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Geometric quality evaluation of three-dimensional printable concrete using computational fluid dynamics

Frontiers of Structural and Civil Engineering 2024年第7期18卷 963-976页

作者： Weijiu CUI Haijun SUN Jiangang ZHOU Sheng WANG Xinyu SHI Yaxin TAO Department of Civil Engineering Qingdao University of TechnologyQingdao 266000China Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao 266000China Intelligent Construction Lab Qingdao University of TechnologyQingdao 266000China Shandong Zhaojin Industrial Development Co. Ltd.Yantai 264000China Architectural Engineering Institute Weifang Engineering Vocational CollegeWeifang 261000China Qingjian Group Co. Ltd.Qingdao 266000China College of Architecture and Urban Planning Qingdao University of TechnologyQingdao 266000China Department of Structural Engineering and Building Materials Ghent UniversityGhent 9000Belgium Institute of Building Materials ETH ZurichZurich 8064Switzerland

The importance of geometrical control of three dimensional(3D)printable concrete without the support of formwork is widely *** this study,a numerical model based on computational fluid dynamics was developed to evaluate the geometrical quality of a 3D printed *** numerical results were compared,using image analysis,with physical cross-sectional sawn *** influence of printing parameters(printing speed,nozzle height,and nozzle diameter)and the rheological behavior of printed materials(yield stress),on the geometrical quality of one printed layer was *** addition,the yield zone of the printed layer was analyzed,giving insights on the critical factors for geometrical control in 3D concrete *** indicated that the developed model can precisely describe the extrusion process,as well as the cross-sectional quality.

关键词： digital fabrication 3D concrete printing geometric quality computational fluid dynamics printing parameters yield stress

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computational fluid dynamics Modeling of Liver Radioembolization: A Review

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CARDIOVASCULAR AND INTERVENTIONAL RADIOLOGY 2022年第1期45卷 12-20页

作者： Aramburu, Jorge Anton, Raul Rodriguez-Fraile, Macarena Sangro, Bruno Bilbao, Jose Ignacio Univ Navarra TECNUN Escuela Ingn Donostia San 20018 Sebastian Spain Inst Invest Sanitaria Navarra IdiSNA Pamplona 31008 Spain Clin Univ Navarra Dept Nucl Med Pamplona 31008 Spain Clin Univ Navarra CIBEREHD Liver Unit Pamplona 31008 Spain Clin Univ Navarra Dept Radiol Pamplona 31008 Spain

Yttrium-90 radioembolization (RE) is a widely used transcatheter intraarterial therapy for patients with unresectable liver cancer. In the last decade, computer simulations of hepatic artery hemodynamics during RE have been performed with the aim of better understanding and improving the therapy. In this review, we introduce the concept of computational fluid dynamics (CFD) modeling with a clinical perspective and we review the CFD models used to study RE from the fluid mechanics point of view. Finally, we show what CFD simulations have taught us about the hemodynamics during RE, the current capabilities of CFD simulations of RE, and we suggest some future perspectives.

关键词： computational fluid dynamics Radioembolization Therapy planning Personalized medicine Liver cancer Dosimetry Hemodynamics

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A computational fluid dynamics Simulation Study on the Variation of Temperature and Pressure in the Container During the Dry Storage Process of Radioactive Metal Oxides

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PROCESSES 2025年第4期13卷 1240-1240页

作者： Chen, Junxiang Zhou, Guanchen Wu, Dehui Zhang, Peng Xie, Fei Liu, Jiapeng Yang, Weimin China Nucl Power Engn Co Ltd Beijing Nucl Chem Res & Design Inst Beijing 100840 Peoples R China China Natl Nucl Corp Nucl Fuel Reproc Engn Technol Res Ctr Beijing 100840 Peoples R China Beijing Univ Chem Technol Coll Mech & Elect Engn Beijing 100029 Peoples R China Harbin Inst Technol State Key Lab Precis Welding &Joining Mat & Struct Harbin 150001 Peoples R China Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China

