检索结果-内蒙古大学图书馆

fluid-structure interaction Simulations of a Wind Gust Impacting on the Blades of a Large Horizontal Axis Wind Turbine

引用

ENERGIES 2020年第3期13卷 509-509页

作者： Santo, Gilberto Peeters, Mathijs Van Paepegem, Wim Degroote, Joris Univ Ghent Dept Electromech Syst & Met Engn Sint Pietersnieuwstr 41 B-9000 Ghent Belgium Univ Ghent Dept Mat Text & Chem Engn Technol Pk Zwijnaarde 907 B-9052 Zwijnaarde Belgium

The effect of a wind gust impacting on the blades of a large horizontal-axis wind turbine is analyzed by means of high-fidelity fluid-structure interaction (FSI) simulations. The employed FSI model consisted of a computational fluid dynamics (CFD) model reproducing the velocity stratification of the atmospheric boundary layer (ABL) and a computational structural mechanics (CSM) model loyally reproducing the composite materials of each blade. Two different gust shapes were simulated, and for each of them, two different amplitudes were analyzed. The gusts were chosen to impact the blade when it pointed upwards and was attacked by the highest wind velocity due to the presence of the ABL. The loads and the performance of the impacted blade were studied in detail, analyzing the effect of the different gust shapes and intensities. Also, the deflections of the blade were evaluated and followed during the blade's rotation. The flow patterns over the blade were monitored in order to assess the occurrence and impact of flow separation over the monitored quantities.

关键词： fluid-structure interaction wind turbine atmospheric boundary layer composite materials gusts wind energy

来源：评论

学校读者我要写书评

暂无评论

A Unified Simulation Framework for fluid-structure-Control interaction Problems with Rigid and Flexible structures

引用

INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS 2022年第1期19卷

作者： Kadapa, Chennakesava Univ Bolton Sch Engn Bolton BL3 5AB England

Vortex-induced vibrations are often unwanted as they can lead to catastrophic failure of the associated structures, warranting countermeasures to mitigate or suppress these vibrations. Due to the nature of nonlinearities in fluid-structure interaction (FSI) problems, analytical solution techniques for FSI problems have limited applicability at best. On the other hand, the numerical solution of vortex-induced vibrations is quite challenging, especially for problems undergoing large structural deformations, let alone the simulation of effective control techniques for suppressing unwanted vibrations. In this work, a robust and computationally efficient simulation framework is proposed to simulate fluid-structure-control interactions problems involving rigid or flexible structures. The effectiveness of the proposed framework in designing effective controller mechanisms for controlling the onset as well as the amplitude of vortex-induced vibrations is illustrated by studying the examples of lock-in of a circular cylinder, galloping of a square body and vortex-induced vibrations of a flexible, lightweight beam under different parameter settings for the controllers.

关键词： fluid-structure interaction vortex-induced vibrations vibration control galloping CutFEM staggered scheme

来源：评论

学校读者我要写书评

暂无评论

fluid structure interaction and heat transfer enhancement with dynamic flexible flow modulator

引用

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 2022年 134卷

作者： Hakim, Md Azizul Ahad, Atiqul Islam Ul Karim, Abrar Saha, Sumon Hasan, Mohammad Nasim Bangladesh Univ Engn & Technol Dept Mech Engn Dhaka 1000 Bangladesh

The present study demonstrates a numerical approach to fluid-structure interaction and associated heat transfer enhancement in a thermal system under the action of a dynamic flexible flow modulator. The thermal system under consideration consists of a vented domain undergoing isoflux heating on the right sidewall, where one end of the modulator is attached at the mid-position in cantilever fashion and undergoes external periodic oscillation at its free end. Galerkin finite element method resolved in Arbitrary Lagrangian-Eulerian approach is adopted to solve the present problem. Effects of amplitude and period of oscillation, as well as the flexibility of the modulator on flow and thermal fields, heat transfer performance, and induced thermo-fluid system characteristics, have been studied. Results obtained in this study reveal the significant impact of external oscillation and flexibility of flow modulator on the degree of fluid-structure interaction as well as thermal performance. Higher amplitude, lower oscillation period, and higher flexibility of the modulator cause enhanced heat transfer. Analysis of power spectrum in the frequency domain indicates that thermal as well as flow oscillation is prominent with higher amplitude and lower oscillation period with growing thermal and flow instabilities. However, both thermal and flow fields eventually become unstable for a very flexible flow modulator.

