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A hemodynamic model of artery bypass graft considering microcirculation function

BIO-MEDICAL MATERIALS AND ENGINEERING 2024年第3期35卷 237-248页

作者： He, Fan Li, Minru Hua, Lu Guo, Tingting Beijing Univ Civil Engn & Architecture Sch Sci Beijing Peoples R China Chinese Acad Med Sci & Peking Union Med Coll Fuwai Hosp Thrombosis Ctr Natl Ctr Cardiovasc DisState Key Lab Cardiovasc Beijing Peoples R China

BACKGROUND: The incidence of arterial stenosis is increasing year by year. In order to better diagnose and treat arterial stenosis, numerical simulation technology has become a popular method. OBJECTIVE: A novel model is constructed to investigate the influence of microcirculation on the hemodynamics of artery bypass graft. METHODS: In this paper, a severely narrow artery bypass graft model is considered. The geometric shape includes a narrow artery tube and a bypass graft of the same diameter with a 45 degrees suture angle. The fluid-structure interaction model is considered by finite element numerical calculation, and the flow is simulated with microcirculation as the outlet boundary condition. The changes of blood flow velocity, pressure and wall shear stress are analyzed. RESULTS: The results show that blood almost entirely flows into the graft tube and there is no recirculation area at the anastomosis. CONCLUSION: The artery bypass graft model considering microcirculation function could simulate the physiological characteristics of blood flow more reasonably, and it provide helps for clinicians to diagnose and treat arterial stenosis.

关键词： Stenosis microcirculation artery bypass graft hemodynamics fluid-structure interaction

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Embedded finite volume technique for fluid/rigid-body interaction problems

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COMPUTERS & MATHEMATICS WITH APPLICATIONS 2024年 156卷 157-166页

作者： Zamora, Esteban A. Battaglia, Laura Cruchaga, Marcela Storti, Mario UNL CONICET Predio CONICET Santa Fe Dr Alberto Cassano Ctr Invest Metodos Computac CIMEC Colectora Ruta Nac Nro 168Km 0 Paraje El Pozo Santa Fe Argentina Univ Santiago Chile USACH Dept Ingn Mecan Ave Bdo OHiggins 3363 Santiago Chile Univ Tecnol Nacl UTN Fac Reg Santa Fe Grp Invest Metodos Numer Ingn GIMNI Lavaise 610 Santa Fe Argentina

This work describes a formulation for the treatment of submerged rigid solids within the framework of the finite volume method. The proposal consists in considering the solid as a porous region and the hydrodynamic forces that arise from the Darcy terms. The methodology is implemented in an open code that allows largescale calculations. In the present work, we present the methodology and its verification using cases of study, to demonstrate spatio-temporal numerical convergence and the accuracy of the imposition of boundary conditions. For this purpose, cases that have an analytical solution are analyzed, such as the Pouiseuille flow, the first and second Stokes problems, and immersed walls that move with imposed movement generating different pressures between both faces. A moving cylinder analysis is shown to validate the numerical technique in comparison with cases reported in the literature. The analysis leads to stability conditions against external parameters such as permeability. The ability of the method to represent moving walls and immersed bodies with imposed movement is established.

关键词： Finite volume method Embedded domains Penalty-based formulation fluid-structure interaction

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FSI Analysis of a Marine Rudder Behind a Propeller

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INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING 2024年第3期34卷 291-298页

作者： Magionesi, Francesca Dubbioso, Giulio Muscari, Roberto CNR Inst Marine Engn CNR INM Rome Italy

The dynamic response of a marine rudder located in the wake of a propeller is analyzed by the one-way fluid structure interaction (FSI) approach. The time-dependent loads on the rudder are obtained through detached eddy simulation and are used as input for a structural solver to determine the resulting deformations and stresses. The computations consider the propeller at moderate loading and rudder deflection angles at neutral and +/- 4 degrees. The structural response of the rudder is dominated by lateral and torsional deformations, whereas the edgewise deformations are negligible. The lower frequency vibrations are linked to the hydrodynamic interaction with the propeller wake, whereas the higher values are ascribed to the rudder natural mode of vibrations. Moreover, the study includes the identification of the specific contribution of the tip and hub vortex to the rudder deformation.

