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

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-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 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 in a follow-up study of arterio-venous fistula maturation

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SCIENTIFIC REPORTS 2024年第1期14卷 1-20页

作者： Jodko, Daniel Barber, Tracie Lodz Univ Technol Inst Turbomachinery Wolczanska 217-221 PL-93005 Lodz Poland Univ New South Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

Arteriovenous fistula (AVF) is the preferred vascular access for hemodialysed patients. AVF is created surgically using the patient's artery and vein. Once the connection (anastomosis) is made, the maturation process begins. Studies have shown that most AVFs do not survive beyond one year. This study presents fluid-structure interaction (FSI) modelling of non-Newtonian blood flow through an end-to-side radio-cephalic AVF, investigated weekly during a 15-week follow-up period and 1.5 years postoperatively using ultrasound methods. The aim was to collect qualitative and quantitative data regarding changes in hemodynamics and alterations in the walls of AVF vasculature. Different material properties were assigned to the artery, suture zone (anastomosis), and vein, while the stiffening of the venous arm over time was also modelled. The proposed FSI methodology can be implemented in future follow-up studies involving groups of patients. The main findings revealed: a) counter-rotating vortices in the anastomosis cross-section affecting local pressure conditions;b) different temporal progression of vorticity, shear strain rate, and turbulent kinetic energy and similarity of the temporal progression of WSS obtained under the assumptions of the rigid-walled and FSI;c) a negligible low-WSS zone in the presented thrombosis-free AVF;d) migration of the zone of maximal temporal wall deformation over time.

关键词： Arteriovenous fistula Non-Newtonian blood flow fluid-structure interaction Maturation Remodelling Turbulence kinetic energy

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

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JOURNAL OF fluidS AND structureS 2023年第1期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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Numerical and experimental fluid-structure interaction analysis of a flexible propeller

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SHIP TECHNOLOGY RESEARCH 2023年第3期70卷 163-173页

作者： Fuentes, D. Hochbaum, A. Cura Schulze, R. Tech Univ Berlin Dynam Maritime Syst DMS Dept Muller Breslau Str 15 D-10623 Berlin Germany

The increasing interest in using flexible materials to design marine propellers, considering deformations due to flow loads. A numerical procedure for analysing two-way fluid-structure interactions, based on the commercial STAR-CCM+ multiphysics software, is described and applied to predict the hydroelastic response of the flexible marine propeller P1790 to hydrodynamic forces in open water conditions. The influence of the deformation on the performance of the flexible propeller was analysed by comparison with its rigid counterpart. The procedure has been validated by means of experiments performed in the cavitation tunnel K27 of the Technical University Berlin with both, the flexible and the rigid propeller. The predicted performance coefficients and the axial deformation of the blades agree well with measured values. This suggests the feasibility of using the passive bending and twisting behaviour of a flexible propeller to adapt the pressure distribution on the blade to improve the propeller performance over a range of advance ratios.

关键词： fluid-structure interaction hydroelastic response flexible propellers open water test Reynolds-averaged Navier-Stokes Computational fluid Dynamics Experimental measurements Finite Element Method

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