关键词： fluid-structure interaction Arbitrary Lagrangian-Eulerian approach Flexible flow modulator Mixed convection Vented cavity Nusselt number

来源：评论

学校读者我要写书评

暂无评论

fluid-structure-control interaction simulation of flutter control problems

引用

FINITE ELEMENTS IN ANALYSIS AND DESIGN 2022年 203卷 103722-103722页

作者： Kaneko, Shigeki Yoshimura, Shinobu Univ Tokyo Sch Engn Dept Syst Innovat Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan

Flutter is an aeroelastic instability and can lead to destruction of structures, and thus its control is important in engineering. A flutter control problem is classified into fluid-structure-control interaction (FSCI) problems. Conventionally, flutter control has been investigated using simple FSCI models. However, these models are sometimes insufficient because of their many simplifications (e.g., potential flow, simple geometry, small deformation). For control problems with severe nonlinearity, high-fidelity FSCI modeling, where control systems are incorporated into models that couple computational structural dynamics and computational fluid dynamics, may be required. Although high-fidelity modeling has a high computational cost, recent improvements in machine power have made the use of FSCI models feasible. In FSCI analysis, control forces are dealt with as external forces that can be treated implicitly or explicitly. Although the treatment of control forces influences the damping of controlled systems, it has not been discussed in previous studies on FSCI analysis. Furthermore, there has been no study in which high-fidelity FSCI simulations of flutter control problems were conducted. The present study evaluates the difference between the implicit and explicit treatment of control forces using stability analysis. The stability analysis results show that explicit treatment cannot capture the damping of controlled systems, especially for high-order modes. Therefore, implicit treatment is required for FSCI analysis. In numerical examples, we consider flutter of a cantilevered beam in axial flow. Control laws designed using conventional approaches are tested using the developed FSCI analysis. Reasonable results are obtained in terms of the improvement in flutter velocity.

关键词： Active flutter control fluid-structure-control interaction fluid-structure interaction Finite element method Feedback control

来源：评论

学校读者我要写书评

暂无评论

Bayesian calibration for large-scale fluid structure interaction problems under embedded/immersed boundary framework

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2022年第8期123卷 1791-1812页

作者： Cao, Shunxiang Huang, Daniel Zhengyu CALTECH Dept Mech & Civil Engn Pasadena CA 91125 USA CALTECH Dept Environm Sci & Engn Dept Comp Math Sci Pasadena CA 91125 USA

Bayesian calibration is widely used for inverse analysis and uncertainty analysis for complex systems in the presence of both computer models and observation data. In the present work, we focus on large-scale fluid-structure interaction systems characterized by large structural deformations. Numerical methods to solve these problems, including embedded/immersed boundary methods, are typically not differentiable and lack smoothness. We propose a framework that is built on unscented Kalman filter/inversion to efficiently calibrate and provide uncertainty estimations of such complicated models with noisy observation data. The approach is derivative-free and non-intrusive, and is of particular value for the forward model that is computationally expensive and provided as a black box which is impractical to differentiate. The framework is demonstrated and validated by successfully calibrating the model parameters of a piston problem and identifying the damage field of an aircraft wing under transonic buffeting.

关键词： Bayesian calibration derivative-free optimization embedded immersed boundary method fluid-structure interaction uncertainty quantification

来源：评论

学校读者我要写书评

暂无评论

CFD WITH fluid structure interaction ANALYSIS OF LUNG ALVEOLAR SACS AND ITS APPLICATIONS IN EMPHYSEMA STUDY

CFD WITH FLUID STRUCTURE INTERACTION ANALYSIS OF LUNG ALVEOL...

