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Computational fluid-structure interaction Analysis of Piston Pin Multiphase Elastohydrodynamic Lubrication With Unsteady Flow Channel Variation

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JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 2023年第2期145卷 021603-021603页

作者： Narumi, Yudai Ishimoto, Jun Kanayama, Daisuke Kuribara, Hiroshi Nakano, Yoshikatsu Toyota Motor Co Ltd 1 Toyota Cho Toyota Aichi 4718571 Japan Tohoku Univ Inst Fluid Sci Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan Honda Motor Co Ltd 3-15-1 Sensui Asaka Saitama 3518555 Japan

This research focuses on the multiphase oil film tribology between the piston pin and the connecting rod in an internal combustion engine and establishes a new computational approach for thin-film lubrication with unsteady flow channel variation. First, the pin and the connecting rod are considered as rigid bodies, and 3D numerical analysis of the cavitating lubricating oil flow is performed when combustion load is applied to the pin. We find that dynamic pressure does not increase around the connecting rod edge and that pressure is potentially insufficient to support the load. In the second numerical analysis, the pin and the connecting rod are considered to be elastically deformable structures, and coupled 3D multiphase fluid-structure interaction simulation is performed. The boundary lubrication area is detected using a statistical Greenwood-Tripp model as unevenness of the contacted metal surface. The results show that pressure distribution spreads more widely than in the result for rigid bodies and that the film was thicker as well. Also, the pin deformed like a bow, but the deformation of the connecting rod was quite small, suggesting a potential mechanical contact at the edge of the connecting rod with the pin. By comparison with an actual operationally used piston pin, we find that the fluid-structure coupled analysis qualitatively predicted the seizure location.

关键词： elastohydrodynamic lubrication fluid-structure interaction cavitation asperity contact coupled computing cavitation fluid film lubrication hydrodynamic lubrication surface roughness and asperities thermoelastohydrodynamic lubrication viscosity

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Analysis of the immersed boundary method for turbulent fluid-structure interaction with Lattice Boltzmann method

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JOURNAL OF COMPUTATIONAL PHYSICS 2023年第1期492卷

作者： Cheylan, Isabelle Fringand, Tom Jacob, Jerome Favier, Julien Aix Marseille Univ CNRS Cent Marseille M2P2UMR 7340 F-13451 Marseille 13 France

An efficient and new methodology to deal with fluid structure interaction at high Reynolds number flows is presented in this article. It relies on the coupling of the lattice Boltzmann method and the immersed boundary method with a second order predictor corrector model for the structure. The effect of the lagrangian weight of the immersed boundary method is also analyzed in the context of fluid structure interaction. Both curved and moving boundaries are considered, and several methods to calculate the lagrangian weight are compared on relevant test-cases: the laminar flow around a cylinder at Reynolds number Re = 100, the Poiseuille flow in a 2D channel and a 3D fluid-structure interaction test case: a deformable flapping flag immersed in a laminar flow. A convergence study in space and time is performed and the three following parameters are investigated: the number of lagrangian markers along the boundary, the value of the lagrangian weight and the shape of the discrete delta function used in the immersed boundary. Finally, the novelty of the paper is two-fold: a new expression of the lagrangian weight which is found to reduce the error by 20% in the case of fluid-structure interaction, and the coupling of a turbulence model with a second order predictor corrector model for improved stability and accuracy. This numerical methodology is found here to be accurate for challenging cases with high added mass effect and high Reynolds number flows.& COPY;2023 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Lattice-Boltzmann method Immersed-boundary method Lagrangian weight Predictor-corrector Large eddy simulation

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fluid-structure interaction for the flexible filament's propulsion hanging in the free stream

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JOURNAL OF MOLECULAR LIQUIDS 2021年 323卷 114941-114941页

