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Improved MPS-FE fluid-structure interaction Coupled Method with MPS Polygon Wall Boundary Model

CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES 2014年第4期101卷 229-247页

作者： Mitsume, N. Yoshimura, S. Murotani, K. Yamada, T. Univ Tokyo Bunkyo Ku Tokyo 113 Japan

The MPS-FE method, which adopts the Finite Element (FE) method for structure computation and the Moving Particle Simulation (MPS) method for fluid computation involving free surfaces, was developed to solve fluid-structure interaction problems with free surfaces. The conventional MPS-FE method, in which MPS wall boundary particles and finite elements are overlapped in order to exchange information at a fluid-structure interface, is not versatile and reduces the advantages of the software modularity. In this study, we developed a non-overlapping approach in which the interface in the fluid computation corresponds to the interface in the structure computation through an MPS polygon wall model. The accuracy of the improved MPS-FE method was verified by solving a dam break problem with an elastic obstacle and comparing the result obtained with that of the conventional MPS-FE method and particle FEM.

关键词： fluid-structure interaction Free Surface Moving Particle Simulation Method Finite Element Method MPS-FE Method

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Scalable large-scale fluid-structure interaction solvers in the Uintah framework via hybrid task-based parallelism algorithms

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2014年第7期26卷 1388-1407页

作者： Meng, Qingyu Berzins, Martin Univ Utah Sci Comp & Imaging Inst Salt Lake City UT 84112 USA

Uintah is a software framework that provides an environment for solving fluid-structure interaction problems on structured adaptive grids for large-scale science and engineering problems involving the solution of partial differential equations. Uintah uses a combination of fluid flow solvers and particle-based methods for solids, together with adaptive meshing and a novel asynchronous task-based approach with fully automated load balancing. When applying Uintah to fluid-structure interaction problems, the combination of adaptive meshing and the movement of structures through space present a formidable challenge in terms of achieving scalability on large-scale parallel computers. The Uintah approach to the growth of the number of core counts per socket together with the prospect of less memory per core is to adopt a model that uses MPI to communicate between nodes and a shared memory model on-node so as to achieve scalability on large-scale systems. For this approach to be successful, it is necessary to design data structures that large numbers of cores can simultaneously access without contention. This scalability challenge is addressed here for Uintah, by the development of new hybrid runtime and scheduling algorithms combined with novel lock-free data structures, making it possible for Uintah to achieve excellent scalability for a challenging fluid-structure problem with mesh refinement on as many as 260K cores. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： MPI threads Uintah many core lock free fluid-structure interaction

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Stress-based topology optimization method for steady-state fluid-structure interaction problems

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2014年 278卷 499-523页

作者： Yoon, Gil Ho Hanyang Univ Sch Mech Engn Seoul 133791 South Korea

This research developed a new stress-based topology optimization method (STOM) for a steady-state fluid-structure interaction (FSI) problem that minimizes the volume subject to the local stress constraints. Despite numerous studies on STOM, challenging optimization issues related to stress-based topology optimization (TO) procedures for fluid-structure multiphysics systems still exist. Critical issues involved in creating a successful TO for an FSI structure include: the interpolation approach between the fluid equation and the structure equation with respect to locally defined design variables, the mutual multiphysics coupling boundary conditions at dramatically evolving interfacing boundaries, and a clear interpretation of the governing equations and the interaction boundary conditions for spatially varying intermediate design variables. In addition to these three issues, which are related to multiphysics equations, there are three important considerations related to the STOM: the stress singularity issue, the issues of multiple constraints and the highly nonlinear behavior of the stress constraints. To resolve all of the aforementioned issues, we applied a monolithic analysis, integrating the qp-relaxation method and the global p-norm approach. Using the present method, we created optimal layouts that minimize the volume constraining local stress values for a steady-state fluid and structural interaction system. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Stress-based topology optimization fluid-structure interaction Monolithic approach

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Study of coating's effects on mechanical performances for sleeve of cotton picker with fluid-structure interaction method

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2014年第17期228卷 3057-3068页

作者： Meng, F. M. Chen, Z. W. Chongqing Univ State Key Lab Mech Transmiss Shazheng St 174 Chongqing 400044 Peoples R China

A sleeve and its matched spindle are key components of a cotton picker, whose performances affect picking cotton efficiency directly. To enhance the sleeve strength and wear resistance, it is desired to add coatings on the inner surface of the sleeve. In this paper, influences of the coatings on the mechanical performances of the sleeve are investigated with fluid-structure interaction method. Mechanical performances of the sleeve are studied at the varied elastic modulus, Poisson's ratio, and thickness of the coating and different operating conditions. The numerical results show that both the amplitude and position of the von Mises stress and strain of the coated sleeve depend on the varied elastic modulus, Poisson's ratio, and thickness of coating. The coating effect on the sleeve is significant at a big eccentricity ratio or high rotational speed of the spindle.

