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AP1000 Shield Building Dynamic Response for Different Water Levels of PCCWST Subjected to Seismic Loading considering FSI

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SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS 2015年第2-18期2015卷 8-8页

作者： Lu, Daogang Liu, Yu Zeng, Xiaojia North China Elect Power Univ Beijing Key Lab Pass Nucl Safety Technol Beijing 102206 Peoples R China

Huge water storage tank on the top of many buildings may affect the safety of the structure caused by fluid-structure interaction (FSI) under the earthquake. AP1000 passive containment cooling system water storage tank (PCCWST) placed at the top of shield building is a key component to ensure the safety of nuclear facilities. Under seismic loading, water will impact the wall of PCCWST, which may pose a threat to the integrity of the shield building. In the present study, an FE model of AP1000 shield building is built for the modal and transient seismic analysis considering the FSI. Six different water levels in PCCWST were discussed by comparing the modal frequency, seismic acceleration response, and von Mises stress distribution. The results show the maximum von Mises stress emerges at the joint of shield building roof and water around the air inlet. However, the maximum von Mises stress is below the yield strength of reinforced concrete. The results may provide a reference for design of the AP1000 and CAP1400 in the future.

关键词： fluid-structure interaction DYNAMIC models SEISMOLOGY COOLING systems WATER storage STRESS concentration

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Dynamic Effects of Wind Loads on a Gravity Damper

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Procedia Engineering 2015年 109卷 162-170页

作者： L. Scappaticci F. Mariani N. Bartolini F. Risi A. Garinei DMII University Guglielmo Marconi Roma 00193 Italy Department of Engineering University of Perugia Perugia 06125 Italy

The gravity damper is safety device used for the air treatment that prevent overpressure inside the unit through the opening. It is a normally closed valve under the effect of the gravity force, which, under the action of the incident air flow, allows to manage any excess mass. Clearly, although the device is rather simple and therefore reliable, the operating conditions may prove burdensome, especially if the gravity dampers are applied to installations of energy transformation, such as the gas turbines; this is mainly due to the need to develop large masses of air at speeds rather incurred. This article describes an experiment carried out on a gravity damper designed to be installed in a gas turbine. The characterization has been performed in numerical (CFD-FEM), considering both the mode shapes and the natural frequencies of the device in working condition as well as any phenomenon of detachment of the fluid that can trigger vortex shedding and subsequently validated in the wind tunnel facilities of the University of Perugia. In particular, what is wanted to be highlighted is the fact that, after a preliminary analysis, it has been clearly evident that, under the operating conditions, the structure would be affected by phenomena of vortex shedding. The shedding frequency is next to some natural frequencies of the structure, with obvious repercussions on the integrity of the structure. An experimental vibration analysis performed in the wind tunnel at flow regime has in fact allowed to identify the phenomenon of lock-in.

关键词： VIV vortex vhedding lock-in CFD wind tunnel testing FEM fluid-structure interaction

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A Numerical Study on the Effect of Sweep Angle on Flapping-Wing Flight Using fluid-structure interaction Analysis

A Numerical Study on the Effect of Sweep Angle on Flapping-W...

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2nd International Conference on Smart Materials and Nanotechnology in Engineering

作者： Kim, Dae-Kwan Lee, Jun-Seong Han, Jae-Hung Korea Aerosp Res Inst Satellite Control Syst Dept Taejon 305333 South Korea Korea Adv Inst Sci & Technol Dept Aerosp Engn Taejon 305701 South Korea

ISBN: (纸本)9780819478047

The sweep-back effect of a flexible flapping wing is investigated through fluid-structure interaction analysis. The aeroelastic analysis is carried out by using an efficient fluid-structure interaction analysis tool, which is based on the modified strip theory and the flexible multibody dynamics. To investigate the sweep-back effect, the aeroelastic analysis is performed on various sweep-back wing models defined by sweep-chord ratio and sweep-span ratio, and then the sweep-back effect on the aerodynamic performance is discussed. The aeroelastic results of the sweep-back wing analysis clearly confirm that the sweep-back angle can help a flexible flapping wing to generate greater twisting motion, resulting in the aerodynamic improvement of thrust and input power for all flapping-axis angle regimes. The propulsive efficiency can also be increased by the sweep-back effect. The sweep angle of a flapping wing should be considered as an important design feature for artificial flexible flapping wings.

关键词： Flapping wing flexibility effect aeroelastic analysis fluid-structure interaction sweep-back angle

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Implementation of a Parallel fluid-structure interaction Problem

Implementation of a Parallel Fluid-Structure Interaction Pro...

