检索结果-内蒙古大学图书馆

A memory-efficient MultiVector Quasi-Newton method for black-box fluid-structure interaction coupling

COMPUTERS & structureS 2023年 275卷

作者： Zorrilla, R. Rossi, R. Univ Politecn Catalunya UPC Dept Engn Civil & Ambiental DECA Jordi Girona 1 Barcelona 08034 Spain Int Ctr Numer Methods Engn CIMNE Gran Capita s-n Barcelona 08034 Spain

In this work we present a novel Quasi-Newton technique for the black-box partitioned coupling of inter-face coupled problems. The new RandomiZed Multi-Vector Quasi-Newton method stems from the com-bination of the original Multi-Vector Quasi-Newton technique with the randomized Singular Value Decomposition algorithm, avoiding thus any dense DOFs-sized square matrix operation. This results in a reduction from quadratic to linear complexity in terms of the number of DOFs. Besides this, the need of storing the old inverse Jacobian is also avoided. Instead, only two very "thin" matrices are required to be saved, thus implying a much smaller memory footprint. Furthermore, our proposal can be used free of any user-defined parameter. The article describes the application of the method to the FSI interface residual equations in both Interface Quasi-Newton and Interface Block Quasi-Newton forms. For the lat-ter, we also derive a closed form expression for the update, thus avoiding any linear system of equations resolution, by applying the Woodbury matrix identity to the inverse Jacobian decomposition matrices.

关键词： fluid-structure interaction Quasi -Newton methods Black-box coupling Randomized Singular Value Decomposition

来源：评论

学校读者我要写书评

暂无评论

Linear stability analysis of fluid-structure interaction problems with an immersed boundary method

引用

JOURNAL OF fluidS AND structureS 2023年第1期117卷

作者： Tirri, Antonia Nitti, Alessandro Sierra-Ausin, Javier Giannetti, Flavio de Tullio, Marco D. Polytech Univ Bari Dept Mech Math & Management Via Re David 200 I-70125 Bari Italy Univ Salerno Dept Ind Engn Via Giovanni Paolo 2132 I-84084 Fisciano Italy Inst Mecan Fluides Toulouse IMFT 2 Allee Pr Camille Soula F-31400 Toulouse France

In this work, we present a novel approach to perform the linear stability analysis of fluid-structure interaction problems. The underlying idea is the combination of a validated immersed boundary solver for the nonlinear coupled dynamics with Krylovbased techniques to obtain a robust and accurate global stability solver for elastic structures interacting with incompressible viscous flows. The computation of the leading eigenvalues of the linearized system is carried out in a matrix-free framework by adopting a classical Krylov subspace method. The proposed algorithm avoids the complex analytical linearization of the equations while retaining all the relevant aspects of the fully-coupled fluid-structure system. The methodology has been tested for several cases involving two-dimensional incompressible flows around elastically mounted circular cylinders. The obtained results show a good quantitative agreement with those available in the literature. Finally, the method was applied to investigate the linear stability of the laminar flow past two elastically mounted cylinders in tandem configuration at Re = 100, revealing the existence of two complex dominant modes. For low values of the reduced velocity U*, only one mode is found to be unstable and related to the stationary wake mode. The loss of stability of the second mode at U* = 4 marks the beginning of the lock-in region. We also show that for U* = 5 the modes interact, giving rise to the beating phenomenon observable in the nonlinear time evolution of the system. For larger values of the reduced velocity, the linear dynamics is governed by one dominant mode characterized by wider oscillations of the rear cylinder, matching the results of the nonlinear simulations.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： Linear stability analysis Immersed-boundary method fluid-structure interaction Jacobian-free methods

来源：评论

学校读者我要写书评

暂无评论

Vibration Characteristic Analysis of Hollow Fiber Membrane for Air Dehumidification Using fluid-structure interaction

引用

MEMBRANES 2023年第2期13卷 233-233页

作者： Liang, Caihang Chen, Jiaxing Li, Nanfeng Dong, Yanfang Zhong, Tao Zeng, Si Dong, Chuanshuai Guilin Univ Elect Technol Sch Mech & Elect Engn Guangxi Dept Educ Key Lab Microelect Packaging & Assembly Technol Guilin 541004 Peoples R China Dongguan Univ Technol Guangdong Prov Key Lab Distributed Energy Syst Dongguan 523808 Peoples R China Guilin Univ Aerosp Technol Sch Energy & Built Environm Guilin 541004 Peoples R China Nanning Coll Vocat Technol Dept Sci & Technol Nanning 530008 Peoples R China Guangxi Beitou Environm Protect & Water Grp Co Ltd Nanning 530025 Peoples R China South China Univ Technol Sch Chem & Chem Engn Key Lab Enhanced Heat Transfer & Energy Conservat Educ Minist Guangzhou 510641 Peoples R China

