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The role of fluid-structure interaction in pulsating bubble dynamics near a movable structure

OCEAN ENGINEERING 2021年 238卷 109650-109650页

作者： Hu, Zhen-Yu Li, Shuai Wang, Shi-Ping Zhang, A-Man Harbin Engn Univ Coll Shipbldg Engn 145 Nantong St Harbin Peoples R China

In the present study, the nonlinear bubble-plate interaction is investigated via boundary integral (BI) simulations with a particular focus on the effect of fluid-structure interaction (FSI). A series of experiments of electric discharge cavitation bubbles are also conducted to gain more physical insights. Good agreement between BI simulations and high-speed recordings is obtained. The effects of two geometrical parameters including the normalized stand-off distance gamma and the plate-bubble size ratio theta (both scaled by the maximum bubble radius) are investigated systematically. We find four types of distinct bubble collapse patterns, namely, contacting jet that impacts the plate directly, non-contacting jet that impacts a layer of liquid, collision of two axial jets and no evident jet. A detailed phase diagram for the bubble collapse pattern is given in a large parameter space. Through the comparison of bubble dynamics near a movable and a fixed plate, the FSI effect is found to induce a significant increase in the jet impact velocity and the corresponding impact pressure. We also give a criterion condition for neglecting the FSI effect. Finally, we find two scaling laws for the plate motion with respect to gamma, which can be explained using a semi-analytical model.

关键词： fluid-structure interaction Bubble dynamics Cavitation bubble Boundary integral simulation

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Investigation of fluid-structure interaction of fuel element in high speed and high temperature air cooled reactor

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ANNALS OF NUCLEAR ENERGY 2021年 160卷 108400-108400页

作者： Lu, Ruibo Qiu, Zhifang He, Yuhao Yang, Wen Li, Zhongchun Zhao, Fulong Tan, Sichao Harbin Engn Univ Coll Nucl Sci & Technol Harbin 150001 Heilongjiang Peoples R China Harbin Engn Univ Heilongjiang Prov Key Lab Nucl Power Syst & Equip Harbin 150001 Peoples R China Nucl Power Inst China Chengdu 610000 Sichuan Peoples R China

The high-speed and high-temperature air is the coolant of the open-cycle reactor. The state of air has effect on the dynamic characteristics of the fuel element which may do harm to the reactor. Therefore, the fluid-structure interaction of air and fuel element is studied. Firstly, the methods are validated. Subsequently, the physical properties and boundaries are determined. In addition, the effects of heat flux, inlet Mach number, temperature and pressure on the FSI characteristics of the fuel element are investigated. The results reveal that the heat flux, Mach number and temperature have effects on the dynamic characteristics indirectly. However, the effects on the deformation, force and stress can be ignored. The pressure has direct impact on the fluid force. There is no vibration with the fuel element when the flow is steady. The research can lay basis for the selection of the air flow state in the open-cycle reactor. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Dynamic characteristics Air-cooled reactor High-speed and high-temperature

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Experimental investigation on the fluid-structure interaction of a flexible net cage used to farm Pacific bluefin tuna (Thunnus orientalis)

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OCEAN ENGINEERING 2021年 226卷 108872-108872页

作者： Dong, Shuchuang You, Xinxing Hu, Fuxiang Univ Tokyo Inst Ind Sci 5-1-5 Kashiwanoha Kashiwa Chiba 2778574 Japan Tokyo Univ Marine Sci & Technol Dept Marine Biosci Minato Ku Tokyo 1088477 Japan

Resource protection of Pacific bluefin tuna (Thunnus orientalis) fish catching has become stringent over the past years. Meanwhile, tuna farming in Japan, the largest consumer of this fish, using a circular flexible net cage is continuously growing as a promising business. A stable aquaculture production of tuna can be achieved by understanding the characteristics, such as a clean environment and space in the net cage and flow inside and near the circular flexible net cage. We measured the drag force, cage deformation, and flow field inside and around a scaled net cage model composed of different bottom weights under various incoming current speeds in a flume tank. Results indicated that the drag force and cage volume increased and decreased, respectively, with the bottom weight. Owing to the significant deformation of the flexible net cage, a complex fluid-structure interaction occurred and a strong negative correlation between the drag force and cage volume was obtained. Furthermore, an area where the current speed was often reduced was identified. The intensity of this reduction depended on the incoming current speed. However, in particular cases, this reduction did not occur, or a local acceleration of the fluid was observed. In this work, the depth data of several positions on the net cage were also analyzed to verify if it could be used to estimate the cage volume. The findings of this study can be used to understand and design optimal flexible net cage structures, which can be used for modern aquaculture.

