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Conservative immersed-type algorithm with a Cartesian grid-based smoothed finite element method for the 2D fluid-structure interaction

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2024年 431卷

作者： Huo, S. H. Hong, Y. Wang, G. Jiang, C. Liu, G. R. Li, Z. Q. Taiyuan Univ Technol Coll Aeronaut & Astronaut Taiyuan 030024 Peoples R China Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China Cent South Univ Sch Traff & Transportat Engn Key Lab Traff Safety Track Minist Educ Changsha 410076 Peoples R China Univ Cincinnati Dept Aerosp Engn & Engn Mech Cincinnati OH 45221 USA

The Cartesian grid, which is highly popular in Computational fluid Dynamics (CFD), has the characteristics of high mesh quality and easy generation. However, due to the limit of shape functions, the Cartesian grid with hanging nodes (CGHN) was rarely used in finite element method based CFD algorithm. Based on the framework of the immersed boundary method, a smoothed finite element method based on CGHN is developed for the fluid-structure interaction problems in incompressible fluids and large deformed structures. The gradient smoothing technique simplifies the processing of the hanging nodes and ensures the mesh density of the Cartesian elements. When solving the nonlinear N-S equations, the characteristic-based split format is combined with the stabilized pressure gradient projection to overcome the convection and pressure oscillations in the Galerkin-like method. A heterogeneous mesh mapping technology is developed for the data transfer between fluid and solid domains. An efficient, accurate and generalized mass conservation algorithm is developed to solve the pressure oscillations in data transfer between fluids and solids. The results of numerical examples show that the presented method possesses high accuracy and robustness.

关键词： Cartesian grid with hanging nodes Smoothed finite element method Computational fluid dynamics fluid-structure interaction Gradient smoothing technique

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3d fluid-structure interaction simulation with an Arbitrary-Lagrangian-Eulerian approach with applications to flying objects

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ENGINEERING WITH COMPUTERS 2024年 1-23页

作者： Di Cristofaro, Daniele Frangi, Attilio Cremonesi, Massimiliano Politecn Milan Dept Civil & Environm Engn Piazza Leonardo Vinci 32 I-20133 Milan Italy

Air-structure interaction is a key aspect to account for during the design of Micro Air Vehicles. In this context, modelisation and numerical simulations represent a powerful tool to analyse aerodynamic performances. This work proposes an advanced fluid-structure interaction numerical technique for the simulation of dragonfly wings, considered one of the most interesting model due to their complex flapping kinematic. The fluid subproblem, described by incompressible Navier-Stokes equations, is solved in a Finite Element Arbitrary-Lagrangian-Eulerian framework, while the solid subproblem is addressed using structural Finite Element, such as membranes and beams. Moreover, a novel remeshing algorithm based on connectivity manipulation and refinement procedure has been implemented to reduce element distortion in fluid mesh, thus increasing the accuracy of the fluid solution. Firstly, the deformation of a single hindwing has been studied. Secondly, the dragonfly model is enriched by incorporating the forewing and a simplified thorax geometry. Preliminary results highlight the complex dynamic of the fluid around the body as well as the efficiency of the proposed mesh generation algorithm.

关键词： fluid-structure interaction Arbitrary-Lagrangian-Eulerian Structural Finite Elements Remeshing Technique Flying Objects

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Computational fluid-structure interaction framework for passive feathering and cambering in flapping insect wings

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2024年第4期96卷 435-481页

作者： Ishihara, Daisuke Onishi, Minato Kyushu Inst Technol Dept Intelligent & Control Syst 680-4 Kawazu Iizuka Fukuoka 8208502 Japan Kyushu Inst Technol Dept Comp Sci & Syst Engn Iizuka Fukuoka Japan