作者： Afra, B. Delouei, A. Amiri Mostafavi, M. Tarokh, A. Lakehead Univ Fac Sci & Environm Studies Thunder Bay ON Canada Univ Bojnord Dept Mech Engn Bojnord Iran Shahrood Univ Technol Dept Mech Engn Shahrood Iran Lakehead Univ Dept Mech Engn Thunder Bay ON Canada

In this study, a successful hybrid model is presented for the simulation of flow induced vibrations. The novel fluid-structure interaction framework relies on split-forcing Lattice Boltzmann Method (LBM) and Immersed Boundary Method (IBM), which are combined with a novel explicit Lattice Spring Model (LSM). The solver is validated against two benchmarks which include fluid interacting with a rigid cylinder and a finned circle attached in the middle of a channel. The role of flexibility on the filaments flapping in a free-stream at different Reynolds numbers is investigated. It is found that for a single filament flapping in a fluid flow, increasing flexibility do not always increases vibration amplitudes and can surprisingly decrease fluctuations if flexibility exceed a specific value. This interplay stems from flapping frequencies as they approach the natural frequency of the filament, creating resonance. Also, fluid structure interaction of three side-by-side filaments with different separate distancing values Dp/L in the free-stream are studied in the results section. The data highlights that for the Dp/L < 0.2 case, filaments act as a single filament while larger values form diffuser and nozzle shapes, which affect the fluid flow acceleration. Finally, we investigate the effects of separation distance has for the case in which filaments are arranged linearly. It is found that filaments can be synchronized to propel in phase with the same frequency if particular gaps are considered between filaments. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Flexible filaments fluid-structure interaction Numerical methods development Flow-induced vibration

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fluid-structure interaction: Insights into biomechanical implications of endograft after thoracic endovascular aortic repair

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COMPUTERS IN BIOLOGY AND MEDICINE 2021年 138卷 104882-104882页

作者： Qiao, Yonghui Mao, Le Ding, Ying Zhu, Ting Luo, Kun Fan, Jianren Zhejiang Univ State Key Lab Clean Energy Utilizat 38 Zheda Rd Hangzhou 310027 Peoples R China Fudan Univ Zhongshan Hosp Dept Vasc Surg Shanghai Peoples R China Fudan Univ Zhongshan Hosp Dept Radiol Shanghai Peoples R China

Thoracic endovascular aortic repair (TEVAR) has developed to be the most effective treatment for aortic diseases. This study aims to evaluate the biomechanical implications of the implanted endograft after TEVAR. We present a novel image-based, patient-specific, fluid-structure computational framework. The geometries of blood, endograft, and aortic wall were reconstructed based on clinical images. Patient-specific measurement data was collected to determine the parameters of the three-element Windkessel. We designed three postoperative scenarios with rigid wall assumption, blood-wall interaction, blood-endograft-wall interplay, respectively, where a two-way fluid-structure interaction (FSI) method was applied to predict the deformation of the composite stentwall. Computational results were validated with Doppler ultrasound data. Results show that the rigid wall assumption fails to predict the waveforms of blood outflow and energy loss (EL). The complete storage and release process of blood flow energy, which consists of four phases is captured by the FSI method. The endograft implantation would weaken the buffer function of the aorta and reduce mean EL by 19.1%. The closed curve area of wall pressure and aortic volume could indicate the EL caused by the interaction between blood flow and wall deformation, which accounts for 68.8% of the total EL. Both the FSI and endograft have a slight effect on wall shear stress-related-indices. The deformability of the composite stent-wall region is remarkably limited by the endograft. Our results highlight the importance of considering the interaction between blood flow, the implanted endograft, and the aortic wall to acquire physiologically accurate hemodynamics in post-TEVAR computational studies and the deformation of the aortic wall is responsible for the major EL of the blood flow.

