检索结果-内蒙古大学图书馆

fluid-structure interaction in Z-shaped pipe with different supports

Acta Mechanica Sinica 2020年第2期36卷 513-523页

作者： Q.Guo J.X.Zhou X.L.Guan College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Highway Science and Technology Research Institute Xinjiang Production and Construction Corpsürümqi 830002China

fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery *** is liable to cause local ***,FSI analysis is necessary in many cases,especially for flexible pipe *** modeling consists of eight governing equations and then completely solved via the finite volume method(FVM).Friction,Poisson and joint couplings were discussed in detail to reveal the influence of a Z-shaped pipe with different supports and elbows on *** the feasibility of solving FSI by FVM was verified,the different effects of free,fixed and elastic supports on FSI in the commonly used and simplified Z-shaped pipe were further *** indicated that different support stiffness lead to various FSI *** coupling occurs at the elbow and less support is considered,then the pipe has a relatively large amplitude and complex pressure fluctuation.

关键词： fluid-structure interaction Finite volume method Z-shaped pipe Support stiffness

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction with ALE formulation and skeleton-based structural models

引用

JOURNAL OF fluidS AND structureS 2022年 110卷

作者： Kalliontzis, Dimitrios Univ Houston Dept Civil & Environm Engn N113 Engn Bldg 14226 Martin Luther King Blvd Houston TX 77204 USA

This paper presents a fluid-structure interaction (FSI) framework that combines an Arbitrary Lagrangian-Eulerian (ALE) formulation with skeleton-based structural models consisting of force-based frame elements. For the first time in literature, a methodology is proposed to enable coupling between fluid and force-based frame elements through an ALE formulation. In the proposed methodology, communication between the fluid and skeleton-based domains is performed through a geometric model of the physical fluid- structure interface. With the use of force-based frame elements, the intent is to perform accurate FSI calculations in cases where axial, flexure, and shear motions dominate the structural responses. The proposed framework is evaluated against FSI problems involving steady and unsteady incompressible laminar flows and different structural models representing horizontal (beam) and vertical (column) solid members. (C)& nbsp;2022 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction ALE formulation Stabilized Navier-Stokes equations Force-based frame element Non-matching mesh Skeleton-based model

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction simulations of patient-specific aortic dissection

引用

BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2020年第5期19卷 1607-1628页

作者： Baeumler, Kathrin Vedula, Vijay Sailer, Anna M. Seo, Jongmin Chiu, Peter Mistelbauer, Gabriel Chan, Frandics P. Fischbein, Michael P. Marsden, Alison L. Fleischmann, Dominik Stanford Univ Dept Radiol 3D & Quantitat Imaging Lab Stanford CA 94305 USA Stanford Univ Dept Pediat Cardiol Stanford CA 94305 USA Stanford Univ Dept Cardiothorac Surg Stanford CA 94305 USA Univ Magdeburg Dept Simulat & Graph Magdeburg Germany Stanford Univ Dept Bioengn Stanford CA 94305 USA

Credible computational fluid dynamic (CFD) simulations of aortic dissection are challenging, because the defining parallel flow channels-the true and the false lumen-are separated from each other by a more or less mobile dissection membrane, which is made up of a delaminated portion of the elastic aortic wall. We present a comprehensive numerical framework for CFD simulations of aortic dissection, which captures the complex interplay between physiologic deformation, flow, pressures, and time-averaged wall shear stress (TAWSS) in a patient-specific model. Our numerical model includes (1) two-way fluid-structure interaction (FSI) to describe the dynamic deformation of the vessel wall and dissection flap;(2) prestress and (3) external tissue support of the structural domain to avoid unphysiologic dilation of the aortic wall and stretching of the dissection flap;(4) tethering of the aorta by intercostal and lumbar arteries to restrict translatory motion of the aorta;and a (5) independently defined elastic modulus for the dissection flap and the outer vessel wall to account for their different material properties. The patient-specific aortic geometry is derived from computed tomography angiography (CTA). Three-dimensional phase contrast magnetic resonance imaging (4D flow MRI) and the patient's blood pressure are used to inform physiologically realistic, patient-specific boundary conditions. Our simulations closely capture the cyclical deformation of the dissection membrane, with flow simulations in good agreement with 4D flow MRI. We demonstrate that decreasing flap stiffness from Eflap=800 kPa (a) increases the displacement of the dissection flap from 1.4 to 13.4 mm, (b) decreases the surface area of TAWSS by a factor of 2.3, (c) decreases the mean pressure difference between true lumen and false lumen by a factor of 0.63, and (d) decreases the true lumen flow rate by up to 20% in the abdominal aorta. We conclude that the mobility of the dissection flap substantially i