In flapping insect wings, veins support flexible wing membranes such that the wings form feathering and cambering motions passively from large elastic deformations. These motions are essentially important in unsteady aerodynamics of insect flapping flight. Hence, the underlying mechanism of this phenomenon is an important issue in studies on insect flight. Systematic parametric studies on strong coupling between a model wing describing these elastic deformations and the surrounding fluid, which is a direct formulation of this phenomenon, will be effective for solving this issue. The purpose of this study is to develop a robust numerical framework for these systematic parametric studies. The proposed framework consists of two novel numerical methods: (1) A fully parallelized solution method using both algebraic splitting and semi-implicit scheme for monolithic fluid-structure interaction (FSI) equation systems, which is numerically stable for a wide range of properties such as solid-to-fluid mass ratios and large body motions, and large elastic deformations. (2) A structural mechanics model for insect flapping wings using pixel modeling (pixel model wing), which is combined with explicit node-positioning to reduce computational costs significantly in controlling fluid meshes. The validity of the proposed framework is demonstrated for some benchmark problems and a dynamically scaled model incorporating actual insect data. Finally, from a parametric study for the pixel model wing flapped in fluid with a wide range of solid-to-fluid mass ratios, we find a FSI mechanism of feathering and cambering motions in flapping insect wings. We developed a novel computational framework that consists of a fully parallelized solution method using algebraic splitting and semi-implicit scheme for monolithic FSI equation systems, the parallel CG method, and a pixel model wing combined with explicit *** the proposed framework, we found that feathering and cambering mot

关键词： cambering feathering fluid-structure interaction insect flapping flight passive mechanism pixel model

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Dynamic analysis of whipping behavior induced by the circumferential fracture of high energy pipes considering fluid-structure interaction effect

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INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 2024年 212卷

作者： Wang, Yuhan Hu, Jincheng Wang, Xiaochuan Wu, Shijing Wuhan Univ Sch Power & Mech Engn Wuhan 430072 Peoples R China Wuhan Univ Hubei Key Lab Waterjet Theory & New Technol Wuhan 430072 Peoples R China

To analyze the dynamic characteristics of whipping behavior induced by the circumferential fracture of high energy pipes, a numerical model of the piping system was presented based on the bidirectional fluid-structure interaction method. The reliability of this model was validated against experimental results. Furthermore, the dynamic characteristics of whipping behavior were studied, as well as the effects of some main parameters. The numerical results suggest that the entire whipping behavior can be divided into four stages: free-whipping stage I, free-whipping stage II, collision stage and periodic stage. The dynamic response of whipping behavior is different in the four stages and is dominated by a single mode with a frequency of 29.35 Hz under the combined action of the thrust force and U-bolt restraints. The increase of inlet flow rate causes the enhancement of thrust force and thus makes its dynamic response more complicated. The parameter analysis shows that the whipping behavior can be suppressed by choosing the small initial clearance, setting the suitable gap and increasing the straight segment length of U-bolt restraints. The above results are helpful to understand the dynamic characteristics of whipping behavior and provide valuable suggestions for the optimization of the protection measures.

关键词： Whipping behavior Circumferential fracture High energy pipes fluid-structure interaction U -bolt restraints Numerical simulation

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Simulation of fluid-structure interaction using the boundary data immersion method with adaptive mesh refinement

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2024年第7期96卷 1156-1169页

作者： Wang, Yuan Ge, Wei Chinese Acad Sci Inst Proc Engn State Key Lab Mesosci & Engn Beijing Peoples R China Univ Chinese Acad Sci Sch Chem Engn Beijing Peoples R China

The fluid-structure interaction is simulated using the boundary data immersion method. As the fluid-structure interface is smeared in the smoothing region, deviations are incurred in fluid simulations. For compressible flow, high order difference schemes with more mesh cells for the stencils are usually employed to achieve high overall accuracy, but near interfaces it requires wider smoothing region of several mesh cells for computational stability and hence lowers its accuracy significantly. To address this issue, the proposed algorithm switches to lower order difference schemes near the interfaces and applies adaptive mesh refining there to compensate the accuracy loss. Implemented with structured Adaptive Mesh Refinement Application Infrastructure (SAMRAI), the algorithm shows notable improvement in the overall accuracy and efficiency in cases such as channel flow and flow past a cylinder. The algorithm is used to simulate the shock wave past a fixed or free cylinder with Ma =2.67$$ =2.67 $$ and Re =1482$$ =1482 $$, which reveals the relaxation process and the temporal evolution of the drag coefficient, it goes through a valley and maintains at relatively high value for the fixed cylinder, while that of the free cylinder tends to decrease in fluctuation which is found to be caused by the interaction between the forward moving cylinder and vortexes in the unsteady wake. The boundary data immersion method smears the fluid-structure interface in the smoothing region and incurs deviations. The proposed algorithm switches to lower order difference schemes near the interfaces and applies adaptive mesh refining there to compensate the accuracy loss. image

关键词： adaptive mesh refinement boundary data immersion method compressible flow fluid-structure interaction

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The fluid-structure interaction during blood flow in a flexible stenotic thoracic aorta: Numerical study

