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fluid-structure interaction model of blood flow in abdominal aortic aneurysms with thermic treatment

ALEXANDRIA ENGINEERING JOURNAL 2023年 64卷 81-95页

作者： Alsabery, Ammar I. Ismael, Muneer A. Al-Hadraawy, Saleem K. Ghalambaz, Mohammad Hashim, Ishak Chamkha, Ali J. Islamic Univ Coll Tech Engn Refrigerat & Air conditioning Tech Engn Dept Najaf Iraq Univ Basrah Engn Coll Mech Engn Dept Basrah Iraq Univ Kufa Coll Sci Dept Biol Najaf Iraq Tomsk State Univ Lab Convect Heat & Mass Transfer Tomsk 634045 Russia Univ Kebangsaan Malaysia Fac Sci & Technol Dept Math Sci Ukm Bangi 43600 Selangor Malaysia Kuwait Coll Sci & Technol Fac Engn Doha Dist 35004 Kuwait

Hyperthermia is one of the non-invasive therapy of an Abdominal Aortic Aneurysm (AAA), which is achieved by applying a heat source upon the AAA without surgical operation. This research paper considers laminar flow and heat transfer in a heated abdominal aortic aneurysm using an isothermal boundary condition. Heat is added to explicate the thermal treatment of a dis-eased artery. The blood is assumed as a non-Newtonian fluid based on the shear-thinning Carreau model. Two unequal aneurysms are assumed in the lower wall to simulate bulges or a disordered artery. Flexible wall segments are assumed in the upper wall and opposing to each aneurysm. The transient momentum and energy equations are solved based on the fluid-structure interaction (FSI) using the Arbitrary-Lagrangian-Eulerian (ALE) method. It is found that the shear stress is much higher for a higher index of the power-law fluid governing the blood viscosity and hence, it is strictly recommended to reduce the viscous nature of the blood in diseased vessels. It is found also that the thermal energy can be greatly transported across the blood at a higher Reynolds num-ber, this means that the hyperthermia therapy becomes effective when blood flows violently through the aortic.(c) 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Forced convection Heat transfer Carreau non-Newtonian model Blood flow fluid-structure interaction Abdominal aortic aneurysms

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fluid-structure interaction Characterization in Serpentine Exhaust Nozzles

Fluid-Structure Interaction Characterization in Serpentine E...

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Asia-Pacific International Symposium on Aerospace Technology (APISAT)

作者： Zheng, Haibo Huang, Jiangtao He, Chengjun Gao, Chao Chen, Xian Northwestern Polytech Univ Xian 710072 Peoples R China China Aerodynam Res & Dev Ctr Mianyang 621000 Peoples R China

ISBN: (纸本)9789819740123;9789819740109;9789819740093

In order to explore the fluid-structure interaction (FSI) characteristics of serpentine nozzle, a numerical simulation framework of FSI for serpentine nozzle was constructed, and the changes of flow field characteristics and structural deformation in the nozzle under different pressure ratio states were studied. It is found that the complex geometry of the serpentine nozzle leads to the uneven distribution of internal flow parameters, and the structural deformation of the nozzle affects the internal aerodynamic load distribution of the nozzle. Under the action of the aerodynamic load of drastic changes in non-uniform flow, the nozzle is deformed, and the main deformation form is bulging from the inside to the outside, which further leads to the weakening of the expansion degree of flow in the nozzle and the increase of pressure. With the gradual increase of the inlet pressure ratio, the maximum deformation also increases, and the maximum deformation is about 2.9 mm, reaching 5% of the outlet height of the nozzle.

关键词： Serpentine Nozzle fluid-structure interaction Nozzle Pressure Ratio Aerodynamic Load

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fluid-structure interaction and experimental studies of passive check valve based piezoelectric micropump for biomedical applications

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ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES 2024年第3期10卷 2095-2121页

作者： Vante, Abhijeet B. B. Kanish, T. C. Vellore Inst Technol VIT Sch Mech Engn Vellore India

