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Effect of fluid-structure interaction on Vibration of Moving Sandwich Plate With Balsa Wood Core and Nanocomposite Face Sheets

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INTERNATIONAL JOURNAL OF APPLIED MECHANICS 2020年第7期12卷

作者： Haghparast, Elham Ghorbanpour-Arani, Amirabbas Arani, Ali Ghorbanpour Univ Kashan Fac Mech Engn Kashan Iran Univ Kashan Inst Nanosci & Nanotechnol Fac Mech Engn Kashan Iran

This research presents theoretical investigation to analyze vibration of axially moving sandwich plate floating on fluid. This plate is composed of balsa wood core and two nanocomposite face sheets where the three layers vibrated as an integrated sandwich. The fluid-structure interaction (FSI) effects on the stability of moving plate are considered for both ideal and viscous fluid. Halpin-Tsai model is utilized to determine the material properties of two-phase composite consist of uniformly distributed and randomly oriented carbon nanotubes (CNTs) through the PmPV (poly{(m-phenylenevinylene)co-[(2,5-dioctoxy-p-phenylene)vinylene]}) matrix. The governing equations are derived based on sinusoidal shear deformation plate theory (SSDT) which is more accurate than the conventional theories, and significantly, it does not require a shear correction factor. Employing Hamilton's principle, the equations of motion are obtained and solved by the semi-analytical method. Results indicated that the dimensionless frequencies of moving sandwich plate decrease rapidly with increasing the water level and they are almost independent of fluid level when it is higher than 50% of the plate length. The results of this investigation can be used in design and manufacturing of marine vessels and aircrafts.

关键词： fluid-structure interaction axially moving plate Halpin-Tsai theory sandwich plate balsa wood core

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Adaptive mesh refinement for simulating fluid-structure interaction using a sharp interface immersed boundary method

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2020年第12期92卷 1890-1913页

作者： Wang, Zhuo Du, Lin Sun, Xiaofeng Beihang Univ Sch Energy & Power Engn 37 Xueyuan Rd Beijing Peoples R China

In this article, adaptive mesh refinement (AMR) is performed to simulate flow around both stationary and moving boundaries. The finite-difference approach is applied along with a sharp interface immersed boundary (IB) method. The Lagrangian polynomial is employed to facilitate the interpolation from a coarse to a fine grid level, while a weighted-average formula is used to transfer variables inversely. To save memory, the finest grid is only generated in the local areas close to the wall boundary, and the mesh is dynamically reconstructed based on the location of the wall boundary. The Navier-Stokes equations are numerically solved through the second-order central difference scheme in space and the third-order Runge-Kutta time integration. Flow around a circular cylinder rotating in a square domain is firstly simulated to examine the accuracy and convergence rate. Then three cases are investigated to test the validity of the present method: flow past a stationary circular cylinder at low Reynolds numbers, flow past a forced oscillating circular cylinder in the transverse direction at various frequencies, and a free circular cylinder subjected to vortex-induced vibration in two degrees of freedom. Computational results agree well with these in the literature and the flow fields are smooth around the interface of different refinement levels. The effect of refinement level has also been evaluated. In addition, a study for the computational efficiency shows that the AMR approach is helpful to reduce the total node number and speed up the time integration, which could prompt the application of the IB method when a great near-wall spatial resolution is required.

关键词： adaptive mesh refinement immersed boundary method fluid-structure interaction

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fluid-structure interaction assessment of blood flow hemodynamics and leaflet stress during mitral regurgitation

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2019年第3期22卷 288-303页

作者： Esfahani, Saeed Adham Hassani, Kamran Espino, Daniel M. Islamic Azad Univ Majlesi Branch Mech Engn Dept Esfahan Iran Islamic Azad Univ Sci & Res Branch Dept Biomech Tehran Iran Univ Birmingham Dept Mech Engn Birmingham W Midlands England

The aim of this study is to simulate the Mitral Regurgitation (MR) disease progression from mild to severe intensity. A fluid structure interaction (FSI) model was developed to extract the hemodynamic parameters of blood flow in mitral regurgitation (MR) during systole. A two-dimensional (2D) geometry of the mitral valve was built based on the data resulting from Magnetic Resonance Imaging (MRI) dimensional measurements. The leaflets were assumed to be elastic. Using COMSOL software, the hemodynamic parameters of blood flow including velocity, pressure, and Von Mises stress contours were obtained by moving arbitrary Lagrange-Euler mesh. The results were obtained for normal and MR cases. They showed the effects of the abnormal distance between the leaflets on the amount of returned flow. Furthermore, the deformation of the leaflets was measured during systole. The results were found to be consistent with the relevant literature.

