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ASME 43rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Pathak, Keshav Saha, Nilanjan Indian Inst Technol Madras Chennai Tamil Nadu India

ISBN: (纸本)9780791887844

The submerged floating tunnel (SFT) is a long tunnel that remains suspended below the water surface at a considerable depth of around 100-150 m and connects to land masses separated by 'deep' and vast water bodies. The present study aims to characterize the flow dynamics around an excessive buoyant type SFT with a circular cross-section. In this paper, one-way fluid-structure interaction analysis is carried out to analyze the dynamic behavior of SFT under current action. Computational fluid Dynamics (CFD) is implemented to perform a 2D numerical simulation of flow around the SFT cross-section. The k - omega SST turbulence model is implemented to capture the turbulence flow around the structure. The hydrodynamic load from the CFD solver is then sequentially transferred as a uniformly distributed transient load to a structural solver to study the dynamic behavior of the SFT tube segment. In structural solver, only a part of the structure separated by mooring lines at two ends (or SFT tube segment) is considered. Here, the structure is modelled as a Euler-Bernoulli's beam, discretized as line body elements, and supported by linear vertical springs equivalent to mooring lines at two ends. The structural response of the SFT tube segment and the flow pattern around the structure are discussed and validated from the literature.

关键词： Submerged Floating Tunnel Computational fluid dynamics fluid-structure interaction Dynamic analysis Vortex-Induced Vibration

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fluid-structure interaction and band gap analysis of periodic composite liquid-filled pipe

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COMPOSITE structureS 2023年第Part2期304卷

作者： Wu, Jiang-hai Sun, Yu-dong Su, Ming-zhu Zhu, Hong-zhen China Ship Sci Res Ctr Natl Key Lab Ship Vibrat & Noise Wuxi 214082 Peoples R China Wuxi Univ Fac Sci Dept Phys Wuxi 214045 Peoples R China

This paper studies the vibration band gap characteristics of a liquid-filled composite pipeline. The transfer matrix method is used to create a one-dimensional fluid-structure interaction model of the composite pipeline from the constitutive equation, physical equations, and boundary conditions of the anisotropic material. A phononic crystal pipeline is designed with a periodic arrangement on the axial pipe wall. The method used to analyze the fluid-structure interaction of liquid-filled composite and phononic crystal pipelines is verified by comparing responses with finite-element method results. The results' agreement demonstrates the method's and calculation code's correctness. Furthermore, the band gaps for an empty composite phononic crystal pipe, water hammer, and a liquid-filled pipe are calculated by Bloch vector theory, and the effects of fluid-structure interaction and the composite parameters on the three band gap characteristics are analyzed. The numerical results show that Poisson's coupling affects the band gap at some frequency points, while the laying angle and fiber volume fraction in the composite pipe influence the band gap length and amplitude change. The research results of this paper provide a reference for the design and vibration control of liquid-filled composite pipelines.

关键词： fluid-structure interaction Phononic crystal Vibration band gap Composite material

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Experimental Investigation of fluid-structure interaction of composite hydrofoils in cavitating flow

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Journal of Hydrodynamics 2022年第2期34卷 207-213页

作者： Hou-sheng Zhang Zhi-pu Guo Qin Wu Han-zhe Zhang Guo-yu Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China Aviation Engineering School Air Force Engineering UniversityXian710038China

This paper experimentally studies the cavitating fluid-structure interaction of composite hydrofoils with different ply *** synchronous measurement system with high-speed camera and for laser Doppler vibrometer(LDV),the feedback pressure regulation system,and the flow rate control system are *** experimental results of the cavitation evolution show that,compared with the rigid hydrofoil,the composite hydrofoils with+45°ply angle and 0°ply angle accelerate the cavitation inception,and the composite hydrofoil with−45°ply angle delays the cavitation *** the same cavitation number,the cloud cavitation of the+45°laminated hydrofoil is the most severe,followed by that of the 0°laminated hydrofoil,and that of the−45°laminated hydrofoil is relatively weak and close to that of the rigid *** analyses of the structural vibration of the composite hydrofoils in different cavitation stages show that the three composite hydrofoils have no significant vibration at the incipient cavitation and the supercavitation,but relatively significant vibration is observed in the sheet and cloud *** vibration amplitude of the composite hydrofoil with+45°ply angle is the largest,followed by those of the−45°,0°laminated *** the sheet cavitation,the dominant frequencies of the structural vibration velocity of the+45°laminated hydrofoil and the−45°laminated hydrofoil are the first and second modal frequencies,but no explicit dominant frequency is observed for the 0°laminated *** the cloud cavitation,the dominant frequencies of the three composite hydrofoils mainly include the first modal frequency,the second modal frequency,and the cavity shedding frequency.