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COMPUTERS & MATHEMATICS WITH APPLICATIONS 2024年 165卷 39-51页

作者： Issakhov, Alibek Sabyrkulova, Aidana Abylkassymova, Aizhan Kazakh British Tech Univ Alma Ata Kazakhstan Al Farabi Kazakh Natl Univ Alma Ata Kazakhstan

A detailed study of the effect of coarctation on the blood flow of the thoracic aorta was carried out by modeling the interaction between blood and the aortic wall. fluid-structure interaction (FSI) simulations were performed on the thoracic aorta geometries of healthy and diseased patients obtained from medical images. The pulsating flow of non-Newtonian blood was set by the boundary condition for the velocity in the form of a periodic physiological wave depending on time. As a result, the parameters of blood flow and vessel deformation were evaluated. It is shown that the velocity value at the site of aortic narrowing increases and falls after the narrowing. In addition, it can be noted that the value of pressure in the healthy aorta was higher than in the aorta with CoA, but at the same time, the pressure in the CoA model increased after the coarctation zone. It was noted that the shear stresses for the two models showed little difference and WSS was overestimated in the diseased aorta. As can be seen from the obtained data, using numerical simulation, important characteristics were determined to assess the influence of the fluid-structure interaction during blood flow in the flexible stenotic thoracic aorta.

关键词： Numerical simulation fluid-structure interaction Pulsatile Stenosis Thoracic aorta Flexible wall

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Aerodynamic performance of BFRP bionic plate wind turbine blade based on fluid-structure interaction analysis

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WIND AND structureS 2024年第4期39卷 243-258页

作者： Zheng, Tengteng Zhao, Caiqi Shang, Lijie Southeast Univ Key Lab Concrete & Prestressed Concrete Struct Minist Educ Nanjing 211189 Jiangsu Peoples R China Southeast Univ Sch Civil Engn Nanjing 211189 Jiangsu Peoples R China Univ Queensland Sch Civil Engn St Lucia Qld 4072 Australia

In this paper, the aerodynamic performance of the Basalt Fiber Reinforced Polymer (BFRP) bionic plate wind turbine blade with different pitch angles, incoming wind speeds and rotational speeds was investigated. The influence of the tower shadow effect on the wake velocity, aerodynamic load, displacement and stress of BFRP bionic plate wind turbine blade under the rated condition was obtained by establishing the whole machine model including tower tube, and the error analysis of the simplified calculation formula of aerodynamic load was carried out. Results show that the incoming wind speed has a great influence on the stress and wind speed backflow and the tower shadow effect has a great influence on the horizontal thrust and torque of BFRP bionic plate wind turbine blade. The simplified calculation formula of aerodynamic load can accurately simulate the displacement and stress trend of BFRP bionic plate wind turbine blade and the recommended values of the pitch angle, incoming wind speed and the rotational speed of BFRP bionic plate wind turbine blade were given. The research results can provide the dynamic parameter reference for the engineering design of BFRP bionic plate wind turbine blade.

关键词： aerodynamic performance BFRP bionic plate fluid-structure interaction offshore wind turbine blade tower shadow effect

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Numerical discretization errors of fluid-structure interaction model in pressurized pipeline systems

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APPLIED MATHEMATICAL MODELLING 2025年 142卷

作者： Huang, Hai Guo, Pengcheng Yan, Jianguo Xian Univ Technol Sch Water Resources & Hydroelect Engn Xian 710048 Peoples R China Xian Univ Technol State Key Lab Ecohydraul Northwest Arid Reg Xian 710048 Peoples R China

The fluid-structure interaction (FSI) effects in pressurized pipeline systems may induce pipe vibrations, leading to more severe water hammer incidents. Therefore, establishing an FSI model for liquid-filled pipelines and developing efficient and accurate numerical simulation methods are crucial. These advancements enable precise prediction of FSI water hammer phenomena, which is essential for the design and protection of pressurized pipeline systems. When using the FSI four-equation axial model for water hammer calculations, techniques such as space-line interpolation (SLI), time-line interpolation (TLI), or wave speed adjustment (WSA) are commonly employed for grid processing. However, these techniques inevitably introduce additional numerical discretization errors. Existing literatures have primarily conducted quantitative analyses by comparing numerical results of different grid processing techniques with exact solutions or experimental data, lacking a theoretical analysis. To address this gap, this study establishes an equivalent hyperbolic differential equations (EHDE) approach for numerical discretization error analysis of the FSI four-equation axial model. EHDEs for SLI, TLI, and WSA are specifically derived to analyze how these techniques generate numerical discretization errors and the factors influencing these errors during the solution process. Theoretical findings are validated through numerical case studies. The results indicate that SLI introduces non-physical numerical dissipation terms into the fluid equations of the FSI four-equation axial model. TLI transforms a single fluid pressure wave into a superposition of two pressure waves with different wave speeds, causing additional numerical dissipation and dispersion due to this non-physical superposition. WSA introduces numerical errors when adjusting wave speeds artificially. Among the three grid processing techniques, SLI exhibits the highest sensitivity to grid resolution, followed by TLI, while W