The piezoelectric micropump can be a prominent component of drug delivery systems due to its high performance, low cost, and faster response. However, backpressure remains to be the most common problem in micropump technology. Thus, microvalves or the passive check valve based piezoelectric micropump can be used to prevent the backpressure. However, the complex structure of the passive check valve based micropump limits the investigations of fluid-structure interaction (FSI) due to the intricate Multiphysics involved. This paper presents the investigations on the flow behaviour and performance of a passive check valve based piezoelectric micropump using numerical analysis. The simulation study comprising FSI depicts the performance of a piezoelectric micropump using a fluid-structure coupling, fluid selection, structural modelling, and piezoelectric equations. The simulation results illustrate the micropump performance characteristics such as piezoelectric actuator displacement, micropump flow rate, backpressure, and Von Mises stress. Experiments are conducted to validate simulation results by studying the effect of voltage and frequency on the micropump flow and pressure characteristics. The experimental study demonstrated that the passive check valve based piezoelectric micropump delivers a maximum flow rate of 32 ml/min at zero backpressure. The micropump can pump the fluid against maximum backpressure up to 35 kPa.

关键词： Micropump drug delivery piezoelectric fluid-structure interaction Multiphysics

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fluid-structure interaction ANALYSIS OF CRESCENT-SHAPED WINGSAILS 43

FLUID-STRUCTURE INTERACTION ANALYSIS OF CRESCENT-SHAPED WING...

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ASME 43rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Zhu, Heng Chernoray, Valery Ringsberg, Jonas W. Yao, Hua-Dong Ramne, Bengt Chalmers Univ Technol Dept Mech & Maritime Sci Gothenburg Sweden ScandiNAOS AB Gothenburg Sweden

ISBN: (纸本)9780791887844

The use of wind-assisted ship propulsion is regarded as one of the effective ways to reduce greenhouse gas emissions. This study combines wind tunnel experiments and advanced numerical simulations to investigate the model-scale effects and fluid-structure interaction (FSI) of a wingsail with a crescent-shaped profile. First, a wind tunnel test is carried out to study the aerodynamic loads and flutter of the wingsail. Next, a numerical method for analyzing FSI, fully coupling computational fluid dynamics and finite element analysis, is established. By comparing the experimental and numerical results, the model-scale effect that has an influence on the accuracy of prediction, e.g., laminar-turbulent transition, is discussed. Then, a full-scale FSI simulation based on a simplified solid model was performed to study the flutter and its influence on the propulsive performance. The results indicate that the crescent-shaped profile causes notable periodic oscillations due to strong flow separation, significantly affecting propulsive performance. These insights are crucial for the design and optimization of wingsail structures in enhancing windassisted ship propulsion.

关键词： fluid-structure interaction wind-assisted ship propulsion wingsail wind tunnel test

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fluid-structure interaction Analysis of a Fabric Skin for Fabric-Covered Wind Turbine Blades

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INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES 2022年第1期23卷 92-101页

作者： Choi, Dong-Kuk An, Hyung-Ju Lee, Soo-Yong Bae, Jae-Sung Korea Aerosp Univ Sch Aerosp & Mech Engn 76 Hanggongdaehak Ro Goyang Si 10540 Gyeonggi Do South Korea

Wind turbines are becoming larger to produce more power from the wind in a given area. While the large-size wind turbines are advantageous in terms of generating power, the blades are very heavy and difficult to transport and install. General Electric Co. and the National Renewable Energy Laboratory proposed a new blade design and manufacturing concept that covers the blade with tensioned fabrics. This fabric-covered wind turbine blade is composed of spar-rib structures and covering fabric skins. The present study investigates the aerodynamic effects of fabric skin. A fluid-structure interaction (FSI) analysis was performed about the fabric skin of a large-sized fabric-covered blade. Through static and dynamic FSI analyses, the response of the fabric skin was analyzed according to the wind speeds. The natural frequencies and mode shapes were compared. It was confirmed that the tension of the fabric skin should be increased as much as possible to maintain aerodynamic efficiency, and in addition that the natural frequencies and mode shapes were changed by the wind speeds.