关键词： fluid-structure interaction hemodynamics mitral regurgitation systole

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fluid-structure interaction of downwind sails: a new computational method

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JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 2019年第1期24卷 86-97页

作者： Cirello, A. Cucinotta, F. Ingrassia, T. Nigrelli, V. Sfravara, F. Univ Palermo Dipartimento Innovaz Ind & Digitale Viale Sci I-90128 Palermo Italy Univ Messina I-98166 Messina Italy

The spreading of high computational resources at very low costs led, over the years, to develop new numerical approaches to simulate the fluid surrounding a sail and to investigate the fluid-structure interaction. Most methods have concentrated on upwind sails, due to the difficulty of implementing downwind sailing configurations that present, usually, the problem of massive flow separation and large displacements of the sail under wind load. For these reasons, the problem of simulating the fluid-structure interaction (FSI) on downwind sails is still subject of intensive investigation. In this paper, a new weak coupled procedure between a RANS solver and a FEM one has been implemented to study the FSI problem in downwind sailing configurations. The proposed approach is based on the progressive increasing of the wind velocity until reaching the design speed. In this way, the structural load is also applied progressively, therefore, overcoming typical convergence difficulties due to the non-linearity of the problem. Simulations have been performed on an all-purpose fractional gennaker. The new proposed method has been also compared with a classic weak FSI approach. Comparable results have been obtained in terms of flying shape of the gennaker and fluid-dynamic loads. The most significant characteristic of the proposed procedure is the easiness to find a solution in a very robust way without convergence problem, and also the capability to reduce the simulation time with regard to the computational cost.

关键词： fluid-structure interaction Finite element method Computational fluid dynamics Gennaker Mainsail Interactive sail design

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Experimental and theoretical study on fluid-structure interaction and non-equilibrium of the flow through micro cracks

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ANNALS OF NUCLEAR ENERGY 2020年 142卷 107441-107441页

作者： Zhang, Jing Li, Chenxi Deng, Jian Sun, Hao Wu, Yingwei Wang, Mingjun Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui Xi An Jiao Tong Univ Dept Nucl Sci & Technol Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Shaanxi Key Lab Adv Nucl Energy & Technol Xian 710049 Peoples R China Nucl Power Inst China Sci & Technol Reactor Syst Design Technol Lab Chengdu Peoples R China

To figure out the flow characteristics through cracks with narrow and short passage, experimental and theoretical studies were conducted in this study. The leakage flow phenomena such as crack opening enlargement, partial flashing and actual flow region were discovered during the test. The mechanism models were proposed according to the test results. Mechanical model on the COD (crack opening displacement) variation was presented considering the fluid-structure interaction;the entrance resistant coefficient model for cracks was raised, which elaborates the dependence of entrance resistance on stagnation condition and crack opening;non-equilibrium model based on flashing fraction and flashing inception was put forward, taking partial flashing and choking into account;for circumferential crack, flow region was suggested, which increases with stagnation temperature. The above models have been validated and evaluated by the experimental results of this study and from literature. It was proved that, by considering the detailed flow phenomenon and characteristics for cracks with extreme narrow and short passage, these mechanism models significantly improve the prediction accuracy. This study provides a large enhancement on the understanding and prediction of choked flow though micro cracks. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Flow mechanism Crack fluid-structure interaction Non-equilibrium model Entrance resistance

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Homogenization of the fluid-structure interaction in acoustics of porous media perfused by viscous fluid

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ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK 2020年第4期71卷 137-137页

作者： Rohan, Eduard Naili, Salah Univ West Bohemia Fac Appl Sci NTIS New Technol Informat Soc Tech 8 Plzen 30100 Czech Republic Univ Paris Est Creteil CNRS MSME F-94010 Creteil France Univ Gustave Eiffel MSME F-77447 Marne La Vallee France

This paper aims to clarify the homogenization results of the fluid-structure interaction in porous structures under the quasi-static and dynamic loading regimes. In the latter case, the acoustic fluctuations yield naturally a linear model which can be introduced in the configuration deformed as the consequence of the steady permanent flow. We consider a Newtonian slightly compressible fluid under the barotropic acoustic approximation. In contrast with usual simplifications, the advection phenomenon of the Navier-Stokes equations is accounted for. The homogenization results are based on the periodic unfolding method combined with the asymptotic expansion technique which provide a straight procedure leading the local problems for corrector functions yielding the effective model parameters and the macroscopic model. We show that the local problems for the solid and fluid parts are decoupled even in the dynamic interactions including the wall shear stress on the periodic interfaces. The dynamic permeability depends on the fluid flow properties including the advection effects associated with an assumed stationary perfusion of the porous structure.

关键词： Homogenization Porous media Acoustic waves Navier-Stokes equations fluid-structure interaction Dynamic permeability Advection

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A non-penetration FEM-MPM contact algorithm for complex fluid-structure interaction problems

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COMPUTERS & fluidS 2020年 213卷 104749-104749页

作者： Song, Yan Liu, Yan Zhang, Xiong Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China

The improved coupled finite element material point (ICFEMP) method is an effective way to deal with fluid-structure interaction problems. However, the FEM-MPM contact algorithm employed in ICFEMP suffers from the contact penetration problem which limits its application in engineering. In this paper, the reason leading to the penetration phenomenon is revealed. The singularity of the normal vector of two adjacent surfaces makes the contact position not well-defined around at the joint line, so that particles near the joint line may penetrate the contact surface. An improved local search method is proposed in this paper to eliminate the penetration. In addition, an iterative process for imposing contact forces is proposed as well to overcome the difficulty that contact conditions can hardly be satisfied simultaneously for all contact pairs caused by the interaction among them. Numerical results illustrate that the proposed contact algorithm thoroughly eliminates the penetration phenomenon even in complex engineering problem such as the airbag simulation. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Material point method fluid-structure interaction Particle-suface contact