关键词： Drag force Cage volume Flexible net cage fluid-structure interaction Flow field distribution Pacific bluefin tuna

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Semi-active control of jacket platforms under wave loads considering fluid-structure interaction

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APPLIED OCEAN RESEARCH 2021年 117卷 1页

作者： Gavgani, Seyyed Ali Mousavi Jalali, Himan Hojat Farzam, Maziar Fahimi Univ Maragheh Fac Engn Dept Civil Engn Maragheh *** Iran Univ Texas Arlington Dept Civil Engn 425 Nedderman Hall416 Yates StBox 19308 Arlington TX 76019 USA

Jacket platforms are among the most used offshore platforms for energy extraction from seabed and are prone to failure caused by the inherent dynamic nature of wave loads. Therefore, vibration control of these structures with the goal of enhancing efficiency and preventing structural damage is of outmost importance. In current work, semi-active control of the Ressalat jacket platform using a large-scale magnetorheological (MR) damper with fuzzy logic controller is investigated with the aid of the computationally efficient modified endurance wave analysis (MEWA), considering waves with return periods of 2, 5, 10, 20, 50 and 100 years. The effect of number of dampers, fluid-structure interaction, added mass effects and actuator saturation has been simultaneously implemented in the current study. A total of six performance indices based on maximum and root mean square (RMS) of responses (inter-story displacement, velocity and acceleration) are used to assess the efficiency of the control method for waves with different intensities and return periods. Results of current analyses provide a comprehensive overview of the performance of the MR damper for the semi-active control of the Ressalat jacket platform under different wave loads with different return periods and show an acceptable performance for all the considered wave loads, with the goal of enhanced safety and increased service life.

关键词： Semi-active control Magnetorheological damper Modified endurance wave analysis (MEWA) Wave loading fluid-structure interaction

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An Immersed Boundary-Lattice Boltzmann Approach to Study Deformation and fluid-structure interaction of Hollow Sealing Strip

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ENERGIES 2021年第23期14卷 8110-8110页

作者： Shen, Zhe Yang, Zhigang Abbas, Munawwar Ali Yu, Haosheng Chen, Li Tongji Univ Postdoctoral Stn Mech Engn Shanghai 201804 Peoples R China Tongji Univ Shanghai Automot Wind Tunnel Ctr Shanghai 201804 Peoples R China Univ Baltistan Dept Math Skardu 16200 Pakistan

A combined immersed boundary-lattice Boltzmann approach is used to simulate the dynamics of the fluid-structure interaction of a hollow sealing strip under the action of pressure difference. Firstly, the multiple relaxation times LBM model, hyper-elastic material model and immersed boundary method were deduced. According to the strain characteristics of hyper-elastic materials and the specific situation of friction between the elastic boundary and solid boundary, the internal force and the external force on the immersed boundary were discussed and deduced, respectively. Then, a 2D calculation model of the actual hollow sealing strip system was established, during which technical problems such as the equivalent wall thickness of the sealing strip and the correction of the stiffness of the contact corner were solved. The reliability of the model was verified by comparing results of FEM simulation of quasi-static deformation. Following this, the simulation results of three typical cases of sealing strips were presented. The results show that when the sealing strip fails, there will be a strong coupling phenomenon between the flow field and the sealing strip, resulting in the oscillation of the flow field and the sealing strip at the same frequency.

