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An immersed boundary fluid-structure interaction method for thin, highly compliant shell structures

JOURNAL OF COMPUTATIONAL PHYSICS 2021年 438卷 110369-110369页

作者： Boustani, Jonathan Barad, Michael F. Kiris, Cetin C. Brehm, Christoph Univ Kentucky Dept Mech Engn Lexington KY 40506 USA NASA Computat Aerosci Branch Ames Res Ctr Moffett Field CA 94035 USA Univ Maryland Dept Aerosp Engn College Pk MD 20740 USA

A parallel computational method for simulating fluid-structure interaction problems involving large, geometrically nonlinear deformations of thin shell structures is presented and validated. A compressible Navier-Stokes solver utilizing a higher-order finite difference immersed boundary method is coupled with a geometrically nonlinear computational structural dynamics solver employing the mixed interpolation of tensorial components formulation for thin triangular shell elements. A weak fluid-structure coupling strategy is used to advance the numerical solution in time. The thin shell structures are represented in the fluid domain by a geometry mesh with a finite thickness at or below the size of the local grid spacing in the fluid domain. The methodologies for load and displacement transfer between the disparate geometry and structural meshes are detailed considering a parallel computing environment. The coupled method is validated for canonical simulation based test cases and experimental fluid-structure interaction problems considering large deformations of thin shell structures, including a shock impinging on a cantilever plate, a fixed cylinder with a flexible trailing filament in channel flow, a thin, clamped plate in wall-bounded flow, and a flag waving in viscous crossflow. The FSI method is then demonstrated on a compliant circular sheet with a clamped center exposed to crossflow and finally applied to the inflation of a spacecraft disk-gap-band parachute inflating in supersonic flow conditions resembling the upper Martian atmosphere, where comparison with experimental data is provided. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： fluid-structure interaction Immersed boundary methods Higher-order methods Finite element analysis Shell elements Computational mechanics

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Decomposition of unsteady sheet/cloud cavitation dynamics in fluid-structure interaction via POD and DMD methods

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INTERNATIONAL JOURNAL OF MULTIPHASE FLOW 2021年 142卷 103690-103690页

作者： Liu, Yunqing Wu, Qin Huang, Biao Zhang, Hanzhe Liang, Wendong Wang, Guoyu Beijing Inst Technol Sch Mech Engn Beijing Peoples R China

The objective of this paper is to study sheet/cloud cavitation dynamics in fluid-structure interaction by experimental and numerical methods. The high-speed camera is applied to observe the cavitating flow structures and the Laser Doppler Vibrometer is used to characterize the vibration. A hydrodynamic load cell is applied to measure the lift and drag static force. The results present different cavitating patterns of the flexible hydrofoil and the vibration amplitude is enhanced when the cloud cavitation occurs. The hybrid coupled fluid structure algorithm is adopted to simulate the cloud cavity shedding downstream due to the re-entrant jet from the cavity closure to the hydrofoil's leading edge. The vibration analysis shows that the frequency spectrum of the flexible hydrofoil is much more complicated than the rigid one, the main cavitating flow-induced vibration frequency of the flexible hydrofoil is due to the cavity shedding, others are corresponding to vortex shedding frequency and natural frequency in water. The Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) methods are used to investigate the dominant coherent structures of the cavitating flow. With the POD method, it reveals that large-scale cloud cavities occupy a large amount of energy in the flow field. The DMD method accurately extracts the dominant frequency and modal characteristic, with the first mode corresponding to the mean flow field, the second mode being cavity shedding and the third and fourth mode being vortex shedding. (c) 2021 Elsevier Ltd. All rights reserved.

关键词： Unsteady sheet cloud cavitation Cavitation dynamics fluid-structure interaction POD DMD

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The fluid-structure interaction effect on seismic response of double CAP1400 spent fuel storage racks

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NUCLEAR ENGINEERING AND DESIGN 2021年 384卷 111496-111496页

作者： Liu, Yu Deng, Chao Lu, Daogang Cao, Qiong Zhou, Yixian North China Elect Power Univ Sch Nucl Sci & Engn Beijing Key Lab Pass Safety Technol Nucl Energy Beijing 102206 Peoples R China