关键词： Thoracic endovascular aortic repair Aortic endograft Windkessel model fluid-structure interaction Computational fluid dynamics

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Optical Coherence Tomography-Based Patient-Specific Residual Multi-Thrombus Coronary Plaque Models With fluid-structure interaction for Better Treatment Decisions: A Biomechanical Modeling Case Study

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JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME 2021年第9期143卷 091003-091003页

作者： Wang, Liang He, Luping Jia, Haibo Lv, Rui Guo, Xiaoya Yang, Chun Giddens, Don P. Samady, Habib Maehara, Akiko Mintz, Gary S. Yu, Bo Tang, Dalin Southeast Univ Sch Biol Sci & Med Engn Nanjing 210096 Peoples R China Harbin Med Univ Affiliated Hosp 2 Dept Cardiol Harbin 150086 Peoples R China Nanjing Univ Posts & Telecommun Sch Sci Nanjing 210023 Peoples R China China United Network Comm Co Ltd Network Technol Res Inst Beijing 100048 Peoples R China Worcester Polytech Inst Dept Math Sci Worcester MA 01609 USA Emory Univ Sch Med Dept Med Atlanta GA 30307 USA Georgia Inst Technol Wallace H Coulter Dept Biomed Engn Atlanta GA 30332 USA Columbia Univ Cardiovasc Res Fdn New York NY 10022 USA

Intracoronary thrombus from plaque erosion could cause fatal acute coronary syndrome (ACS). A conservative antithrombotic therapy has been proposed to treat ACS patients in lieu of stenting. It is speculated that the residual thrombus after aspiration thrombectomy would influence the prognosis of this treatment. However, biomechanical mechanisms affecting intracoronary thrombus remodeling and clinical outcome remain largely unknown. in vivo optical coherence tomography (OCT) data of a coronary plaque with two residual thrombi after antithrombotic therapy were acquired from an ACS patient with consent obtained. Three OCT-based fluid-structure interaction (FSI) models with different thrombus volumes, fluid-only, and structure-only models were constructed to simulate and compare the biomechanical interplay among blood flow, residual thrombus, and vessel wall mimicking different clinical situations. Our results showed that residual thrombus would decrease coronary volumetric flow rate by 9.3%, but elevate wall shear stress (WSS) by 29.4% and 75.5% at thrombi 1 and 2, respectively. WSS variations in a cardiac cycle from structure-only model were 12.1% and 13.5% higher at the two thrombus surfaces than those from FSI model. Intracoronary thrombi were subjected to compressive forces indicated by negative thrombus stress. Tandem intracoronary thrombus might influence coronary hemodynamics and solid mechanics differently. Computational modeling could be used to quantify biomechanical conditions under which patients could receive patient-specific treatment plan with optimized outcome after antithrombotic therapy. More patient studies with follow-up data are needed to continue the investigation and better understand mechanisms governing thrombus remodeling process.

关键词： intracoronary thrombus fluid-structure interaction optical coherence tomography hemodynamics structural mechanics

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Study on axial-torsional dynamics characteristics of the drilling robot based on a fluid-structure interaction model

GEOENERGY SCIENCE AND ENGINEERING

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GEOENERGY SCIENCE AND ENGINEERING 2023年 229卷

作者： Zhao, Jianguo Fang, Shiji Xiao, Xiaohua Zhao, Xin Yang, Ruifan Han, Shuo Southwest Petr Univ Sch Mechatron Engn Chengdu 610500 Sichaun Peoples R China Chengdu Univ Technol State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610059 Sichuan Peoples R China CNPC Chuanqing Drilling Engn Co Ltd Drilling & Prod Technol Res Inst Guanghan 618300 Sichuan Peoples R China