Hollow fiber membrane dehumidification is an effective and economical method of air dehumidification. The hollow fiber membrane module is the critical component of the dehumidification system, which is formed by an arrangement of several hollow fiber membranes. The air stream crosses over the fiber bundles when air dehumidification is performed. The fibers vibrate with the airflow. To investigate the characteristics of the fluid-induced vibration of the hollow fiber membrane, the two-way fluid-structure interaction model under the air-induced condition was established and verified by experiments. The effect of length and air velocity on the vibration and modal of a single hollow fiber membrane was studied, as well as the flow characteristics using the numerical simulation method. The results indicated that the hollow fiber membrane was mainly vibrated by fluid impact in the direction of the airflow. When the air velocity was 1.5 m/s similar to 6 m/s and the membrane length was 100 similar to 400 mm, the natural frequency of the membrane was negatively correlated with length and positively correlated with air velocity. Natural frequencies were more sensitive to changes in length than changes in air velocity. The maximum equivalent stress and total deformation increased with air velocity and length. The maximum equivalent stress was concentrated at both ends, and the maximum deformation occurred in the middle. The research results provided a basis for the structural design of hollow fiber membranes under flow-induced vibration conditions.

关键词： hollow fiber membrane fluid-structure interaction modal vibration

来源：评论

学校读者我要写书评

暂无评论

Adaptive time multiscale algorithms for fluid-structure interaction with impacts- Application to a row of PWR fuel assemblies under seismic loading

引用

ANNALS OF NUCLEAR ENERGY 2023年第1期193卷

作者： Faucher, V. Ricciardi, G. CEA Ctr Cadarache Nucl Technol Dept DESIRESNE F-13108 St Paul Les Durance France

The present article is dedicated to numerical methods for the simulation of the response of PWR fuel assemblies under external mechanical loading such as earthquakes. It proposes new algorithms to manage impact sequences within the time multiscale resolution of a strongly coupled fluid-structure partitioned problem. Preserving the computational efficiency imposes an adaptive strategy to adjust the time scale to force the solution of the costly pressure problem for the fluid only when it is necessary to account for the brutal variations in the structure acceleration resulting from significant impacts. The adaptation criteria must be built upon a thorough monitoring and characterization of all impacts, including the duration of the flight sequence before it occurs and the relative velocity between impact entities. Finally, solutions to mitigate the consequences of missed and unresolved impacts in time are provided to avoid spurious amplification of the variation of the acceleration under impact in the fluid velocity field through the time integration scheme. This leads to two classes of adaptive time multiscale algorithms, extensively tested and qualified through two chosen cases of growing complexity. The paper is completed by a full experimental validation of the proposed fluid-structure framework with contact and impacts, using the results available for a row of six fuel scale assembly immersed in water and submitted to a seismic excitation on a shaking table.

关键词： fluid-structure interaction Impacts PWR assemblies Adaptive time multi-scale algorithms

来源：评论

学校读者我要写书评

暂无评论

Shape Gradient Methods for Shape Optimization of an Unsteady Multiscale fluid-structure interaction Model

引用

JOURNAL OF GEOMETRIC ANALYSIS 2024年第8期34卷 245-245页

作者： Zhang, Keyang Zhu, Shengfeng Li, Jiajie Yan, Wenjing East China Normal Univ Sch Math Sci Shanghai 200241 Peoples R China East China Normal Univ Key Lab MEA Minist Educ Shanghai 200241 Peoples R China East China Normal Univ Shanghai Key Lab PMMP Shanghai 200241 Peoples R China Shanghai Jiao Tong Univ Sch Math Sci Shanghai 200240 Peoples R China Xi An Jiao Tong Univ Sch Math & Stat Xian 710049 Shaanxi Peoples R China

We consider numerical shape optimization of a fluid-structure interaction model. The constrained system involves multiscale coupling of a two-dimensional unsteady Navier-Stokes equation and a one-dimensional ordinary differential equation for fluid flows and structure, respectively. We derive shape gradients for both objective functionals of least-squares type and energy dissipation. The state and adjoint state equations are numerically solved on the time-dependent domains using the Arbitrary-Lagrangian-Eulerian method. Numerical results are presented to illustrate effectiveness of algorithms.

