检索结果-内蒙古大学图书馆

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

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Designing Implodable Underwater Systems to Minimize Implosion Pulse Severity

Designing Implodable Underwater Systems to Minimize Implosio...

引用

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

来源：评论

学校读者我要写书评

暂无评论

The application of immersed boundary-lattice Boltzmann method in vortex-induced vibration

The application of immersed boundary-lattice Boltzmann metho...

引用

Fifth Asia International Symposium on Mechatronics (AISM 2015)

作者： K. Zhou J.K. Liu W.S. Chen Harbin Institute of Technology Harbin Heilongjiang CN

Aiming at vortex-induced vibration problem, immersed boundary-lattice Boltzmann method (IB-LBM) is adopted in the paper. In order to establish a baseline for comparison and verify the precision of the algorithm, a uniform flow past a rigid cylinder at Re=200 is simulated first and the numerical results are compared with the results of other documents. The motion of the elastic-supported cylinder is modelled by a spring-damper-mass system and the motion equation is solved using the Runge-Kutta method. The cylinder is only allowed to vibrate in transverse direction and the Reynolds number is kept at 200. Besides, the lift and drag coefficients of the cylinder, the displacement of the cylinder and the vortex pattern in the wake are extracted at different natural frequencies, and on this basis the dynamic response characteristic of the cylinder is studied. As the natural frequency reduces, the time history of fluctuating hydrodynamic coefficients characterized by `beating' is presented, and the phase between lift force and the crossflow displacement undergoes a change from the `in-phase' mode to the `out-of-phase' mode. The results further show that the cylinder oscillations could be as large as 0.53 diameter under certain natural frequency.

关键词： fluid-structure interaction Immersed Boundary Method Lattice Boltzmann Method Vortex-induced Vibration Cylinders Natural frequencies lattice Boltzmann methods Drag coefficient fluid-solid interactions time history Vibration IMMERSING lift force Reynolds number

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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.

来源：评论

学校读者我要写书评

暂无评论

Dynamic Stress Analysis of Sewage Centrifugal Pump Impeller Based on Two-way Coupling Method

引用

Chinese Journal of Mechanical Engineering 2014年第2期27卷 369-375页

作者： PEI Ji YUAN Shouqi YUAN Jianping Research Center of Fluid Machinery Engineering and Technology Jiangsu University

Current research on the operational reliability of centrifugal pumps has mainly focused on hydrodynamic instability. However, the interaction between the fluid and structure has not been sufficiently considered; this interaction can cause vibration and dynamic stress, which can affect the reliability. In this study, the dynamic stresses in a single-blade centrifugal pump impeller are analysed under different operating conditions; the two-way coupling method is used to calculate the fluid-structure interaction. Three-dimensional unsteady Reynolds-averaged Navier-Stokes equations are solved with the SST k-o9 turbulence model for the fluid in the whole flow passage, while transient structure dynamic analysis is used with the finite element method for the structure side. The dynamic stresses in the rotor system are computed according to the fourth strength theory. The stress results show that the highest stress is near the loose bearing and that the equivalent stress increases with the flow rate because the dynamic stresses are closely related to the pressure load. The stress distributions on the blade pressure side, suction side, leading edge, and trailing edge are each analysed for different flow rates; the highest stress distribution is found on the pressure side. On the blade pressure side, a relatively large stress is found near the trailing edge and hub side. Based on these results, a stress distribution prediction method is proposed for centrifugal pumps, which considers the interaction between the fluid and structuxe. The method can be used to check the dynamic stress at different flow rates when optimising the pump design to increase the pump reliability.

