Article
Engineering, Civil
Guan-Yong Luo, Hong Cao, Hong Pan
Summary: The method proposed in the study provides a simple approach to locate the toe of a hydraulic jump in sloping channels, which has been verified to match well with test data and can even be applied to steep channels up to 45 degrees. The method's application in the analysis of slab stability in a sluice is also briefly discussed, emphasizing the importance of accounting for the static hydraulic jump effect.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Engineering, Chemical
Antai Liu, Changqi Yan, Fuqiang Zhu, Haifeng Gu, Suijun Gong
Summary: The experimental results showed that the liquid film thickness was affected by both gas phase velocity and liquid phase velocity, with the effect of gas phase velocity gradually decreasing as its speed increases in annular flow. The interfacial friction factor was significantly influenced by liquid phase velocity at low gas phase velocity but this impact decreased with increasing gas phase velocity. Existing correlations for the parameters showed a large deviation between predicted and experimental results, leading to the proposal of new correlations for the parameters.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Mechanics
Wilhelm Schneider
Summary: The study investigates the generation of oblique solitary waves by an oblique strip of enlarged bottom roughness, and determines the shape, amplitude, and position of the waves under specific conditions. By introducing assumptions of three-dimensional flow and Froude number, the motion equations are simplified, and it is found that in certain cases the tails of the waves disappear.
Article
Engineering, Civil
Mohammed Amin Hafnaoui, Mahmoud Debabeche
Summary: This study analyzed the displacement of hydraulic jump in a rectangular channel controlled by a sill and obtained a general equation for determining the location of the hydraulic jump.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Mechanics
Hao-Kun Liu, Tian-Liang Yao, Zhe-Hang Shi, Qing-Guo Lin, Wei-Feng Li
Summary: This study experimentally investigated the vertical impact of a rectangular liquid jet using a high-speed camera. The results showed that the shape and size of the liquid film were affected by the jet velocity, aspect ratio, and impact distance.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Engineering, Mechanical
Mahmud R. Amin, Nallamuthu Rajaratnam, David Z. Zhu
Summary: This paper presents an analytical study of the flow and energy loss immediately downstream of rectangular sharp-crested weirs for free and submerged flows. Based on the theory of plane turbulent jets and analysis of relevant studies, the flow regimes downstream are classified into impinging jet and surface flow regimes. A relative energy loss equation is developed for each flow regime, showing that the submerged flow regime has minimal energy loss.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Chemical
Fuqiang Zhu, Changqi Yan, Antai Liu, Haifeng Gu, Suijun Gong
Summary: This paper investigates the droplet size of annular flow in narrow rectangular channels, revealing that the Sauter mean diameter of droplets decreases with increasing gas velocity and increases with liquid velocity. The droplet size distribution shows two types: single-peaked and double-peaked. Additionally, a correlation is proposed to predict the droplets' Sauter mean diameter.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Mechanical
George K. Nikas
Summary: The performance of rectangular-rounded, elastomeric, hydraulic rod seals for reciprocating motion is analyzed in terms of leakage, frictional work, and abrasive wear. Sealing performance maps are constructed based on a newly defined duty parameter, allowing for the selection of optimal values for important parameters. This automated selection process considers friction and abrasive wear while meeting leakage constraints, enabling real-time adjustments for seal edge radius changes.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Nuclear Science & Technology
Jiancheng Zhou, Tianzhou Ye, Dalin Zhang, Gongle Song, Rulei Sun, Jian Deng, Wenxi Tian, G. H. Su, Suizheng Qiu
Summary: Experiments on vertically upward steam-water two-phase flow in a single-side heated narrow rectangular channel with a 3 mm gap were conducted, revealing slug flow at 0.2 MPa and block-bubble flow at 1.0 MPa. The findings are expected to be significant for research on heat transfer, bubble dynamics, and flow instability.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Mahshid Vatani, Davood Domiri Ganji
Summary: This study conducted an experiment to identify the flow pattern and measure the void fraction of gas-liquid two-phase flow in an upward inclined channel. The experiment was carried out in a 30-meter channel with air and water as the fluid mixture. Three flow patterns were observed in the vertical section: slug, churn, or annular-mist flow. It was found that upstream impacts influenced the interactions and momentum transfer between the two phases, while downstream impacts determined the amount of backward flow caused by the formation of counter-current flow.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Marzieh Naem Hasani, Kouros Nekoufar, Morteza Biklarian, Morteza Jamshidi, Quoc Bao Pham, Duong Tran Anh
Summary: This study aimed to investigate the influence of roughness on pressure fluctuations in sudden expanding stilling basins. The results showed that roughness reduces the intensity of pressure fluctuations in sudden expanding stilling basins. Additionally, in the sudden expanding sections, the energy loss increases and the intensity of pressure fluctuations decreases due to the formation of lateral vortices. The maximum values of extreme pressure fluctuations occur in the range 0.609 < X < 3.385, suggesting the importance of reinforcing the bed of stilling basins in this range.