关键词： Shape optimization fluid-structure interaction Finite element method Shape gradient

来源：评论

学校读者我要写书评

暂无评论

fluid-structure interaction with H(div)-conforming finite elements

引用

COMPUTERS & structureS 2021年 243卷 106402-106402页

作者： Neunteufel, Michael Schoberl, Joachim Tech Univ Wien Inst Anal & Sci Comp Wiedner Hauptstr 8-10 A-1040 Vienna Austria

In this paper a novel application of the (high-order) H(div)-conforming Hybrid Discontinuous Galerkin finite element method for monolithic fluid-structure interaction (FSI) is presented. The Arbitrary Lagrangian Eulerian (ALE) description is derived for H(div)-conforming finite elements including the Piola transformation, yielding exact divergence free fluid velocity solutions. The arising method is demonstrated by means of the benchmark problems proposed by Turek and Hron (2006). With hp-refinement strategies singularities and boundary layers are overcome leading to optimal spatial convergence rates. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Arbitrary Lagrangian Eulerian Divergence free velocity Hybrid discontinuous Galerkin Hp finite element method

来源：评论

学校读者我要写书评

暂无评论

Porcine and bovine aortic valve comparison for surgical optimization: A fluid-structure interaction modeling study

引用

INTERNATIONAL JOURNAL OF CARDIOLOGY 2021年 334卷 88-95页

作者： Li, Caili Tang, Dalin Yao, Jing Shao, Yongfeng Sun, Haoliang Hammer, Peter Gong, Chanjuan Ma, Luyao Zhang, Yanjuan Wang, Liang Yu, Han Yang, Chun Baird, Christopher Southeast Univ Sch Math Nanjing Peoples R China Southeast Univ Sch Biol Sci & Med Engn Nanjing Peoples R China Worcester Polytech Inst Dept Math Sci Worcester MA 01609 USA Nanjing Med Univ Affiliated Hosp 1 Dept Cardiol Nanjing Peoples R China Nanjing Med Univ Affiliated Hosp 1 Dept Cardiovasc Surg Nanjing Peoples R China Harvard Med Sch Boston Childrens Hosp Dept Cardiac Surg Boston MA 02115 USA Nanjing Med Univ Affiliated Hosp 1 Dept Anesthesiol Nanjing Peoples R China China Informat Tech Designing & Consulting Inst C Beijing Peoples R China Southeast Univ Nanjing Peoples R China

Background: Porcine aortic valve (PAV) and bovine aortic valve (BAV) are commonly used in aortic valve replacement (AVR) surgeries. A detailed comparison for their hemodynamic and structural stress/strain performances would help to better understand valve cardiac function and select valve type and size for AVR outcome optimizations. Methods: Eight fluid-structure interaction models were constructed to compare hemodynamic and stress/strain behaviors of PAV and BAV with 4 sizes (19, 21, 23, and 25 mm). Blood flow velocity, systolic cross-valve pressure gradient (SCVPG), geometric orifice area (GOA), flow shear stresses (FSS), and stress/strain were obtained for comparison. Results: Compared with PAV, BAV has better hemodynamic performance, with lower maximum flow velocity (7.17%) and pressure (9.82%), smaller pressure gradient (mean and peak SCVPG: 8.92% and 9.28%), larger GOA (9.56%) and lower FSS (6.61%). The averages of the mean and peak net pressure gradient values from 4 BAV models were 8.10% and 8.35% lower than that from PAV models. Larger valve sizes for both PAV and BAV had improved hemodynamic performance. Maximum flow velocity, pressure, mean SCVPG and maximum FSS from 25 mm BAV were 36.80%, 15.81%, 39.05% and 38.83% lower than those from 19 mm BAV. The GOA of PAV and BAV 25 mm Valve were 43.75% and 33.07% larger than 19 mm valves, respectively. BAV has lower stress on the leaflets than PAV. Conclusions: BAV had better hemodynamic performance and lower leaflets stress than PAV. More patient studies are needed to validate our findings. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// ***/licenses/by/4.0/).

关键词： Aortic valve replacement fluid-structure interaction Porcine aortic valve Bovine aortic valve

来源：评论

学校读者我要写书评

暂无评论

Time-adaptive partitioned method for fluid-structure interaction problems with thick structures

引用

JOURNAL OF COMPUTATIONAL PHYSICS 2023年 473卷

作者： Bukac, Martina Fu, Guosheng Seboldt, Anyastassia Trenchea, Catalin Univ Notre Dame Dept Appl & Computat Math & Stat Notre Dame IN 46556 USA Univ Pittsburgh Dept Math Pittsburgh PA 15260 USA