关键词： Coating sleeve cotton picker mechanical performances fluid-structure interaction

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A fixed-grid b-spline finite element technique for fluid-structure interaction

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2014年第9期74卷 623-660页

作者： Rueberg, T. Cirak, F. Univ Cambridge Dept Engn Cambridge CB2 1PZ England

We present a fixed-grid finite element technique for fluid-structure interaction problems involving incompressible viscous flows and thin structures. The flow equations are discretised with isoparametric b-spline basis functions defined on a logically Cartesian grid. In addition, the previously proposed subdivision-stabilisation technique is used to ensure inf-sup stability. The beam equations are discretised with b-splines and the shell equations with subdivision basis functions, both leading to a rotation-free formulation. The interface conditions between the fluid and the structure are enforced with the Nitsche technique. The resulting coupled system of equations is solved with a Dirichlet-Robin partitioning scheme, and the fluid equations are solved with a pressure-correction method. Auxiliary techniques employed for improving numerical robustness include the level-set based implicit representation of the structure interface on the fluid grid, a cut-cell integration algorithm based on marching tetrahedra and the conservative data transfer between the fluid and structure discretisations. A number of verification and validation examples, primarily motivated by animal locomotion in air or water, demonstrate the robustness and efficiency of our approach. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： finite elements fluid-structure interaction Navier-Stokes pressure-correction method b-splines isogeometric analysis

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Biofilm growth: A multi-scale and coupled fluid-structure interaction and mass transport approach

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BIOTECHNOLOGY AND BIOENGINEERING 2014年第7期111卷 1385-1395页

作者： Coroneo, Mirella Yoshihara, Lena Wall, Wolfgang A. Tech Univ Munich Inst Computat Mech D-85747 Garching Germany

In this paper, we propose a novel approach for modelling biofilm growth. It is based on a finite element method and includes both fluid-structure interaction (FSI) as well as scalar transport effects. Due to the different time-scales of the involved phenomena, the growth of the biofilm structure is coupled with the FSI and mass transport through a multi-scale approach in time. In each hydrodynamic time step, first the non-linear FSI problem is solved followed by the scalar transport equations, using the information on velocities and deformations obtained in the FSI step. After a steady state solution is reached, information on mass fluxes and stresses are passed to the growth model. At this point, the growth is calculated for a biological time step larger than the hydrodynamic one and based on the mass flux through the interface and on normal and shear stresses on it. This type of approach can significantly contribute to the understanding of biofilm development in fluid flows, since the influence of hydrodynamic conditions and availability of nutrients is well known to have effects on biofilm development. Therefore, for the purpose of understanding biofilm macro-scale dynamics, it is essential to adopt a modeling approach, which takes into account all the relevant aspects, like fluid flow, structure deformation, mass transport and their effect on biofilm growth and erosion. First numerical examples demonstrate the suitability of the proposed model to catch the main features of a growing biofilm structure. Biotechnol. Bioeng. 2014;111: 1385-1395. (c) 2014 Wiley Periodicals, Inc.

关键词： biofilm growth fluid-structure interaction mass transfer finite element method

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On the necessity of modelling fluid-structure interaction for stented coronary arteries

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JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 2014年 34卷 217-230页

作者： Chiastra, Claudio Migliavacca, Francesco Martinez, Miguel Angel Malve, Mauro Politecn Milan Dept Chem Mat & Chem Engn Giulio Natta Dept Chem Lab Biol Struct Mech LaBS Milan Italy Univ Zaragoza Aragon Inst Engn Res I3A E-50018 Zaragoza Spain Ctr Invest Biomed Red Bioingn Biomat & Nanomed CI E-50018 Zaragoza Spain Univ Publ Navarra Dept Ingn Mecan Energet & Mat E-31006 Pamplona Spain

Although stenting is the most commonly performed procedure for the treatment of coronary atherosclerotic lesions, in-stent restenosis (ISR) remains one of the most serious clinical complications. An important stimulus to ISR is the altered hemodynamics with abnormal shear stresses on endothelial cells generated by the stent presence. Computational fluid dynamics is a valid tool for studying the local hemodynamics of stented vessels, allowing the calculation of the wall shear stress (WSS), which is otherwise not directly possible to be measured in vivo. However, in these numerical simulations the arterial wall and the stent are considered rigid and fixed, an assumption that may influence the WSS and flow patterns. Therefore, the aim of this work is to perform fluid-structure interaction (PSI) analyses of a stented coronary artery in order to understand the effects of the wall compliance on the hemodynamic quantities. Two different materials are considered for the stent: cobalt-chromium (CoCr) and poly-L-lactide (PLLA). The results of the FSI and the corresponding rigid-wall models are compared, focusing in particular on the analysis of the WSS distribution. Results showed similar trends in terms of instantaneous and time-averaged WSS between compliant and rigid-wall cases. In particular, the difference of percentage area exposed to TAWSS lower than 0.4 Pa between the CoCr FSI and the rigid-wall cases was about 1.5% while between the PLLA cases 1.0%. The results indicate that, for idealized models of a stented coronary artery, the rigid-wall assumption for fluid dynamic simulations appears adequate when the aim of the study is the analysis of near-wall quantities like WSS. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Computational fluid dynamics Stent Coronary artery Wall shear stress

