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fluid-structure interaction of panel in supersonic fluid passage

Journal of Harbin Institute of Technology(New Series) 2008年第5期15卷 663-668页

作者：刘占生张云峰田新 School of Power Machinery and Engineering Harbin Institute of Technology

fluid-structure interaction of panel in supersonic fluid passage is studied with subcycling and spline interpolation based predict-correct scheme. The passage is formed with two parallel panels, one is rigid and the other is flexible. The interaction between fluid flows and flexible panel is numerically studied, mainly focused on the effect of dynamic pressure and distance between two parallel panels. Subcycling and spline interpolation based predict-correct scheme is utilized to combine the vibration and fluid analysis and to stabilize long-term calculations to get accurate results. It’s demonstrated that the flutter characteristic of flexible panel is more complex with the increase of dynamic pressure and the decrease of distance between two parallel panels. Via analyzing the propagation and reflection of disturbance in passage, it’s determined as a main cause of the variations.

关键词： panel flutter fluid-structure interaction subcycling predict-correct scheme

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fluid-structure interaction approaches on fixed grids based on two different domain decomposition ideas

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INTERNATIONAL JOURNAL OF COMPUTATIONAL fluid DYNAMICS 2008年第6期22卷 411-427页

作者： Wall, Wolfgang A. Gamnitzer, Peter Gerstenberger, Axel Tech Univ Munich Chair Computat Mech D-8046 Garching Germany

This paper presents two domain decomposition techniques for fixed grid fluid-structure interaction simulations that can be applied to the interaction of general structures with incompressible flows. One approach is based on an overlapping domain decomposition idea while the other uses non-overlapping domains. The first technique combines a fixed grid Chimera approach with arbitrary Lagrangean Eulerian based methods, the second one is based on an eXtended Finite Element Method (XFEM) strategy. Both techniques are used in a partitioned and strong coupling fluid-structure framework. The usage of such fixed-grid methods considerably increases the range of possible applications. Several test examples demonstrate key features of both methods.

关键词： fluid-structure interaction extended finite element method Chimera method domain decomposition Lagrange multiplier ALE

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Underwater energy harvesting from a turbine hosting ionic polymer metal composites

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SMART MATERIALS AND structureS 2014年第8期23卷

作者： Cellini, Filippo Pounds, Jason Peterson, Sean D. Porfiri, Maurizio NYU Polytech Sch Engn MetroTech Ctr 6 Dept Mech & Aerosp Engn Brooklyn NY 11201 USA Univ Waterloo Dept Mech & Mech Engn Waterloo ON N2L 3G1 Canada

In this study, we explore the possibility of energy harvesting from fluid flow through a turbine hosting ionic polymer metal composites (IPMCs). Specifically, IPMC harvesters are embedded in the blades of a small-scale vertical axis water turbine to convert flow kinetics into electrical power via low-frequency flow-induced IPMC deformations. An in-house fabricated Savonius-Darrieus hybrid active turbine with three IPMCs is tested in a laboratory water tunnel to estimate the energy harvesting capabilities of the device as a function of the shunting electrical load. The turbine is shown to harvest a few nanowatt from a mean flow of 0.43 m s(-1) for shunting resistances in the range 100-1000 Omega. To establish a first understanding of the energy harvesting device, we propose a quasi-static hydroelastic model for the bending of the IPMCs and we utilize a black-box model to study their electromechanical response.