Article
Engineering, Multidisciplinary
M. M. Ibrahim, Mahmoud A. Refaie, Ahmed M. Ibraheem
Summary: This study presents a new technique using bed water jets to dissipate the energy of hydraulic jump in the downstream weirs. Experimental results show that by activating the middle 3 rows of bed water jets, the energy dissipation efficiency of hydraulic jump can be significantly improved, and the jump lengths can be reduced. Stepped back weir is also found to enhance the energy dissipation efficiency and decrease the jump length compared to a 1:2 sloped back weir.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Koji Enoki
Summary: The present study conducted experiments to investigate the two-phase frictional pressure drop characteristics of R410A refrigerant flowing vertically upward and downward for the development of high-performance heat exchangers in air-conditioning systems. The experiments compared the characteristics of measured pressure drops in different inner diameters, cross-section shapes, and flow directions.
APPLIED SCIENCES-BASEL
(2021)
Article
Nuclear Science & Technology
Qingche He, Meiyue Yan, Yang Yu, Liang-ming Pan, Luteng Zhang, Wangtao Xu, Junrui Liu, Chunyu Liu
Summary: The experiment investigated the effect of cross-sectional sizes of rectangular channels on frictional pressure drop in air-water two-phase co-current upward flow. Two models were proposed to predict the frictional pressure drop accurately.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Engineering, Marine
Pieter C. Roos, Giordano Lipari, Chris Pitzalis, Koen R. G. Reef, Gerhardus H. P. Campmans, Suzanne J. M. H. Hulscher
Summary: This study investigates the implications of applying Lorentz's energy criterion to time-varying shallow flows, showing that this method accurately captures both qualitative and quantitative aspects of surge dynamics, specifically in capturing surge peaks, sloshing, and friction-induced tide-surge interactions under various wind forcings, both synthetic and realistic.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Riccardo Alvise Mel, Daniele Pietro Viero, Luca Carniello, Luigi D'Alpaos
Article
Automation & Control Systems
Mirco Rampazzo, Eleonora Manzoni, Michele Lionello, Luigi Di Micco, Francesca Maria Susin
Summary: This paper focuses on the modernization of an existing non-commercial Pulse Duplicator used for testing heart medical devices. The main objective is to fully automate the manual peripheral resistance valve by replacing it with a motorized one, and experimental tests are conducted to assess the effectiveness of the motorized valve.
CONTROL ENGINEERING PRACTICE
(2021)
Article
Marine & Freshwater Biology
Riccardo A. Mel, Daniele P. Viero, Luca Carniello, Andrea Defina, Luigi D'Alpaos
Summary: The closure of the Venice Lagoon in October 2020 for the first time in history due to the Mo.S.E. system's operation not only prevented flooding but also led to unprecedented hydrodynamic scenarios. The closure facilitated a better understanding of wind effects on tide propagation, as well as the evaluation of gate operations' impact on seaward disturbance and infiltration into the lagoon.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Engineering, Biomedical
Giulia Comunale, Francesca M. Susin, Jonathan P. Mynard
Summary: Pregnancy is a unique and dynamic process that involves significant changes in the maternal cardiovascular system to meet increased metabolic demands. Investigating these adaptations is crucial for understanding pregnancy physiology, and this study successfully developed a lumped parameter model to predict cardiac remodeling during pregnancy. The study showed that structural changes in the heart during pregnancy can be accurately predicted using homeostatic principles of myofiber stress and wall shear stress.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Giulia Comunale, Massimo Padalino, Carmelo Maiorana, Giovanni Di Salvo, Francesca M. Susin
Summary: The study aimed to develop a numerical tool that can relate right or left ventricular outflow tract obstruction size with pressure gradient and cardiac output, providing indications of severity and assisting in clinical management for patients. Results from in-silico modeling showed increased pressure gradient and decreased cardiac output, proportional to the severity of the VOT obstruction, supporting clinical data and potentially aiding in diagnosis and surgical treatment planning.
Article
Engineering, Civil
Tommaso Lazzarin, Daniele P. Viero, Daniela Molinari, Francesco Ballio, Andrea Defina
Summary: In this paper, a physics-based method for assessing flood damage is proposed. A non-dimensional impact parameter is introduced to combine water depth and flow velocity, which allows for evaluating relative damage functions for items of different nature. This method provides an understandable assessment of flood hazard even with limited data.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Biomedical
Luigi Di Micco, Benedetta Biffi, Silvia Schievano, Daniela P. Boso, Laura Besola, Alessandro Fiocco, Gino Gerosa, Francesca M. Susin, Andrea Colli, Paolo Peruzzo
Summary: This study evaluates the advantages and disadvantages of the NeoChord-DS1000-System and Harpoon-Mitral-Repair-System for the treatment of degenerative mitral valve regurgitation. Numerical simulation analyses were performed to investigate different transventricular access sites and leaflet insertions. The results provide insights into the technical aspects of transapical off-pump chordal implantation and highlight specific advantages and disadvantages of the two devices. The study lays the foundation for a systematic application of computational methodology to maximize outcomes in patient-specific minimally invasive approaches.
