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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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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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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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Numerical Simulation of Low Reynolds Number fluid-structure interaction with Immersed Boundary Method

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Chinese Journal of Aeronautics 2009年第5期22卷 480-485页

作者： Ming Pingjian Zhang Wenping School of Power and Energy Engineering Harbin Engineering University Harbin 150001 China

This article introduces a numerical scheme on the basis of semi-implicit method for pressure-linked equations （SIMPLE） algorithm to simulate incompressible unsteady flows with fluid-structure interaction. The Navier-Stokes equation is discretized spatially with collocated finite volume method and Eulerian implicit method in time domain. The hybrid method that combines immersed boundary method （IBM） and volume of fluid （VOF） method is used to deal with rigid body motion in fluid domain. The details of movement of immersed boundary （IB） and calculation of VOF are also described. This method can be easily applied to any existing finite-volume-based computational fluid dynamics （CFD） solver without complex operation, with which fluid flow interaction of arbitrarily complex geometry can be realized on a fixed mesh. The method is verified by low Reynolds number flows passing both stationary and oscillating cylinders. The drag and lift coefficients acquired by the study well accord with other published results, which indicate the reasonability of the proposed method.

关键词： fluid-structure interaction immersed boundary method volume of fluid vortex shedding incompressible flow

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Three-dimensional Numerical Simulation of the Movement of the Flexible Body under Different Constraints

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Journal of Thermal Science 2014年第6期23卷 593-599页

作者： JIN Yuzhen LI Jun ZHU Linhang DU Jiayou JIN Yingzi LIN Peifeng Zhejiang Provincial Key Lab of Modern Textile Machinery & Technology Zhejiang Sci-Tech University 1201 Chu Kochen Honors College Zhejiang University

For the large deformation of the flexible body may cause the fluid grid distortion,which will make the numerical calculation tedious,even to end,the numerical simulation of the flexible body coupling with the fluid is always a tough *** this paper,the flexible body is under two kinds of constrained conditions and the ratio of length-diameter is 1:*** Reynolds number of the airflow is 513,belonging to the area of low Reynolds *** control equations of the coupling of flexible body with airflow are built and the adaptive grid control method is adopted to conduct the three-dimensional numerical simulation of the movement of the flexible *** numerical results show that it is possible to simulate the characteristics of the flexible body's movement in the low Reynolds number airflow when the appropriate control equations are modeled and suitable equation-solving method is *** flexible body would turn over forward along the airflow's diffusion direction,while constrained flexible body in the flow field will make periodic rotation motion along the axis of the flexible body,and the bending deformation is more obvious than that of unconstrained flexible *** preliminary three-dimensional numerical simulation can provide references for further research on the characteristics of the yam movement in high Reynolds number airflow.

关键词： fluid-structure interaction numerical simulation flexible body adaptive grid control method

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Designing Implodable Underwater Systems to Minimize Implosion Pulse Severity

Designing Implodable Underwater Systems to Minimize Implosio...

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Oceans MTS/IEEE Washington (Conference)

作者： L. A. Gish Department of Naval Architecture and Ocean Engineering United States Naval Academy

ISBN: (纸本)9781467393744

Underwater implosion is the rapid and catastrophic collapse of a pressure vessel subjected to external pressure, resulting in a very short but high-pressure pulse in the surrounding water that can potentially damage adjacent structures or personnel. Any system with an internal pressure below external pressure is susceptible to implosion. The pressure pulse from a single implosion has been known to trigger subsequent sympathetic implosions. This work investigates methods of reducing the implosion pulse severity for unstiffened metallic cylindrical pressure vessels. The implosion pulse energy is proportional to the maximum system kinetic energy developed during collapse. It can be reduced by (1) increasing the plastic energy dissipated by the collapsing structure, or (2) increasing the energy required to compress the internal gas. Plastic energy dissipation is increased by triggering higher buckling modes through introduction of geometric imperfections. Numerical simulations show that this technique can reduce implosion pulse energy for a sample cylinder by up to 33%, while reducing the buckling strength of the cylinder by only 0.5%. The energy required for gas compression can be increased by initially pressurizing the interior of the implodable. The benefit from this technique is bounded by other limitations on internal pressure, such as equipment and human survivability. A slight increase in gas compression energy is also realized by substituting a noble gas for air. These techniques can be applied, singly or in combination, to any implodable design to significantly reduce the pulse severity and minimize the risk of sympathetic implosions.