Radioactive metal oxides are highly radioactive, hygroscopic spent fuel reprocessing products generally stored in container-sealed dry storage. During the storage process of metal oxides, a large amount of heat is generated due to radioactive decay, and helium is produced by alpha-decay, which leads to an increase in the temperature and pressure of the storage container. In order to ensure the safety of the radioactive metal oxides in the long-term storage process, computational fluid dynamics simulations are used to investigate the effects of storage conditions on the temperature and pressure of the container. Based on a large amount of simulated temperature data under different storage conditions, a power function is used to construct a mathematical model of ventilation speed, ventilation temperature, stack density, loading volume, heating power, water content, and cumulative helium mass versus metal oxide temperature to obtain a safe, reliable, and economical storage method. The results show that reducing the loading volume and increasing the density of metal oxides, increasing the ventilation speed, and lowering the ventilation temperature are beneficial to the heat transfer and cooling in the dry storage process;increasing the density of metal oxides and lowering the water content of metal oxides and increasing the ventilation temperature and speed are beneficial to avoid the high pressure inside the container. Based on the optimized storage conditions, the temperature peak in the storage process occurs near 25 years, and its temperature reaches 527.6 K. The mathematical model of storage temperature constructed in this study has high computational accuracy, and the maximum relative error of storage temperature is less than 1.80%.

关键词： radioactive metal oxides dry storage temperature and pressure computational fluid dynamics power function mathematical models

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fluid-structure interaction analysis of pulsatile flow in arterial aneurysms with physics-informed neural networks and computational fluid dynamics

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PHYSICS OF fluidS 2025年第3期37卷

作者： Rehman, M. Abaid Ur Ekici (Ozgeur Ekici), Ozgur Farooq, M. Asif Butt, Khayam Ajao-Olarinoye, Michael Wang, Zhen Liu, Haipeng Natl Univ Sci & Technol NUST Sch Nat Sci SNS Dept Math Sect H 12 Islamabad Pakistan Hacettepe Univ Dept Mech Engn TR-06800 Ankara Turkiye Nordland Hosp Trust Dept Surg Bodo Norway Coventry Univ Computat Sci & Math Modelling Coventry England Westlake Univ Hangzhou Peoples Hosp 1 Sch Med Hangzhou Peoples R China Coventry Univ Ctr Intelligent Healthcare Coventry England

Marfan syndrome (MS) is a genetic disorder often associated with the development of aortic aneurysms, leading to severe vascular complications. The progression of this condition is intricately linked to hemodynamic factors such as wall shear stress (WSS) and von Mises stress, as abnormal distributions can contribute to thrombus formation, endothelial damage, and the worsening of aneurysmal conditions. In this study, six vascular models were analyzed: four representing diseased aortas with Marfan syndrome aneurysms and two healthy aortic models for comparison. The models were sourced from Vascular Model Repository, and computational fluid dynamics (CFD) simulations were conducted using a Newtonian fluid model and the shear stress transport (SST) k- omega turbulent transitional model to evaluate WSS and von Mises stress. fluid-structure interaction was employed to incorporate vessel wall interaction, and pulsatile inlet velocity profiles were used to simulate physiological blood flow, capturing time-dependent hemodynamic variations. The results revealed significant differences between healthy and diseased aortic models. In healthy models, WSS was uniformly distributed, with values consistently below 40 Pa, reflecting stable vascular conditions. Conversely, the diseased models exhibited highly non-uniform WSS distributions, with notably lower values in aneurysmal regions, contributing to thrombus formation, with elevated WSS in areas like the carotid and subclavian arteries due to geometric and hemodynamic complexities. The von Mises stress analysis identified regions of heightened rupture risk, particularly on the superior side of case MS1, where both von Mises stress and WSS reached their highest values among all cases. Physics-informed neural networks demonstrated strong agreement with CFD results while significantly reducing computational cost, highlighting their potential for real-time clinical applications. These findings underscore the critical role of hemodynam

关键词： computational fluid dynamics

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1D Network computational fluid dynamics for evaluating regional pressures in subjects with cement dust exposure

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JOURNAL OF BIOMECHANICS 2025年 180卷 112501-112501页

