conference on Numerical Analysis and Applied Mathematics (ICNAAM)

作者： Panciroli, R. Falcucci, G. Erme, G. De Santis, E. Jannelli, E. Univ Niccolo Cusano I-00166 Rome Italy Univ Napoli Parthenope Ctr Direz Isola C4 I-80143 Naples Italy

ISBN: (纸本)9780735412873

In this work, we experimentally study the water entry of flexible cylinders. Experiments are performed in free fall and we explore variations of the entry velocity by varying the drop height. High speed imaging is utilized to study the fluid kinematics, the pile-up evolution, the cavity formation, and the overall structural deflection. The impact dynamics is analyzed through accelerometers, whereby fibre bragg gratings (FBG) measure the punctual deformation at characteristic locations on the cylinder surface. A modal decomposition approach is utilized to reconstruct the overall structural deflection from the punctual strain measurements. The proposed reconstruction methodology is compared against high-speed images. Results show that during the water entry the cylinder mainly deforms in the direction of the hydrodynamic loading, whereby marked vibrations whose amplitude increase with the entry velocity dominate the dynamic response.

关键词： FBG flexible cylinders fluid-structure interaction modal decomposition water entry

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fluid-structure interaction SIMULATION OF THE EDGE-TO-EDGE REPAIR OF THE MITRAL VALVE IN FUNCTIONAL AND DEGENERATIVE STATES

FLUID-STRUCTURE INTERACTION SIMULATION OF THE EDGE-TO-EDGE R...

引用

ASME Summer Bioengineering Conference (SBC)

作者： Lau, K. D. Burriesci, G. Diaz-Zuccarini, V. UCL Ctr Math & Phys Life Sci & Expt Biol CoMPLEX London WC1E 6BT England

ISBN: (纸本)9780791844809

The ETER restores function to the valve in closure (systole), however in opening (diastole) the function of the valve and the fluid are both altered. Increases in the stress magnitude are doubled, with the distribution of stress is shifted to the location of the correction. In normal scenarios the MV regulates the flow rate by deforming freely to adapt to the required flow rate. The ETER of the valve impairs the valve's ability to deform freely, thus reducing the flow rate throughout the diastolic simulation and shifting the peak maximum flow rate. Copyright © 2012 by ASME.

关键词： Degenerative Mitral Regurgitation Edge-to-Edge Repair fluid-structure interaction Functional Mitral Regurgitation Heart Valve Hyperelastic Mitral Valve

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fluid-structure interaction ANALYSIS OF A PERISTALTIC PUMP BY USING NUMERICAL AND EXPERIMENTAL METHODS

FLUID-STRUCTURE INTERACTION ANALYSIS OF A PERISTALTIC PUMP B...

引用

ASME Pressure Vessels and Piping Conference (PVP)

作者： Li, Qingye Zong, Chaoyong Zhang, Jianhua Zhang, Yanfeng Songa, Xueguan Dalian Univ Technol Sch Mech Engn Dalian 116023 Peoples R China Baoding Lead Fluid Technol Co Ltd Baoding 071000 Peoples R China Hebei Prov Fluid Precis Transmiss Technol Innovat Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9780791886168

Peristaltic pump is an important transport device which is widely used in industries involving pharmaceutical, petrochemical, biomedical, and food processing. For designed and/or optimized purpose, it is necessary to have a thorough understanding the mechanism of its dynamics. For this purpose, both numerical and experimental investigations have been performed in this paper. In the numerical study, a numerical model concerning two-way fluid-structure interaction (FSI) phenomenon is developed, where the Mooney-Rivlin hyper-elasticity model and dynamic mesh technique are employed to simulate a complete operating period of a peristaltic pump. For model verification, a series of experimental tests are performed and the results of the simulation and the tests were compared, which showed a good agreement. With the validated model, a detailed velocity and pressure distribution of a working period of the peristaltic pump is obtained, the mass flow rate is analyzed to illustrate the mechanism of the flow fluctuations.

关键词： fluid-structure interaction peristaltic pump numerical simulation hyper-elasticity model computational fluid dynamics

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fluid-structure interaction MODELING OF ARTERY ANEURYSMS WITH STEADY-STATE CONFIGURATIONS 7

FLUID-STRUCTURE INTERACTION MODELING OF ARTERY ANEURYSMS WIT...

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7th International Conference on Coupled Problems in Science and Engineering (COUPLED PROBLEMS)

作者： Aulisa, Eugenio Bornia, Giorgio Calandrini, Sara Texas Tech Univ Dept Math & Stat Lubbock TX 79409 USA

ISBN: (纸本)9788494690921

This paper addresses numerical simulations of fluid-structure interaction (FSI) problems involving artery aneurysms, focusing on steady-state configurations. Both the fluid flow and the hyperelastic material are incompressible. A monolithic formulation for the FSI problem is considered, where the deformation of the fluid domain is taken into account according to an Arbitrary Lagrangian Eulerian (ALE) scheme. The numerical algorithm is a Newton-Krylov method combined with geometric multigrid preconditioner and smoothing based on domain decomposition. The system is modeled using a specific equation shuffling that aims at improving the row pivoting. Due to the complexity of the operators, the exact Jacobian matrix is evaluated using automatic differentiation tools. We describe benchmark settings which shall help to test and compare different numerical methods and code implementations for the FSI problem in hemodynamics. The configurations consist of realistic artery aneurysms. A case of endovascular stent implantation on a cerebral aneurysm is also presented. Hybrid meshes are employed in such configurations. We show numerical results for the described aneurysm geometries for steady-state boundary conditions. Parallel implementation is also addressed.