引用

ASME International Mechanical Engineering Congress and Exposition (IMECE)

作者： Carotenuto, Carlo Orlandi, Francesco Montorsi, Luca Milani, Massimo Univ Modena & Reggio Emilia Reggio Emilia Italy

ISBN: (纸本)9780791887622

Emphysema, a chronic lung disease characterized by respiratory distress and reduced lung function, poses significant challenges. Computational fluid Dynamics (CFD) coupled with fluid structure interaction (FSI) is a highly effective simulation technique that offers valuable insights into the mechanics of lung function and the influence of diseases like emphysema. The intricate lung alveolar sacs play a vital role in gas exchange, and CFD with FSI enables the simulation of mechanical forces that shape and impact their functionality. By employing CFD with FSI, we can simulate the fluid dynamics of emphysema and acquire a comprehensive understanding of disease progression. These simulations allow us to explore the contributions of tidal breathing and surface tension forces. This study has demonstrated through FSI that a lung alveolus affected by pulmonary emphysema, and therefore collapsed, causes reduced air intake with each breath. This is due to the significantly compromised deformability of the alveolar wall. Ultimately, this technique plays a critical role in developing therapeutic interventions to improve patient outcomes.

关键词： Lung Alveolar sac Computation fluid Dynamics fluid-structure interaction pulmonary emphysema

来源：评论

学校读者我要写书评

暂无评论

A high-order finite-difference scheme to model the fluid-structure interaction in pneumatic seismic sources

引用

JOURNAL OF COMPUTATIONAL PHYSICS 2021年 424卷 109849-109849页

作者： Lindeberg, Ludvig Rydin, Ylva Ljungberg Watson, Leighton M.

A high-order accurate finite-difference scheme modeling the fluid-structure interaction inside a pneumatic seismic source is presented. The model consists of two deforming fluid compartments separated by a moving shuttle. The fluid is governed by the 1D Euler equations. Well-posedness of the continuous problem is analyzed and proven in the frozen coefficient case. A stable discretization is derived using summation-by-parts operators with the boundary conditions imposed weakly using the simultaneous-approximation-term method. The theoretical convergence rate of the numerical scheme is verified by numerical experiments. Simulation results are compared to pressure measurements from inside a pneumatic seismic source and capture many of the features observed in the data. (C) 2020 Elsevier Inc. All rights reserved.

关键词： Finite difference methods High-order accuracy Pneumatic seismic sources fluid-structure interaction Euler equations

来源：评论

学校读者我要写书评

暂无评论

A partitioned solution approach for the fluid-structure interaction of thin-walled structures and high-Reynolds number flows using RANS and hybrid RANS-LES turbulence models

引用

AEROSPACE SCIENCE AND TECHNOLOGY 2021年 113卷 106629-106629页

作者： Sekutkovski, Bojan Grbovic, Aleksandar Todic, Ivana Pejcev, Aleksandar Univ Belgrade Fac Mech Engn Kraljice Marije 16 Belgrade Serbia

In this work the partitioned solution approach for the fluid-structure interaction (FSI) of thin-walled structures and high-Reynolds number (Re) flows modeled using Reynolds-Averaged Navier-Stokes (RANS) and hybrid Reynolds-Averaged Navier-Stokes - Large Eddy Simulation (RANS-LES) turbulence models are described. The advanced turbulence modeling is needed to capture very complex fluid phenomena which triggers instabilities of thin-walled structures present in supersonic flow regimes. The finite element (FE) updated Lagrangian formulation (ULF) for the nonlinear elastic solids is used to predict its dynamical behavior. The main contribution addresses to the linear stress-strain relation Laplacian members, which are solved implicitly, on that way decreasing required memory resources and improving solution stability in the same time. The structures of the interest include the vast variety of membranes, curved shells and plates. The instabilities encountering these structures include limit cycle oscillations (LCO), flutter and buckling of the panels. The phenomena appear in everyday engineering practice and a need for the powerful tools to handle such problems is a common goal. Utilization of the unstructured non-regular meshes allows the precise distribution of computational nodes at the physical boundaries of the fluid and solid domains. It is naturally allowing application of the common approach for the fluid-solid interface coupling, as well as classical data interpolation schemes between fluid and solid on the FSI interface. High-Re flows, both 2D (benchmark) and 3D turbulent FSI case are chosen for the validation. Two numerical methods are coupled via a moving boundary treatment, in a staggered way. The proposed coupling method showed a good agreement with the reference test cases. The current FSI framework is developed to serve as a tool for the liquid rocket engine development. (C) 2021 Elsevier Masson SAS. All rights reserved.

