检索结果-内蒙古大学图书馆

2D dynamical efficiency of a swimfin: a fluid-structure interaction approach

Computer Methods in Biomechanics & Biomedical Engineering 2009年第SUP1期12卷 53-54页

作者： Bideau, N. nicolas.bideau@univ-rennes1.fr Mahiou, B. Monier, L. Bideau, B. Nicolas, G. Razafimahery, F. Rakotomanana, L. IRMAR UMR 6625 du CNRS Université de Rennes 1 35042 Rennes Cedex France Laboratoire M2S Université de Rennes 2 ENS Cachan 35044 Rennes Cedex France

The article presents a study that examined the use of a two-dimensional (2D) fluid-structure model to quantify the energy transfer between the fin and the water. It cites that the natural frequencies were compared to quantify the added mass effect on the fin. Results have shown that the added mass of surrounding water has an impact on eigenfrequencies and modal shapes.

关键词： finite element method fluid-structure interaction propulsive efficiency

来源：评论

学校读者我要写书评

暂无评论

Coupling Function and Mechanism of the Bionic Coupling Functional Surface (BCFS) Caused by the Dual Factors of Form and Flexible Material

Coupling Function and Mechanism of the Bionic Coupling Funct...

引用

4th International Conference of Bionic Engineering (ICBE 2013)

作者： Tian, Limei Wang, Yinci Gao, Zhihua Bu, Zhaoguo Ren, Luquan Gao, Jiuhao Jilin Univ Minist Educ Key Lab Bion Engn 5988 Renmin St Changchun 130022 Peoples R China FAW Wuxi Fuel Inject Equipment Res Inst Wuxi 214063 Peoples R China First Engn Sci Res Inst Gen Armaments Dept Wuxi 214035 Peoples R China

ISBN: (纸本)9783037859322

Some living creatures have special structures on their body surfaces, such as smooth and elastic epidermis with subcutaneous tissue having non-smooth structures under certain conditions. The elastic epidermis coupled with non-smooth structures has a special function called bio-coupling functional surface. Imitating this functional surface and applying it in engineering has a potential to solve some engineering problems. Based on the simulation method of fluid-structure interaction (FSI), simulation calculation of the bionic functional surface coupled by the two factors, form and flexible materials was conduct using ADINA software. A viscous and weakly compressible transient flow was selected as a working medium, a discrete solver was selected in numerical calculation and the basic kappa - epsilon model was chosen as a turbulence model. It is assumed that the coupling surface of the form/flexible materials results is large deformation and large strain. The boundary condition of fluid-structure interaction was set as the calculation surface. The simulation results showed that this coupling is a dynamic process, in which the two factors (form and flexible materials) are influenced by the flow field. As the pressure and velocity of the flow field increase, the coupling process changes from partial coupling to complete coupling, the pressure drag decreased due to the maximum effective stress of bionic coupling surface is very small and the smooth and flexible materials can redistribute pressure by absorbing and releasing energy, the pressure drag thus formed is decreased. Moreover, non-smooth structures (form factor) coupled with flexible materials reduced velocity of working face and minimise energy losses effectively, enabling the bionic coupling surface to reduce drag.

关键词： bionic coupling functional surface fluid-structure interaction efficiency enhancement drag deduction

来源：评论

学校读者我要写书评

暂无评论

Characteristics research of aqueduct under FSI dynamic response

Characteristics research of aqueduct under FSI dynamic respo...

引用

3rd International Conference on Energy, Environment and Sustainable Development (EESD 2013)

作者： Zhu Feng Cao Aiwu Geng Ying Hohai Univ Coll Harbor Coastal & Offshore Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9783037859735

Maximum distribution of hydrodynamic pressure on the flume sidewall were studied in this paper based on the finite element method. It contains the difference comparison of theoretical and numerical formulas, rules of maximum hydrodynamic pressure distribution under regular and irregular incentives, and hydrodynamic pressure changes with different height of bracket below the aqueduct. Studies show that: In the 30m height range, with the rise of bracket, the hydrodynamic pressure grows linearly.

关键词： Aqueduct fluid-structure interaction Finite element Hydrodynamic pressure

来源：评论

学校读者我要写书评

暂无评论

Analytical solution of transient flow in pipe with junction coupling due to hydro-turbine vane motion

Analytical solution of transient flow in pipe with junction ...

引用

2nd International Conference on Advances in Computational Modeling and Simulation (ACMS 2013)

作者： Zhou, Kunxiong Zhang, Lixiang Kunming Univ Sci & Technol Dept Engn Mech Kunming 650500 Peoples R China

ISBN: (纸本)9783037859063

This paper is concerned with an analytical solution of transient flow on the four-equation model in fluid-structure interaction (FSI) for a reservoir-pipe-vane system subjected to a sudden closure of hydro turbine vane. The analytical solution is derived corresponding to the junction coupling based on a vane motion. The result obtained from the analytical solution is used to analyze the coupling features between pipe transient flow and hydro turbine vane motion.