MEDICAL ENGINEERING & PHYSICS
(2022)
Article
Multidisciplinary Sciences
Davide Tognin, Alvise Finotello, Andrea D'Alpaos, Daniele P. Viero, Mattia Pivato, Riccardo A. Mel, Andrea Defina, Enrico Bertuzzo, Marco Marani, Luca Carniello
Summary: Coastal flooding prevention measures, such as storm-surge barriers, are widely adopted globally due to rising sea levels. However, their effects on shallow tidal embayment morphodynamics are poorly understood. Field data and modeling results from the microtidal Venice Lagoon reveal that artificial reduction of water levels leads to increased sediment resuspension and decreased salt marsh accretion.
Article
Water Resources
Tommaso Lazzarin, Daniele P. Viero
Summary: In this study, helical flow secondary currents are included in a two-dimensional depth-averaged hydro-morphodynamic model to analyze the flow field and bed evolution near bends. Different methods are compared in terms of their impact on the flow field and bed evolution using data from laboratory experiments and real-world case studies. The study also discusses key factors in secondary flow modeling, such as implementation tricks and mesh design guidelines.
ADVANCES IN WATER RESOURCES
(2023)
Article
Geosciences, Multidisciplinary
A. Ielpi, D. P. Viero, M. G. A. Lapotre, A. Graham, M. Ghinassi, A. Finotello
Summary: River meandering controls the age of floodplains through the formation of oxbows, while the spacing and timescales of bend evolution and abandonment can be used to constrain the distribution of floodplain ages and sediment-storage time. This approach applies to both natural and simulated rivers, suggesting its potential applicability to unconfined meandering rivers in other locations. However, further testing with independent geo- or dendrochronological data is required.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Tommaso Lazzarin, Daniele P. Viero, Daniela Molinari, Francesco Ballio, Andrea Defina
Summary: Commonly adopted procedures for flood damage assessment have limitations in describing the time evolution of hazard and exposure during the flood event. This study proposes a new framework that considers how flood damage evolves in time, showing potential for flood risk assessment and management.
JOURNAL OF HYDROLOGY
(2022)
Article
Mechanics
Tommaso Lazzarin, Daniele Pietro Viero, Andrea Defina, Luca Cozzolino
Summary: The present paper focuses on two unresolved issues in the free orifice flow under vertical sluice gates: flow stability at large gate openings and the determination of multiple solutions in the case of partial dam-break. Through laboratory experiments and numerical simulations, utilizing a computational fluid dynamics model with the volume of fluid method, these interconnected problems are investigated. A series of quasi-steady states is utilized to determine the threshold of relative gate openings for the transition from orifice flow to non-interacting flow. Furthermore, dam-break experiments with partial gate opening are conducted to establish reliable criteria for disambiguating multiple exact solutions provided by the one-dimensional shallow water theory.
Article
Mechanics
Daniele Pietro Viero, Tommaso Lazzarin, Paolo Peruzzo, Andrea Defina
Summary: The study proposes and discusses a theoretical approach to predict the behavior of open-channel supercritical flow passing over a non-orthogonal step. A sequence of oblique shock waves and expansion fans is generated near and downstream of the step. The proposed model is validated by comparing with a numerical model. Applications include using oblique steps and abrupt wall deflections to control wave fronts in channel bends. Special attention is given to the transition from supercritical to subcritical flow over a forward-facing step, which exhibits complex solutions and hysteresis effects. The theoretical and numerical models determine the existence and hysteresis domains of different flow configurations.
Article
Environmental Sciences
T. Lazzarin, G. Constantinescu, L. Di Micco, H. Wu, F. Lavignani, M. Lo Brutto, D. Termini, D. P. Viero
Summary: The present study investigates the impact of bed roughness on flow and turbulence structure around an isolated, partially-buried mussel. The results show that increasing bed roughness amplifies turbulence kinetic energy in the near-wake region and weakens the strength of the main downwelling flow.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Tommaso Lazzarin, Andrea Defina, Daniele Pietro Viero
Summary: The present work aims to assess the change in flood risk over time due to landscape modifications. The town of San Dona di Piave (Italy) is used as a case study, as it has experienced significant urbanization and anthropization in recent decades, similar to other floodplains in Northern Italy. Flood damage to residential buildings is used as a proxy for flood risk. The analysis is conducted at a local scale, considering changes to individual buildings, and utilizes GIS data such as high-resolution topography, technical maps, and aerial images to track the evolution of the landscape in terms of urbanized areas and hydraulic structures. A physics-based hydrodynamic model is used to determine flood hazard, while an innovative method is employed to estimate the expected flood damage to residential buildings. The findings demonstrate the detrimental effect of urbanization on flood risk, with the risk increasing in proportion to the extent of urbanized areas. The study also highlights the time evolution of flood damage within individual flood events, reflecting changes in the flooding process. Overall, this research offers a promising technique for analyzing the effects of past landscape changes on flood risk, and provides a valuable tool for informed and sustainable land planning.
