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Evaluation of dentinal fluid flow behaviours: a fluid-structure interaction simulation

COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2014年第15期17卷 1716-1726页

作者： Su, Kuo-Chih Chuang, Shu-Fen Ng, Eddie Yin-Kwee Chang, Chih-Han Natl Cheng Kung Univ Coll Engn Dept Biomed Engn Tainan 70101 Taiwan Natl Cheng Kung Univ Coll Med & Hosp Dept Stomatol Tainan 70101 Taiwan Nanyang Technol Univ Sch Mech & Aerosp Engn Coll Engn Singapore 639798 Singapore

This study uses the fluid-structure interaction (FSI) method to investigate the fluid flow in dental pulp. First, the FSI method is used for the biomechanical simulation of dental intrapulpal responses during force loading (50, 100 and 150 N) on a tooth. The results are validated by comparison with experimental outcomes. Second, the FSI method is used to investigate an intact tooth subjected to a mechanical stimulus during loading at various loading rates. Force loading (0-100 N) is applied gradually to an intact tooth surface with loading rates of 125, 62.5, 25 and 12.5 N/s, respectively, and the fluid flow changes in the pulp are evaluated. FSI analysis is found to be suitable for examining intrapulpal biomechanics. An external force applied to a tooth with a low loading rate leads to a low fluid flow velocity in the pulp chamber, thus avoiding tooth pain.

关键词： dental biomechanics dentinal fluid flow fluid-structure interaction computational fluid dynamics finite element simulation

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fluid-structure interaction Simulation of Parachute in Low Speed Airdrop

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

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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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Free Transverse Vibration Analysis of an Underwater Launcher Based on fluid-structure interaction

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Journal of Marine Science and Application 2014年第2期13卷 178-184页

作者： Qingyong Niu School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Huazhong University of Science and TechnologyWuhan 430074 China

A pneumatic launcher is theoretically investigated to study its natural transverse vibration in water. Considering the mass effect of the sealing cover, the launcher is simplified as a uniform cantilever beam with a top point mass. By introducing the boundary and continuity conditions into the motion equation, the natural frequency equation and the mode shape function are derived. An iterative calculation method for added mass is also presented using the velocity potential function to account for the mass effect of the fluid on the launcher. The first 2 order natural frequencies and mode shapes are discussed in external flow fields and both external and internal flow fields. The results show good agreement with both natural frequencies and mode shapes between the theoretical analysis and the FEM studies. Also, the added mass is found to decrease with the increase of the mode shape orders of the launcher. And because of the larger added mass in both the external and internal flow fields than that in only the external flow field, the corresponding natural frequencies of the former are relatively smaller.

关键词： underwater launcher free transverse vibration naturalfrequency mode shape added mass fluid-structure interaction

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Numerical investigation of residual heat removal pumps based on fluid-structure interaction in 1000 MW nuclear power plants

Numerical investigation of residual heat removal pumps based...

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2014 ISFMFE - 6th International Symposium on fluid Machinery and fluid Engineering

作者： Banglun Zhou Jianping Yuan Jiaxing Lu Wenting Sun Yin Luo Ji Pei National Research Center of Pumps Jiangsu University Zhenjiang China

ISBN: (纸本)9781510804159

Residual heat removal pump (RHRP) is one of key equipments in 1000 MW nuclear power plants; its faction is to transport high temperature and pressure medium. Vibration and dynamic stress which is caused by the interaction between the fluid and structure can affect the reliability of RHRP. This paper presents an investigation of internal flow field of residual heat removal pumps, by using a combined calculation for turbulent flow and structure response of impeller was first established using one-way coupling method. For the calculation, the flow field is based on Reynolds-averaged equations that resemble the shear stress transport (SST) k-ω turbulence model and the structure response is based on elastic structural dynamic equation. The dynamic stresses in the rotor system are computed according to the fourth strength theory. The results show that the domain frequencies of pressure fluctuations of monitors on the outlet of impeller are 5 f n (rotating shaft frequency), 10 f n , 15 f n and 20 f n . The amplitude of the relatively large pressure fluctuations peak is lowest under the design flow rate operating condition. The time-average radial force value at the design condition is the smallest. The hydraulic force magnitude at the maximum operating condition is the largest and phase different can be clearly seen among the results obtained under different conditions. The relatively large stress of rotor for all conditions is the biggest at shaft shoulder near the bearing, and it increases with flow rate. The relatively large displacement value of monitoring point at the impeller outlet is bigger than monitoring point at the wear ring of impeller.