关键词： Aortic dissection Computational hemodynamics fluid-structure interaction Prestress Tissue support 4D flow MRI

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction modeling of blood flow in the pulmonary arteries using the unified continuum and variational multiscale formulation

引用

MECHANICS RESEARCH COMMUNICATIONS 2020年 107卷 103556页

作者： Liu, Ju Yang, Weiguang Lan, Ingrid S. Marsden, Alison L. Stanford Univ Dept Bioengn Dept Pediat Cardiol Clark Ctr E1-3318 Campus Dr Stanford CA 94305 USA Stanford Univ Inst Computat & Math Engn Clark Ctr E1-3318 Campus Dr Stanford CA 94305 USA

In this work, we present a computational fluid-structure interaction (FSI) study for a healthy patient-specific pulmonary arterial tree using the unified continuum and variational multiscale (VMS) formulation we previously developed. The unified framework is particularly well-suited for FSI, as the fluid and solid sub-problems are addressed in essentially the same manner and can thus be uniformly integrated in time with the generalized-amethod. In addition, the VMS formulation provides a mechanism for large-eddy simulation in the fluid sub-problem and pressure stabilization in the solid sub-problem. The FSI problem is solved in a quasi-direct approach, in which the pressure and velocity in the unified continuum body are first solved, and the solid displacement is then obtained via a segregated algorithm and prescribed as a boundary condition for the mesh motion. Results of the pulmonary arterial FSI simulation are presented and compared against those of a rigid wall simulation. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Unified continuum model Variational multiscale formulation fluid-structure interaction Cardiovascular biomechanics Pulmonary artery

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction effects on the dynamics of a moving deformable hydrofoil in a fluid flow 14th

Fluid-structure interaction effects on the dynamics of a mov...

引用

14th European Wave and Tidal Energy Conference, EWTEC 2021

作者： Brousseau, P. Benaouicha, M. Guillou, S. Cherbourg University Laboratory of Applied Sciences LUSAC-University of Caen Normandy 60 rue Max-Pol Fouchet Cherbourg-Octeville 50130 France SEGULA TECHNOLOGIES Research and Innovation Unit in Naval and Energy engineering France and with the Cherbourg University Laboratory of Applied Sciences LUSAC-University of Caen Normandy 19 Rue d’Arras 92000 Nanterre 60 rue Max-Pol Fouchet Cherbourg-Octeville 50130 France

The paper focuses on the study of a semiactivated system, based on a combination of a two movements of forced pitching and free heaving motion. Therefore, quantifying with accuracy the hydrodynamic forces applied on the hydrofoil seems to be crucial. This is investigated throughout a numerical modeling of a 2D flexible hydrofoil dynamics, immersed in a fluid flow with a Reynolds number of 2000. In this study, the hydrofoil is animated by a combined forced pitching and heaving movements. Various materials of the structure are studied, from the rigid material to a more flexible one. The fluid-structure interaction (FSI) effects are considered using a partitioned implicit coupling scheme. The Arbitrary Lagrangian-Eulerian (ALE) formulation of the Navier-Stokes equations is applied. Both the viscous incompressible Navier-Stokes equations and the elasticity equation are solved using finite volume method. The study is based on the analysis of the hydrodynamic loads acting on the structure. Therefore, the induced dynamics and the power coefficient of the structure are investigated. It is shown that the flexibility of the hydrofoil has an effect on its hydrodynamic behaviour and that in some configurations, the structure deformations can improve the device energy efficiency. © European Wave and Tidal Energy Conference 2021.

