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Numerical analysis of wave propagation across Solid-fluid interface with fluid-structure interaction in circular tube

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INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 2020年 183卷 104099-104099页

作者： Kojima, Tomohisa Inaba, Kazuaki Tokyo Inst Technol Grad Sch Sci & Engn Meguro Ku 2-12-1-I6-5 Ookayama Tokyo 1528550 Japan Tokyo Inst Technol Sch Environm & Soc Meguro Ku 2-12-1-I6-5 Ookayama Tokyo 1528550 Japan Chuo Univ Fac Sci & Engn Bunkyo Ku 1-13-27 Kasuga Tokyo 1128551 Japan

fluid-structure interaction (FSI) and wave propagation in engineering structures can cause severe damage to piping systems or fluid machines, inducing serious accidents. In these phenomena, the mechanism of structural damage depends on the wave propagation across the fluid-solid interface. Previous studies reported that disagreements between the induced pressure value on the solid-fluid movable interface and the value predicted by the classical one-dimensional theory arose from the effects of two-dimensional wave propagation. To address this problem, in this study, a two-dimensional axisymmetric simulation of wave propagation across the solid-fluid interface with FSI was conducted. The simulation was performed using ANSYS Autodyn with a Lagrangian solver for solids and Eulerian solver for water. The results showed that radial wave propagation caused by the dynamic effect of the tube and water's inertia affected the peak pressure on the solid-fluid interface. The peak pressure was attenuated near the tube wall because of the inertial effect of the tube and fluid expansion. By calculating the mean pressure and axial stress to compare the simulated peak pressure with that from one-dimensional acoustic theory, it was indicated that the transition region for transmitted pressure was located immediately after the solid-fluid interface. In this region, the transmitted peak pressure may exceed the value predicted by one-dimensional acoustic theory. The transition region was oriented in the axial direction from the interface. In addition, prediction of the transmitted peak pressure with one-dimensional acoustic theory was suggested via normal wave speed in the unconfined fluid from a safety engineering perspective, although the circumferential stress generated in the tube enclosing fluid can be sufficiently accurately predicted using the same theory with the Korteweg speed.

关键词： fluid-structure interaction Wave propagation One-dimensional theory Water hammer Numerical simulation Impact response

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Dynamic and fluid-structure interaction simulations of a ceramic matrix composite plate

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COMPOSITE structureS 2020年 243卷 112177-112177页

作者： Han, Dong Gao, Xiguang Zhang, Huajun Zhang, Sheng Yu, Guoqiang Song, Yingdong Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Jiangsu Prov Key Lab Aerosp Power Syst Nanjing 210016 Peoples R China Minist Ind & Informat Technol Key Lab Aeroengine Thermal Environm & Struct Nanjing 210016 Peoples R China Chinese Peoples Liberat Army Representat Off Factory 420 Chengdu 610503 Peoples R China Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Nanjing 210016 Peoples R China

This study presents numerical simulations of a unidirectional ceramic matrix composite (CMC) plate under different loads considering the effect of fluid-structure interaction (FSI). The two-scale method was used in the dynamic simulation of CMC plate. The shear-lag model considering the damage modes of CMCs was used to simulate the constitutive behavior in the micro-scale. The explicit dynamic finite element method was used to simulate the dynamic response in the macro-scale. The dynamic responses of CMC plate under impulse and harmonic load were simulated. The incompressible Navier-Stokes equations were employed in the simulation of fluid. The dynamic response of CMC plate with FSI was solved based on the staggered method. The effect of fluid on the dynamic response of CMC plate was discussed.

关键词： Ceramic matrix composites Dynamic fluid-structure interaction Shear-lag model

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Biomechanical Assessment of Bicuspid Aortic Valve Phenotypes: A fluid-structure interaction Modelling Approach

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CARDIOVASCULAR ENGINEERING AND TECHNOLOGY 2020年第4期11卷 431-447页

作者： de Oliveira, Diana M. C. Abdullah, Nazirul Green, Naomi C. Espino, Daniel M. Univ Birmingham Dept Mech Engn Birmingham B15 2TT W Midlands England