The spent fuel storage racks (racks) are immersed in the spent fuel pool to storage the spent fuels temporarily. The safe and reliable operation of racks is crucial to the safety of nuclear power plants. The free-standing rack's design gradually replaces the traditional bottom-fixed design because the free-standing design uses friction and water to decrease the seismic load transfer. The fluid-structure interaction (FSI) effect, which is the key phenomenon for racks under earthquake, can be simplified as an added mass matrix among the racks and the spent fuel pool. The added mass matrix is strongly associated with the rack's distribution and the rack's geometry. CAP1400 (a newly designed reactor type designed by China) racks adopt end-tube-connection construction and abandon outer plates, significantly changing the FSI effect. The end-tube-connection construction's influence on double-rack seismic response hasn't be studied numerically. Moreover, the large uncertainties in the previous experimental response bring some difficulties in model validation. To solve the above two problems, we built two CFD models to study the influence of the rack's outer plates on the added mass matrix. Then double-rack seismic models with /without the FSI effect are validated by the experiments of sine waves and seismic waves input. The validated model is then used to study the influence of the friction coefficient and the outer plates on the rack's seismic response. Results show the previous experimental large uncertainties in racks' displacement response are mainly caused by the extremely low-frequency components. Moreover, the seismic displacement response of racks without outer plates is much larger compared to racks with outer plates, which means racks' seismic performance may be improved if an outer plate is added to CAP1400 racks.

关键词： fluid added mass CAP1400 spent fuel storage rack fluid-structure interaction Seismic analysis

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EXPERIMENTAL VALIDATION OF fluid-structure interaction CO-SIMULATIONS USING ANSYS VIA WIND TUNNEL TESTING OF CANTILEVERED PLATE 18

EXPERIMENTAL VALIDATION OF FLUID-STRUCTURE INTERACTION CO-SI...

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ASME-fluids-Engineering-Division Summer Meeting (FEDSM)

作者： Shepard, Thomas G. Schneider, Kyle Baxter, Sarah Schwartz, William Univ St Thomas St Paul MN 55105 USA Northrup Grumman Plymouth MN USA

ISBN: (纸本)9780791883730

Validation of numerical simulations is a key step in gaining confidence in the fidelity of computational models for a given application. These simulations take on additional complexity in fluid structure interactions when the body being studied experiences flow-induced deformation. In this study, experiments are conducted on a cantilevered aluminum plate mounted in a wind tunnel. Experimentally, deflections are measured using Digital Image Correlation and axial bending strains are measured using strain gages and. These values are compared to a coupled fluid-structure interaction simulation, which co-simulated the structural (Lagrangian FEA) and fluid (Navier-Stokes CFD) computational methods. Within the simulations, FEA parameters including mesh size, mapping method, and mesh type were varied;CFD parameters that were varied include turbulence theory, mesh sizing, inflation layer, mapping method, and Courant Number. Values were varied to study their effects on the simulation solution, as well as to ensure mesh independence of the solution relative to both simulation domains. Experiments were conducted on an Aluminum (6061-T6) plate measuring 152.4 x 50.8 x 0.61 mm. The plate was positioned in the wind tunnel at two different angles relative to the oncoming flow and Reynolds numbers of 98,000 - 247,000 were considered. The numerical simulation demonstrates agreement with DIC displacements and good agreement with measured strains with deflections up to similar to 11 mm. Future steps are discussed.

关键词： fluid-structure interaction cantilever plate deformation strain

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fluid-structure interaction study of spider's hair flow-sensing system 1

Fluid-structure interaction study of spider's hair flow-sens...

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1st International Conference on Materials, Mimicking, Manufacturing from and for Bio Application (BioM&M)

作者： Guarino, Roberto Greco, Gabriele Mazzolai, Barbara Pugno, Nicola M. Univ Trento Lab Bioinspired & Graphene Nanomech Dept Civil Environm & Mech Engn Via Mesiano 77 I-38123 Trento Italy Ist Italiano Tecnol Ctr MicrobioRobot SSSA Viale Rinaldo Piaggio 34 I-56025 Pontedera Italy Italian Space Agcy Ket Lab Edoardo Amaldi Fdn Via Politecn Snc I-00133 Rome Italy Queen Mary Univ London Sch Engn & Mat Sci Mile End Rd London E1 4NS England

In the present work we study the spider's hair flow-sensing system by using fluid-structure interaction (FSI) numerical simulations. We observe experimentally the morphology of Theraphosa stirmi's hairs and characterize their mechanical properties through nanotensile tests. We then use the obtained information as input for the computational model. We study the effect of a varying air velocity and a varying hair spacing on the mechanical stresses and displacements. Our results can be of interest for the design of novel bio-inspired systems and structures for smart sensors and robotics. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： sensing system smart sensor spider hair numerical simulation fluid-structure interaction