关键词： Deformable structure fluid-structure interaction Numerical simulation Oscillating hydrofoil

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction analysis of a collapsible axial flow blood pump impeller and protective cage for Fontan patients

引用

ARTIFICIAL ORGANS 2020年第8期44卷 E337-E347页

作者： Hirschhorn, Matthew Bisirri, Evan Stevens, Randy Throckmorton, Amy L. Drexel Univ Sch Biomed Engn Sci & Hlth Syst BioCirc Res Lab 3141 Chestnut StRm 718 Philadelphia PA 19104 USA Acad Hlth Syst St Christophers Hosp Children Philadelphia PA USA

Limited donor organs and alternative therapies have led to a growing interest in the use of blood pumps as a treatment strategy for patients with single functional ventricle. The present study examines the use of collapsible and flexible impeller, cage, and diffuser designs of an axial blood pump for Fontan patients. Using one-way fluid-structure interaction (FSI) studies, the impact of blade deformation on blood damage and pump performance was investigated for flexible impellers. We evaluated biocompatible materials, including Nitinol, Bionate 80A polyurethane, and silicone for flow rates between 2.0-4.0 L/min and rotational speeds of 3000-9000 rpm. The level of deformation experienced by a cage and diffuser made of surgical stainless steel (control), Nitinol, and Bionate 80A polyurethane was also predicted using one-way FSI. The fluid pressure on the surface of the impeller, cage, and diffuser was determined using computational fluid dynamics (CFD), and then, the surface pressure was exported and used to investigate the impeller, cage, and diffuser deformation using finite element analysis. Finally, deformed impeller geometries were imported into the CFD software to determine the implication of deformation on pressure generation, blood damage index, and fluid streamlines. It was found that rotational speed, and not flow rate, is the largest determinant of impeller deformation, occurring at the blade trailing edges. The models predicted the maximum impeller deformation for Nitinol to be 40 nm, Bionate 80A polyurethane to be 106 mu m, and silicone to be 2.8 mm, all occurring at 9000 rpm. The effects of silicone deformation on performance were significant, particularly at speeds above 5000 rpm where a decrease in pressure generation of more than 10% was observed. Despite this loss, the pressure generation at 5000 rpm exceeded the level required to alleviate Fontan complications. A blood damage estimation was performed and levels remained low. The effect of significan

关键词： cardiovascular mechanics cavopulmonary assist device computational fluid dynamics finite element analysis fluid-structure interaction Fontan physiology numerical simulations

来源：评论

学校读者我要写书评

暂无评论

Multi-resolution technique integrated with smoothed particle element method (SPEM) for modeling fluid-structure interaction problems with free surfaces

引用

Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 41-62页

作者： Ting Long Zhilang Zhang Moubin Liu Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT) College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Institute of Ocean Research Peking UniversityBeijing 100871China School of Mechanical Engineering Guangxi UniversityNanning 530004China

Free-surface flows, especially those associated with fluid-structure interactions(FSIs), pose challenging problems in numerical simulations. The authors of this work recently developed a smoothed particle element method(SPEM) to simulate FSIs. In this method, both the fluid and solid regions are initially modeled using a smoothed finite element method(S-FEM) in a Lagrangian frame, whereas the fluid regions undergoing large deformations are adaptively converted into particles and modeled with an improved smoothed particle hydrodynamics(SPH) method. This approach greatly improves computational accuracy and efficiency because of the advantages of the S-FEM in efficiently treating solid/fluid regions showing small deformations and the SPH method in effectively modeling moving interfaces. In this work, we further enhance the efficiency of the SPEM while effectively capturing local fluid information by introducing a multi-resolution technique to the SPEM and developing an effective approach to treat multi-resolution element-particle interfaces. Various numerical examples demonstrate that the multiresolution SPEM can significantly reduce the computational cost relative to the original version with a constant ***, the novel approach is effective in modeling various incompressible flow problems involving FSIs.

关键词： smoothed particle element method(SPEM) smoothed finite element method(S-FEM) smoothed particle hydrodynamics(SPH) multi-resolution technique fluid-structure interaction

来源：评论

学校读者我要写书评

暂无评论

An Approach to Generate Level Set Function from STL File for fluid-structure interaction Computations 6th

An Approach to Generate Level Set Function from STL File for...