关键词： energy harvesting fluid-structure interaction hydrodynamics hydroelastic coupling ionic polymer metal composite Savonius rotor

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ST and ALE-VMS methods for patient-specific cardiovascular fluid mechanics modeling

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MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES 2014年第12期24卷 2437-2437页

作者： Takizawa, Kenji Bazilevs, Yuri Tezduyar, Tayfun E. Long, Christopher C. Marsden, Alison L. Schjodt, Kathleen Waseda Univ Dept Modern Mech Engn Shinjuku Ku Tokyo 1698050 Japan Waseda Univ Waseda Inst Adv Study Shinjuku Ku Tokyo 1698050 Japan Univ Calif San Diego La Jolla CA 92093 USA Rice Univ Houston TX 77005 USA Los Alamos Natl Lab Los Alamos NM 87545 USA

This paper provides a review of the space-time (ST) and Arbitrary Lagrangian-Eulerian (ALE) techniques developed by the first three authors' research teams for patient-specific cardiovascular fluid mechanics modeling, including fluid-structure interaction (FSI). The core methods are the ALE-based variational multiscale (ALE-VMS) method, the Deforming-Spatial-Domain/Stabilized ST formulation, and the stabilized ST FSI technique. A good number of special techniques targeting cardiovascular fluid mechanics have been developed to be used with the core methods. These include: (i) arterial-surface extraction and boundary condition techniques, (ii) techniques for using variable arterial wall thickness, (iii) methods for calculating an estimated zero-pressure arterial geometry, (iv) techniques for prestressing of the blood vessel wall, (v) mesh generation techniques for building layers of refined fluid mechanics mesh near the arterial walls, (vi) a special mapping technique for specifying the velocity profile at an inflow boundary with non-circular shape, (vii) a scaling technique for specifying a more realistic volumetric flow rate, (viii) techniques for the projection of fluid-structure interface stresses, (ix) a recipe for pre-FSI computations that improve the convergence of the FSI computations, (x) the Sequentially-Coupled Arterial FSI technique and its multiscale versions, (xi) techniques for calculation of the wall shear stress (WSS) and oscillatory shear index (OSI), (xii) methods for stent modeling and mesh generation, (xiii) methods for calculation of the particle residence time, and (xiv) methods for an estimated element-based zero-stress state for the artery. Here we provide an overview of the special techniques for WSS and OSI calculations, stent modeling and mesh generation, and calculation of the residence time with application to pulsatile ventricular assist device (PVAD). We provide references for some of the other special techniques. With results from earl

关键词： Cardiovascular fluid mechanics fluid-structure interaction cerebral aneurysms pulsatile ventricular assist devices stents ALE methods ST methods special techniques

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Study of dynamic underwater implosion mechanics using digital image correlation

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PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 2014年第2172期470卷 1-17页

作者： Gupta, Sachin Parameswaran, Venkitanarayanan Sutton, Michael A. Shukla, Arun Univ Rhode Isl Dept Mech Ind & Syst Engn Dynam Photo Mech Lab Kingston RI 02881 USA Indian Inst Technol Dept Mech Engn Kanpur 208016 Uttar Pradesh India Univ S Carolina Dept Mech Engn Columbia SC 29208 USA

The physical processes associated with the implosion of cylindrical tubes in a hydrostatic underwater environment were investigated using high-speed three-dimensional digital image correlation (3D DIC). This study emphasizes visualization and understanding of the real-time deformation of the implodable volume and the associated fluid-structure interaction phenomena. Aluminium 6061-T6 cylindrical tubes were used as the implodable volumes. Dynamic tourmaline pressure transducers were placed at selected locations to capture the pressure history generated during each implosion event. A series of small-scale calibration experiments were first performed to establish the applicability of 3D DIC for measuring the deformation of submerged objects. The results of these experiments indicated that the effects of refraction due to water and the optical windows can be accounted for by evaluation of the camera's intrinsic and extrinsic parameters using a submerged calibration grid when the surface normal of the optical windows is collinear with the camera's optical axis. Each pressure history was synchronized with its respective high-speed DIC measurements. DIC results showed that the highest rate of increase in contact area correlates to the largest pressure spike during the implosion process. The results also indicated that, for a given diameter, longer implodable volumes generated higher pressure spikes.

