检索结果-内蒙古大学图书馆

A Wind Tunnel Setup for fluid-structure interaction Measurements Using Optical Methods

SENSORS 2022年第13期22卷 5014页

作者： Nietiedt, Simon Wester, Tom T. B. Langidis, Apostolos Kroeger, Lars Rofallski, Robin Goering, Martina Kuhn, Martin Guelker, Gerd Luhmann, Thomas Jade Univ Appl Sci Inst Appl Photogrammetry & Geoinformat IAPG Ofener Str 16-19 D-26121 Oldenburg Germany Carl von Ossietzky Univ Oldenburg ForWind Inst Phys Kupkersweg 70 D-26129 Oldenburg Germany

The design of rotor blades is based on information about aerodynamic phenomena. An important one is fluid-structure interaction (FSI) which describes the interaction between a flexible object (rotor blade) and the surrounding fluid (wind). However, the acquisition of FSI is complex, and only a few practical concepts are known. This paper presents a measurement setup to acquire real information about the FSI of rotating wind turbines in wind tunnel experiments. The setup consists of two optical measurement systems to simultaneously record fluid (PIV system) and deformation (photogrammetry system) information in one global coordinate system. Techniques to combine both systems temporally and spatially are discussed in this paper. Furthermore, the successful application is shown by several experiments. Here, different wind conditions are applied. The experiments show that the new setup can acquire high-quality area-based information about fluid and deformation.

关键词： dynamic metrology photogrammetry PIV wind tunnel fluid-structure interaction wind turbine

来源：评论

学校读者我要写书评

暂无评论

The pathogenesis of superior mesenteric artery dissection: An in-depth study based on fluid-structure interaction and histology analysis

引用

COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022年 226卷 107187-107187页

作者： Jia, Zhongzhi Mei, Junhao Ding, Wei Zhao, Xi Gong, Wen Yu, Haiyang Qin, Lihao Piao, Zeyu Chen, Wenhua Tang, Liming Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Intervent & Vasc Surg Changzhou 213003 Peoples R China Nanjing Med Univ Affiliated Wuxi Peoples Hosp Dept Intervent Radiol Wuxi 214023 Peoples R China United Imaging Healthcare Cent Res Inst Shanghai 201807 Peoples R China Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Pathol Changzhou 213003 Peoples R China Soochow Univ Affiliated Hosp 3 Dept Intervent Radiol Changzhou 213000 Peoples R China Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Gastrointestinal Surg Changzhou 213003 Peoples R China

Objective: To explore the role of hemodynamic factors in the occurrence of superior mesenteric artery (SMA) dissection (SMAD) using a fluid-structure interaction (FSI) simulation method, and to identify histopathologic changes occurring in the wall of the SMA. Methods: A total of 122 consecutive patients diagnosed with SMAD and 122 controls were included in this study. Hemodynamic factors were calculated using a FSI simulation method. Additionally, SMA spec-imens obtained from 12 cadavers were stained for histological quantitative ***: The mean aortomesenteric angle (59.7 degrees +/- 21.4 degrees vs 48.2 degrees +/- 16.8 degrees;p < .001) and SMA maximum curvature (0.084 +/- 0.078 mm-1 vs 0.032 +/- 0.023 mm -1;p < .001) were higher in SMAD patients than the controls. Larger aortomesenteric angles and SMA curvatures were associated with higher and more concentrated wall shear stress at anterior wall of the SMA curve segment, co-located with the dissec-tion origins. The mean thickness of media (325.18 +/- 44.87 mu m vs 556.92 +/- 138.32 mu m;p = .003) was thinner in the anterior wall of the SMA curve than in the posterior wall. The area fractions of elastin (17.96% +/- 3.36% vs 27.06% +/- 4.18%;p = .002) and collagen (45.43% +/- 6.89% vs 55.57% +/- 7.57%;p = .036) were lower in anterior wall of the SMA curve than in posterior ***: Increased aortomesenteric angle and SMA curvature are risk factors for SMAD. Both of these factors can cause local hemodynamic abnormalities, which can lead to histopathologic changes in anterior wall of SMA.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ )

关键词： Mesenteric artery Dissection fluid-structure interaction Computed tomography arteriography

来源：评论

学校读者我要写书评

暂无评论

Experimental and computational fluid-structure interaction analysis and optimization of deep-V planing-hull grillage panels subject to slamming loads - Part I: Regular waves