关键词： Dynamic Stress fluid-structure interaction Numerical Simulation Radial Force Residual Heat Removal Pump

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The fluid-structure interaction study of spiral groove upstream pumping mechanical seal

The fluid-structure interaction study of spiral groove upstr...

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2014 ISFMFE - 6th International Symposium on fluid Machinery and fluid Engineering

作者： Huilong Chen Cheng Xu Qiangbo Wu Muzi Zuo Binjuan Zhao Department of Energy and Power Engineering Jiangsu University Zhenjiang China

ISBN: (纸本)9781510804159

To further study the characteristics of spiral groove upstream pumping mechanical face seal, a fluid-structure interaction CFD model is developed by the software ANSYS Workbench. The model can be used to predict the pressure distribution and pressure distortion of the seal pair. Compared to the single simulation of fluid film, and to one-way fluid-solid coupling, the results of two-way fluid-solid coupling are closer to the experimental date. The maximum deformation occurs in the top of the spiral groove of the rotating ring surface, while the maximum stress occurs at the back step seal of the rotating ring. Based on the CFD model, several common mechanical seal materials are used for a comparative analysis. It is found that material with higher Young's modulus can reduce the deformation, which is fit for spiral groove upstream pumping mechanical face seal without taking some other requirements into consideration. In order to reduce the deformation in the mating surface, it is suggested that the rotational ring should use hard mechanical seal material and the stationary ring should use soft material.

关键词： fluid-structure interaction Sealing Material structure Deformation Up-Stream Pumping Mechanical Seal

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Outside Characteristics and Impeller Deformation of Centrifugal Pump Strength Analyzing Based on fluid-structure interaction

Outside Characteristics and Impeller Deformation of Centrifu...

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2014 4th International Conference on Education and Education Management(EEM 2014)

作者： Ning Fan Yi Gao Liaoning Jianzhu Vocational University Research Center of Fluid Machinery Engineering and Technology Jiangsu University

Centrifugal pump BQS50-400/2-200 / N is the object of the research in this paperFrom the view of the reliability of the pump operation based on fluid mechanics analysis tools CFX and structure analysis tools ANSYS/MECHANICAL are used to research centrifugal pump for fluid-solid coupling analysisCompared to the equivalent conventional pressure hypothesis and the indirect coupling method, this method can be more accurate prediction of pump in the impeller by the stress and deformationThis paper provided theoretical basis and new methods for design and calculation of the centrifugal pump impeller strength.

关键词： Centrifugal pump fluid-structure interaction Impeller Numerical simulation Strength calculation

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fluid-structure interactions of cage based aquaculture: From structures to organisms

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OCEAN ENGINEERING 2020年 217卷

作者： Xu, Zhijing Qin, Hongde Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China Univ New Hampshire Dept Mech Engn Durham NH 03824 USA

The study of how fluid interacts with aquaculture cages and how it influences fish swimming behaviour has proven to be of great importance for designing offshore aquaculture cage systems. This review examines the fluid-structure interactions, between structures and organisms, within cage-based aquaculture. Using data from previous research, we list and classify aquaculture cages into net-cage and closed-cage systems. Net-cage aquaculture systems are classified with regards to their submergence, materials and aperture shapes of nets. Then, the comparison is made between the research methods used to assess the interactions between environmental loads and aquaculture cages;this comparison includes analytical studies, numerical implementations, field tests and laboratory experiments. We also provide reviews of topics such as mooring and grid systems, drag coefficients of the net panel, hydrodynamic behaviours of cage components, velocity reduction of cage array and volume reduction caused by cage deformation. In particular, fish swimming behaviour is reviewed for designing new open ocean aquaculture systems. To support the further development of aquaculture engineering and technology, statistics, tables, formulae and figures are provided.