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A fluid-structure interaction model for assessing the safety of flood gate vibrations due to wave impacts

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COASTAL ENGINEERING 2021年 170卷 104007-104007页

作者： Tieleman, O. C. Hofland, B. Tsouvalas, A. de Almeida, E. Jonkman, S. N. Delft Univ Technol Fac Civil Engn & Geosci Stevinweg 1 NL-2628 CN Delft Netherlands

This paper establishes a computationally efficient model to predict flood gate vibrations due to wave impacts including fluid-structure interaction. In contrast to earlier models, composite fluid domains are included to represent the situation of a flood gate in a dewatering sluice with the presence of an overhang that causes the confined-wave impacts. The dynamic response of the gate-fluid system is derived in the frequency domain using a substructuring mode matching technique, in which the gate vibrations are first expressed in terms of in-vacuo modes while the liquid motion is described as a superposition of linear potentials. Pressure impulse theory is employed to predict the impulsive wave impact loads, which are superposed on the quasi-steady wave loads. The computational efficiency of the developed model allows for a large number of simulations. This makes it possible for the first time to perform probabilistic evaluations for this type of problems without doing concessions on the accuracy of the physical modelling of the involved fluid-structure interaction processes. This is demonstrated by application of the developed models within a probabilistic framework resulting in the explicit quantification of the failure probability of flood gates subjected to wave impacts.

关键词： Flood gate Vibrations Wave impacts Overhang fluid-structure interaction Mode matching Semi-analytical

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A sharp interface Lagrangian-Eulerian method for rigid-body fluid-structure interaction

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JOURNAL OF COMPUTATIONAL PHYSICS 2021年 443卷 110442-110442页

作者： Kolahdouz, E. M. Bhalla, A. P. S. Scotten, L. N. Craven, B. A. Griffith, B. E. US FDA Div Appl Mech Off Sci & Engn Labs Ctr Devices & Radiol Hlth Silver Spring MD USA Univ N Carolina Dept Math Chapel Hill NC 27515 USA San Diego State Univ Dept Mech Engn San Diego CA 92182 USA Univ N Carolina Dept Math Chapel Hill NC 27515 USA Univ N Carolina Dept Appl Phys Sci Chapel Hill NC 27515 USA Univ N Carolina Dept Biomed Engn Chapel Hill NC 27515 USA Univ N Carolina Carolina Ctr Interdisciplinary Appl Math Chapel Hill NC 27515 USA Univ N Carolina Sch Med Computat Med Program Chapel Hill NC 27515 USA Univ N Carolina Sch Med McAllister Heart Inst Chapel Hill NC 27515 USA

This paper introduces a sharp interface method to simulate fluid-structure interaction (FSI) involving rigid bodies immersed in viscous incompressible fluids. The capabilities of this methodology are benchmarked using a range of test cases and demonstrated using large-scale models of biomedical FSI. The numerical approach developed herein, which we refer to as an immersed Lagrangian-Eulerian (ILE) method, integrates aspects of partitioned and immersed FSI formulations by solving separate momentum equations for the fluid and solid subdomains, as in a partitioned formulation, while also using nonconforming discretizations of the dynamic fluid and structure regions, as in an immersed formulation. A simple Dirichlet-Neumann coupling scheme is used, in which the motion of the immersed solid is driven by fluid traction forces evaluated along the fluid-structure interface, and the motion of the fluid along that interface is constrained to match the solid velocity and thereby satisfy the no-slip condition. To develop a practical numerical method, we adopt a penalty approach that approximately imposes the no-slip condition along the fluid-structure interface. In the coupling strategy, a separate discretization of the fluid-structure interface is tethered to the volumetric solid mesh via stiff springlike penalty forces. Our fluid-structure coupling scheme relies on an immersed interface method (IIM) for discrete geometries, which enables the accurate determination of both velocities and stresses along complex internal interfaces. Numerical methods for FSI can suffer from instabilities related to the added mass effect, but computational tests indicate that the methodology introduced here remains stable for selected test cases across a broad range of solid-fluid mass density ratios, including extremely small, nearly equal, equal, and large density ratios. Biomedical FSI demonstration cases include results obtained using this method to simulate the dynamics of a bileaflet mechan

关键词： fluid-structure interaction Immersed Lagrangian-Eulerian method Immersed interface method Rigid-body dynamics Mass density ratio Biomedical applications

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Numerical investigation of abdominal aortic aneurysm hemodynamics using the reduced unified continuum formulation for vascular fluid-structure interaction