关键词： immersed boundary method lattice Boltzmann method fluid-structure interaction hyper-elastic material friction

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3D numerical simulation of the gas detonation forming of aluminum tubes considering fluid-structure interaction and chemical kinetic model

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THIN-WALLED structureS 2021年 161卷 107469-107469页

作者： Rokhy, Hamid Mostofi, Tohid Mirzababaie Univ Eyvanekey Fac Mech Engn Eyvanekey Iran

The present study deals with the numerical simulation of the dynamic response of the pure aluminum AA1050 tube under internal gas mixture detonation loading. This practical topic involves structural large plastic deformation, fluid motion, and chemical reaction, and detonation wave/structure interaction. Therefore, the fluidstructure interaction (FSI) with finite-rate chemistry in compressible Conservation Element/Solution Element (CESE) solver with the Immersed Boundary Method (IBM) was used to model the real situation of the whole forming process. The numerical model was verified with existing experimental data for aluminum tubes under internal gas detonation of H2+O2 in terms of the pressure-time history and deformation pattern. Moreover, the simulation results were also compared to those numerical ones in the open literature. It is found that the current numerical modelling approach reproduces the experimental observations very well, and it has a more accurate prediction capability in comparison to the reported study. Hence, the present numerical approach can be used for the design of pressure vessels and piping systems subjected to internal gas detonation loading and also further studies on hazard analysis of pipeline explosion accidents. Moreover, the effect of ignition point location, double ignition points, initial pressure, and repeated loading on the response was investigated. The results show that an experimental setup with double ignition points gives a uniform distribution for plastic deformation in the longitudinal direction of the tube while the ignition point is located at a distance of 1/6 length of the tube from both ends. Furthermore, the double gas detonation loading at the low initial pressure of 0.85 MPa gives the same result obtained for single loading at the moderate initial pressure of 1.2 MPa.

关键词： Aluminum tube CESE-FSI IBM solver fluid-structure interaction Gas detonation forming Large plastic deformation

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A novel smoothed particle hydrodynamics and finite element coupling scheme for fluid-structure interaction: The sliding boundary particle approach

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2021年 383卷 113922-113922页

作者： Fuchs, Sebastian L. Meier, Christoph Wall, Wolfgang A. Cyron, Christian J. Tech Univ Munich Inst Computat Mech Boltzmannstr 15 D-85748 Garching Germany Hamburg Univ Technol Inst Continuum & Mat Mech Eissendolfer Str 42 D-21073 Hamburg Germany Helmholtz Zentrum Hereon Inst Mat Syst Modeling Max Planck Str 1 D-21502 Geesthacht Germany

A novel numerical formulation for solving fluid-structure interaction (FSI) problems is proposed where the fluid field is spatially discretized using smoothed particle hydrodynamics (SPH) and the structural field using the finite element method (FEM). As compared to fully mesh- or grid-based FSI frameworks, due to the Lagrangian nature of SPH this framework can be easily extended to account for more complex fluids consisting of multiple phases and dynamic phase transitions. Moreover, this approach facilitates the handling of large deformations of the fluid domain respectively the fluid-structure interface without additional methodological and computational efforts. In particular, to achieve an accurate representation of interaction forces between fluid particles and structural elements also for strongly curved interface geometries, the novel sliding boundary particle approach is proposed to ensure full support of SPH particles close to the interface. The coupling of the fluid and the structural field is based on a Dirichlet-Neumann partitioned approach, where the fluid field is the Dirichlet partition with prescribed interface displacements and the structural field is the Neumann partition subject to interface forces. To overcome instabilities inherent to weakly coupled schemes an iterative fixed-point coupling scheme is employed. Several numerical examples in form of well-known benchmark tests are considered to validate the accuracy, stability, and robustness of the proposed formulation. Finally, the filling process of a highly flexible thin-walled balloon-like container is studied, representing a model problem close to potential application scenarios of the proposed scheme in the field of biomechanics. (C) 2021 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Smoothed particle hydrodynamics Finite element method Iterative Dirichlet-Neumann coupling Large deformation Incompressible flow

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fluid-structure interaction AND HOMOGENIZATION: FROM SPATIAL AVERAGING TO CONTINUOUS WAVELET TRANSFORM 8

FLUID-STRUCTURE INTERACTION AND HOMOGENIZATION: FROM SPATIAL...