During conventional oil and gas well drilling, weight on bit (WOB) and torque are measured and controlled at the wellhead. However, due to significant transmission lag in thousands of meters long wells, accurate control is unattainable resulting in extremely low drilling efficiency. A novel approach utilizing a coiled tubing drilling (CTD) robot for real-time control of bottom hole WOB and indirect torque regulation via WOB manipulation is proposed. To achieve automatic control, it is imperative to conduct a thorough study of the CTD robot's dynamic characteristics. Through the study, the fluid-structure interaction model of axial torsional dynamics was established for the first time. The factors, including BHA, screw performance, bit performance, rate of penetration (ROP) equation, torque equation, rheological characteristics of drilling fluid and other relevant aspects were comprehensively considered. The effects of drilling fluid displacement (DFD) and WOB fluctuations on the torsional vibration characteristics of the CTD robot system were analyzed. It was found that DFD fluctuation frequency are the main controlling factors affecting the axial torsional dynamic characteristics. By keeping the fluctuation frequency of DFD much higher than 19 Hz, the amplitude and instability of bit vibration can be effectively suppress. This research is beneficial for controlling WOB with CTD robot and suppressing the vibration of the drill bit.

关键词： fluid-structure interaction Axial torsional dynamics Coiled tubing Downhole tractor

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Wing Deformation of an Airborne Wind Energy System in Crosswind Flight Using High-Fidelity fluid-structure interaction

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ENERGIES 2023年第2期16卷 602页

作者： Pynaert, Niels Haas, Thomas Wauters, Jolan Crevecoeur, Guillaume Degroote, Joris Univ Ghent Fac Engn & Architecture Dept Electromech Syst & Met Engn Sint Pietersnieuwstr 41 B-9000 Ghent Belgium Flanders Make Core Lab MIRO B-9000 Ghent Belgium

Airborne wind energy (AWE) is an emerging technology for the conversion of wind energy into electricity. There are many types of AWE systems, and one of them flies crosswind patterns with a tethered aircraft connected to a generator. The objective is to gain a proper understanding of the unsteady interaction of air and this flexible and dynamic system during operation, which is key to developing viable, large AWE systems. In this work, the effect of wing deformation on an AWE system performing a crosswind flight maneuver was assessed using high-fidelity time-varying fluid-structure interaction simulations. This was performed using a partitioned and explicit approach. A computational structural mechanics (CSM) model of the wing structure was coupled with a computational fluid dynamics (CFD) model of the wing aerodynamics. The Chimera/overset technique combined with an arbitrary Lagrangian-Eulerian (ALE) formulation for mesh deformation has been proven to be a robust approach to simulating the motion and deformation of an airborne wind energy system in CFD simulations. The main finding is that wing deformation in crosswind flights increases the symmetry of the spanwise loading. This property could be used in future designs to increase the efficiency of airborne wind energy systems.

关键词： airborne wind energy fluid-structure interaction computational fluid dynamics Chimera

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Seismic experiments on short coaxial multi-layered cylindrical shells with fluid-structure interaction in fast reactors

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ANNALS OF NUCLEAR ENERGY 2023年 194卷

作者： Zhao, Fei Lu, Daogang Liu, Qiang Zhang, Chaofan Wang, Mingzheng Liu, Yu Zhou, Yixian North China Elect Power Univ Sch Nucl Sci & Engn Beijing 102206 Peoples R China North China Elect Power Univ Beijing Key Lab Pass Safety Technol Nucl Energy Beijing 102206 Peoples R China China Inst Atom Energy Beijing 102413 Peoples R China

As the most important component of pool-type fast reactors, the main vessel contains most of the equipment for the primary circuit and thousands of tons of liquid sodium. The fluid-structure interaction effects of the coaxial multi-layer thin-walled cylindrical shells formed by the main vessel and its thermal shield cannot be neglected. Though the research on the fluid-structure interaction of the liquid in the pool is sufficient, the research on the short coaxial multi-layer cylindrical shells is not enough, especially the axial and circumferential mode shapes and the ratio of each mode under seismic conditions. So, it is necessary to study the fluid-structure interaction of short coaxial multilayer shells. This paper presents shaking table tests performed on double- and triple-layered cylindrical shells to investigate fluid-structure interaction and seismic response, respectively. The experiments reveal that when the aspect ratio is less than 2, Mode (1,6) exhibits the most significant response under sine wave excitation conditions, while Mode (1,1) demonstrates the highest response under seismic conditions. The first three modes are characterized as out-of-phase modes. Additionally, the pressure component of the first circumferential mode contributes 20% to the overall response of the first 12 modes under seismic conditions.