关键词： Cavitation fluid-structure interaction composite hydrofoil cavity induced vibration

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A Three-Dimensional fluid-structure interaction Model for Platelet Aggregates Based on Porosity-Dependent Neo-Hookean Material 24th

A Three-Dimensional Fluid-Structure Interaction Model for Pl...

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24th International Conference on Computational Science (ICCS)

作者： Hao, Yue Hoekstra, Alfons G. Zavodszky, Gabor Univ Amsterdam Fac Sci Informat Inst Computat Sci Lab Amsterdam Netherlands Budapest Univ Technol & Econ Dept Hydrodynam Syst Budapest Hungary

ISBN: (纸本)9783031637858;9783031637834

The stability of the initial platelet aggregates is relevant in both hemostasis and thrombosis. Understanding the structural stresses of such aggregates under different flow conditions is crucial to gaining insight into the role of platelet activation and binding in the more complex process of clot formation. In this work, a three-dimensional implicit partitioned fluid-structure interaction (FSI) model is presented to study the deformation and structural stress of platelet aggregates in specific blood flow environments. Platelet aggregates are considered as porous mediums in the model. The FSI model couples a fluid solver based on Navier-Stokes equations and a porosity-dependent compressible neo-Hookean material to capture the mechanical characteristics of the platelet aggregates. A parametric study is performed to explore the influence of porosity and applied body force on this material. Based on in vitro experimental data, the deformation and associated stress of a low shear aggregate and a high shear aggregate under different flow conditions are evaluated. This FSI framework offers a way to elucidate the complex interaction between blood flow and platelet aggregates and is applicable to a wider range of porous biomaterials in flow.

关键词： Compressible neo-Hookean fluid-structure interaction Porosity Platelet aggregate

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fluid-structure interaction characteristics of inflatable reentry aeroshell at subsonic speed

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AEROSPACE SCIENCE AND TECHNOLOGY 2023年第1期133卷

作者： Saha, Sanjoy Kumar Tobari, Junki Takahashi, Yusuke Oshima, Nobuyuki Moriyoshi, Takahiro Yamada, Kazuhiko Shibata, Ryoichi Hokkaido Univ Kita 13 Nishi 8Kita Ku Sapporo Hokkaido 0608628 Japan Japan Aerosp Explorat Agcy 3-1-1 Yoshinodai Chuo Ku Sagamihara Kanagawa 2525210 Japan Gifu Coll Natl Inst Technol 2236-2 Kamimakuwa Motosu Gifu 5010461 Japan

Inflatable aeroshells, made of flexible membranes and pressurized inflatable torus, experience significant aerodynamic loads during atmospheric entry. The aerodynamic forces deform the lightweight, flexible membrane, and such deformation changes the flow field, changing the aerodynamic characteristics and increasing the deformation even further. Thus, fluid-structure coupled modeling of these problems is crucial for the reliable performance prediction of such reentry vehicles. This study provides wind tunnel experimental results on subsonic fluid-structure interaction (FSI), focusing on the aeroshell deformation and oscillatory behavior designed to validate coupled simulations. Wind tunnel experiments were conducted using a scaled membrane aeroshell model for subsonic speed. Aerodynamic coefficients, pressures at the rear of the model, and structural vibrations were measured for freestream Mach number of 0.3. A two-way coupled FSI model was set up in a partitioned manner for analyzing detailed distributions of the flow field properties, which was validated by the experimental data. The model was based on the open-source fluid solver OpenFOAM, computational structural solver CalculiX and coupling library preCICE. The present FSI analysis model well reproduced fundamental features such as swing motion, membrane deformation, and the wake in the flow field simulation, which were observed in the experiment. The results indicated that the membrane surface deforms elastically by aerodynamic force caused by the large pressure difference between the front and rear sides of the vehicle. The continuous generation and shedding of the wake vortex caused unsteady behavior in the flow field, followed by the small amplitude oscillation of the aeroshell. An external aerodynamic force caused the oscillation because the frequency of this oscillation did not correspond to that of natural frequencies.(c) 2023 Elsevier Masson SAS. All rights reserved.