作者： Tran, Minh Tam Nguyen, Quoc Hung Cui, Xinguang Chae, Kum Ju Kim, Sujeong Yoo, Ji-Seung Choi, Sanghun Kyungpook Natl Univ & IEDT Sch Mech Engn 80 Daehak Ro Daegu 41566 South Korea Huazhong Univ Sci & Technol Sch Aerosp Engn Wuhan Peoples R China Jeonbuk Natl Univ Biomed Res Inst Jeonbuk Natl Univ Hosp Inst Med Sci Dept RadiolRes Inst Clin Med Jeonju South Korea Kyungpook Natl Univ Sch Med Dept Internal Med Div Allergy & Clin Immunol Daegu South Korea Kyungpook Natl Univ Sch Life Sci FOUR KNU Creat BioRes Grp BK21 Daegu 41566 South Korea

Cement dust is a primary contributor to air pollution and is responsible for causing numerous respiratory diseases. The impact of cement dust exposure on the respiratory health of residents is increasing owing to the demand for construction associated with urbanization. Long-term inhalation of cement dust leads to a reduction in lung function, alterations in airway structure, increased inhalation and exhalation resistance, and heightened work of breath. In this study, we investigated the effects of cement dust exposure on lung function based on the pulmonary function test (PFT) and one-dimensional computational fluid dynamics (1D CFD). Statistical tests were performed to address the disparity of airway function between healthy and cement dust-exposed participants. The percent predicted values of forced vital capacity percent (FVC%) and forced expiratory volume in 1 s (FEV1%) were found to be decreased in the group of dust-exposed participants. An elevation of regional pressure variation was found in cement dust-exposed airways during both inhalation and exhalation that was associated with alternations of airway structural features therein. The 1D CFD model is beneficial for a cost-effective estimation of airway regional pressure and provides valuable insights for more precise diagnosis and treatment planning in individuals exposed to cement dust.

关键词： Cement dust Computed tomography computational fluid dynamics Airway Lung

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Mitigating heat stress for agricultural workers using computational fluid dynamics (CFD) simulations

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ENERGY AND BUILDINGS 2025年 328卷

作者： Yi, Yoonhong Akdeniz, Neslihan Choi, Christopher Y. Shutske, John M. Univ Wisconsin Madison Biol Syst Engn Madison WI 53706 USA

The Venlo ventilation system is one of the most widely adopted designs for greenhouses, and it is known for its distinctive roof structure that promotes natural airflow. However, despite its widespread use, it is often inadequate in maintaining the desired temperatures during the summer. This increases the risk of heat stress for greenhouse workers, particularly under the high humidity conditions typically encountered in aquaponic greenhouses. In this study, we developed computational fluid dynamics (CFD) models simulating temperature and air velocity distributions using a commercial-scale Venlo-style aquaponic greenhouse as a reference. The study aimed to evaluate the impact of applying reflective whitewash and installing positive pressure ventilation tubes (PPVT) in worker areas on the heat stress experienced by the workers. The standard k-epsilon turbulence and solar ray tracing models were employed in CFD simulations. A total of 1,776 lettuce at three different growth stages were placed inside the aquaponic pools. The CFD models were validated using an experimental-scale greenhouse, and with these validated models, air velocities at the worker's height were calculated to be 3.1 +/- 0.13 m s-1, 3.2 +/- 0.16 m s-1, and 3.8 +/- 0.04 m s-1 for the control, whitewash, and PPVT + whitewash conditions, respectively. When whitewash and positive pressure ventilation tubes were both in use, the air exchange rate increased from 27.3 to 31.8 per hour. Although there was only a 4.5 increase in air exchanges, strategically placing the ventilation tubes resulted in a 7.3 degrees C decrease in temperature at the average worker height. This reduction shifted the heat index from the "extreme danger" to the "caution" zone, allowing workers to safely work up to four consecutive hours with adequate water intake. The annual cost for running the PPVT inline fans was calculated to be as low as $245, which was 2.6 times less than the previously reported operating costs for greenhouse ve

关键词： Aquaponic greenhouse computational fluid dynamics Heat index Positive pressure ventilation tube Electricity cost

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Hemodynamic analysis of fusiform-shaped inferior vena cava filter with thrombus capture: A computational fluid dynamics study

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PHYSICS OF fluidS 2025年第3期37卷

作者： Wang, Jingying Li, Mingrui Chen, Shuai Lee, Chunhian Shandong Univ Sch Energy & Power Engn Jinan 250061 Peoples R China Jinan Cent Hosp Dept Stomatol Jinan 250013 Peoples R China Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China