In this paper, we present a partitioned numerical scheme for solving fluid-structure interaction (FSI) problems based on the adaptive time-stepping. The viscous, incompressible fluid is described using the Navier-Stokes equations expressed in an Arbitrary Lagrangian Eulerian (ALE) form while the elastic structure is modeled using elastodynamic equations. We implement a partitioned scheme based on the Robin-Robin coupling conditions at the interface, combined with the refactorization of Cauchy's one-legged theta-like method with adaptive time-stepping. The method is unconditionally stable, and for theta = 12, it corresponds to the midpoint rule, which is conservative and second-order convergent in time. The focus of this paper is to study the time-adaptivity properties of the proposed method, and to explore the parameters used in the variable time-stepping. The adaptive process is based on the local truncation error (LTE), for computation of which we consider two methods: Milne's device using a modified Adams-Bashforth two-step method, and Taylor's method. The performance of the method is explored in numerical examples, where the adaptive approach is compared to the one where a fixed time step is used. We present an example based on the method of manufactured solutions, where the effect of different parameters is studied, followed by a classical benchmark problem of a flow around a rigid cylinder attached to a nonlinearly elastic bar inside a two-dimensional channel. Finally, we present a three-dimensional, simplified example of blood flow in a compliant artery.(c) 2022 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Adaptive time-stepping Partitioned scheme Second-order convergence Strongly-coupled

来源：评论

学校读者我要写书评

暂无评论

Modeling of soft fluidic actuators using fluid-structure interaction simulations with underwater applications

引用

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2023年 255卷

作者： Xavier, Matheus S. Harrison, Simon M. Howard, David Yong, Yuen K. Fleming, Andrew J. Univ Melbourne Dept Elect & Elect Engn Parkville Vic 3010 Australia Data61 CSIRO Clayton Vic 3168 Australia Data61 CSIRO Pullenvale Qld 4069 Australia Univ Newcastle Sch Engn Precis Mechatron Lab Callaghan NSW 2308 Australia

Soft robots have been developed for a variety of applications including gripping, locomotion, wearables and medical devices. For the majority of soft robots, actuation is performed using pneumatics or hydraulics. Many previous works have addressed the modeling of these fluid-driven soft robots using static finite element simulations where the pressure inside the actuator is assumed to be constant and uniform. The assumption of constant internal pressure is a useful simplification but introduces significant errors during events such as pressurization, depressurization, and transient loads from a liquid environment. Applications that use soft actuators for locomotion or propulsion operate using a sequence of transient events, so accurate simulation of these events is critical to optimizing performance. To improve the simulation of soft fluidic actuators and enable the modeling of both internal and external fluid flow in underwater applications, this work describes a fully-coupled, three-dimensional fluid-structure interaction simulation approach, where the pressure and flow dynamics are explicitly solved. This approach provides a realistic simulation of soft actuators in fluid environments, and permits the optimization of transient responses, which may be due to a combination of environmental fluid loads and non-uniform pressurization. The proposed methods are demonstrated in a number of case studies and experiments for a range of actuation and both internal and external inlet flow configurations, including bending actuators, a soft robotic fish fin for propulsion, and experimental results of a bending actuator in a high-speed fluid, which correlate closely with simulations. The proposed approach is expected to assist in the design, modeling, and optimization of bioinspired soft robots in underwater applications.

关键词： Soft robotics Soft actuators fluid-structure interaction Finite element modeling Underwater robots

来源：评论

学校读者我要写书评

暂无评论

Effect of aortic bifurcation geometry on pressure and peak wall stress in abdominal aorta: fluid-structure interaction study

引用

MEDICAL ENGINEERING & PHYSICS 2023年第1期118卷 104014-104014页

作者： Jagos, Jiri Schwarz, David Polzer, Stanislav Bursa, Jiri Brno Univ Technol Fac Mech Engn Tech 2896-2 Brno 61669 Czech Republic VSB Tech Univ Ostrava Dept Appl Mech 17 listopadu 2172-15 Ostrava 70800 Czech Republic

Background and Objective: Geometry of aorto-iliac bifurcation may affect pressure and wall stress in aorta and thus potentially serve as a predictor of abdominal aortic aneurysm (AAA), similarly to ***: Effect of aorto-iliac bifurcation geometry was investigated via parametric analysis based on two-way weakly coupled fluid-structure interaction simulations. The arterial wall was modelled as isotropic hyperelastic monolayer, and non-Newtonian behaviour was introduced for the fluid. Realistic boundary conditions of the pulsatile blood flow were used on the basis of experiments in literature and their time shift was tailored to the pulse wave velocity in the model to obtain physiological wave shapes. Eighteen idealized and one patient-specific geometries of human aortic tree with common iliac and renal arteries were considered with different angles between abdominal aorta (AA) and both iliac arteries and different area ratios (AR) of iliac and aortic luminal cross ***: Peak wall stress (PWS) and systolic blood pressure (SBP) were insensitive to the aorto-iliac angles but sensitive to the AR: when AR decreased by 50%, the PWS and SBP increased by up to 18.4% and 18.8%, ***: Lower AR (as a result of the iliac stenosis or aging), rather than the aorto-iliac angles increases the BP in the AA and may be thus a risk factor for the AAA development.

关键词： Aortic bifurcation fluid-structure interaction Abdominal aortic aneurysm Atherosclerosis Aorto-iliac ratio Aorto-iliac angles

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：