关键词： Computational fluid dynamics Atmospheric entry fluid-structure interaction Oscillation Subsonic flow

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Eulerian finite volume formulation using Lagrangian marker particles for incompressible fluid-structure interaction problems

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2022年第5期123卷 1294-1328页

作者： Shimada, Tokimasa Nishiguchi, Koji Bale, Rahul Okazawa, Shigenobu Tsubokura, Makoto RIKEN Ctr Computat Sci RIKEN Kobe Hyogo Japan Kobe Univ Grad Sch Syst Informat Dept Computat Sci Kobe Hyogo Japan Nagoya Univ Dept Civil & Environm Engn Nagoya Aichi Japan Univ Yamanashi Fac Engn Div Mech Engn Kofu Yamanashi Japan

We propose a monolithic fluid-structure interaction (FSI) method that uses the cell-centered finite volume formulation in the Eulerian description, Lagrangian marker particles allocated in the solid region, and the incompressible mixture formulation. In the proposed method, we compute all the basic equations and spatial derivatives, except the solid constitutive equations, on an Eulerian mesh to avoid neighboring particle search. Although full Eulerian methods that use a Cartesian mesh are attractive for FSI problems that require large-scale computing and include complex geometries and the large deformation of the solid, they cannot avoid the numerical dissipation of the interfaces or internal variables of the solid caused by their advection. This computational problem has been a barrier to the industrial application of full Eulerian mesh methods. In the numerical examples, we confirmed that the proposed method retains sharp interfaces, such as the corners of a square solid, and yields more accurate numerical results for the deformation, energy, and incompressibility of a solid in fluid than our conventional Eulerian FSI method.

关键词： Cartesian mesh collocated finite volume method Eulerian formulation fluid-structure interaction Lagrangian marker particles monolithic coupling

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Estimating external tissue support parameters with fluid-structure interaction models from 4D ultrasound of murine thoracic aortae

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ENGINEERING WITH COMPUTERS 2022年第5期38卷 4005-4022页

作者： Shidhore, Tanmay C. Cebull, Hannah L. Madden, Megan C. Christov, Ivan C. Rayz, Vitaliy L. Goergen, Craig J. Purdue Univ Sch Mech Engn 585 Purdue Mall W Lafayette IN 47907 USA Purdue Univ Weldon Sch Biomed Engn 206 S Martin Jischke Dr W Lafayette IN 47907 USA

Modeling of fluid-structure interactions (FSIs) between the deformable arterial wall and blood flow is necessary to obtain physiologically realistic computational models of cardiovascular systems. However, lack of information on the nature of contact between the outer vessel wall and surrounding tissue presents challenges in prescribing appropriate structural boundary conditions. Imaging techniques used to visualize wall deformation in vivo may be useful for estimating simulation parameters that capture the effects of both vascular composition and surrounding tissue support on the vessel wall displacement. Here, we present a method to calibrate external tissue support parameters in FSI simulations against four-dimensional ultrasound (4DUS) of the murine thoracic aortae. We collected ultrasound, blood pressure, and histological data from several mice infused with angiotensin II (n = 4) and created a representative model of healthy and diseased (at 28 days post-angiotensin II infusion) murine aortae. We ran pulsatile FSI simulations after accounting for increased arterial wall stiffness with varying levels of tissue support, which demonstrated non-trivial variation in not only structural quantities, such as vessel wall deformation, but also hemodynamic quantities, such as wall shear stress across simulations. Furthermore, we compared simulation results with in vivo 4DUS imaging data and observed that the suitable range of the tissue support spring parameter was identical for both healthy and diseased states. This indicated that the same tissue support parameter estimates could be used for modeling the healthy and diseased states of the vessel, provided that changes in arterial wall stiffness had been considered. We anticipate this technique and the tissue support estimates reported herein will help inform computational models of blood flow and vasculature that incorporate the influence of external tissue. [GRAPHICS] .

关键词： Murine model Thoracic aorta fluid-structure interaction Ultrasound Computational fluid dynamics Arterial wall deformation

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Understanding the fluid-structure interaction from wave diffraction forces on CALM buoys: numerical and analytical solutions

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SHIPS AND OFFSHORE structureS 2022年第11期17卷 2545-2573页

作者： Amaechi, Chiemela Victor Wang, Facheng Ye, Jianqiao Univ Lancaster Dept Engn Lancaster LA1 4YR England Stand Org Nigeria Son Standardisat Directorate 52 Lome CrescentWuse Zone 7 Abuja 900287 Nigeria Tsinghua Univ Dept Civil Engn Beijing 100084 Peoples R China

This research fills the gap in understanding fluid-structure interaction (FSI) from wave diffraction forces on CALM buoys and cylindrical structures, based on the hydrodynamics with connections. Recently, there is an increased application of (un)loading marine hoses for Catenary Anchor Leg Moorings (CALM) buoy systems in the offshore industry due to the need for more flexible marine structures that are cost-saving, easier to install, and service. However, different operational issues challenge these hoses, like during hose disconnection. Also, the fluid behaviour was investigated based on the analytical and numerical models. The numerical modelling involves the boundary element method (BEM) and Orcaflex line theory. Hydrodynamic analysis is conducted on the disconnection-induced load response of marine bonded hoses during normal operation and accidental operation under irregular waves. A comparative study on hose performance during normal operation and accidental operation is also presented. Results of statistical analysis on CALM buoy system shows good motion characteristics.