关键词： Pressurized pipeline Water hammer fluid-structure interaction Four-equation axial model Equivalent hyperbolic differential equations

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Two-way coupling fluid-structure interaction analysis on dynamic response of offshore wind turbine

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MARINE GEORESOURCES & GEOTECHNOLOGY 2024年第11期42卷 1677-1686页

作者： Li, Fen Fu, Jiaojiao Chen, Jiahui Hu, Dan Wuhan Univ Technol Sch Naval Architecture Ocean & Energy Power Engn Wuhan Peoples R China Wuhan Univ Technol Key Lab High Performance Ship Technol Minist Educ Wuhan Peoples R China Tianma Microelect Co Ltd Shenzhen Peoples R China Wuhan Univ Technol Sch Naval Architecture Ocean & Energy Power Engn Dept Struct Engn Wuhan Peoples R China

The monopile-supported offshore wind turbines (OWTs) are subjected to the wave and current loadings. Affected by currents and waves, monopile-supported OWTs are also vulnerable to scour. However, the effect of scour and currents on the dynamic behavior of the monopile are not fully appreciated. This study conducted the model tests to evaluate the effect of scour depth and flow velocity on the lateral responses of support structure. Furthermore, the two-way (T-W) coupling fluid-structure interaction (FSI) method was proposed to evaluate the dynamic responses of piles in sand. The support structure is modeled using ABAQUS, a finite-element models software package, by considering the nonlinear soil-structure interaction effects, STAR-CCM + tools has been employed to model the FSI which are fed into ABAQUS to predict the structure's dynamic response. Using the proposed method, a parametric study has been conducted to evaluate the effects of scour depths, flow velocities on the dynamic responses of OWTs. The results indicate that scour altered the fundamental frequency of OWT, causing resonance. An increase in scour depth and flow velocity increased the dynamic responses of support structure, which are detrimental for the safety and stability of the OWT system.

关键词： Offshore wind turbine support structure model test dynamic response fluid-structure interaction

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Research on the Process of Dispersing the Bullet by a Large-Size Gasbag with Multiple Inlet Nozzles Based on the fluid-structure interaction Method

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INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES 2024年第2期25卷 449-459页

作者： Wang, Jian Liu, Rui Jiang, Kun Song, Daquan Nanjing Univ Sci & Technol Sch Energy & Power Engn Nanjing 210094 Peoples R China Res Inst CAS 8511 Nanjing 210007 Peoples R China Aviat Ammunit Inst Ltd Co NORINCO Grp Harbin 150030 Peoples R China

To meet the needs of the airborne dispenser to disperse large-mass bullets, the dispersal system of large-size gasbag with multiple inlet nozzles was designed and built. The rationality and feasibility of the dispersal system were verified by the experimental study of the interior ballistic process. On this basis, the fluid-structure interaction method was used to simulate and analyze the process of the gasbag propelling the bullet when the number of inlet nozzles is different. The calculation results show that the final shape of the expanded gasbag is pillow shaped, and wrinkles appear at the ends of the long side and in the middle of the short side of the gasbag. The stress at the wrinkles is relatively large, and the stress on the wall of the gasbag with three inlet nozzles is greater than that on the wall of the gasbag with two inlet nozzles. Affected by the changes of flow field in the gasbag and the deformation of the gasbag, the process of the gasbag propelling the bullet is divided into two stages, and there are also two large fluctuation peaks during the change of the acceleration of the bullet. Moreover, the expansion process of gasbag with two inlet nozzles lags behind that of the gasbag with three inlet nozzles, and the maximum acceleration and separation velocity of the bullet are also relatively reduced by 2% and 3%, respectively.

关键词： Dispersal system Large-size gasbag Interior ballistic fluid-structure interaction

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