关键词： digital image correlation submerged objects implosion implodable volume fluid-structure interaction high-speed stereo-photography

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Energy harvesting from a vortex ring impinging on an annular ionic polymer metal composite

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SMART MATERIALS AND structureS 2014年第7期23卷

作者： Hu, JiaCheng Cha, Youngsu Porfiri, Maurizio Peterson, Sean D. Univ Waterloo Dept Mech & Mechatron Engn Waterloo ON N2L 3G1 Canada NYU Polytech Sch Engn Dept Mech & Aerosp Engn Brooklyn NY 11201 USA

The energy exchange between a vortex ring and an annular ionic polymer metal composite (IPMC) plate is explored during impact. The vortex ring axis of symmetry is aligned with the geometric center of the annulus, and the ring radius is slightly larger than the hole in the structure. Experimental results show that as the vortex ring approaches the IPMC, the plate initially deflects towards the approaching ring. Upon impact, the plate is pushed away from the impacting vortex ring, while a secondary vortex ring is formed at the edge of the hole, which subsequently propagates away from the IPMC. The mechanical strain of the plate during the impact results in a current through the IPMC, which is measured in order to estimate the energy harvesting capacity of this configuration. This preliminary study suggests that approximate to 0.001% of the initial vortex ring energy can be transduced into electrical energy. An analytical model is developed to assess the energy harvesting capacity as a function of the vortex ring circulation. The model is in good agreement with experimental results, and shows a direct proportionality between the vortex ring circulation and the energy generated by the IPMC.

关键词： energy harvesting fluid-structure interaction ionic polymer metal composites particle image velocimetry vortex ring

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Tsunami Modeling, fluid Load Simulation, and Validation Using Geospatial Field Data

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JOURNAL OF STRUCTURAL ENGINEERING 2014年第8期140卷 A4014012.1-A4014012.14页

作者： Yim, Solomon C. Olsen, Michael J. Cheung, Kwok Fai Azadbakht, Mohsen Oregon State Univ Sch Civil & Construct Engn Corvallis OR 97331 USA Univ Hawaii Manoa Dept Ocean & Resources Engn Honolulu HI 96822 USA

This paper presents an integrated, interdisciplinary methodology incorporating multiphysics, multiscale numerical modeling and simulation from tsunami generation, propagation, and inundation to subsequent coupled structural response and associated fluid loads. This novel, cohesive approach performs these simulations across a large spectrum of scales, enabling structural engineers to take full advantage of the detail available in recent advances in tsunami modeling, geospatial data collection, and computational structural mechanics. Extensive seismic networks, geodetic instruments, and water-level stations provide unprecedented data sets, enabling one to model, simulate and reconstruct tsunami events with high fidelity. A number of coordinated, ground-based surveys also collect valuable, time-sensitive quantitative information to improve understanding of structural response to tsunami loading following events. Recently, some of these surveys include high-resolution LIDAR measurements, which provide critical geospatial information to link field observations, topographic mapping, and structural performance to create and validate numerical models, enabling quantification and understanding of structural response and failure modes resulting from tsunami forces. The presented methodology is demonstrated through a case study of a building component which structurally survived the 2011 Tohoku tsunami. (C) 2014 American Society of Civil Engineers.

关键词： Tsunami LIDAR Simulation Computation Finite-element modeling fluid-structure interaction Analysis and computation

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Dynamics of non-axisymmetric Beltrami flows

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PHYSICS OF fluidS 2014年第11期26卷 114104-114104页

作者： Gonzalez, Rafael Univ Nacl Gen Sarmiento Inst Desarrollo Humano RA-1613 Buenos Aires DF Argentina

