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fluid-structure interaction analysis of a 1000 MW supercritical Coal-Fired boiler Water-Cooled wall based on Multi-parameter simulation

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APPLIED THERMAL ENGINEERING 2025年 274卷

作者： Li, Bingying Gao, Jiale Wang, Chenjiang Han, Huan Wang, Xingsheng Li, Shiyuan Univ Sci & Technol Beijing Beijing Peoples R China China Special Equipment Inspect & Res Inst Beijing Peoples R China

During the operational process of boiler units, a sudden drop in flow rate may lead to abrupt changes in the temperature and stress of the water-cooled wall, thereby accelerating the formation of cracks. In this paper, we firstly analyzed the thermal stress and deformation distribution within the steam section of a 1000 MW boiler's water-cooled wall under varying loads using numerical simulation. The results indicate that as the boiler load increases, stress and deformation levels within the water-cooled wall also rise. Subsequently, this study investigated the fluctuations in mass flow rate impact on the stress and deformation distributions of water-cooled wall due to a sudden decrease in flow rate within a single pipe under 100 % BMCR (Base Maximum Continuous Rating) load conditions. It is observed that when the single pipe flow rate fluctuates, lower flow rates correspond to more rapid increases in pipe temperature, at a flow rate of 100 kg/m2 center dot s, peak temperature reaches approximately 926.2 K, with a maximum deformation of 7.14 mm, and stress exceeds 600 MPa. Constraints on the backfire side can restrict the free expansion of pipe bundles across certain flow rates (at 1000 kg/m2 center dot s), surpassing the deformation of the water-cooled wall and reducing the peak stress. However, at extremely low flow rates (at 100 kg/m2 center dot s), backfire side constraints may promote the peak stresses further still. Furthermore, variations in the arrangement of pipes with flow rate changes influence the temperature, deformation, and stress distributions, and adjacent multi-pipes experiencing a flow plunge show more dramatic results relative to interval multi-pipes.

关键词： Coal-fired boiler Peak shifting Flow of water-cooled wall Thermal stress fluid-structure interaction

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fluid-structure interaction VIBRATION EXPERIMENTS AND NUMERICAL VERIFICATION OF A REAL MARINE PROPELLER

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POLISH MARITIME RESEARCH 2021年第3期28卷 61-75页

作者： Lou, Benqiang Cui, Hongyu Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang Jiangsu Peoples R China Dalian Univ Technol Sch Naval Architecture Engn State Key Lab Struct Anal Ind Equipment Dalian Peoples R China Jiangsu Univ Sci & Technol Changhui Rd 666 Zhenjiang 212003 Jiangsu Peoples R China

The design of lifting blade shapes is a key engineering application, especially in domains such as those of marine propellers, hydrofoils, and tidal energy converters. In particular, the excitation frequency must be different from that of the structure to avoid resonance. The natural frequency in the cases where the fluid-structure interaction (FSI) is considerably different if considering the coupling added mass (AM) of the water. In this study, vibration experiments were performed using a real propeller in air and water. The modal parameters, natural frequencies, and mode shapes were determined. Validations were performed using 3D solid and acoustic elements in a direct coupling finite element format. The modal results and AM ratios were in agreement with the experimental results. Convenient application and high efficiency are basic requirements for an engineering application. Therefore, an empirical formula was established for the first-order FSI natural frequency to enable rapid estimation, thereby satisfying this requirement.

关键词： fluid-structure interaction Real propeller vibration experiments Direct coupling Finite element method Added mass ratios

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fluid-structure interaction Modeling of Elastohydrodynamically Lubricated Line Contacts

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JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 2021年第9期143卷 091602页

作者： Singh, Kushagra Sadeghi, Farshid Russell, Thomas Lorenz, Steven J. Peterson, Wyatt Villarreal, Jaret Jinmon, Takumi School of Mechanical Engineering Purdue University West Lafayette IN 47907 Cummins Distinguished Professor of Mechanical Engineering School of Mechanical Engineering Purdue University West Lafayette IN 47907 Toyota Motor North America R&D 1555 Woodridge Avenue Ann Arbor MI 48105 Toyota Motor North America R&D 1555 Woodridge Avenue Ann Arbor MI 48105