Purpose Bicuspid aortic valve (BAV) is a congenital heart malformation with phenotypic heterogeneity. There is no prior computational study that assesses the haemodynamic and valve mechanics associated with BAV type 2 against a healthy tricuspid aortic valve (TAV) and other BAV categories. Methods A proof-of-concept study incorporating three-dimensional fluid-structure interaction (FSI) models with idealised geometries (one TAV and six BAVs, namely type 0 with lateral and anterior-posterior orientations, type 1 with R-L, N-R and N-L leaflet fusion and type 2) has been developed. Transient physiological boundary conditions have been applied and simulations were run using an Arbitrary Lagrangian-Eulerian formulation. Results Our results showed the presence of abnormal haemodynamics in the aorta and abnormal valve mechanics: type 0 BAVs yielded the best haemodynamical and mechanical outcomes, but cusp stress distribution varied with valve orifice orientation, which can be linked to different cusp calcification location onset;type 1 BAVs gave rise to similar haemodynamics and valve mechanics, regardless of raphe position, but this position altered the location of abnormal haemodynamic features;finally, type 2 BAV constricted the majority of blood flow, exhibiting the most damaging haemodynamic and mechanical repercussions when compared to other BAV phenotypes. Conclusion The findings of this proof-of-concept work suggest that there are specific differences across haemodynamics and valve mechanics associated with BAV phenotypes, which may be critical to subsequent processes associated with their pathophysiology processes.

关键词： Bicuspid aortic valve Congenital malformation fluid-structure interaction Multi-physics modelling

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A Nitsche stabilized finite element method for embedded interfaces: Application to fluid-structure interaction and rigid-body contact

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JOURNAL OF COMPUTATIONAL PHYSICS 2020年 413卷 109461-109461页

作者： Liu, B. Tan, D. Natl Univ Singapore Dept Mech Engn Singapore 119077 Singapore

In this article, an accurate and robust numerical formulation is presented for the simulation of the fluid-structure interaction in incompressible fluid flow. The incompressible Navier-Stokes equation is discretized with a stabilized finite element framework on the fixed Eulerian grid. Both symmetric and non-symmetric Nitsche's methods are accessed and employed to weakly impose Dirichlet boundary condition along the interface embedded in the element together with the ghost penalty method stabilizing the solution jump across the element edges. An easy-to-implement and robust numerical integration scheme based on a projection approach is proposed. To the author's knowledge, so far, there is no application of a projection-based approach in the field of numerical integration to deal with discontinuities. Therefore, the results presented in this article is considered as a pioneered and novel projection-based approach in the field of numerical integration to deal with embedded discontinuous function. A second-order staggered-partitioned scheme is employed to weakly couple the fluid and structure solvers. A second-order accurate and unconditionally stable time integration scheme is implemented for simulations. Accurate numerical results are obtained in the numerical examples and validation cases, including vortex-induced vibration (VIV), rotation, freely fall and rigid-body contact. (C) 2020 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Nitsche's method Ghost penalty method Projection-based adaptive Gauss quadrature Finite element

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fluid-structure interaction problem of hydrodynamic motion of an independent escape capsule under variable constraint conditions

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OCEAN ENGINEERING 2019年 187卷 106198-000页

作者： Zhang, Lei Kong, Bin Lin, Shiyao Wang, Chizhong Xie, De Sun, Jianglong Huazhong Univ Sci & Technol Sch Naval Architecture & Ocean Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China Wuhan Second Ship Design & Res Inst Wuhan 430064 Hubei Peoples R China Univ Washington Dept Aeronaut & Astronaut Seattle WA 98195 USA Zhejiang Univ Ocean Coll Hangzhou 310058 Zhejiang Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explor Shanghai 200240 Peoples R China Huazhong Univ Sci & Technol Hubei Key Lab Naval Architecture & Ocean Engn Hyd 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China

Hydrodynamic behavior of an independent escape capsule from a disabled submarine is a complex six-degrees-of-freedom motion, in which added-mass effect is strong and variable constraint conditions happen. In this paper, loosely (or weakly) coupled scheme is adopted to solve this fluid-structure interaction problem. Flow field is simulated by Fluent (version 13.0.1) and motion equations are solved by the fourth-order Runge-Kutta method separately. Unstructured dynamic mesh technology is used to trace the trajectory of capsule. Hydrodynamic force is decomposed into resistance and added mass force, and new motion equations are derived in order to handle the huge added mass. The surfaces of capsule and its chamber come into contact randomly. The variable constraint conditions are analyzed and their corresponding kinematical equations are introduced. This loosely coupled scheme is applied to study the hydrodynamic behavior of a two-dimensional capsule from a narrow space into an open domain under different ocean currents. Hydrodynamic force, motion characteristics and trajectory are obtained. The simulation indicates that the velocity and direction of flow strongly affect the motion of capsule, and the contact force leads to the jamming problem of capsule during its ejection process.