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1st International Conference on Parallel, Distributed and Grid Computing for Engineering

作者： Ivanyi, P. Topping, B. H. V. Univ Pecs Dept Syst & Software Technol Pollack Mihaly Fac Engn Pecs Hungary

ISBN: (纸本)9781905088294

This paper demonstrates the implementation of the algorithm to solve a fluid-structure interaction problem on parallel and distributed computers. The paper presents a partitioned approach where the fluid and the structure are solved separately. The structures considered in the paper are membranes and they may undergo large displacements therefore a parallel mesh modification strategy is also presented. The paper also describes the special aspects of the implementation of the fluid-structure interaction program which relates to parallel and distributed computing.

关键词： fluid-structure interaction Navier-Stokes parallel membranes

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A Meso-scale Model for fluid-microstructure interactions

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Procedia Engineering 2015年 102卷 1356-1365页

作者： Rodrigo Guadarrama-Lara Xiaodong Jia Michael Fairweather Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

Particle-fluid and fluid-structure interactions are important areas in particle technology. Typical processes where such interactions are prevalent include fluidized beds, filtration and sedimentation. In addition, fluid-structure interactions are significant in applications such as nuclear waste management, for example in the cementation process used to store radioactive materials, as well as in carbon capture and storage applications where the leakage of gas injected in underground geological reservoirs must be considered in hazard and risk assessments. Given the difficulties in directly measuring the propagation of cracks in solid structures, their permeability or the internal build-up of any gases, for example, numerical techniques in conjunction with non-destructive measurements are important tools of value in assessing and predicting the behavior of fluid-structure interactions. In this work, coupling between the lattice Boltzmann method and a digital packing algorithm based on the discrete element method is used to provide a basis for predicting such coupled interactions. The development of the coupled algorithm is described, with the calculations performed on a regular lattice grid and based on the momentum exchange method to evaluate the force exerted by the fluid on a solid boundary. A number of test cases are reported to allow assessment of the coupled model's capabilities. Overall, these test cases demonstrate reasonable quantitative agreement with available analytical and experimental results for the case of a sphere settling in a liquid, and the expected qualitative behavior for the case of different orientation cylinders settling in a fluid, and for three dynamic packing processes.

关键词： fluid-structure interaction Lattice Boltzmann method Discrete element method Complex structures.

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Application of ADINA to Modeling of fluid-structure interaction in Buried Liquid-Conveying Pipeline

Application of ADINA to Modeling of Fluid-Structure Interact...

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2nd International Conference on Information and Computing Science

作者： Chen, Yan-Hua Su, You-Po Hebei Polytech Univ Coll Civil Engn & Architecture Tangshan 063009 Peoples R China

ISBN: (纸本)9780769536347

Finite element modeling of buried liquid-conveying pipeline for the calculation of fluid structure interaction is the key to analyze the damage of long distance buried liquid-conveying pipeline. Because the influence of site, fault movement, and earthquake, etc. it is necessary to calculate fluid-structure interaction (FSI) in finite element analysis under pipe-soil interaction. Finite element model of buried liquid-conveying pipeline for the calculation of fluid structure interaction is constructed through combination of ADINA-parasolid and ADINA-native modeling methods, and the direct computing method of two-way fluid-structure coupling is introduced. Pipe-soil friction is defined in solid model, special flow assumption and fluid structure interface condition are defined in fluid model. Damage of buried liquid-conveying pipeline is investigated through computing of fluid-structure coupling. Results are analyzed, and some advice is proposed.

关键词： finite element fluid-structure interaction ADINA modeling buried liquid-converying pipeline

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Extreme Deformation of Capsules and Bubbles Flowing through a Localised Constriction

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Procedia IUTAM 2015年 16卷 22-32页

作者： Geoffrey Dawson Edgar Häner Anne Juel Manchester Centre for Nonlinear Dynamics and School of Physics and Astronomy University of Manchester Oxford Road Manchester M13 9PL UK

We explore experimentally the motion of deformable objects – bubbles and capsules – through narrow localised constrictions, with widths between 16 and 32% of the diameter of the object. Under constant volume-flux flow, both bubbles and capsules extend to a maximum length as their front passes through the constriction. Rapid contraction occurs as their rear accelerates towards the constriction, followed by relaxation upon exiting the constriction. We find that the large deformations imposed by narrowing constrictions and increasing flow rates highlight distinguishing features between bubbles and capsules, which reflect their distinct mechanics. These include tip-streaming of the rear of the bubble, buckling of the capsule upon contraction and wrinkling of the capsule membrane through excessive compressive strains. Finally, we present evidence of distinct modes of rupture for bubbles and capsule as the flow rate is further increased.