关键词： fluid-structure interaction Aquaculture cage Fish swimming behaviour Contents

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Application of the fluid-structure interaction technique for the analysis of hydrodynamic lubrication problems

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 2013年第8期227卷 888-897页

作者： Wodtke, Michal Olszewski, Artur Wasilczuk, Michal Gdansk Univ Technol Fac Mech Engn PL-80233 Gdansk Poland

fluid-structure interaction technique seems to be one of the most promising possibilities for theoretical analysis of lubrication problems. It allows coupling of different physical fields in one computational task, taking into account the interaction between them. In this article, two sets of fluid-structure interaction analyses focusing on the bearing performance evaluation are presented. One analysis was applied to a water-lubricated journal bearing and the other to a hydrodynamic thrust bearing lubricated with oil. Steady-state operation was considered in both cases. In the presented cases of fluid-structure interaction analyses, all important phenomena accompanying bearing operation are considered, e.g. lubricant flow, structure movements and their deformations as well as heat transfer in case of thrust bearing. The problems encountered during modelling are discussed in this article, as well as the results of calculations: hydrodynamic pressures, gap geometries or temperature profiles.

关键词： Bearing analysis fluid-structure interaction computational fluid dynamic water lubrication cavitation oil lubrication journal bearing thrust bearing

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Boundary velocity method for continuum shape sensitivity of nonlinear fluid-structure interaction problems

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JOURNAL OF fluidS AND structureS 2013年 40卷 284-301页

作者： Liu, Shaobin Canfield, Robert A. Virginia Tech Dept Aerosp & Ocean Engn Blacksburg VA 24061 USA

A Continuum Sensitivity Equation (CSE) method was developed in local derivative form for fluid-structure shape design problems. The boundary velocity method was used to derive the continuum sensitivity equations and sensitivity boundary conditions in local derivative form for a built-up joined beam structure under transient aerodynamic loads. For nonlinear problems, when the Newton-Raphson method is used, the tangent stiffness matrix yields the desired sensitivity coefficient matrix for solving the linear sensitivity equations in the Galerkin finite element formulation. For built-up structures with strain discontinuity, the local sensitivity variables are not continuous at the joints, requiring special treatment to assemble the elemental local sensitivities and the generalized force vector. The coupled fluid-structure physics and continuum sensitivity equations for gust response of a nonlinear joined beam with an airfoil model were posed and solved. The results were compared to the results obtained by finite difference (FD) method. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Shape sensitivity analysis Continuum sensitivity method fluid-structure interaction Boundary velocity method

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A new added mass method for fluid-structure interaction analysis of deep-water bridge

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KSCE JOURNAL OF CIVIL ENGINEERING 2013年第6期17卷 1413-1424页

作者： Yang, Wanli Li, Qiao Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China

In order to calculate hydrodynamic pressure of piers with arbitrary cross-sections under earthquake, a new added mass method is presented. To accomplish this, the relation between fundamental frequency reduction rate and the ratio of added mass to structural mass per unit length is deduced. The relation is validated by using added mass from Morison equation. The fundamental frequency reduction rates of arbitrary section piers are available by utilizing the fluid element method in ANSYS, added masses of any piers are achieved according to the relation. Based on added mass data, the expressions of which can be proposed by curve fitting. The added mass expressions for two kinds of piers, circular and square, are suggested and compared with other two methods. Results show that the new method is accurate in both dynamic property calculation and harmonic response calculation. Practical application reveals that the new method is an accurate, efficient and adaptable way to evaluate hydrodynamic pressure under earthquake.

关键词： added mass fluid-structure interaction deep-water bridge hydrodynamic pressure earthquake curve fitting

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