In previous works [R. Gonzalez, G. Sarasua, and A. Costa, "Kelvin waves with helical Beltrami flow structure," Phys. fluids 20, 024106 (2008) and R. Gonzalez, A. Costa, and E. S. Santini, "On a variational principle for Beltrami flows," Phys. fluids 22, 074102 (2010)], we analyzed the Beltrami flow structure of Kelvin waves in an ideal fluid. As a result, we were able to show an important feature of Beltrami flows: their stability for Beltrami perturbations with the same eigenvalue as the basic flow. Here, instead, we study the dynamics of Beltrami perturbations by performing a modal analysis. In the first place, we study the modes that are generated by perturbing a uniformly translating and solidly rotating basic flow. In order to simplify the analysis, we consider the non-inertial frame in which this basic flow is at rest. In the second place, we analyze a basic Beltrami flow that is stationary in the non-inertial frame considered and is perturbed with Beltrami modes. We find that the last case is only possible when the perturbation eigenvalue is the same as that of the basic Beltrami flow. This is what we have called dynamical property. In both cases, the dynamics are represented by progressive waves in the moving frame. We apply this analysis to a rotating flow in an infinite cylinder and to an axisymmetric rotating Beltrami flow in a semi-infinite cylinder. In both cases, the development of secondary Beltrami modes is possible due to the dynamical property. (C) 2014 AIP Publishing LLC.

关键词： FLOW (fluid dynamics) AXIAL flow fluid-structure interaction OCEAN waves EIGENVALUES

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RESPONSE CONTROL IN fluid-SMART structure interaction

RESPONSE CONTROL IN FLUID-SMART STRUCTURE INTERACTION

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ASME International Design Engineering Technical Conferences/Computers and Information in Engineering Conference

作者： To, C. W. S. Univ Nebraska Dept Mech Engn Lincoln NE 68588 USA

ISBN: (纸本)9780791843277

A formulation with computational procedure for the response control in fluid-smart structure interaction is presented. It exploits the features of the smart triangular shell finite elements developed earlier by the author and his associate, the double asymptotic approximation for fluid-structure interaction of Geers, and the finite element-cum-boundary element method that was proposed by To and O'Grady. To provide a better understanding of the interplay between the structural responses and the applied voltage of the piezoelectric layers, computed results of a three-layered simply-supported plate structure were presented. It was observed that significant deformation reduction can be achieved with applied voltage indicating that with the smart shell finite elements desired deformation at chosen locations of the submerged system can be specified.

关键词： fluid-structure interaction finite elements boundary elements feedback control smart structures

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Elastodynamics of a Two-Dimensional Square Lattice With Entrained fluid-Part I: Comparison With Biot's Theory

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JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME 2014年第2期136卷 021024-021024页

作者： Dorodnitsyn, Vladimir Spadoni, Alessandro Ecole Polytech Fed Lausanne Inst Engn Mech CH-1015 Lausanne Switzerland

In the present paper, the performance of Biot's theory is investigated for wave propagation in cellular and porous solids with entrained fluid for configurations with well-known drained (no fluid) mechanical properties. Cellular solids differ from porous solids based on their relative density rho* < 0.3. The distinction is phenomenological and is based on the applicability of beam (or plate) theories to describe microstructural deformations. The wave propagation in a periodic square lattice is analyzed with a finite-element model, which explicitly considers fluid-structure interactions, structural deformations, and fluid-pressure variations. Bloch theorem is employed to enforce symmetry conditions of a representative volume element and obtain a relation between frequency and wavevector. It is found that the entrained fluid does not affect shear waves, beyond added-mass effects, so long as the wave spectrum is below the pores' natural frequency. One finds strong dispersion in cellular solids as a result of resonant scattering, in contrast to Bragg scattering dominant in porous media. Configurations with 0: 0001 <= rho* <= 1 are investigated. One finds that Biot's theory, derived from averaged microstructural quantities, well estimates the phase velocity of pressure and shear waves for cellular porous solids, except for the limit rho* -> 1. For frequencies below the first resonance of the lattice walls, only the fast-pressure mode of the two modes predicted by Biot's theory is found. It is also shown that homogenized models for shear waves based on microstructural deformations for drained conditions agree with Biot's theory.

关键词： Biot's theory poroelasticity cellular solids band structure fluid-structure interaction

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