引用

MARINE structureS 2022年 85卷

作者： Diez, Matteo Lee, Evan J. Harrison, Emily L. Powers, Ann Marie R. Snyder, Lawrence A. Jiang, Minyee J. Bay, Raymond J. Lewis, Richard R. Kubina, Eric R. Mucha, Philipp Stern, Frederick Inst Marine Engn CNR INM Natl Res Council Rome Italy Naval Surface Warfare Ctr Carderock Div NSWCCD Bethesda MD USA Siemens Digital Ind Software Inc Torrance CA USA Univ Iowa IIHR Hydrosci & Engn Iowa City IA USA

The paper presents the multidisciplinary design optimization (MDO) of a deep-V planing-hull grillage panel subject to slamming loads in regular waves. Namely, fluid structure interaction (FSI) experiments, computations, and MDO are presented and discussed for a bottom-panel grillage of a high-speed Generic Prismatic Planing Hull in regular waves. Computations are per-formed via one-and tightly coupled two-way computational fluid and structural dynamics (CFD/ CSD) using unsteady Reynolds-averaged Navier-Stokes equation solvers to compute the hydro-dynamic loads. The structural assessment of the original/traditional grillage is performed using a fully parametric finite element (FE) model, showing the significant effects of the FE boundary conditions on the structural response. Firstly, an equivalent static and uniform load is identified via CFD and applied during optimization using two design spaces. The selected optimized design provides a grillage-weight reduction of 35% and an overall factor of safety equal to 1.72. The optimized design presents variations of stiffeners dimensions across the grillage with the largest stiffener at the middle, distributing the stress more uniformly among the stiffeners. The effects of one-versus two-way coupling are negligible for both the original/traditional and optimized grillages (as per the hydroelasticity factor R), whereas the effects of FE boundary conditions on the analysis and optimization outcomes are significant, confirming the need for proper calibration of the FE model in FSI and MDO studies. Secondly, MDO is performed with a dynamic load applied via one-way coupling FSI. An additional 5% weight reduction is identified, achieving a 40% weight reduction compared to the traditional grillage. The optimal design presents the largest stiffener close to the keel, which is significantly different than the design obtained for uniform/static load. Comparison of computational and experimental data is very good, indicating that th

关键词： fluid-structure interaction Slamming Planing hulls Grillage panels Multidisciplinary design optimization Validation

来源：评论

学校读者我要写书评

暂无评论

Component quantification of aortic blood flow energy loss using computational fluid-structure interaction hemodynamics

引用

COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022年 221卷 106826-106826页

作者： Qiao, Yonghui Luo, Kun Fan, Jianren Zhejiang Univ State Key Lab Clean Energy Utilizat 38 Zheda Rd Hangzhou 310027 Peoples R China Zhejiang Univ Shanghai Inst Adv Study Shanghai Peoples R China

Background and objectives: The aorta serves as the main tube of the human blood circulation system. Energy loss (EL) occurs when blood flows through the aorta and there may be a potential correlation between EL and aortic diseases. However, the components of blood flow EL are still not fully understood. This study aims to quantitatively reveal the EL components in healthy and diseased aortas. Methods: We construct an idealized healthy aorta and three idealized representative diseased aortas: aortic aneurysm, coarctation of the aorta, and aortic dissection. Computational hemodynamic studies are carried out by using the fluid-structure interaction simulation framework. Results: Four kinds of EL components: viscous friction, turbulence dissipation, wall deformation, and local lesion are firstly acquired in healthy and diseased aortas based on the high-resolution blood flow information. Viscous friction contributes most to the EL (45.69%-57.22%). EL caused by the deformation of the aortic wall ranks second (15.18%-33.12%). The proportions of turbulence dissipation and local lesion depend on individual geometric characteristics. Besides, the buffering efficiency of the healthy and diseased aorta is about 80%. Conclusions: This study quantitatively reports the components of blood flow EL in healthy and diseased aortas, the finding may provide novel insights into the pathogenesis of aortic diseases. (C) 2022 Published by Elsevier B.V.