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FORCES IN MECHANICS 2022年 7卷

作者： Lan, Ingrid S. Liu, Ju Yang, Weiguang Marsden, Alison L. Stanford Univ Dept Bioengn Stanford CA 94305 USA Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen 518055 Guangdong Peoples R China Southern Univ Sci & Technol Guangdong Hong Kong Macao Joint Lab Data Driven Fl Shenzhen 518055 Guangdong Peoples R China Stanford Univ Dept Pediat Cardiol Stanford CA 94305 USA Stanford Univ Inst Computat & Math Engn Stanford CA 94305 USA

We recently demonstrated the reduction of the unified continuum and variational multiscale formulation to a computationally efficient fluid-structure interaction (FSI) formulation via three modeling assumptions pertaining to the vascular wall. Similar to the coupled momentum method introduced by Figueroa et al., the resulting semi -discrete formulation yields a monolithically coupled FSI system posed in an Eulerian frame of reference with only a minor modification of the fluid boundary integral. To achieve uniform second-order temporal accuracy and user-controlled high-frequency algorithmic damping, we adopt the generalized-& alpha;method for uniform temporal discretization of the entire coupled system. In conjunction with a fully consistent, segregated predictor multi -corrector algorithm preserving the block structure of the incompressible Navier-Stokes equations in the im-plicit solver's associated linear system, a three-level nested block preconditioner is adopted for improved rep-resentation of the Schur complement. In this work, we apply our reduced unified continuum formulation to an appropriately prestressed patient-specific abdominal aortic aneurysm and investigate the effects of varying spatial distributions of wall properties on hemodynamic and vascular wall quantities of interest.

关键词： fluid-structure interaction Reduced unified continuum model Variational multiscale formulation Nested block preconditioner Abdominal aortic aneurysm

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fluid-structure interaction on concentric composite cylinders containing fluids in the annulus

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MULTISCALE AND MULTIDISCIPLINARY MODELING EXPERIMENTS AND DESIGN 2019年第3期2卷 185-197页

作者： Alaei, D. Kwon, Y. W. Ramezani, A. Naval Postgrad Sch Dept Mech & Aerosp Engn Monterey CA 93943 USA Helmut Schmidt Univ Hamburg Germany

Dynamic response of two concentric horizontal composite cylinders containing water in the annulus was investigated under impact loading so as to examine the load transfer from the outer cylinder to the inner through a fluid medium. Different water filling levels in the annulus were considered along with different magnitudes of impact loading. Both of the composite cylinders were 254 mm long, had a diameter of 76.2 mm and 88.9 mm, respectively, and were assembled concentrically. Both experimental and numerical studies were conducted to supplement each other. The experimental set-up was designed and constructed. Both cylinders were constrained at both ends, and the water level was varied in the annulus of the two cylinders. The experimental set-up used strain gages at certain locations. For each experiment, the strain data were collected and examined. Then, the fast Fourier transform was applied to the strain data to identify major vibrational frequencies and to examine the effect of the added mass. The numerical study provided additional results which were not measured by the experiment, such as the fluid pressure in the annulus and the dynamic motion of the cylinders. The fluid-structure interaction resulted in significant coupling of the outer and inner composite cylinders.

关键词： fluid-structure interaction Structural coupling by fluid Composite structure Impact loading

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Model Updating of fluid-structure interaction Effects on Piping System 37th

Model Updating of Fluid-Structure Interaction Effects on Pip...

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37th IMAC Conference and Exposition on Structural Dynamics

作者： Rajbamshi, Srijan Guo, Qintao Zhan, Ming Nanjing Univ Aeronaut & Astronaut Coll Mech & Elect Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9783030121846;9783030121839

The main goal of this paper is to propose a simplified model to predict the dynamic behavior;mainly vibration under effects of fluid. Firstly, an experiment is carefully designed incorporating important parameters of the system and experimental modal analysis is performed for solid only and with fluid. Then, modal analysis using FEM is performed in real scale 3D model of the test rig and the obtained results is approximated to experimental frequency of the system. Then, a simplified model is developed, which appends the results of explicitly computed mass and stiffness of supports, to a solid only FEM. The new model is analyzed and updated till it is considerably close to the results obtained previously. Based on sensitivity analysis, set of model parameters is selected for the model updating process. Response surface method is implemented to find values of model parameters yielding results closest to the experimental. The results can provide a basis for further experimental and numerical dynamic analysis and optimization.

关键词： fluid-structure interaction Added-mass Pipelines

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