关键词： fluid-structure interaction detached eddy simulation propeller wake dynamics structural dynamics

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An experimental methodology to study impulsive hydrodynamic loading of air-backed composite plates

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JOURNAL OF SANDWICH structureS & MATERIALS 2024年第2期26卷 244-259页

作者： Zhang, Peng Guo, Yichen Porfiri, Maurizio Tennessee Technol Univ Dept Mech Engn Cookeville TN USA New York Univ Tandon Sch Engn Ctr Urban Sci & Progress Dept Mech & Aerosp Engn Brooklyn NY USA New York Univ Tandon Sch Engn Ctr Urban Sci & Progress Dept Mech & Aerosp Engn Dept Biomed Engn Brooklyn NY USA New York Univ Tandon Sch Engn Room 132613th Floor370 Jay St Brooklyn NY 11201 USA

Sandwich composites in marine vessels are frequently exposed to impulsive hydrodynamic loading during operation in extreme environments. The response of sandwich composites to impulsive hydrodynamic loading has yet to be fully investigated due to the lack of full-field, simultaneous measurement techniques. Here, we propose an experimental framework for the study of the dynamic response of sandwich composites to hydrodynamic loading. We focus on a fiber-reinforced plate positioned at the air-water interface subjected to impulsive hydrodynamic loading. The interaction between the plate and the water is studied through a combined visualization technique based on particle image velocimetry (PIV) and digital image correlation (DIC). The velocity and pressure fields are quantified through PIV, and, simultaneously, the out-of-plane vibration of the plate is inferred from DIC. Repeated measurements were conducted for a range of hydrodynamic loading conditions. Our experiments unveiled a rich multimodal response that is strongly coupled with the flow physics. This work constitutes a first step toward an experimental understanding of fluid-structure interaction of air-backed sandwich composites.

关键词： digital image correlation fluid-structure interaction multimodal vibration particle image velocimetry pressure reconstruction

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Numerical simulation of stress field reorientation in multi-fractures

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GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 2024年第1期10卷 1-26页

作者： Deng, Yan Mu, Shuxing Liu, Yuxuan Mu, Na Guo, Jianchun Zeng, Jie Yu, Hao Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Peoples R China CNPC Chuanqing Drilling Engn Co Ltd Chengdu Peoples R China Univ Western Australia Sch Engn Dept Chem Engn 35 Stirling Highway Perth WA 6009 Australia

Understanding the stress state caused by a subsequent failure is crucial for successful refracturing. However, there are many differences between the stress reorientation phenomena of a multi-fracture horizontal well and that of a single fracture in a vertical well, including the interaction of multi-fractures. These factors can lead to a change in the stress field of multiple fractures, which is more complex than that of a single fracture. In this paper, based on the elastic theory of porous media and the mechanism of fluid-structure interaction, a finite element numerical model of multi-fracture stress fields is established. The net pressure loaded on the fracture wall was corrected using the fracture line model, which was solved using the separated coupling method with a staggered strategy, and a full coupling simulation of fluid flow and rock deformation was achieved. The results showed that with an increase in production time, the stress reorientation area around the fracture and at both ends first increased at a faster rate, then slowly decreased, and finally disappeared,indicating an optimal refracturing time window. This suggests that the greater the number of fractures, the greater the fracture inclination and fracture bending degree, and the more unfavorable it is for the formation and maintenance of the stress reorientation area near the fracture and at both ends of the fracture. The reorientation of the stress field between horizontal wells may lead to the fracture of the infill wells, causing bending and propagation towards the pressure-depletion area, thus reducing productivity. The stress-field reorientation area increased then decreased, indicating an optimal refracturing time *** lower the original principal stress ratio sigma max/sigma min, the larger the maximum stress field reorientation *** maintenance of the stress reorientation area near the fracture is hindered by an increase in the number of fractures,a steeper dip angle, and a h

关键词： Horizontal well Refracturing Stress reorientation fluid-structure interaction Staggered strategy

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Numerical Calibration of the Mooring System for a Semi-Submersible Floating Wind Turbine Model

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JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME 2024年第6期146卷 062001页