关键词： Water hammer Transient flow Junction coupling fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

Seismic Response Analysis of Free Long-Span Submarine Flexible Pipelines under Earthquakes

Seismic Response Analysis of Free Long-Span Submarine Flexib...

引用

4th International Conference on Civil Engineering, Architecture and Building Materials (CEABM)

作者： Deng, Yu Lin Yu Bian Fan Lei Wuhan Univ Technol Sch Transportat Wuhan 430063 Peoples R China

ISBN: (纸本)9783038351658

Submarine pipelines are described as the lifeblood of offshore oil and it is crucial to ensure the seismic safety of the submarine pipelines. Based on the fluid-structure interaction numerical analysis method and by using finite element software ADINA, the analysis models of the free long-span submarine flexible pipelines under earthquakes were established. By employing dynamic time-history method, the influences of fluid-structure interaction on the seismic response of the submarine pipelines were researched. The results showed that the peak normal stress and the peak displacement of submarine pipelines' mid-span considering the influences of the fluid-structure interaction are greater than those without considering the influences, and the influences of the fluid-structure interaction on the seismic response of the submarine pipelines will increase with the increase of the submarine pipelines' diameter.

关键词： submarine flexible pipeline seismic response fluid-structure interaction dynamic analysis

来源：评论

学校读者我要写书评

暂无评论

Finite Element Model of Human Cochlea Considering of the Helicotrema Size

Finite Element Model of Human Cochlea Considering of the Hel...

引用

International Conference on Mechanical, Material Engineering (MME 2013)

作者： Xu, Li Fu Ta, Na Rao, Zhu Shi Tian, Jia Bin Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Inst Vibrat Shock & Noise Shanghai 200240 Peoples R China

ISBN: (纸本)9783037859285

A 2-D finite element model of human cochlea is established in this paper. This model includes the structure of oval window, round window, basilar membrane and cochlear duct which is filled with fluid. The basilar membrane responses are calculated with sound input on the oval window membrane. In order to study the effects of helicotrema on basilar membrane response, three different helicotrema dimensions are set up in the FE model. A two-way fluid-structure interaction numerical method is used to compute the responses in the cochlea. The influence of the helicotrema is acquired and the frequency selectivity of the basilar membrane motion along the cochlear duct is predicted. These results agree with the experiments and indicate much better results are obtained with appropriate helicotrema size.

关键词： cochlea helicotrema basilar membrane finite element model fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

MODELLILNG OF interaction BETWEEN SUSPENSION AND structure IN A TUMBLING MILL 11

MODELLILNG OF INTERACTION BETWEEN SUSPENSION AND STRUCTURE I...

引用

11th World Congress on Computational Mechanics (WCCM) / 5th European Conference on Computational Mechanics (ECCM) / 6th European Conference on Computational fluid Dynamics (ECFD)

作者： Hammarberg, S. Larsson, S. Jonsen, P. Lulea Tekn Univ Dept Engn Sci & Math S-97187 Lulea Sweden

ISBN: (纸本)9788494284472

fluid-structure interaction (FSI) and free-surface flow problems occur in many engineering applications. FSI problems includes interaction of deformable and or moveable structures with surrounding or internal fluid flows. Development of accurate methods to simulate FSI would have many benefits in numerous industrial applications e.g. reducing the need for experimental testing and recent efforts have been made in this field. Hydro power turbines, aerodynamics of wind power turbines and lubrication of mechanical components are examples of applications where FSI play an important part. This work investigates the possibility to use the new Incompressible Computational fluid Dynamics (ICFD) solver implemented in the R7.1.0 version of LS-Dyna. The studied case is a tumbling mill, used in the mining industry, partly filled with different fluids. The interaction between the rigid cylinder casing and the fluid inside the mill, but also the behaviour of the free surface are studied topics. Modelling of wet milling is a complex multi-physics problem and usually a combination of different numerical methods are used. One of the main purposes of this work was to investigate how well the ICFD solver in LS-Dyna could handle free surfaces and reproduce the behaviour of two different fluids. Different rotational velocities for the grinding mill and pulp viscosity were evaluated. From performed simulations a comparison between experimentally measured torque on the mill casing and torque calculated with the ICFD-solver was done. For lower rotational velocities the results show closer agreement, with increasing velocity and dynamic viscosity the error also increase. The ICFD-solver shows good potential in handling FSI and free-surface problems when it comes to results and calculation time. Compared to other previously used methods for solving complex FSI problems, such as smoothed particle hydrodynamics (SPH), the ICFD-solver can be beneficial with shorter computational time.