This paper presents a partitioned fluid-structure interaction (FSI) solver to model elastohydrodynamic lubrication (EHL) of line contacts. The FSI model was constructed using the multiphysics simulation software ansys, wherein an iterative implicit coupling scheme is implemented to facilitate the interaction between fluid and solid components. The model uses a finite volume method (FVM) based computational fluid dynamics (CFD) solver to determine the lubricant flow behavior using the Navier-Stokes equations. Additionally, the finite element method (FEM) is utilized to model the structural response of the solid. fluid cavitation, compressibility, non-Newtonian lubricant rheology, load balance algorithm, and dynamic meshing were incorporated in the FSI model. The pressure and film thickness results obtained from the model are presented for a wide range of loads, speeds, slide to roll ratios (SRR), surface dent, material properties (elastic plastic), etc. The model presents a detailed understanding of EHL contacts by removing any assumptions relative to the Reynolds equation. It provides the (i) two-dimensional variation of pressure, viscosity, etc., in the fluid and (ii) stress, elastic/plastic strain in the solid, simultaneously. The FSI model is robust, easy to implement, and computationally efficient. It provides an effective approach to solve sophisticated EHL problems. The FSI model was used to investigate the effects of surface dents, plasticity and material inclusions under heavily loaded lubricated line contacts as can be found in gears and rolling element bearings. The results from the model exhibit excellent corroboration with published results based on the Reynolds equation solvers.

关键词： fluid-structure interaction elastohydrodynamic lubrication gears rolling element bearings CFD rolling contact fatigue bearings

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fluid-structure interaction-based aerodynamic modeling for flight dynamics simulation of parafoil system

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NONLINEAR DYNAMICS 2021年第4期104卷 3445-3466页

作者： Zhu, Hong Sun, Qinglin Liu, Xuefeng Liu, Jinglei Sun, Hao Wu, Wannan Tan, Panlong Chen, Zengqiang Nankai Univ Coll Artificial Intelligence Tianjin 300350 Peoples R China Beijing Inst Space Mech & Elect Beijing 100094 Peoples R China China Aerosp Sci & Technol Corp Lab Aerosp Entry Descent & Landing Technol Beijing 100094 Peoples R China Chinese Acad Sci Inst Mech Beijing 100190 Peoples R China

Prediction of aerodynamic force is a crucial issue for parafoil canopy as the strong nonlinear fluid-structure interaction (FSI) between the flexible canopy material and flow field. Flight tests and wind tunnel experiments are difficult to analyze the aerodynamics of parafoil because of the limitation and difficulty of data measurement in an unknown environment. The objective of this study was to computationally derive the aerodynamic characteristics of parafoil, as an alternative to expensive and unrepeatable test regimes. Different from previous works that assume canopy structure as a rigid body and serve for the design of parafoil, this study focused on the precise dynamic modeling of parafoil based on FSI simulations. To investigate the aerodynamic performance of the full-scale canopy with stabilizers for better control, the strong coupling FSI simulations were performed using the incompressible computational fluid dynamics techniques. The highlight of this paper is to explore the effects of canopy inflation and trailing edge deflections on aerodynamic performance. Then the aerodynamic coefficients are identified by a linear regression method using the obtained database of high fidelity lift and drag forces. Furthermore, an accurate six-degree-of-freedom dynamic model of the parafoil system is implemented based on the estimated coefficients. Simulations are conducted to prove the dynamic stability of the model and the feasibility of trajectory tracking. At last, simulation results of basic motions are compared with airdrop testing data, which demonstrates that the established model is capable of accurately predicting the flight behaviors of the parafoil system.

关键词： fluid-structure interaction Parafoil system Flexible deformation Trailing edge deflection Aerodynamic performance Dynamic model

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fluid-structure interaction study for biomechanics and risk factors in Stanford type A aortic dissection

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2023年第8期39卷 e3736页

作者： Wang, Xiaochen Ghayesh, Mergen H. Kotousov, Andrei Zander, Anthony C. Dawson, Joseph A. Psaltis, Peter J. Univ Adelaide Sch Mech Engn Adelaide SA 5005 Australia Royal Adelaide Hosp Dept Vasc & Endovasc Surg Adelaide SA Australia Royal Adelaide Hosp Trauma Surg Unit Adelaide SA Australia Univ Adelaide Adelaide Med Sch Adelaide SA Australia SAHMRI Vasc Res Ctr Lifelong Hlth Theme Adelaide SA Australia Cent Adelaide Local Hlth Network Dept Cardiol Adelaide SA Australia

Aortic dissection is a life-threatening condition with a rising prevalence in the elderly population, possibly as a consequence of the increasing population life expectancy. Untreated aortic dissection can lead to myocardial infarction, aortic branch malperfusion or occlusion, rupture, aneurysm formation and death. This study aims to assess the potential of a biomechanical model in predicting the risks of a non-dilated thoracic aorta with Stanford type A dissection. To achieve this, a fully coupled fluid-structure interaction model was developed under realistic blood flow conditions. This model of the aorta was developed by considering three-dimensional artery geometry, multiple artery layers, hyperelastic artery wall, in vivo-based physiological time-varying blood velocity profiles, and non-Newtonian blood behaviours. The results demonstrate that in a thoracic aorta with Stanford type A dissection, the wall shear stress (WSS) is significantly low in the ascending aorta and false lumen, leading to potential aortic dilation and thrombus formation. The results also reveal that the WSS is highly related to blood flow patterns. The aortic arch region near the brachiocephalic and left common carotid artery is prone to rupture, showing a good agreement with the clinical reports. The results have been translated into their potential clinical relevance by revealing the role of the stress state, WSS and flow characteristics as the main parameters affecting lesion progression, including rupture and aneurysm. The developed model can be tailored for patient-specific studies and utilised as a predictive tool to estimate aneurysm growth and initiation of wall rupture inside the human thoracic aorta.