关键词： Wind turbine Blade Fabric-covered blade Membrane structure Fabric skin fluid-structure interaction

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fluid-structure interaction Model for Predicting Surgical Result of Total Anomalous Pulmonary Venous Connection and Estimating Pulmonary Venous Properties

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CARDIOVASCULAR ENGINEERING AND TECHNOLOGY 2022年第5期13卷 725-734页

作者： Jin, Jie Ma, Xiaohui Fu, Xingpeng Zhang, Zewei Yu, Jiangen Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept Cardiac SurgSch Med Hangzhou Peoples R China Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept RadiolSch Med Hangzhou Peoples R China Zhejiang Univ Childrens Hosp Natl Clin Res Ctr Child Hlth Dept UltrasonogSch Med Hangzhou Peoples R China

Objectives To build a fluid-structure interaction model of pulmonary veins with total anomalous pulmonary venous connection, which can be used to predict the result of surgical treatment and at the same time to estimate the elastic properties of pulmonary veins based on patient-specific data and clinic postoperative results. Methods The fluid-structure interaction (FSI) model was used to simulate the anastomosis on pulmonary veins based on computed tomography angiography data collected from three children with total anomalous pulmonary venous connection (TAPVC), supra-cardiac type. The deformation and the stress of anastomosis, and also the velocity of blood flow were calculated in fluid-structure coupling algorithm. During the simulation the variable boundary conditions were applied, including the thickness of vessel wall and the vessel elasticity for which was selected a range of values. The calculation results were finally compared to postoperative results of same patients and discussed. The corresponding outcomes are given in the conclusions section. Results The blood flow velocity through the outlet will vary depending on the properties of vessels, including physical properties and thickness of vessel wall. The stress on vessel is lower for smaller values of Young's modulus. The calculated blood flow velocity correlates well with the postoperative results for the Young's modulus of vessels ranging from 0.5 to 1.0 MPa. Conclusions The FSI model has high potential to predict the result of surgery for TAPVC and to estimate the physical properties of pulmonary vein. This model also has potential to guide the strategy for surgical treatment.

关键词： fluid-structure interaction TAPVC Pulmonary vein Anastomosis Young's modulus

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fluid-structure interaction analysis of heat exchanger with torsional flow in the shell side

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2022年第1期36卷 479-489页

作者： Gu, Xin Wang, Guan Zhang, Qianxin Chen, Cheng Li, Ning Chen, Weijie Zhengzhou Univ Key Lab Proc Heat Transfer & Energy Saving Henan Zhengzhou 450002 Peoples R China

Based on the theory of fluid-structure interaction (FSI), the flow characteristics and mechanical properties of torsional flow heat exchanger (TFHX) and cross torsional flow heat exchanger (CTFHX) were numerically studied. The simulation results were compared with the experimental results to verify the reliability of the numerical simulation. The results show that the pressure drop of CTFHX decrease is 30.31-32.56 % lower than that of TFHX, and the heat transfer coefficient is found to lower by 16.8-18.5 %, but the comprehensive performance h/Delta P is increased by 14.8-17.9 %. There is also a higher stress around the baffle holes, and the influence of temperature load on stress is much greater than that of pressure load. Moreover, the linearization results of hazardous locations show that CTFHX has greater stress. This study provides theoretical guidance for the structural optimization and equipment maintenance of heat exchanger.

关键词： fluid-structure interaction Stress analysis Thermal hydraulic performance Torsional flow

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fluid-structure interaction simulation of calcified aortic valve stenosis

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MATHEMATICAL BIOSCIENCES AND ENGINEERING 2022年第12期19卷 13172-13192页

作者： Cai, Li Hao, Yu Ma, Pengfei Zhu, Guangyu Luo, Xiaoyu Gao, Hao Northwestern Polytech Univ Sch Math & Stat Xian 710129 Peoples R China NPU UoG Int Cooperat Lab Computat & Applicat Card Xian 710129 Peoples R China Xian Key Lab Sci Computat & Appl Stat Xian 710129 Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Peoples R China Univ Glasgow Sch Math & Stat Glasgow G12 8QQ Lanark Scotland