关键词： fluid-structure interaction Partitioned approach Finite volume method Finite element method ALE approach Hybrid RANS-LES

来源：评论

学校读者我要写书评

暂无评论

A REVIEW ON UNSTEADY fluid-FLEXIBLE structure interaction

引用

JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING 2022年第2期29卷 43-86页

作者： Sharma, Kamal Raj Dutta, Sushanta Indian Inst Technol Roorkee Dept Mech & Ind Engn Aerodynam Lab Roorkee 247667 Uttarakhand India

The present work reviews the flow interactions of structures with flexible configurations in practical applications. The flow dynamics involved in flexible structures under unsteady aerodynamics and changes in the wake morphology of the attached body are covered in this study. Particle image velocimetry data recorded by the authors in their research are summarized. The similarities be-tween the wake structures of rigid and flexible structures attached to bluff bodies are also explored in this article. The results obtained in this study are useful for researchers who wish to understand flow control over streamlined and bluff bodies using flexible structures. In addition, the flow dy-namics involved in the flight of natural swimmers and fliers can be understood from this review.

关键词： unsteady aerodynamics fluid-structure interaction flexible splitter plate particle image velocimetry (PIV) flexible flapping wing flapping modes

来源：评论

学校读者我要写书评

暂无评论

Prediction of slamming pressure considering fluid-structure interaction. Part II: Derivation of empirical formulations

引用

MARINE structureS 2021年 75卷 102700-102700页

作者： Dac Dung Truong Jang, Beom-Seon Ju, Han-Baek Han, Sang Woong Seoul Natl Univ Res Inst Marine Syst Engn Dept Naval Architecture & Ocean Engn 01 Gwanak Ro Seoul 08826 South Korea Seoul Natl Univ Coll Engn Dept Naval Architecture & Ocean Engn 01 Gwanak Ro Seoul 08826 South Korea Nha Trang Univ Dept Engn Mech 02 Nguyen Dinh Chieu St Nha Trang City Vietnam

This is Part II in a series of papers. Part I [1] investigated the slamming responses of flexible flat stiffened steel and aluminum plates using the nonlinear explicit finite element code LS-Dyna with the Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) solver. Subsequently, a simplified finite element FSI model of water hitting structures that is realistically close to the slamming phenomenon occurring on the bottom part of offshore structures was proposed. The proposed FSI methodology presented in Part I was verified by comparison with the relevant test data. It was evident that the use of the proposed numerical method presented in Part I was very effective for a benchmarking investigation of slamming load considering the hydroelastic effect. However, the method required much effort in terms of computation time and power analysis resources. The present study, Part II, aimed, as an alternative to the FSI analysis approach, to develop empirical formulae for prediction of slamming loads acting on deformable flat stiffened plates used in marine applications. This paper begins by describing the limitations of the existing approaches based on theoretical, experimental and even numerical studies conducted in the past for estimation of slamming loads. Next, it presents, based on the simulation methodology developed in Part I, rigorous parametric studies that had been performed on actual scantlings of marine-seagoing structures. The effects of structural geometry and water impact velocity on slamming pressure are then investigated in detail. Subsequently, the parametric results are analyzed and utilized to derive empirical formulations for the prediction of slamming loads acting on flat stiffened plates of marine structures. The accuracy and reliability of the proposed formulations are established by comparison with the results of the test and other existing formulations. The proposed formulations are expected to be used for the purposes of the design without any time-

关键词： Slamming pressure fluid-structure interaction Flat stiffened plate Empirical formulation

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：