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8th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED)

作者： Mokhtari, S. Ricciardi, G. Faucher, V Argoul, P. Adelaide, L. CEA Cadarache DEN DTN STCP LTHC F-13115 St Paul Les Durance France CEA Cadarache DEN DTN F-13115 St Paul Les Durance France IFSTTAR MAST EMGCU 14-20 Blvd Newton F-77447 Marne La Vallee 2 France

ISBN: (纸本)9788494919459

fluid-structure interaction (FSI) is classicaly modeled according a separated and local approach. It enables to take full advantage of the numerical methods specifically designed for each medium. However, it requires to take great care of the interface, and to exchange, between the algorithms, the information related to boundary conditions [1]. This treatment of the interface can quickly become too cumbersome in complex flow geometries, as in the industrial case study driving this work: an inviscid compressible flow interacting with French PWR fuel assemblies (Fig. 1a). Copyright © The Authors.

关键词： fluid-structure interaction compressible flow spatial filtering multi-scale homogenization wavelets

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Performance of a Nitinol Honeycomb Stent for the Management of Atherosclerotic Aortic Plaque: Crimping, Sealing, and fluid-structure interaction Analysis

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JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 2021年第3期88卷 031013页

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

We present the results of a computational study to investigate the performance of a nitinol honeycomb stent used in the management of an aortic atherosclerotic plaque with 70% stenosis. Such is considered severe and is associated with a higher risk of cardiovascular death. Traditionally, plaque size, composition, shape, and location are thought as important factors in determining the potential for the plaque to rupture (aka plaque vulnerability). The study looks at two plaque shapes and two plaque compositions. The stent used in the simulations is our own design. It compresses and expands due to nitinol's superelastic property. The human aorta is represented by the Gasser-Ogden-Holzapfel (GOH) model, a sophisticated hyperelastic model which accounts for the dispersion of fibers present in the tissues. We proceed to investigate how the stent-aorta-plaque structure behaves under a physiological blood flow. Results indicate that the stent as designed can sustain realistic blood flow conditions and that hypocellular plaques are more prone to rupture, in agreement with results published in the literature. It also shows that neither plaque composition nor shape affect the wall shear stress (WSS). This study can be useful to surgeons to identify regions of stenotic aorta subjected to high stress, to select the appropriate stent diameter for aortae with plaques with various compositions and plaque shapes, and to decide on the optimal site for stent implantation.

关键词： nitinol stent superelasticity crimping sealing stress plaque fluid-structure interaction wall shear stress

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High fidelity fluid-structure interaction by radial basis functions mesh adaption of moving walls: A workflow applied to an aortic valve

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JOURNAL OF COMPUTATIONAL SCIENCE 2021年 51卷 101327-101327页

作者： Geronzi, Leonardo Gasparotti, Emanuele Capellini, Katia Cella, Ubaldo Groth, Corrado Porziani, Stefano Chiappa, Andrea Celi, Simona Biancolini, Marco Evangelos ANSYS Inc 35-37 Rue Louis Guerin Villeurbanne France Fdn Toscana G Monasterio Heart Hosp BioCardioLab Bioengn Unit Massa Italy Univ Roma Tor Vergata Dept Enterprise Engn Mario Lucertini Rome Italy

fluid-structure interaction (FSI) can be investigated by means of non-linear Finite Element Models (FEM), suitable to capture large deflections of structural parts interacting with fluids, and Computational fluid Dynamics (CFD). High fidelity simulations are obtained using the fine spatial resolution of both the structural and fluid computational grids. A key enabler to have a proper exchange of information between the structural solver and the fluid one is the management of the interface at wetted surfaces where the grids are usually non matching. A class of applications, known also as one-way FSI problems, involves a complex movement of the walls that is known in advance as measured or as computed by FEM, and that has to be imposed at the boundaries during a transient CFD solution. Effective methods for the time marching adaption of the whole computational grid of the CFD model according to the evolving shape of its boundaries are required. A very well established approach consists of a continuum update of the mesh that is regenerated by adding and removing cells to fit the evolution of the moving walls. In this paper, starting from the work originally presented in Meshfree Methods in Computational Sciences, ICCS 2020 [1], an innovative method based on Radial Basis Functions (RBF) mesh morphing is proposed, allowing the retention of the same mesh topology suitable for a continuum update of the shape. The proposed method is exact at a set of given key configurations and relies on shape blending time interpolation between key frames. The study of the complex motion of a Polymeric-Prosthetic Heart Valve (P-PHV) is presented using the new framework and considering as a reference the established approach based on remeshing.

关键词： Morphing Radial basis functions Multi-physics fluid-structure interaction Polymeric aortic valve

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