关键词： biological fluid dynamics capsule bubble fluid-structure interaction wrinkling folding tip-streaming

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Fracture of Cylindrical Shells Subjected to Internal Explosion: Numerical Simulation

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Procedia Engineering 2015年 130卷 1695-1704页

作者： Y. Du L. Ma J.Y. Zheng Institute of Process Equipment Zhejiang University Hangzhou 310027 China The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China High-pressure process equipment and safety engineering research center of ministry of education Zhejiang University Hangzhou 310027 China

Coupled analysis of explosion-driven fracture is a challenging task due to complicated fluid-structure interactions (FSI) and local large deformations. In this paper, a coupled Finite Element Method-Smoothed Particle Hydrodynamics (FEM-SPH) method was proposed to simulate the fracture of cylindrical shell subjected to internal explosion. The cylindrical shell was modeled by FEM and the movement of detonation products was modeled by SPH, where they were coupled by penalty contact algorithm. A rate-dependent failure criterion for steels at high strain rate conditions was employed in the simulation, which was presented and verified in our previous work. Results showed the interaction between blast wave and cylindrical shell, the dynamic crack propagation and the finial fracture morphology of cylindrical shell. The decoupled analysis was also conducted to make a comparison. It is found the coupled FEM-SPH method can well handle the complicated FSI problem which including local large deformations and ruptures. Compared with decoupled analysis, the fracture of coupled FEM-SPH analysis shows a better agreement with experimental results. In addition, though the over-predicted explosive loads in decoupled analysis cause a severer bulging deformation of cylindrical shell, but the finial fracture is smaller than that of coupled FEM-SPH analysis.

关键词： cylindrical shell dynamic fracture explosion fluid-structure interaction Smoothed Particle Hydrodynamics

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Enhancement in Ultrasonic Micro-Transport Using Focused Inter-Digital Transducers in a Surface Acoustic Wave Device: fluid-structure interaction Study

Enhancement in Ultrasonic Micro-Transport Using Focused Inte...

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8th IEEE Conference on Sensors

作者： Singh, Reetu Bhethanabotla, Venkat R. Univ S Florida Dept Chem & Biomed Engn Sensors Res Lab Tampa FL 33620 USA

ISBN: (纸本)9781424445486

Biosensing and microfluidic applications of surface acoustic wave (SAW) devices, involving micro-transport, rely on acoustic streaming resulting from high intensity sound waves interacting with the fluid medium. In this work, we investigate the enhancement in the efficiency of acoustic streaming via the use of interdigital transducer (IDT) modifications, viz. focused IDTs (F-IDTs). We have developed, for the first time, a three dimensional bi-directionally coupled fluid-structure interaction finite element model of a focused SAW (F-SAW) device with F-IDTs based on concentric wave surfaces and subject to liquid loading. The simulated device displacement profiles indicate focusing and enhancement of surface displacement amplitudes, instantaneous fluid velocities, and streaming velocities in a F-SAW device compared to a conventional SAW device having uniform IDTs with a similar size, finger periodicity and applied input voltage. Furthermore, the F-SAW device brings about focusing of acoustic energy near the center of the device, thereby enhancing the device displacements and fluid velocities in the center of the delay path in contrast to the conventional SAW in which these quantities decay on moving away from input IDTs towards the device center. Thus, our results indicate enhancement in acoustic streaming induced flow in F-SAW devices compared to conventional SAW. The results have a general applicability for various biosensing and microfluidic actuation applications that rely on the acoustic streaming phenomenon.

关键词： focused SAW streaming fluid-structure interaction

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AN IMPROVED MOMENTUM-EXCHANGED IMMERSED BOUNDARY-BASED LATTICE BOLTZMANN METHOD FOR INCOMPRESSIBLE VISCOUS THERMAL FLOWS

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International Journal of Modern Physics: Conference Series 2016年第42期ijmpcs卷

作者： MUFENG CHEN XIAODONG NIU College of Engineering Shantou University 243 Daxue Rd. Shantou Guangdong China

An improved momentum-exchanged immersed boundary-based lattice Boltzmann method (MEIB-LBM) for incompressible viscous thermal flows is presented here. MEIB-LBM was first proposed by Niu et al, which has been shown later that the non-slip boundary condition is not satisfied. Wang. et al. and Hu. et al overcome this drawback by iterative method. But it needs to give an appropriate relaxation parameter. In this work, we come back to the intrinsic feature of LBM, which uses the density distribution function as a dependent variable to evolve the flow field, and uses the density distribution function correction at the neighboring Euler mesh points to satisfy the non-slip boundary condition on the immersed boundary. The same idea can also be applied to the thermal flows with fluid-structure interference. The merits of present improvements for the original MEIB-LBM are that the intrinsic feature of LBM is kept and the flow penetration across the immersed boundaries is avoided. To validate the present method, examples, including forced convection over a stationary heated circular cylinder for heat flux condition, and natural convection with a suspended circle particle in viscous fluid, are simulated. The streamlines, isothermal contours, the drag coefficients and Nusselt numbers are calculated and compared to the benchmark results to demonstrate the effective of the present method.

关键词： fluid-structure interaction heat transfer characteristics moving boundary

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