关键词： Cerebral aneurysms Incompressible Navier-Stokes equations fluid-structure interaction Intracranial stent

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fluid-structure interaction of Circular Cylinder Flow with Bidirectional Splitter Plates

Fluid-Structure Interaction of Circular Cylinder Flow with B...

引用

Global OCEANS Singapore - U.S. Gulf Coast Conference

作者： Dang, Zhigao Mao, Zhaoyong Song, Baowei Tian, Wenlong Northwestern Polytech Univ Sch Marine Sci & Technol Xian Peoples R China

ISBN: (纸本)9781728154466

Flow past a circular cylinder is a classical topic in ocean engineering application, such as the marine riser, oil pipeline, etc. When the ocean current flows around cylinder structures, shedding vortices will appear alternately in the wake of the cylinder at a certain Reynolds number, which is harmful to the service life of ocean engineering structures. Among the abundant active and passive methods of flow control, the splitter plate behind the circular cylinder is a popular choice to improve the flow field of the circular cylinder. It should be noted that the motions of the splitter plate are neglected because most of the present studies treat the splitter plate as rigid body. Therefore, the fluid-structure interaction (FSI) effect between the fluid and the splitter plate is taken into account in the present study. What's more, a new idea with bidirectional splitter plates are proposed to improve the flow field with beneficial effects. Correspondingly, the relationships between the ratios of RMS lift and mean drag coefficients by original circular cylinder with different configurations of the splitter plate are given.

关键词： circular cylinder fluid-structure interaction splitter plate lift drag

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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...

引用

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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fluid-structure interaction of Pre- and Post-operative Abdominal Aortic Aneurysms

引用

11th International Congress of the IUPESM/World Congress on Medical Physics and Biomedical Engineering

作者： Molony, D. S. Walsh, M. T. McGloughlin, T. M. Univ Limerick CABER Limerick Ireland Univ Limerick Mat & Surface Sci Inst Limerick Ireland

ISBN: (纸本)9783642038815

Endovascular aneurysm repair (EVAR) is a surgical technique for the treatment of abdominal aortic aneurysms (AAA). The aim of EVAR is to shield the aneurysm from the pressure of arterial blood flow. It has been shown in idealised models that the stress on the aneurysm wall does not reduce to zero after EVAR. A fluid solver (Fluent) and structural solver (Abaqus) were coupled via an external software (MpCCI) to calculate the wall stresses in a patient specific AAA. CT scan data was used to reconstruct both pre- and post-operative models. Simulations indicated that the peak wall stress on the aneurysm was reduced by 95% after EVAR. The highest post-operative stresses were found to exist in locations where the stent-graft was in contact with the artery walls. Post-operative stress patterns may explain how aneurysm morphology changes over time after EVAR.

关键词： aneurysm stent-graft fluid-structure interaction patient-specific

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

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

引用

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 ANALYSIS OF CRESCENT-SHAPED WINGSAILS 43

FLUID-STRUCTURE INTERACTION ANALYSIS OF CRESCENT-SHAPED WING...

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ASME 43rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Zhu, Heng Chernoray, Valery Ringsberg, Jonas W. Yao, Hua-Dong Ramne, Bengt Chalmers Univ Technol Dept Mech & Maritime Sci Gothenburg Sweden ScandiNAOS AB Gothenburg Sweden

ISBN: (纸本)9780791887844

The use of wind-assisted ship propulsion is regarded as one of the effective ways to reduce greenhouse gas emissions. This study combines wind tunnel experiments and advanced numerical simulations to investigate the model-scale effects and fluid-structure interaction (FSI) of a wingsail with a crescent-shaped profile. First, a wind tunnel test is carried out to study the aerodynamic loads and flutter of the wingsail. Next, a numerical method for analyzing FSI, fully coupling computational fluid dynamics and finite element analysis, is established. By comparing the experimental and numerical results, the model-scale effect that has an influence on the accuracy of prediction, e.g., laminar-turbulent transition, is discussed. Then, a full-scale FSI simulation based on a simplified solid model was performed to study the flutter and its influence on the propulsive performance. The results indicate that the crescent-shaped profile causes notable periodic oscillations due to strong flow separation, significantly affecting propulsive performance. These insights are crucial for the design and optimization of wingsail structures in enhancing windassisted ship propulsion.

关键词： fluid-structure interaction wind-assisted ship propulsion wingsail wind tunnel test

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