关键词： Computational hemodynamics Energy loss Viscosity friction Turbulence dissipation fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

A block-based adaptive particle refinement SPH method for fluid-structure interaction problems

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年 399卷

作者： Gao, Tianrun Qiu, Huihe Fu, Lin Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Kowloon Clear Water Bay Hong Kong Peoples R China Hong Kong Univ Sci & Technol Dept Math Kowloon Clear Water Bay Hong Kong Peoples R China Hong Kong Univ Sci & Technol Shenzhen Res Inst Shenzhen Peoples R China

The multi-resolution method, e.g., the Adaptive Particle Refinement (APR) method, has been developed to increase the local particle resolution and therefore the solution quality within a pre-defined refinement zone instead of using a globally uniform resolution for Smoothed Particle Hydrodynamics (SPH). However, sometimes, the targeted zone of interest can be varying, and the corresponding topology is very complex, thus the conventional APR method is not able to track these characteristics adaptively. In this study, a novel Block-based Adaptive Particle Refinement (BAPR) method is developed, which is able to provide the necessary local refinement flexibly for any targeted characteristic, and track it adaptively. In BAPR, the so-called activation status of the block array defines the refinement regions, where the transition and activated zones are determined accordingly. A regularization method for the generated particles in the newly activated blocks is developed to render an isotropic distribution of these new particles. The proposed method has been deployed for simulating fluid-structure interaction

关键词： Smoothed particle hydrodynamics fluid-structure interaction Multi -resolution method Adaptive refinement method

来源：评论

学校读者我要写书评

暂无评论

A novel coupled Riemann SPH-RKPM model for the simulation of weakly compressible fluid-structure interaction problems

引用

OCEAN ENGINEERING 2022年 266卷

作者： Xue, Bing Wang, Shi-Ping Peng, Yu-Xiang Zhang, A-Man Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China Sun Yat Sen Univ Sch Marine Engn & Technol Zhuhai 519082 Peoples R China

This paper established a novel Riemann SPH-RKPM fluid-structure interaction numerical model, which is more stable and has lower dissipation than the traditional method. Firstly, an improved dissipation limiter is proposed and applied to Riemann SPH to simulate fluid motion, effectively reducing dissipation while ensuring computational stability. Secondly, an improved method to treat the fluid-structure interaction (FSI) force is proposed, which introduces the Riemann solver into the normal flux method to solve the FSI force. This improvement ensures the smoothness of the flow field pressure at the fluid-structure interface and then improves the stability of the violent impact fluid-structure interaction problem. This paper used the RKPM to solve the large deformation of the structure. Several benchmark tests and one improved example are used to verify the convergence and accuracy of the numerical model. The results calculated in this paper agree with experiment and other numerical methods, proving that the Riemann SPH-RKPM fluid-structure interaction numerical model is effective and has high accuracy.

关键词： fluid-structure interaction Riemann SPH RKPM Normal flux method Elastic structure

来源：评论

学校读者我要写书评

暂无评论

A special numerical method for fluid-structure interaction problems subjected to explosion and impact loading

引用

Science China(Technological Sciences) 2020年第7期63卷 1280-1292页

作者： NING JianGuo MENG FanLin MA TianBao XU XiangZhao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

A three-dimensional(3D) embedded Eulerian-Lagrangian method is proposed to simulate the 3D fluid-structure interaction(FSI) problems subjected to explosion and impact loading. This method achieves a high-quality calculation of fluid and structure deformation by adding Lagrangian particles to Eulerian grids. The overall computational domain is solved by the Eulerian method, and the Lagrangian particles with specified volume and influence domains are used to track structural deformations. The bidirectional mapping of physical quantities is achieved using the weighted average of the influence domain, which are based on the topological relationship between Eulerian grids and Lagrangian particles. Then, the data dependence solution and parallel algorithm realization are presented for the large-scale numerical calculations of explosion and impact problems. Additionally, the corresponding parallel program is developed based on the message passing interface(MPI) standard, and the parallel efficiency of parallel hydrocode are tested. The numerical results of typical explosion and impact problems are compared with corresponding experimental data to verify the effectiveness of the method. These comparisons show that the embedded EulerianLagrangian method successfully combine the advantages of both the Eulerian and Lagrangian methods to efficiently calculate the processes of large deformation and dynamic damage to the materials. The results presented in this work provide a useful reference point for further research on explosion and impact problems.

关键词： explosion and impact embedded Eulerian-Lagrangian method fluid-structure interaction numerical simulation

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of thin-walled piezoelectric energy harvesters immersed in flow using monolithic fluid-structure interaction

引用

FINITE ELEMENTS IN ANALYSIS AND DESIGN 2022年 206卷

作者： Shang, Lan Hoareau, Christophe Zilian, Andreas Univ Luxembourg Dept Engn Esch Sur Alzette Luxembourg Lab Mecan Struct & Syst Couples LMSSC Conservatoire Natl arts & Metiers Cnam Paris France