The placement of an inferior vena cava filter (IVCF) has been an effective treatment to prevent fatal pulmonary embolism in clinical practice for decades. Fusiform-shaped filter is one of the main types of IVCFs, but its hemodynamics with thrombus capture has not been clearly understood. In this paper, computational fluid dynamics (CFD) simulations are used to investigate the characteristics of blood flow with thrombi over TrapEase and OptEase filters, respectively, two frequently used fusiform-shaped IVCFs in clinic therapy. The blood flow with thrombi is characterized by the Eulerian two-phase flow model, in which the blood is regarded as a non-Newtonian fluid. CFD results show that there are significant stagnation zones downstream of both filters, with the lengths nearly up to 12 times the diameter of the IVC. The no-slip wall conditions of filter wires induce a viscous block effect and result in blood flow acceleration inside the fusiform-shaped filter. The viscous drag contributes predominantly to the total flow resistance of fusiform-shaped filter, about three times the pressure drag. The presence of thrombi does not greatly affect the hemodynamics, but reduces the nearby blood flow speed when captured by the filter. The thrombi primarily accumulate at the end of the filter, increasing both viscous and pressure drag, leading to a 10%-12% increase in total flow resistance. The present study provides common insights into the hemodynamics with thrombus capture of the fusiform-shaped filter, which would contribute to its future clinical use and design improvement.

关键词： computational fluid dynamics

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Evaluating amplified magnetic resonance imaging as an input for computational fluid dynamics models of the cerebrospinal fluid

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INTERFACE FOCUS 2025年第1期15卷 20240039页

作者： Vandenbulcke, Sarah Condron, Paul Dolfen, Henri Safaei, Soroush Holdsworth, Samantha J. Degroote, Joris Segers, Patrick Univ Ghent Fac Engn & Architecture Inst Biomed Engn & Technol IBITECH BioMMedA Ghent Belgium Univ Ghent Fac Engn & Architecture Dept Electromech Syst & Met Engn Ghent Belgium KTH Royal Inst Technol Dept Biomed Engn & Hlth Syst Stockholm Sweden Matai Med Res Inst Tairawhiti Gisborne New Zealand Univ Auckland Fac Med & Hlth Sci Ctr Brain Res Auckland New Zealand Univ Auckland Auckland Bioengn Inst Auckland New Zealand

computational models that accurately capture cerebrospinal fluid (CSF) dynamics are valuable tools to study neurological disorders and optimize clinical treatments. While CSF dynamics interrelate with deformations of the ventricular volumes, these deformations have been simplified and even discarded in computational models because of the lack of detailed measurements. Amplified magnetic resonance imaging (aMRI) enables visualization of these complex deformations, but this technique has not been used for predicting CSF dynamics. To assess the feasibility of using aMRI as an input for computational fluid dynamics (CFD) models of the CSF, we deduced the amplified deformations of the cerebral ventricles from an aMRI dataset and imposed these deformations in our CFD model. Then, we compared the resulting CSF flow rates with those measured in vivo. The aMRI deformations yielded CSF flow following a pulsatile pattern in line with the flow measurements. The CSF flow rates were, however, subject to noise and increased. As a result, scaling of the deformations with a factor 1/8 was necessary to match the measured flow rates. This is the first application of aMRI for modelling CSF flow, and we demonstrate that incorporating non-uniform deformations can contribute to more detailed predictions and advance our understanding of ventricular CSF dynamics.

关键词： amplified magnetic resonance imaging cerebrospinal fluid computational fluid dynamics brain tissue motion phase-contrast magnetic resonance imaging

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Morphology and computational fluid dynamics support a novel classification of Spontaneous isolated superior mesenteric artery dissection

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JOURNAL OF BIOMECHANICS 2025年 182卷 112587-112587页

作者： Xu, Haoyue Yin, Keli Weng, Chengxin Yuan, Ding Zheng, Tinghui Sichuan Univ West China Hosp Dept Gen Surg Div Vasc Surg 37 Guo Xue Xiang Chengdu 610041 Peoples R China Sichuan Univ West China Sch Med Chengdu 610041 Peoples R China Sichuan Univ Coll Architecture & Environm Dept Mech & Engn 24 South Sect 1 Chengdu 610065 Peoples R China Sichuan Univ Yibin Pk Yibin Inst Ind Technol Yibin 644000 Peoples R China Sichuan Univ West China Tianfu Hosp Dept Gen Surg Hepatopancreatobiliary Surg & Vasc S Chengdu 610065 Peoples R China