关键词： fluid-structure interaction Free surface ICFD Tumbling mill

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation of the interaction between Surface Waves and Horizontal Plates at Free Surface

引用

3rd International Conference on Machinery Electronics and Control Engineering (ICMECE 2013)

作者： Wu, Jingping Xu, Ling Mei, Tianlong Yi, Shuai Wang, Liqun Wuhan Univ Technol Sch Transportat Wuhan 430070 Hubei Peoples R China

ISBN: (纸本)9783037859032

A horizontal plates flock like Lotus leaves can attenuate incident surface water waves. This paper tries to simulate a numerical wave tank by FLUENT CFD software using k-omega turbulence model in a two-dimensional domain. And a 2nd-order Stokes wave is made by the boundary wave-making method, and attenuated by three kinds of horizontal plates flocks with different relative lengths (flock length/wave length). A flock of horizontal plates consists of multiple plates interspersed with gaps. However the leaves have both movement and deformation in waves, giving rise to a difficult fluid-structure interaction problem. Here a simpler case is studied, involving rigid, infinitely thin plates fixed at the still water level. The Four time steps are tried to find such appropriate time step-not only to make satisfied wave contour but also to decrease computing time. The simulations show that the amplitude of the transient wave decreases while the relative breadth increases. The velocity vectors of water partical near the attenuator are showed, and the velocities behind the attenuator do not follow a perfect wave velocity distribution.

关键词： numerical wave tank breakwater fluid-structure interaction wave attenuation

来源：评论

学校读者我要写书评

暂无评论

Pressure wave propagation in full-body arterial models: A gateway to exploring aging and hypertension

Pressure wave propagation in full-body arterial models: A ga...

引用

23rd International Congress of Theoretical and Applied Mechanics (ICTAM)

作者： Figueroa, C. Alberto Humphrey, Jay D. Kings Coll London St Thomas Hosp London SE1 7EH England Yale Univ New Haven CT USA

It is now widely recognized that changes in arterial wall properties have a significant impact on hemodynamic indices such as pressure pulse amplification and pulse wave velocity. It is also becoming increasingly evident that changes in wall mechanics may progress both spatially and temporally (e.g., in age-related arterial stiffening and hypertension). Modeling studies can help delineate how local changes in stiffness affect global hemodynamics. Previously, several modeling studies have investigated blood and pressure in full-body scale arterial trees using one-dimensional formulations. In this paper, we work towards the goal of deepening our understanding of arterial pulse propagation phenomena while incorporating detailed information on localized hemodynamics. To this end, we present the first multi-scale simulation of unsteady blood flow and pressure within a three-dimensional deformable full-body arterial network. This simulation framework builds upon previous advances in fluid-structure interaction, multi-scale outflow boundary conditions, and perivascular tissue support modeling. We consider application examples featuring realistic distributions of spatially and temporally varying mechanical properties. Simulations successfully demonstrate realistic pressure and flow waveforms, regional blood flow distribution, pressure pulse amplification and pulse wave velocity. (C) 2013 Published by Elsevier Ltd.

关键词： pulse wave velocity fluid-structure interaction hypertension full-body arterial model three-dimensional hemodynamics

来源：评论

学校读者我要写书评

暂无评论

WAVELET-BASED COMPUTATIONAL MODELING OF WALL-BOUNDED TURBULENT FLOWS WITH LAGRANGIAN VARIABLE THRESHOLDING 11

WAVELET-BASED COMPUTATIONAL MODELING OF WALL-BOUNDED TURBULE...

引用

11th World Congress on Computational Mechanics (WCCM) / 5th European Conference on Computational Mechanics (ECCM) / 6th European Conference on Computational fluid Dynamics (ECFD)

作者： De Stefano, Giuliano Nejadmalayeri, Alireza Vasilyev, Oleg V. Seconda Univ Napoli DIII Via Roma 29 I-81031 Aversa Italy Univ Colorado DME Boulder CO 80309 USA

ISBN: (纸本)9788494284472

The wavelet-based computational modeling of wall-bounded turbulent flows with Lagrangian variable thresholding is introduced. The eddy capturing approach exploits a wavelet-collocation parallel solver, where the flow geometry is enforced through Brinkman volume-penalization. Adaptive large-eddy simulation supplied with the one-equation localized dynamic kinetic-energy-based model is performed, where the effective turbulence resolution is locally controlled by the wavelet filtering threshold evolution. Numerical experiments are conducted for incompressible turbulent flow around a square cylinder at moderately high Reynolds number.

关键词： Turbulence Wavelet thresholding filter Large eddy simulation Volumepenalization fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：