A monolithic numerical scheme for fluid-structure interaction with special interest in thin-walled piezoelectric energy harvesters driven by fluid is proposed. Employing a beam/shell model for the thin-walled structure in this particular application creates a FSI problem in which an (n-1)-dimensional structure is embedded in an n dimensional fluid flow. This choice induces a strongly discontinuous pressure field along the moving fluid-solid interface. We overcome this challenge within a continuous finite element framework by a splitting-fluid-domain approach. The governing equations of the multiphysics problem are solved in a simultaneous fashion in order to reliably capture the main dynamic characteristics of the strongly-coupled system that involves a large deformation piezoelectric composite structure, an integrated electric circuit and an incompressible viscous fluid. The monolithic solution scheme is based on the weighted residuals method, with the boundary-fitted finite element method used for the discretization in space, and the generalized-? method for discretization in time. The proposed framework is evaluated against reference data of two popular FSI benchmark problems. Two additional numerical examples of flow-driven thin-walled piezoelectric energy harvesters demonstrate the feasibility of the framework to predict controlled cyclic response and limit-cycle oscillations and thus the power output in typical operational states of this class of energy harvesting devices.

关键词： fluid-structure interaction Monolithic coupling Thin-walled piezoelectric structure Energy harvester Pressure discontinuity

来源：评论

学校读者我要写书评

暂无评论

A strongly coupled immersed boundary method for fluid-structure interaction that mimics the efficiency of stationary body methods

引用

JOURNAL OF COMPUTATIONAL PHYSICS 2022年 454卷

作者： Nair, Nirmal J. Goza, Andres Univ Illinois Dept Aerosp Engn Urbana IL 61801 USA

Strongly coupled immersed boundary (IB) methods solve the nonlinear fluid and structural equations of motion simultaneously for strongly enforcing the no-slip constraint on the body. Handling this constraint requires solving several large dimensional systems that scale by the number of grid points in the flow domain even though the nonlinear constraints scale only by the small number of points used to represent the fluid-structure interface. These costly large scale operations for determining only a small number of unknowns at the interface creates a bottleneck to efficiently time-advancing strongly coupled IB methods. In this manuscript, we present a remedy for this bottleneck that is motivated by the efficient strategy employed in stationary-body IB methods while preserving the favorable stability properties of strongly coupled algorithms-we precompute a matrix that encapsulates the large dimensional system so that the prohibitive large scale operations need not be performed at every time step. This precomputation process yields a modified system of small-dimensional constraint equations that is solved at minimal computational cost while time advancing the equations. We also present a parallel implementation that scales favorably across multiple processors. The accuracy, computational efficiency and scalability of our approach are demonstrated on several two dimensional flow problems. Although the demonstration problems consist of a combination of rigid and torsionally mounted bodies, the formulation is derived in a more general setting involving an arbitrary number of rigid, torsionally mounted, and continuously deformable bodies. (C) 2021 Elsevier Inc. All rights reserved.

关键词： Immersed boundary fluid-structure interaction Strongly coupled Non-stationary bodies Parallel IB

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction simulation of the brain-skull interface for acute subdural haematoma prediction

引用

BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2019年第1期18卷 155-173页

作者： Zhou, Zhou Li, Xiaogai Kleiven, Svein Royal Inst Technol KTH Neuron Engn Stockholm Sweden

Traumatic brain injury is a leading cause of disability and mortality. Finite element-based head models are promising tools for enhanced head injury prediction, mitigation and prevention. The reliability of such models depends heavily on adequate representation of the brain-skull interaction. Nevertheless, the brain-skull interface has been largely simplified in previous three-dimensional head models without accounting for the fluid behaviour of the cerebrospinal fluid (CSF) and its mechanical interaction with the brain and skull. In this study, the brain-skull interface in a previously developed head model is modified as a fluid-structure interaction (FSI) approach, in which the CSF is treated on a moving mesh using an arbitrary Lagrangian-Eulerian multi-material formulation and the brain on a deformable mesh using a Lagrangian formulation. The modified model is validated against brain-skull relative displacement and intracranial pressure responses and subsequently imposed to an experimentally determined loading known to cause acute subdural haematoma (ASDH). Compared to the original model, the modified model achieves an improved validation performance in terms of brain-skull relative motion and is able to predict the occurrence of ASDH more accurately, indicating the superiority of the FSI approach for brain-skull interface modelling. The introduction of the FSI approach to represent the fluid behaviour of the CSF and its interaction with the brain and skull is crucial for more accurate head injury predictions.

关键词： Traumatic brain injury Brain-skull interface fluid-structure interaction Arbitrary Lagrangian-Eulerian Finite element analysis

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

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

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：