Flow patterns and classification within Spontaneous Isolated Superior Mesenteric Artery Dissection (SISMAD) are crucial for selecting subsequent treatment options. This study aims to propose a new classification of SISMAD and to propose two corresponding treatment plans based on this new classification. The 3D models of 70 patients with SISMAD were reconstructed and classified into Li types I-V based on morphology, followed by computational fluid dynamics analysis. The results show significant differences in blood flow patterns among patients with the same Li-type SISMAD, suggesting that the same treatment plan should not be applied universally. Based on the different blood flow conditions, a new classification of SISMAD is proposed (HX classification): Type I (dual-lumen flow type), subdivided into Ia and Ib;and Type II (single-lumen flow type). The simulation reveals that the rupture area of Type I SISMAD is related to the pressure difference between its true and false lumens, while the maximum-to-minimum diameter ratio of Type II SISMAD is associated with insufficient true lumen blood supply and lumen dilation. Furthermore, based on patient follow-up data and hemodynamic simulation results, corresponding treatment plans were proposed for the new classification: Type I was judged based on the ratio of rupture area to entrance area as a risk factor, and intervention treatment was recommended if the value was greater than 0.44;Type II can be judged as a risk factor based on the ratio of minimum diameter to maximum diameter, and if the value is less than 0.38, intervention treatment is recommended.

关键词： Spontaneous isolated superior mesenteric artery dissection computational fluid dynamics Blood flow pattern Classification

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Enhancing performance of oblique double layer plate microchannel heat exchanger by computational fluid dynamics: Design and performance optimization

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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2025年 242卷

作者： Kamsuwan, Chaiyanan Wang, Xiaolin Seng, Lee Poh Xian, Cheng Kai Piemjaiswang, Ratchanon Piumsomboon, Pornpote Manatura, Kanit Pratumwal, Yotsakorn Otarawanna, Somboon Chalermsinsuwan, Benjapon Chulalongkorn Univ Fac Sci Fuels Res Ctr Dept Chem Technol Bangkok 10330 Thailand Australian Natl Univ Sch Engn Canberra ACT 2601 Australia Natl Univ Singapore Fac Engn Dept Mech Engn 9 Engn Dr 1 Singapore 117576 Singapore Chulalongkorn Univ Environm Res Inst Bangkok 10330 Thailand Chulalongkorn Univ Ctr Excellence Petrochem & Mat Technol Bangkok 10330 Thailand Kasetsart Univ Fac Engn Kamphaeng Saen Dept Mech Engn Kamphaeng Saen Campus Nakhon Pathom 73140 Thailand Natl Sci & Technol Dev Agcy NSTDA Natl Met & Mat Technol Ctr MTEC Pathum Thani 12120 Thailand

This study aims to improve the performance of oblique microchannel heat exchangers by modifying conventional straight microchannel configurations. A simulation model using computational fluid dynamics (CFD) is developed to evaluate the efficiency of the heat exchanger by analyzing design parameters such as microchannel width, primary to secondary channel width ratio, and number of oblique cuts along the microchannel. Coefficient of performance (COP) a forthright metric for assessing the interaction between operating parameters and achieving optimal performance is proposed. Utilizing a width of 0.48 mm, path ratio of 2.06, and oblique ratio of 1.61, significant improvements in heat transfer and performance efficiency are achieved. The optimized design leads to a substantial reduction in fabrication material, potentially using more than half less material than before. The optimized design of the oblique microchannel heat exchanger strikes a balance between hot flue gas temperature and coolant Reynolds Number (Re) in a waste heat recovery system which considering waste flue gas from the most common boiling process in industry. The results indicate a promising improvement in hydrothermal performance of 8.48% compared to the baseline case of straight microchannel design, resulting in cost savings and enhanced economic sustainability. These findings establish the oblique microchannel heat exchanger as a viable solution for waste heat recovery systems, showcasing its potential for efficient energy reutilization.

关键词： Microchannel Heat exchanger Performance optimization computational fluid dynamics

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