关键词： Implosion Underwater vehicles Cylindrical shell fluid-structure interaction Pressure pulse Sympathetic implosion

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CFD Analysis of a Spring-loaded Pressure Safety Valve during Popping off

CFD Analysis of a Spring-loaded Pressure Safety Valve during...

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14th International Conference on Pressure Vessel Technology（ICPVT-14）

作者： Xueguan Song Lintao Wang Youngchul Park Wei Sun Dalian University of Technology

Many industrial engineering problems require fluid-structure interaction(FSI) analysis and dynamics analysis to improve functionality or operational *** such problem is the popping off of pressure safety valve(PSV) widely used in pressure vessels and *** off of a spring-loaded pressure safety valve(PSV) is crucial to prevent the pressure vessel or pipe from ***'s difficult to observe the dynamics of the valve disc as well as the flow characteristics through the small chamber between the valve disc and valve seat over such a remarkable short period in the *** address this issue,a transient computational fluid dynamics(CFD) model with moving grid technique has been presented in this *** structure grid has been generated over the whole flow domain to ensure that the valve disc can move freely and continuously without negative volume *** types of time-dependent overpressure are given to simulate the popping of the PSV under different overpressure *** parameters such as the displacement of the disc,fluid force on the disc and the blowdown value are monitored to see their influence on the popping of me *** results are helpful to improve the popping action of the valve in design stage,and demonstrate the availability and efficiency of using transient CFD simulation in the popping analysis of spring-loaded PSV.

关键词： Pressure safety valve fluid-structure interaction popping Off CFD transient analysis moving grid.

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SIMULATION ANALYSIS OF DEFORMATION AND STRESS OF TRACHEAL AND MAIN BROCHIAL WALL FOR SUBJECTS WITH LEFT PULMONARY ARTERY SLING

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JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2015年第6期15卷

作者： Qi, Shouliang Li, Zhenghua Yue, Yong Van Triest, Han J. W. Kang, Yang Qian, Wei Northeastern Univ Sinodutch Biomed & Informat Engn Sch Shenyang 110167 Peoples R China Northeastern Univ Key Lab Med Imaging Comp Minist Educ Shenyang 110819 Peoples R China China Med Univ Shengjing Hosp Dept Radiol Shenyang 110004 Peoples R China Univ Texas El Paso Coll Engn El Paso TX 79968 USA

Left pulmonary artery sling (LPAS) is a kind of severe congenital anomaly, where the stenoses usually occur at trachea and main bronchi for the external compression of the artery sling. Computed tomography (CT) images can provide accurate morphological analysis, but the airflow and its effects on the airway wall are unknown and seldom investigated. In the present study, a uni-directional coupling fluid-structure interaction (UCFSI) method is employed to simulate the deformation and stress of tracheal and main bronchial wall for four LPAS subjects and one health control. Much higher airflow velocity is observed for LPAS subjects due to the stenosis, and the deformation and equivalent stress of airway wall are about 50-900 and 901000 times of the health control, respectively. The direction of tracheal shift may be related to the airway shape, and is opposite to the net reaction force. The influences of inlet flow velocity and wall thickness on the deformation and stress are significant and their relationship is nonlinear. These results suggest that the UCFSI simulation is helpful for the quantitative analysis on the deformation and stress of the airway wall and better understanding of LPAS mechanism.

关键词： fluid-structure interaction computational fluid dynamics left pulmonary artery sling deformation

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