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Improved fractional step method for simulating fluid-structure interaction using the PFEM

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2014年第12期99卷 925-944页

作者： Zhu, Minjie Scott, Michael H. Oregon State Univ Sch Civil & Construct Engn Corvallis OR 97331 USA

Numerical difficulties are present in the particle finite element method even though it has been shown to be a powerful and effective approach to simulating fluid-structure interaction. To overcome problems of mass loss on the free surface and the added-mass effect, an improved fractional step method (FSM) that handles added-mass terms in a mathematically exact way is developed. A further benefit is that no assumptions regarding the structural response are made in handling added-mass terms, thus it is straightforward to incorporate material nonlinearity in fluid-structure interaction (FSI) under this approach. Patch tests and comparisons with experimental data are presented in order to verify and validate the improved FSM for FSI applications. The computational cost of this approach is shown to be negligible compared with the other aspects of the FSM, particularly when the size of the structure and the fluid-structure interface is small relative to the volume of fluid. Copyright (C) 2014 John Wiley & Sons, Ltd.

关键词： finite element methods fluid-structure interaction incompressible flow Lagrangian particle methods

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A mortar approach for fluid-structure interaction problems: Immersed strategies for deformable and rigid bodies

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2014年 278卷 853-882页

作者： Hesch, C. Gil, A. J. Carreno, A. Arranz Bonet, J. Betsch, P. Karlsruhe Inst Technol Inst Mech D-76021 Karlsruhe Germany Swansea Univ Coll Engn Zienkiewicz Ctr Computat Engn Singleton Pk SA2 8PP England Swansea Univ Coll Sci Dept Math Singleton Pk SA2 8PP England

This paper proposes a new fluid-structure interaction immersed computational framework. The coupling between an underlying incompressible fluid and an embedded solid is formulated by means of the overlapping domain decomposition method in conjunction with a mortar approach, leading to a variationally consistent scheme which is capable of unifying a range of methodologies currently available in the literature. This novel framework provides great flexibility and enables the modelling of immersed deformable solids (compressible and incompressible) as well as rigid bodies through the use of a weak director based formulation. A novel Null-Space reduction scheme is employed in order to enhance the conditioning of the resulting system of equations and reduce the computational cost. An implicit structure preserving time integration algorithm is used to yield extra stability and robustness and the use of a segmentation technique near the boundary between fluid and solid also leads to enhanced accuracy. The methodology is benchmarked against results obtained by using alternative boundary fitted methodologies. (C) 2014 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Immersed boundary method Mortar method Rigid bodies Overlapping domain decomposition Discrete Null-Space method

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A unifying model for fluid flow and elastic solid deformation: A novel approach for fluid-structure interaction

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JOURNAL OF fluidS AND structureS 2014年 51卷 344-353页

作者： Bordere, S. Caltagirone, J. -P. CNRS ICMCB UPR 9048 F-33600 Pessac France Univ Bordeaux ICMCB UPR 9048 F-33600 Pessac France IPB UMR CNRS 5295 TREFLE I2M F-33607 Pessac France

fluid-structure coupling is addressed through a unified equation for compressible Newtonian fluid flow and elastic solid deformation. This is done by introducing thermodynamics within Cauchy's equation through the isothermal compressibility coefficient that is experimentally measurable for both fluids and solids. The vectorial resolution of the governing equation, where every component of velocity vectors and displacement variation vectors is calculated simultaneously in the overall multi-phase system, is characteristic of a monolithic resolution involving no iterative coupling. For system equation closure, mass density and pressure are both re-actualized from velocity vector divergence, when the shear stress tensor within the solid phase is re-actualized from the displacement variation vectors. This novel approach is first validated on a two-phase system, involving a plane fluid-solid interface, through the two following test cases: (i) steady-state compression and (ii) longitudinal and transverse elastic wave propagations. Then the 3D study of compressive fluid injection towards an elastic solid is analyzed from initial time to steady-state evolution. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Multiphysics Multi-time scale fluid-structure interaction Elastic wave propagation Monolithic approach Unified formulation

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