关键词： Wave diffraction forces marine bonded hose ocean waves hydrodynamics disconnection-induced load Catenary Anchor Leg Mooring (CALM) buoy fluid-structure interaction

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Development, verification, and validation of comprehensive acoustic fluid-structure interaction capabilities in an open-source computational platform

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EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 2022年第10期51卷 2188-2219页

作者： Dhulipala, Somayajulu L. N. Bolisetti, Chandrakanth Munday, Lynn B. Hoffman, William M. Yu, Ching-Ching Mir, Faizan Ul Haq Kong, Fande Lindsay, Alexander D. Whittaker, Andrew S. Idaho Natl Lab Computat Mech & Mat Idaho Falls ID 83402 USA Idaho Natl Lab Adv Reactor Technol & Design Idaho Falls ID 83402 USA Univ Buffalo Dept Civil Struct & Environm Engn Buffalo NY USA Idaho Natl Lab Computat Frameworks Idaho Falls ID 83402 USA

The acoustic fluid-structure interaction (FSI) formulation is a practical numerical approach for the seismic analysis of fluid-filled tanks. However, there are no verification and validation studies reported in the literature that demonstrate the ability of an acoustic FSI numerical model to predict responses important to structural and mechanical design for intense translational and rotational earthquake inputs. Herein, an acoustic FSI formulation is implemented in the open-source Multiphysics Object-Oriented Simulation Environment (MOOSE), and is formally verified and validated using analytical solutions and code-to-code verification, and experimental data, respectively. The analytical solutions are for small amplitude, unidirectional seismic inputs. The code-to-code verification utilizes a previously verified and validated Arbitrary Lagrangian-Eulerian (ALE) numerical model in the commercial finite element code LS-DYNA. The validation studies utilize a comprehensive data set assembled from results of 3D earthquake-simulator tests of a fluid-filled vessel. The acoustic numerical model in MOOSE is verified and validated for hydrodynamic pressures and support reactions except for cases that involve significant convective response. For small amplitude inputs, numerically predicted wave heights match those of the analytical solutions. The numerical model is not verified and validated for wave height calculations under intense 3D seismic inputs. The run times for the acoustic FSI simulations in MOOSE are an order of magnitude, or more, shorter than for the corresponding ALE simulations in LS-DYNA. The utility of the MOOSE acoustic FSI implementation is demonstrated by seismic analysis of a building equipped with a fluid-filled, advanced nuclear reactor.

关键词： advanced nuclear reactors experimental validation fluid-structure interaction multiphysics simulations numerical model verification seismic analysis

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Effect of plaque compositions on fractional flow reserve in a fluid-structure interaction analysis

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2022年第1期21卷 203-220页

作者： Wu, Chulin Liu, Xiujian Ghista, Dhanjoo Yin, Youbin Zhang, Heye Sun Yat Sen Univ Sch Biomed Engn Shenzhen 518107 Peoples R China Univ 2020 Fdn Northborough MA 01532 USA Shenzhen Keya Med Technol Corp Shenzhen 518172 Peoples R China

Coronary artery disease involves the reduction of blood flow to the myocardium due to atherosclerotic plaques. The findings of myocardial ischemia may indicate severe coronary stenosis, but many studies have demonstrated a mismatch between lumen stenosis and fractional flow reserve (FFR). Recently, some clinical studies have found that the composition of atherosclerotic plaques may be a potential missing link between stenosis and ischemia. To investigate the relationship between myocardial ischemia and plaque composition, we have developed and adopted a new fluid-structure interaction (FSI) patient-specific coronary plaque model, based on computed tomography angiography data, to assess the impact on FFR as a biomechanical indicator of ischemia. A total of 180 analyses have been performed in 3D-FSI coronary artery disease models based on plaque compositions, plaque location, and stenosis degree. Hemodynamic analysis of simulation results and comparisons with other methods has been conducted to validate our models. Our results have successfully verified that the different compositions of plaques have resulted in differences in the calculated FFR. The mean FFR values with lipid plaques are (0.727 +/- 0.109) as compared to the mean FFR values in lesions with fibrous plaques (0.695 +/- 0.115, P = 0.019) and calcified plaques (0.682 +/- 0.115, P < 0.001). Besides, FFR differences between the three different plaque compositions have been shown to increase as the diameter stenosis increased. Plaque composition affects vascular stiffness and vascular dilation ability, and thereby affects the stenosis degree, resulting in abnormal FFR leading to myocardial ischemia. This interrelationship can help to diagnose the cause of high-risk coronary artery disease, leading to myocardial ischemia.

关键词： Plaque compositions Coronary stenosis Fractional flow reserve fluid-structure interaction Coronary atherosclerosis Myocardial ischemia Stenosis diameter

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