关键词： numerical analysis fluid-structure interaction single-blade centrifugal pump dynamic stress

来源：评论

学校读者我要写书评

暂无评论

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

引用

JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2015年第6期15卷 1540053-1540053页

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

来源：评论

学校读者我要写书评

暂无评论

Suppress sloshing impact loads with an elastic structure

Suppress sloshing impact loads with an elastic structure

引用

第二十七届全国水动力学研讨会

作者： LIAO Kang-ping HU Chang-hong MA Qing-wei College of Ship Building Engineering Harbin Engineering University Research Institute for Applied Mechanics Kyushu University

In rough sea conditions,free floating ships or platforms often suffer from large-amplitude *** the ships or platforms with partially-filled tank(s),such as LNG carriers and FPSO vessels,the large-amplitude motion can result in sloshing *** impact loads induced by the sloshing can result in structural ***,it is important to reduce the sloshing impact loads for the ship or platform *** this paper,a rectangular sloshing tank with an elastic structure is *** elastic structure is used to suppress the sloshing impact *** coupled FDM-FEM method,proposed by the authors,is applied to analyzed the influence of the elastic structure motion on the impact *** the coupled FDM-FEM method,the Finite Difference Method(FDM)based on a fixed regular Cartesian grid system is applied for solving flow field,and the FEM based on a Lagrangian grid system is used to solve structural deformation.A volume weighted scheme based on Immersed Boundary(IB)method is adopted to couple the flow solver and the structural *** of impact loads between cases with and without elastic baffle are carried *** show that the elastic structure motion has great influence on the impact loads.

关键词： Sloshing impact loads Coupled FDM-FEM method Elastic structure fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

Empirical Equations for Planing Hull Bottom Pressures

引用

JOURNAL OF SHIP RESEARCH 2014年第4期58卷 185-200页

作者： Morabito, M. G. US Naval Acad Annapolis MD 21402 USA

Recently there has been increasing interest in the fluid structure interaction problem of planing hull bottom structure during slamming events. Significant work has been done in estimating the bottom pressures that occur during a slam and incorporating this into structural models of planing craft. In this article, empirical equations for the pressure distribution on prismatic planing hulls are developed, including both hydrostatic and hydrodynamic effects, deadrise variation, trim, and wetted length. The empirical method is based on relevant experimental measurements of planing hull bottom pressures that have been made over an 80-year period. This analysis may readily be extended to the impact problem by substitution of an equivalent planing velocity, which is discussed in the article. The end result is a closed form solution for bottom pressures on prismatic planing craft that can be rapidly calculated using a simple spreadsheet. The method is applicable for deadrise angles from 0 degrees to 40 degrees, trim angles up to 30 degrees, and wetted lengths up to five beams. This wide range of parameters is significantly larger than most current models. The empirical method is modular, allowing for substitution of more accurate formulae as more data become available in the future.

关键词： planing hull pressures fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

A systematic comparison between 1-D and 3-D hemodynamics in compliant arterial models

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2014年第2期30卷 204-231页

作者： Xiao, Nan Alastruey, Jordi Figueroa, C. Alberto Kings Coll London Dept Biomed Engn London England Stanford Univ Dept Bioengn Stanford CA 94305 USA

We present a systematic comparison of computational hemodynamics in arteries between a one-dimensional (1-D) and a three-dimensional (3-D) formulation with deformable vessel walls. The simulations were performed using a series of idealized compliant arterial models representing the common carotid artery, thoracic aorta, aortic bifurcation, and full aorta from the arch to the iliac bifurcation. The formulations share identical inflow and outflow boundary conditions and have compatible material laws. We also present an iterative algorithm to select the parameters for the outflow boundary conditions by using the 1-D theory to achieve a desired systolic and diastolic pressure at a particular vessel. This 1-D/3-D framework can be used to efficiently determine material and boundary condition parameters for 3-D subject-specific arterial models with deformable vessel walls. Finally, we explore the impact of different anatomical features and hemodynamic conditions on the numerical predictions. The results show good agreement between the two formulations, especially during the diastolic phase of the cycle.

关键词： arterial hemodynamics fluid-structure interaction pulse wave propagation Windkessel full aorta model spatially varying mechanical properties outflow boundary condition estimation

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：