作者： Bertozzi, Andrea Niosi, Francesco Jiang, Xiaoli Jiang, Zhiyu Delft Univ Technol Fac Mech Engn Maritime & Transport Technol NL-2628 CD Delft Netherlands Politecn Torino Dept Mech Engn & Aerosp MOREnergy Lab I-10129 Turin Italy Univ Agder Dept Engn Sci N-4898 Grimstad Norway

Numerical modeling of the floating offshore wind turbine (FOWT) dynamics plays a critical role at the design stage of a floating wind project. Still, there exist challenges for verification of efficient engineering models against experimental results. Recently, an experimental campaign was carried out for a 1:96 downscaled model of the OC4-DeepCWind semi-submersible platform with mooring lines made of fiber ropes and chains. Leveraging the results of this campaign, this paper focuses on the development and calibration of a numerical model for the semi-submersible platform with a focus on the dynamic responses under bichromatic waves. In the numerical model, the hydrodynamic loads are modeled based on the potential flow theory with Morison drag. The lumped mass method is applied to model the mooring system. Both free decay tests and bichromatic wave conditions are considered in the model calibration process, and key uncertain parameters (e.g., mooring line length) that affect the response have been identified and discussed. Using the proposed calibration procedure, we establish a reasonably good numerical model for prediction of the platform motion and mooring dynamics. The low-frequency responses of the platform under bichromatic waves are well-captured. These outcomes contribute to the development of efficient numerical FOWT models under experimental uncertainty.

关键词： design of offshore structures floating and moored production systems fluid-structure interaction hydrodynamics ocean energy technology risers mooring dynamics cable dynamics

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A numerical investigation of the effect of vaned diffuser water cooling on the internal flow field of a centrifugal compressor

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 2024年第2期238卷 232-240页

作者： Wang, Yu Chen, Hua Li, Chao Ma, Chao Dalian Maritime Univ Marine Engn Coll Dalian Peoples R China Weifang Univ Sch Machinery & Automat Weifang Peoples R China Dalian Maritime Univ Marine Engn Coll 1 Linghai Rd Dalian 116000 Peoples R China

Due to their high pressure rises, the gas temperature of high-speed centrifugal compressors can be very high to the detriment of compressor aerodynamic performance. A water-cooled vaned diffuser technique is proposed to alleviate this problem. Compressor housing integrated water-cooling passages are employed to introduce cooling water to the vanes through holes near the vane centre. The technique was applied to a 180 mm turbocharger compressor running at the tip speed of 452 m/s, and numerical studies with conjugate heat transfer and fluid-structure thermal interaction were carried out to find the effects of the cooling to compressor performance and the mechanical stress of diffuser vanes. The results show that compressor efficiency is improved by the cooling, and the improvement increases as compressor mass flow reduces. At modest pressure ratios around 3.3, the maximum improvement of 1.09 percentage points is achieved using 30 degrees C inlet water temperature. The cooling is found to significantly reduce the air temperature near diffuser passage solid walls, thus lead to more uniform air temperatures at compressor exit. The reduction of 1.33 degrees C and 2.21 degrees C in the diffuser outlet temperature have been found at 1.68 kg/s air mass flow with 70 degrees C and 30 degrees C water inlet temperature respectively. Moreover, the thermal stress in diffuser vanes is shown to be lower with the cooling.

关键词： Compressor diffuser vanes water cooling conjugate heat transfer fluid-structure interaction internal flow field

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Analysis on refracturing of deep fractured sandstone gas well with set production in Tarim Basin

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PETROLEUM SCIENCE AND TECHNOLOGY 2024年第18期42卷 2467-2493页

作者： Mu, Shuxing Liu, Yuxuan Wen, Zhiming Liu, Hui Guo, Jianchun Yu, Hao Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu Peoples R China PetroChina Tarim Oilfield Co Korla Peoples R China Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Peoples R China

Well workover operation in some blocks of the Tarim Basin resulted in mud leakage to the gas-producing formation, resulting in damage to gas well production. Therefore, refracturing of mud leakage wells in the future is necessary. To explore the means of refracturing to promote the recovery of gas well productivity, studying the evolution law of the production-induced stress field is necessary. Therefore, in this study, a prediction model of the production-induced stress field of fractured high-yield gas wells was established, and the evolution law of the stress field under the set production conditions of high-yield gas wells was clarified. The results show that with an increase in matrix permeability, main fracture conductivity, and natural fracture density, the decrease in the amplitude of stress decreases under the set production. At lower matrix permeability and natural fracture density, the low-stress areas on both sides and the front end of the main fracture are larger. At a higher main fracture conductivity, the low-stress area at both sides and the front end of the main fracture is larger. The change in the in situ stress of the gas well is smaller under set production than constant-pressure production.