引用

6th International Conference on Geotechnics, Civil Engineering and structures (CIGOS)

作者： Son Tung Dang Johansen, Stein Tore Akhatov, Iskander SINTEF Ind SP Andersens Veg 15B N-7031 Trondheim Norway NTNU Dept Energy & Proc Engn N-7041 Trondheim Norway Skolkovo Inst Sci & Technol Moscow 121205 Russia Viettel High Technol Ind Corp Da Nang Vietnam

ISBN: (纸本)9789811671609;9789811671593

In this paper, we will present an approach to compute the signed distance or level set function from the Standard Triangle Language (STL) file format. Then the level set is used to represent the surface of a given object inside the computational domain. The continuity and Navier-Stokes equations are solved numerically to study the fluid flows over the solid body. The finite-volume method (FVM) is applied to approximate all terms in the governing equations to conserve mass and momentum. The cut-cell method is employed to avoid recomputing the mesh points when the body moves around. The transport equation for the level set function is solved accordingly to update the position of the object.

关键词： fluid-structure interaction Computational fluid dynamics Level-set function Cut-cell method

来源：评论

学校读者我要写书评

暂无评论

ENHANCEMENTS OF COMPUTATIONAL fluid DYNAMICS ANALYSIS OF AIR ENTRAPMENT AND fluid-structure interaction DURING PLATE ENTRY TO WATER THROUGH VOF-SLIP AND ADAPTIVE DISCRETIZATION SCHEMES 41

ENHANCEMENTS OF COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF AIR...

引用

ASME 41st International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Mucha, Philipp Jiang, Minyee Bay, Raymond J. Siemens Digital Ind Software Waltham MA 02451 USA Naval Surface Warfare Ctr Carderock Div West Bethesda MD USA

ISBN: (纸本)9780791885925

A Computational fluid Dynamics (CFD) analysis of air entrapment and structural response during flat plate entry to water is presented. Slamming loads remain of concern for the design of safe and efficient ships and offshore structures to ensure structural integrity during extreme. Besides ships with large bow flare or horizontal stern planes, slamming events also occur for fast small craft with stepped hulls. Ditching of airplanes and vehicle wading represent non-marine applications. The advance of computational methods in engineering has enabled fluid-structure interaction (FSI) simulations for slamming. A crucial task of solving the coupled fluid and structural problem is the accurate resolution of free surface dynamics and phase interactions between water and air. Numerical ventilation on the bottom plating can arise due to discretization issues and curtail the resolution of physical aeration effects. The study at hand was based on a Finite-Volume (FV) method and the numerical solution of Reynolds-averaged Navier-Stokes (RANS) equations. Emphasis was laid on numerical techniques to contain numerical ventilation whilst limiting the increase in computational cost. In doing so, adaptive discretization schemes were employed. Namely, model-based adaptive mesh refinement (AMR) and time stepping for both motions of bodies (rigid and elastic) and the free surface. Additionally, the underlying Volume of fluid (VoF) method was enhanced through consideration of slip between water and air to improve air entrapment predictions. Comparison was drawn to a novel experimental analysis for which both structural responses and high-resolution imagery of aeration were available. It was demonstrated that above enhancements not only lead to better capturing of air entrapment and reduced numerical ventilation, but also offered more flexible modeling concepts and potential performance gains.

关键词： fluid-structure interaction CFD multiphase flows

来源：评论

学校读者我要写书评

暂无评论

Parallel fluid-structure interaction Simulation 22nd

Parallel Fluid-Structure Interaction Simulation

引用

22nd Annual International Conference on Computational Science (ICCS)

作者： Chen, Meng-Huo Chung Cheng Univ Chiayi Taiwan

ISBN: (纸本)9783031087608;9783031087592

In this work we implement the parallelization of a method for solving fluid-structure interactions: one-field monolithic fictitious domain (MFD). In this algorithm the velocity field for solid domain is interpolated into fluid velocity field through an appropriate L-2 projection, then the resulting combined equations are solved simultaneously (rather than sequentially). We parallelize the finite element discretization of spatial variables for fluid governing equations and linear system solver to accelerate the computation. Our goal is to reduce the simulation time for high resolution fluid-structure interaction simulation, such as collision of multiple immersed solids in fluid.

关键词： fluid-structure interaction Finite element Parallel processing

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：