关键词： fluid-structure interaction Hydrodynamic motion Added-mass effect Various constraint conditions Independent escape capsule

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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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Experimental investigation of transients-induced fluid-structure interaction in a pipeline with multiple-axial supports

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JOURNAL OF fluidS AND structureS 2020年第0期93卷 102848-000页

作者： Keramat, Alireza Fathi-Moghadam, Manoochehr Zanganeh, Roohollah Rahmanshahi, Mostafa Tijsseling, Arris S. Jabbari, Ebrahim Jundi Shapur Univ Technol Civil Engn Dept Dezful Iran Shahid Chamran Univ Ahvaz Dept Hydraul Struct Ahvaz Iran Iran Univ Sci & Technol Dept Civil Engn Tehran Iran Shahid Chamran Univ Ahvaz Dept Water Sci Engn Ahvaz Iran Eindhoven Univ Technol Dept Math & Comp Sci Eindhoven Netherlands

fluid-structure interaction (FSI) in pipes can significantly affect pressure fluctuations during water hammer event. In transmission pipelines, anchors with axial stops have an important role in the waterhammer-induced FSI as they can suppress or allow the propagation of additional stress waves in the pipe wall. More specifically, a reduction in the number of axial stops and/or their stiffness causes significant oscillations in the observed pressure signal due to the enhancement of Poisson's coupling. To confirm these physical arguments, this research conducts experimental investigations and then processes the collected pressure signals. The laboratory tests were run on an anchored pipeline with multiple axial supports which some of them removed at some sections to emerge Poisson's coupling. The collected pressure signals are analyzed in the time and frequency domain in order to decipher fluctuations that stem from Poisson coupling and other anchors effects. The analysis of the laboratory data reveals that the pattern of the time signals of pressure is primarily affected by the stiffness and location of the supports. Likewise, the properties of structural boundaries characterize the frequency spectrum of the transient pressures, which is manifested by altering the amplitudes corresponding to dominant frequencies of the system. The study is of particular importance in practice of transient based defect detections and pipe system design. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Waterhammer fluid-structure interaction Pipeline supports Frequency spectrum

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Evaluation of aerodynamic instability for building using fluid-structure interaction analysis combined with multi-degree-of-freedom structure model and large-eddy simulation

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JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS 2020年 197卷 104052-000页

作者： Hasama, Takamasa Saka, Toshihide Itoh, Yoshiaki Kondo, Koji Yamamoto, Manabu Tamura, Tetsuro Yokokawa, Mitsuo Kajima Tech Res Inst Tokyo Japan Tokyo Inst Technol Yokohama Kanagawa Japan Kobe Univ Kobe Hyogo Japan

To evaluate the aerodynamic instability for buildings considering their high-order oscillation mode and torsional oscillation mode on which it is difficult to perform the usual wind tunnel experiments, the fluid-structure interaction (FSI) analysis code combined with a multi-degree-of-freedom structure model and large-eddy simulation was developed. The calculation results obtained in this study and the results of wind tunnel tests conducted in a previous study using a building model (average breadth 0.14 m x length 0.28 m x height 1 m;scale: 1/600) with a multi-degree-of-freedom structure were compared. The comparison showed that the FSI analysis results were corresponded well with those of the wind tunnel tests;for each spectrum of response displacement (wind, along-wind, and torsional direction) at the top mass node, the frequency distribution and the peak frequency of the first and second oscillation modes were in good agreement with the calculation results and the wind tunnel test results. As for the amplitude of the top displacement of the building, the results for both the along- and across-wind directions showed good correspondence. For the torsional direction, the calculation results reproduced a torsional flutter oscillation with a slightly low wind level in comparison with that observed in the wind tunnel experiments.

关键词： Aerodynamic instability High-rise building Torsional flutter oscillation fluid-structure interaction Multi-degree-of freedom structure model Large-eddy simulation

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A critical review on the applications of fluid-structure interaction in porous media

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2020年第1期30卷 308-327页

作者： Khanafer, Khalil Vafai, K. Australian Coll Kuwait Kuwait Kuwait Univ Calif Riverside Dept Mech Engn Riverside CA 92521 USA

Purpose This study aims to investigate a critical review on the applications of fluid-structure interaction (FSI) in porous media. Design/methodology/approach Transport phenomena in porous media are of continuing interest by many researchers in the literature because of its significant applications in engineering and biomedical sectors. Such applications include thermal management of high heat flux electronic devices, heat exchangers, thermal insulation in buildings, oil recovery, transport in biological tissues and tissue engineering. FSI is becoming an important tool in the design process to fully understand the interaction between fluids and structures. Findings This study is structured in three sections: the first part summarizes some important studies on the applications of porous medium and FSI in various engineering and biomedical applications. The second part focuses on the applications of FSI in porous media as related to hyperthermia. The third part of this review is allocated to the applications of FSI of convection flow and heat transfer in engineering systems filled with porous medium. Originality/value Future studies on the applications of FSI in porous media are recommended in this review.

关键词： Hyperthermia Porous medium Heat transfer enhancement fluid-structure interaction Numerical

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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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