关键词： fluid added mass Multi-layered cylindrical shells Pool-type fast reactors fluid-structure interaction

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fluid-structure interaction effects on the deformable and pitching plate dynamics in a fluid flow

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APPLIED OCEAN RESEARCH 2021年 113卷 1页

作者： Brousseau, Paul Benaouicha, Mustapha Guillou, Sylvain Segula Technol Naval & Energy Engn Res & Innovat Unit 19 Rue Arras F-92000 Nanterre France Univ Caen Normandy Cherbourg Univ Lab Appl Sci LUSAC 60 Rue Max Pol Fouchet F-50130 Octeville France

This study presents a numerical investigation of a 2D flexible flat plate dynamics, immersed in a fluid flow with a Reynolds number, based on its chord, of 2000. The plate is animated by a forced sinusoidal pitching movement, whose amplitude is 10 circle from its leading edge. Various materials are considered for the structure, from rigid materials to more flexible ones. The fluid-structure interaction (FSI) effects are taken into account using a partitioned implicit coupling scheme. The Arbitrary Lagrangian-Eulerian (ALE) formulation of the Navier-Stokes equations is applied and the anisotropic diffusion equation is solved to determine the displacements of the fluid domain mesh. The numerical results are validated with experimental ones. A good agreement with the experimental results is obtained. Afterwards, it is shown that under the considered dynamics of the plate, the flexibility of the structure tends to increase the lift and the drag but decrease the thrust. In addition, this produces an acceleration of the fluid flow in the wake of the plate.

关键词： fluid-structure interaction Strong coupling Numerical simulation Flexible flat plate dynamics Pitching movement Hydrodynamic load

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A high-order fluid-structure interaction framework with application to shock-wave/turbulent boundary-layer interaction over an elastic panel

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JOURNAL OF fluidS AND structureS 2023年第1期121卷

作者： Gao, Min Appel, Daniel Beck, Andrea Munz, Claus-Dieter Univ Stuttgart Inst Aerodynam & Gas Dynam Pfaffenwaldring 21 D-70569 Stuttgart Germany

Within this work, a loosely-coupled high-order fluid-structure interaction (FSI) framework is developed in order to investigate the influence of an elastic panel response on shock-wave/turbulent boundary-layer interaction (SWTBLI). Since high-order methods are expected to determine the future of high-fidelity numerical simulations, they are employed in the construction of both fluid and structure solvers. Specifically, a split form arbitrary Lagrangian-Eulerian discontinuous Galerkin spectral element method is employed in the fluid solver and a Legendre spectral finite element method in the structure solver. Shock capturing by an improved adaptive filter method, which confines the filtering effect to the vicinity of shocks, is found to be well-behaved in accuracy, efficiency and *** being validated by two benchmark FSI problems, the developed FSI framework is applied to simulate SWTBLI over an elastic panel. A comparison with a previous simulation of SWTBLI over a rigid panel reveals that: (1) A larger amplitude of the pressure variation, observed on the elastic panel surface, implies a larger threat to the structural integrity;(2) The shock-induced separation flow over the elastic panel changes both in size and shape, leading to a different skin-friction coefficient distribution;(3) A new low-frequency flow unsteadiness of the same magnitude as the elastic panel vibration is detected, which may affect the flow dynamics inside the turbulent boundary layer.& COPY;2023 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Discontinuous Galerkin method Shock capturing Legendre spectral finite element methods Implicit large eddy simulation Shock-wave turbulent boundary-layer interaction

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