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fluid-structure interaction analysis of the return pipeline in the high-pressure and large-flow-rate hydraulic power system

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PROGRESS IN COMPUTATIONAL fluid DYNAMICS 2021年第1期21卷 38-51页

作者： Sang, Yong Liu, Pengkun Wang, Xudong Sun, Weiqi Zhao, Jianlong Dalian Univ Technol Sch Mech Engn Linggong Rd 2 Dalian 116024 Peoples R China

This paper aims to investigate the dynamic characteristic of the return pipeline in the high-pressure and large-flow-rate hydraulic power system. First, the geometry model of the pipeline is established, and a one-way coupling fluid structure method is introduced. The modal analyses with empty and filled pipelines are performed and compared. Then, the pipeline resonance phenomenon is investigated, and the response frequency is achieved by the fast Fourier transformation (FFT) analysis, the results are inconsistent with the experiments. Besides, the dynamic response of the pipeline is simulated. Dynamic mesh and user define function (UDF) are adopted, and the pipeline vibration and water hammer phenomenon are observed. Finally, the dynamic characteristics of the pipeline under different fluid velocities and wall thickness are investigated. The results show that the pipeline valve-induced vibration cannot be lightened by reducing the fluid inlet velocity but can be significantly mitigated by increasing the wall thickness.

关键词： fluid-structure interaction FSI pipeline vibration coupling water hammer sliding valve

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A numerical 3D fluid-structure interaction model for blood flow in a MRI-based atherosclerotic artery

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MATHEMATICAL MODELLING OF NATURAL PHENOMENA 2023年 18卷

作者： El Khatib, Nader Kafi, Oualid Oliveira, Diana Sequeira, Adelia Tiago, Jorge Lebanese Amer Univ Dept CS & Math Byblos Lebanon Univ Lisbon CEMAT Ctr Computat & Stochast Math Lisbon Portugal UCL Dept Mech Engn London England Univ Lisbon Dept Math Inst Super Tecn Lisbon Portugal

Atherosclerosis, as a result of an inflammatory process, is the thickening and loss of elasticity of the walls of arteries that is associated with the formation of atherosclerotic plaques within the arterial intima, which present a double threat. A piece of vulnerable plaque can break off and be carried by the bloodstream until it gets stuck;and plaque that narrows an artery may lead to a thrombus that sticks to the blood vessel's inner wall. The purpose of the present article is to compare effects across different atheromatous plaque material assumptions on hemodynamics and biomechanics within a partly patient-specific computational domain representing an atherosclerotic artery. A full scale 3D ESI numerical model is implemented and different material hyperelastic assumptions are considered for comparison purposes. The 3D realistic geometry is reconstructed from a medical image. This technique may be useful, specially with the recent advances in computer-aided design (CAD), medical imaging, and 3D printing technologies that have provided a rapid and cost efficient method to generate arterial stenotic biomodels, making in vitro studies a valuable and powerful tool. To understand our results, hemodynamic parameters and structural stress analysis were performed. The results are consistent with previous findings.

关键词： Atherosclerosis blood flow fluid-structure interaction MRI imaging

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fluid-structure interaction computational analysis and experiments of tsunami bore forces on coastal bridges

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2021年第5期31卷 1373-1395页

作者： Mazinani, Iman Sarafraz, Mohammad Mohsen Ismail, Zubaidah Hashim, Ahmad Mustafa Safaei, Mohammad Reza Wongwises, Somchai Univ Malaya Dept Civil Engn Kuala Lumpur Malaysia Univ Adelaide Sch Mech Engn Adelaide SA Australia Univ Teknol Petronas Dept Civil & Environm Engn Seri Iskandar Perak Malaysia King Abdulaziz Univ Dept Mech Engn Fac Engn Jeddah Saudi Arabia China Med Univ Dept Med Res China Med Univ Hosp Taichung Taiwan King Mongkuts Univ Technol Thonburi KMUTT Dept Mech Engn Fac Engn Bangkok Thailand Natl Sci & Technol Dev Agcy NSTDA Pathum Thani Thailand

Purpose Two disastrous Tsunamis, one on the west coast of Sumatra Island, Indonesia, in 2004 and another in North East Japan in 2011, had seriously destroyed a large number of bridges. Thus, experimental tests in a wave flume and a fluid structure interaction (FSI) analysis were constructed to gain insight into tsunami bore force on coastal bridges. Design/methodology/approach Various wave heights and shallow water were used in the experiments and computational process. A 1:40 scaled concrete bridge model was placed in mild beach profile similar to a 24 x 1.5 x 2 m wave flume for the experimental investigation. An Arbitrary Lagrange Euler formulation for the propagation of tsunami solitary and bore waves by an FSI package of LS-DYNA on high-performance computing system was used to evaluate the experimental results. Findings The excellent agreement between experiments and computational simulation is shown in results. The results showed that the fully coupled FSI models could capture the tsunami wave force accurately for all ranges of wave heights and shallow depths. The effects of the overturning moment, horizontal, uplift and impact forces on a pier and deck of the bridge were evaluated in this research. Originality/value Photos and videos captured during the Indian Ocean tsunami in 2004 and the 2011 Japan tsunami showed solitary tsunami waves breaking offshore, along with an extremely turbulent tsunami-induced bore propagating toward shore with significantly higher velocity. Consequently, the outcomes of this current experimental and numerical study are highly relevant to the evaluation of tsunami bore forces on the coastal, over sea or river bridges. These experiments assessed tsunami wave forces on deck pier showing the complete response of the coastal bridge over water.

关键词： fluid-structure interaction Tsunami Arbitrary Lagrange Euler Coastal bridge Bore forces

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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-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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Optimizing Sensitivity in a fluid-structure interaction-Based Microfluidic Viscometer: A Multiphysics Simulation Study

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SENSORS 2023年第22期23卷 9265-9265页

作者： Mustafa, Adil Uslu, Merve Ertas Tanyeri, Melikhan Univ Bristol Dept Engn Math Bristol BS8 1TW England Duquesne Univ Sch Sci & Engn Dept Biomed Engn Pittsburgh PA 15282 USA

fluid-structure interactions (FSI) are used in a variety of sensors based on micro- and nanotechnology to detect and measure changes in pressure, flow, and viscosity of fluids. These sensors typically consist of a flexible structure that deforms in response to the fluid flow and generates an electrical, optical, or mechanical signal that can be measured. FSI-based sensors have recently been utilized in applications such as biomedical devices, environmental monitoring, and aerospace engineering, where the accurate measurement of fluid properties is critical to ensure performance and safety. In this work, multiphysics models are employed to identify and study parameters that affect the performance of an FSI-based microfluidic viscometer that measures the viscosity of Newtonian and non-Newtonian fluids using the deflection of flexible micropillars. Specifically, we studied the impact of geometric parameters such as pillar diameter and height, aspect ratio of the pillars, pillar spacing, and the distance between the pillars and the channel walls. Our study provides design guidelines to adjust the sensitivity of the viscometer toward specific applications. Overall, this highly sensitive microfluidic sensor can be integrated into complex systems and provide real-time monitoring of fluid viscosity.

关键词： microfluidic viscometer fluid-structure interaction micropillar deflection multiphysics simulations

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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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