Calcified aortic valve stenosis (CAVS) is caused by calcium buildup and tissue thickening that impede the blood flow from left ventricle (IN) to aorta. In recent years, CAVS has become one of the most common cardiovascular diseases. Therefore, it is necessary to study the mechanics of aortic valve (AV) caused by calcification. In this paper, based on a previous idealized AV model, the hybrid immersed boundary/finite element method (IB/FE) is used to study AV dynamics and hemodynamic performance under normal and calcified conditions. The computational CAVS model is realized by dividing the AV leaflets into a calcified region and a healthy region, and each is described by a specific constitutive equation. Our results show that calcification can significantly affect 1W dynamics. For example, the elasticity and mobility of the leaflets decrease due to calcification, leading to a smaller opening area with a high forward jet flow across the valve. The calcified valve also experiences an increase in local stress and strain. The increased loading due to AV stenosis further leads to a significant increase in left ventricular energy loss and transvalvular pressure gradients. The model predicted hemodynamic parameters are in general consistent with the risk classification of AV stenosis in the clinic. Therefore, mathematical models of AV with calcification have the potential to deepen our understanding of AV stenosis-induced ventricular dysfunction and facilitate the development of computational engineering-assisted medical diagnosis in AV related diseases.

关键词： fluid-structure interaction aortic valve calcification hybrid immersed boundary/finite element method

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fluid-structure interaction modeling with nonmatching interface discretizations for compressible flow problems: Computational framework and validation study

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MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES 2022年第12期32卷 2497-2528页

作者： Rajanna, Manoj R. Johnson, Emily L. Liu, Ning Korobenko, Artem Bazilevs, Yuri Hsu, Ming-Chen Iowa State Univ Dept Mech Engn Ames IA 50011 USA Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA Global Engn & Mat Inc Princeton NJ 08540 USA Univ Calgary Dept Mech & Mfg Engn Calgary AB T2N 1N4 Canada Brown Univ Sch Engn Providence RI 02912 USA Iowa State Univ Dept Mech Engn Ames IA 50011 USA

This work presents a strongly-coupled fluid-structure interaction (FSI) formulation for compressible flows that is developed based on an augmented Lagrangian approach. The method is suitable for handling problems that involve nonmatching fluid-structure interface discretizations. In this work, the fluid is modeled using a stabilized finite element method for the Navier-Stokes equations of compressible flows and is coupled to the structure, which is formulated using isogeometric Kirchhoff-Love shells. The strongly-coupled system is solved using a block-iterative approach. The proposed method is validated using two compressible flow benchmark problems to assess the accuracy of the developed formulation.

关键词： Compressible flow fluid-structure interaction nonmatching interface isogeometric analysis Kirchhoff-Love shell

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fluid-structure interaction analysis of flexible flapping wing in the Martian environment

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ACTA ASTRONAUTICA 2022年 193卷 138-151页

作者： Kawakami, Kosuke Kaneko, Shigeki Hong, Giwon Miyamoto, Hideaki Yoshimura, Shinobu Univ Tokyo Sch Engn Dept Syst Innovat Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan Japan Aerosp Explorat Agcy 2-1-1 Sengen Tsukuba Ibaraki 3058505 Japan

Flapping-wing micro air vehicle (FWMAV) is an attractive idea for Mars exploration because of its high capability in a thin atmosphere. The biggest challenge for its development is an appropriate understanding of a flapping flight with flexible wings, which is significantly complicated because flexible flapping wings can undergo large-scale deformations due to the effects of wing inertia and the aerodynamic forces exerted by the surrounding atmosphere. fluid-structure interaction (FSI) analysis is a powerful tool for accurate investigations, but it usually has a very high computational cost, making it challenging to perform necessary parametric studies for practical designing. An efficient FSI analysis method is required. On Mars, whose atmospheric density is around 1% that of Earth, aerodynamic forces have a relatively small influence on wing deformation and may even be negligible in some cases. We thus investigate the relative contributions of the inertial force of a flapping wing and the aerodynamic forces exerted by the surrounding Martian atmosphere using a two-way coupled FSI simulation, and identify the conditions under which the aerodynamic forces are negligible. Then, we develop a computationally efficient one-way coupled FSI analysis system based on the interface-capturing method to design a flexible flapping wing for Mars exploration. Under the obtained conditions, we perform parametric studies on hovering flight with flexible flapping wings in the Martian environment with multiple aerodynamic parameters, various kinematic parameters, and material properties of the wing. We conclude that an FWMAV with a payload of around 5 g can fly for more than 1 min for the maximum density of the Martian atmosphere.

关键词： Flapping wing fluid-structure interaction Two-way coupling One-way coupling Mars

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