关键词： fluid-structure interaction induced stress field mud leakage refracturing Tarim basin

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Segmental biomechanics of the normal and glaucomatous human aqueous outflow pathway

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ACTA BIOMATERIALIA 2024年 173卷 148-166页

作者： Karimi, Alireza Khan, Shanjida Razaghi, Reza Aga, Mini Rahmati, Seyed Mohammadali White, Elizabeth Kelley, Mary J. Jian, Yifan Acott, Ted S. Oregon Hlth & Sci Univ Casey Eye Inst Dept Ophthalmol Portland OR 97239 USA Oregon Hlth & Sci Univ Dept Biomed Engn Portland OR USA Georgia Inst Technol Sch Biol Sci Atlanta GA USA Oregon Hlth & Sci Univ Sch Dent Dept Integrat Biosci Portland OR USA Oregon Hlth & Sci Univ Sch Med Dept Chem Physiol & Biochem Portland OR USA

The conventional aqueous outflow pathway, encompassing the trabecular meshwork (TM), juxtacanalicular connective tissue (JCT), and inner wall endothelium of Schlemm's canal (SC), governs intraocular pressure (IOP) regulation. This study targets the biomechanics of low-flow (LF) and high-flow (HF) regions within the aqueous humor outflow pathway in normal and glaucomatous human donor eyes, using a combined experimental and computational approach. LF and HF TM/JCT/SC complex tissues from nor-mal and glaucomatous eyes underwent uniaxial tensile testing. Dynamic motion of the TM/JCT/SC com-plex was recorded using customized green-light optical coherence tomography during SC pressurization in cannulated anterior segment wedges. A hyperviscoelastic model quantified TM/JCT/SC complex prop-erties. A fluid-structure interaction model simulated tissue-aqueous humor interaction. FluoSpheres were introduced into the pathway via negative pressure in the SC, with their motion tracked using two-photon excitation microscopy. Tensile test results revealed that the elastic moduli of the LF and HF regions in glaucomatous eyes are 3.5-and 1.5-fold stiffer than the normal eyes, respectively. The FE results also showed significantly larger shear moduli in the TM, JCT, and SC of the glaucomatous eyes compared to the normal subjects. The LF regions in normal eyes demonstrated larger elastic moduli compared to the HF regions in glaucomatous eyes. The resultant strain in the outflow tissues and velocity of the aqueous humor in the FSI models were in good agreement with the digital volume correlation and 3D particle image velocimetry data, respectively. This study uncovers stiffer biomechanical responses in glaucomatous eyes, with LF regions stiffer than HF regions in both normal and glaucomatous *** of significanceThis study delves into the biomechanics of the conventional aqueous outflow pathway, a crucial regulator of intraocular pressure and ocular health. By analyzing mechanic

关键词： Glaucoma Trabecular meshwork fluid-structure interaction Biomechanics Segmental regions Aqueous humor outflow

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On the propulsion of a rigid body in a viscous liquid under the action of a time-periodic force

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RESEARCH IN THE MATHEMATICAL SCIENCES 2025年第2期12卷 1-15页

作者： Galdi, Giovanni P. Karakouzian, Mher M. Univ Pittsburgh Swanson Sch Engn Dept Mech & Mat Sci Pittsburgh PA 15260 USA

A rigid body B\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal {B}$$\end{document} moves in an otherwise quiescent viscous liquid filling the whole space outside B\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal B$$\end{document}, under the action of a time-periodic force f\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varvec{\textsf{f}}$$\end{document} of period T applied to a given point of B\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal B$$\end{document} and of fixed direction. We assume that the average of f\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varvec{\textsf{f}}$$\end{document} over an interval of length T does not vanish, and that the amplitude, delta\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\delta $$\end{document}, of f\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{

关键词： Navier-Stokes fluid-structure interaction Vibration-induced motion Time-periodic solutions

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