关键词： aortic dissection biomechanics fluid-structure interaction haemodynamics risk prediction wall shear stress

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A hybrid method of peridynamic differential operator-based Eulerian particle method-immersed boundary method for fluid-structure interaction

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COMPUTATIONAL PARTICLE MECHANICS 2023年第5期10卷 1309-1322页

作者： Chang, Haocheng Chen, Airong Ge, Baixue Tongji Univ Dept Bridge Engn Shanghai 200092 Peoples R China

This paper proposes a non-local Eulerian particle method coupling with immersed boundary method (IBM) for fluid-structure interaction (FSI) problems. In the Eulerian particle method, the partial differential forms of governing equations are transformed into integral forms using peridynamic differential operator (PDDO). Symmetric particle distribution is applied in the Eulerian particle method, enhancing the efficiency and stability of the algorithm. By introducing the IBM framework into the original Eulerian particle method, we can obtain a new coupling method, which could solve problems with moving bodies inside fluid and extend the applicability of the Eulerian particle method. The numerical procedure of the proposed hybrid method is detailed. The proposed method is then applied to three benchmark problems: 2D flow around a steady rectangle/moving square and an impulsively started rigid plate inside a rectangular box filled with water. The results capture the flow characteristics of these problems, showing the proposed method's stability and accuracy.

关键词： Peridynamic differential operator Eulerian particle method fluid-structure interaction Immersed boundary method

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fluid-structure interaction of a thin cylindrical shell filled with a non-Newtonian fluid

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JOURNAL OF fluidS AND structureS 2023年 117卷

作者： Zippo, Antonio Iarriccio, Giovanni Bergamini, Luca Colombini, Elena Veronesi, Paolo Pellicano, Francesco Univ Modena & Reggio Emilia Dept Engn Enzo Ferrari Modena Italy Univ Modena & Reggio Emilia Ctr InterMech MoRe Modena Italy

This paper presents the results of an extensive experimental campaign on the dynamic interactions between an elastic structure and a non-Newtonian fluid. The structure consists of a thin circular cylindrical shell, with the bottom end clamped to a shaking table, and the top end carrying a heavy mass. The fluid is a mixture of water and cornstarch, also known as oobleck. The system dynamics has been analyzed in the presence of different fluid levels (i.e., empty, partially, and full-filled). The experimental modal analysis has been carried out to identify the modal properties of the system. High energy tests have been performed by means of a seismic excitation consisting in a stepped sine sweep, spanning the forcing frequency within the neighborhoods where strong resonance phenomena take place. Different excitation amplitudes have been considered in order to induce phase transitions in the fluid, and the onset of complex dynamics has been detected using Fourier spectra and bifurcation diagrams of the Poincare maps: when the fluid-solid transition occurs, the entangled non-Newtonian fluid rheology results in a complex dynamic scenario where period-doubling cascades, quasiperiodic and chaotic responses can be observed.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Non-Newtonian fluids Nonlinear vibrations Shells Complex dynamics Experiments

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Fast Isogeometric Method for fluid-structure interaction Simulation of Heart Valves with GIFT Framework

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COMMUNICATIONS IN MATHEMATICS AND STATISTICS 2023年 1-25页

作者： Ma, Shuhao Xu, Jinlan Xu, Gang Hangzhou Dianzi Univ HDU ITMO Joint Inst Hangzhou Zhejiang Peoples R China Hangzhou Dianzi Univ Sch Comp Sciece & Technol Hangzhou Zhejiang Peoples R China

In order to improve the efficiency of heart valve simulation, we proposed a fast iso-geometric simulation approach for time-dependent heart valve simulation algorithm with the idea of Geometric-Independent Field approximation (GIFT for short). For the solution of the blood flow field problem in a heart valve, the fluid background mesh is first simplified, then a Bezier tetrahedral mesh is generated based on the simplified mesh to maintain geometric precision, and finally, the fluid velocity field and pressure are solved. In addition, the GIFT idea is used to represent the geometry of computational domain geometry and approximate the physical field solution with different basis function spaces to obtain the numerical solution with the same preci-sion as before simplification. In the structural mechanics simulation of valve leaflets, NURBS surfaces are used to represent the geometric model. To avoid degeneration on geometric boundary, a single leaflet geometric patch is subdivided into four patches. The immersion geometry strategy is adopted in solving the deformation problem of cardiac valve leaflets to achieve high simulation precision, and the dynamic augmented Lagrangian algorithm is used to couple fluid-structure control equations. For the time discretization, the generalized a method is used to control high-frequency dissipation. Numerical examples and comparisons with previous methods are also presented. The proposed algorithm can reduce the computing costs by about 54.3%, which proves the effectiveness of the proposed method.