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A fluid-structure interaction analysis of anisotropic Dacron fabric used for aortic replacement

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JOURNAL OF fluidS AND structureS 2020年 97卷 103108-103108页

作者： Jayendiran, Raja Nour, Bakr Ruimi, Annie Texas A&M Univ Qatar Mech Engn Program Doha Qatar Weill Cornell Med Qatar Doha Qatar

We present the results of a computational study aimed at capturing the behavior over time of Dacron fabric used for surgical correction of aortic aneurysms. The study concerns the problem of compliance mismatch between the graft and the native aorta and is very important to clinicians. The aorta is represented by a sophisticated anisotropic hyperelastic model (GOH), which takes into account the orientation of the collagen fibers. The corrugations present on the Dacron fabric are modeled geometrically using experimental data retrieved from the literature. The viscoelastic behavior of the Dacron graft reported by clinicians is also taken into account. Mechanical quantities experienced by the graft sewn to an aortic segment are obtained using fluid-structure interaction (FSI) simulations assuming realistic blood flow conditions. Both ascending and descending aorta with two curvatures are considered. Results of this study indicate that (i) the strains on the Dacron-aorta structure increase with increasing curvature and over time (ii) the simulations are capable of capturing stress concentrations at the junction of the graft and the aorta and (iii) the wall shear stresses (WSS) are substantially higher on the aortic segment than on the Dacron graft. (c) 2020 Elsevier Ltd. All rights reserved.

关键词： Human aorta Dacron graft fluid-structure interaction Anisotropic hyperelastic Viscoelastic

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Free vibration analysis of FGM cylindrical shells surrounded by Pasternak elastic foundation in thermal environment considering fluid-structure interaction

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APPLIED MATHEMATICAL MODELLING 2020年 78卷 550-575页

作者： Baghlani, Abdolhossein Khayat, Majid Dehghan, Seyed Mehdi Shiraz Univ Technol Dept Civil Engn & Environm Shiraz Iran

This paper presents an investigation on partially fluid-filled cylindrical shells made of functionally graded materials (FGM) surrounded by elastic foundations (Pasternak elastic foundation) in thermal environment. Material properties are assumed to be temperature dependent and radially variable in terms of volume fraction of ceramic and metal according to a simple power law distribution. The shells are reinforced by stiffeners attached to their inside and outside in which the material properties of shell and the stiffeners are assumed to be continuously graded in the thickness direction. The formulations are derived based on smeared stiffeners technique and classical shell theory using higher-order shear deformation theory which accounts for shear flexibility through shell's thickness. Displacements and rotations of the shell middle surface are approximated by combining polynomial functions in the meridian direction and truncated Fourier series with an appropriate number of harmonic terms in the circumferential direction. The governing equations of liquid motion are derived using a finite strip element formulation of incompressible inviscid potential flow. The dynamic pressure of the fluid is expanded as a power series in the radial direction. Moreover, the quiescent liquid free surface is modeled by concentric annular rings. A detailed numerical study is carried out to investigate the effects of power-law index of functional graded material, fluid depth, stiffeners, boundary conditions, temperature and geometry of the shell on the natural frequency of eccentrically stiffened functionally graded shell surrounded by Pasternak foundations. (C) 2019 Elsevier Inc. All rights reserved.

关键词： Functionally graded materials Free vibration Semi-analytical method Pasternak elastic foundation fluid-structure interaction Stiffeners

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A time-dependent FEM-BEM coupling method for fluid-structure interaction in 3d

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APPLIED NUMERICAL MATHEMATICS 2020年 152卷 49-65页

作者： Gimperlein, Heiko Oezdemir, Ceyhun Stephan, Ernst P. Heriot Watt Univ Maxwell Inst Math Sci Edinburgh EH14 4AS Midlothian Scotland Heriot Watt Univ Dept Math Edinburgh EH14 4AS Midlothian Scotland Univ Paderborn Inst Math Warburger Str 100 D-33098 Paderborn Germany Leibniz Univ Hannover Inst Appl Math D-30167 Hannover Germany Graz Univ Technol Inst Mech A-8010 Graz Austria

We consider the well-posedness and a priori error estimates of a 3d FEM-BEM coupling method for fluid-structure interaction in the time domain. For an elastic body immersed in a fluid, the exterior linear wave equation for the fluid is reduced to an integral equation on the boundary involving the Poincare-Steklov operator. The resulting problem is solved using a Galerkin boundary element method in the time domain, coupled to a finite element method for the Lame equation inside the elastic body. Based on ideas from the time independent coupling formulation, we obtain an a priori error estimate and discuss the implementation of the proposed method. Numerical experiments illustrate the performance of our scheme for model problems. (C) 2020 IMACS. Published by Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction FEM-BEM coupling Space-time methods A priori error estimate Wave equation

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