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An explicit velocity correction-based immersed boundary-hybrid lattice Boltzmann flux solver for fluid-structure interaction with large solid deformation

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OCEAN ENGINEERING 2023年第1期270卷

作者： Yan, Haoran Zhang, Guiyong Rao, Honghua Song, Hong Sun, Zhe Dalian Univ Technol Sch Naval Architecture Engn State Key Lab Struct Anal Ind Equipment Dalian 116024 Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explora Shanghai 200240 Peoples R China COSCO SHIPPING Heavy Ind Co Ltd Tech Inst Dalian 116113 Peoples R China Ocean Univ China Coll Engn Qingdao 266100 Peoples R China

In this work, an explicit velocity correction-based Immersed Boundary-Hybrid Lattice Boltzmann Flux Solver (IBHLBFS) is developed for fluid-structure interaction (FSI) problems with large solid deformation in twodimensional. The fluid domain is solved by the Lattice Boltzmann Flux Solver (LBFS) while the solid domain is solved by the Smoothed Point Interpolation Method (S-PIM). For coupling the two methods, the Explicit Velocity Correction (EVC) is developed and applied to both the fluid and the solid by implementing the Immersed Boundary Method (IBM). The fluid domain in IB-HLBFS can be discretized with non-uniform mesh so that the efficiency is improved meanwhile the accuracy is ensured compared with the original Lattice Boltzmann Method (LBM). Moreover, the explicit velocity correction simplifies the matrix inversion in the Implicit Velocity Correction (IVC) hence the efficiency is further improved. To show the advantages and the reliability of the present IB-HLBFS, the numerical simulations of flow past the elastic beam, flow past a circular cylinder with a flexible beam behind, and swimming of a self-propelled fishlike body are given to show the application of IBHLBFS in FSI with complex fluid dynamics and large solid deformation. The results indicate that the present method is advantageous in terms of efficiency and accuracy, and has a wide prospect in engineering applications as well.

关键词： Lattice Boltzmann flux solver Smoothed point interpolation method Immersed boundary method Explicit velocity correction fluid-structure interaction

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APolygonal Discontinuous Galerkin Formulation for Contact Mechanics in fluid-structure interaction Problems

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Communications in Computational Physics 2021年第6期30卷 1-33页

作者： Stefano Zonca Paola FAntonietti Christian Vergara MOX Dipartimento di MatematicaPolitecnico di MilanoItaly LABS Dipartimento di ChimicaMateriali e Ingegneria Chimica“Giulio Natta”Politecnico di MilanoItaly

In this work,we propose a formulation based on the Polygonal Discontinuous Galerkin(PolyDG)method for contact mechanics that arises in fluid-structure interaction *** particular,we introduce a consistent penalization approach to treat the frictionless contact between immersed structures that undergo large *** key feature of the method is that the contact condition can be naturally embedded in the PolyDG formulation,allowing to easily support polygonal/polyhedral *** proposed approach introduced a fixed background mesh for the fluid problem overlapped by the structure grid that is able to move independently of the fluid *** assess the validity of the proposed approach,we report the results of several numerical experiments obtained in the case of contact between flexible structures immersed in a fluid.

关键词： Polygonal Discontinuous Galerkin method fluid-structure interaction contact mechanics

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A nodal position finite element model for fluid-structure interaction analysis of floating bodies with mooring

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OCEAN ENGINEERING 2023年第1期279卷

作者： Tonin, Mateus Guimaraes Braun, Alexandre Luis Univ Fed Rio Grande do Sul Programa Posgrad Engn Civil Av Osvaldo Aranha 99 BR-90035190 Porto Alegre RS Brazil

A numerical model based on the Nodal Position Finite Element Method (NPFEM) is proposed in this work for fluid-structure interaction (FSI) analysis of moored bodies subject to multiphase free surface flows. The semiimplicit CBS (Characteristic-Based Split) method is utilized here for discretization of the flow fundamental equations in the context of the Finite Element Method, where linear tetrahedral elements are adopted. Turbulence is analyzed using Large Eddy Simulation (LES) with the dynamic sub-grid scale model and the Level Set method is utilized for simulation of multiphase free surface flows. The structural system is modeled using a threedimensional rigid body approach for the floating object, while the mooring is discretized using a geometrically nonlinear cable formulation based on the NPFEM. A partitioned coupling scheme is adopted for fluid-structure interaction analysis taking into account the fluid-structure and cable-structure couplings, where the flow equations are kinematically described employing an Arbitrary Lagrangean-Eulerian (ALE) formulation with a numerical scheme for mesh motion. The algorithms constituting the numerical model are verified first considering classical applications on fluid dynamics and FSI, in addition to applications involving the dynamic analysis of cables. Finally, problems involving floating bodies with and without mooring are simulated to demonstrate the applicability and accuracy of the proposed numerical model.

关键词： Floating structures fluid-structure interaction Free surface flows Computational fluid dynamics CBS Method Nodal position finite element method

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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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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

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

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APPLIED OCEAN RESEARCH 2021年 113卷

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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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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Structural optimization of H-type VAWT blade under fluid-structure interaction conditions

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JOURNAL OF VIBROENGINEERING 2021年第5期23卷 1207-1218页

作者： Zhang, Xu Wang, Zituo Li, Wei Tiangong Univ Tianjin Key Lab Adv Mechatron Equipment Technol Tianjin 300387 Peoples R China Tianjin Chengjian Univ Sch Energy & Safety Engn Tianjin 300384 Peoples R China

To reduce the errors caused by the rigid body hypothesis in the aerodynamics-structure coupling calculation and improve the structural performance, an optimum structure design with the consideration of the fluid-structure interaction are performed for the H-type vertical axis wind turbine (VAWT) blade. Based on the ANSYS Workbench platform, the geometric model, computational domain and grids of the wind wheel are constructed, the turbulence model, boundary conditions and composite material layers are set up, and the fluid and solid domains are solved in a coupled way. The single-objective structural optimization model in which the thicknesses of glass clothes, foam and gel coat, and the positions of two webs are taken as design variables is solved using the response surface optimization method to minimize the wind wheel mass. The frequencies and vibration modes of original and optimized blades with and without pre-stress and the transient characteristics of wind wheels in different wind speeds are investigated. The results indicate that after the blade optimization, the first-order frequency and critical speed become larger and other frequencies reduce for the static, single pre-stress and multiple pre-stresses states, and the maximum displacement, stress and strain of the wind wheel decrease under rated and extreme wind speeds, confirming significant performance improvements. The research provides useful guidance for the integrated design of structure and aerodynamics of wind turbine blades.

关键词： H-type vertical axis wind turbine blade structural optimization fluid-structure interaction

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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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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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