关键词： Isogeometric analysis fluid-structure interaction Heart valve simulation Bezier tetrahedra

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fluid-structure interaction with a Finite Element-Immersed Boundary approach for compressible flows

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OCEAN ENGINEERING 2023年 290卷

作者： Morales, Freddy Alejandro Portillo Serfaty, Ricardo Vedovotto, Joao Marcelo Cavallini Jr, Aldemir Villar, Millena Martins da Silveira Neto, Aristeu Univ Fed Uberlandia Ave Joao Naves Avila 2121 BR-38108100 Uberlandia MG Brazil Centro Ave Henrique Valadares28 Ctr BR-20231030 Rio De Janeiro RJ Brazil

This paper presents the mathematical modeling and numerical simulations of fluid-structure interaction (FSI) problems. The fluid domain is discretized using a Cartesian block-structured mesh and solved using the Finite Volume Method (FVM), using the LES methodology with Smagorinsky turbulent closure model. The fluid flow in the system is considered compressible, with properties that vary. The Immersed Boundary Method (IBM) is used to model the solid-fluid interface, and the structure deformation was solved using the Finite Element Method (FEM). The Multi-direct Forcing Scheme is used to calculate the fluid-dynamics forces through the IBM. After calculating the fluid forces exerted on the solid, the forces are interpolated and transferred to the FEM model, providing the deformation of the structure at each time step. The structural domain was discretized with Hexahedral eight-noded element with extra shape functions. The simulations were carried out using MFSIm (in-house code), a multiphysics simulation framework developed by the fluid Mechanics Laboratory of the Federal University of Uberlandia with financial support from Petrobras. This paper demonstrates the practical application of FSI analysis in an industrial context, specifically focusing on a pipeline system within a fluid Catalytic Cracking Unit (FCCU) used in the oil and gas industry. The analysis involves the use of butterfly valves positioned at different angles of opening. The results are treated statistically, and a surface response is generated. Machine learning is employed to predict the surface response, showing the valve configurations that yield the maximum and minimum displacement magnitudes of the evaluated structural probes.

关键词： fluid-structure interaction Finite Element Method Finite Volume Method Immersed Boundary Compressible flow

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Simulation of the female pelvic mobility and vesical pressure changes employing fluid-structure interaction method

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INTERNATIONAL UROGYNECOLOGY JOURNAL 2023年第2期34卷 571-580页

作者： Zarrinchang, Pouya Ashrafizaadeh, Mahmud Jamshidi, Nima Isfahan Univ Technol Mech Engn Grp Pardis Coll Esfahan *** Iran Isfahan Univ Technol Dept Mech Engn Esfahan *** Iran Univ Isfahan Dept Biomed Engn Fac Engn Esfahan Iran

Introduction and hypothesis This study aims to develop a fluid-structural interaction (FSI) method to pinpoint the effects of pressure changes inside the bladder and their impact on the supporting structure and the urethra mobility. Methods A physiological model of the nulliparous female pelvis, including the organs, supportive structures, and urine, was developed based on magnetic resonance images. Soft tissues with nonlinear hyperelastic material characteristics were modeled. The Navier-Stokes equations governing the fluid flow within the computational domain (urine) were solved. The urine and soft tissue interactions were simulated by the FSI method. The vesical pressure and its impact on the urethral mobility and supportive structures were investigated during the Valsalva maneuver. Moreover, the simulation results were validated by comparing with a urodynamic test and other research. Results The results demonstrated that the vesical pressure simulated by the FSI method could predict the nonlinear behavior of the urodynamic test pressure. The urethra retropubic bladder neck and the bladder neck-pubic bone angle changed 58.92% and -55.76%, respectively. The retropubic urethral length distance changed by -48.74%. The error compared to the statistical results of other research is < 5%. Conclusions The total deformation and mobility of the urethra predicted by the FSI model were consistent with clinical observations in a subject. The urethra supports dependence on the tissues' mechanical properties, interaction between the tissues, and effect of urine fluid inside the bladder. This simulation effectively depicts the patterns of urethra mobility, which provides a better understanding of the behavior of the pelvic floor.

关键词： Pelvic floor muscle Stress urinary incontinence fluid-structure interaction Vesical pressure simulation

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