Article
Acoustics
Iman Zahed, Yasser Amini, Ehsan Izadpanah
Summary: In this study, the effects of flexible plates on the hydrodynamic forces acting on a circular cylinder in turbulent flows were evaluated using the k - omega SST model. The results showed that the flexural rigidity of plates had a significant influence on the hydrodynamic coefficients, increasing the drag coefficient with an increase in non-dimensional flexural rigidity.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Marine
A. Marty, F. Schoefs, G. Damblans, J. -V. Facq, B. Gaurier, G. Germain
Summary: The presence of marine growth increases the diameter and roughness of submarine structures, resulting in increased hydrodynamic loading. Experimental studies on two types of hard roughness (mussels and corals) were conducted and it was found that the hydrodynamic coefficients of the colonized structures were up to 4 times higher than those of a reference cylinder. Standardizing the inertia and drag coefficients using different specific diameters can simplify the estimation of forces applied on the system.
Article
Engineering, Marine
Hanbin Wang, Xueyan Zhang, Xiantao Zhang, Xin Li, Xinliang Tian, Yugao Shen, Wei Song
Summary: A series of physical experiments were conducted to investigate the hydrodynamic interactions between a cylinder and nets on offshore aquacultural platforms. The experiments measured the hydrodynamic characteristics of the cylinder, nets, and combined cylinder-net structures under different conditions. The results showed that the cylinder increased the drag coefficient of net panels with high solidity ratios and inclined nets. The presence of nets also increased the drag coefficient of the cylinder, especially under biofouling conditions. The interaction between the cylinder and nets should be considered in the design of aquacultural structures, particularly for biofouling conditions.
Article
Engineering, Marine
Qiu-Pan Chen, Chun-Wei Bi, Zhi-Xing Zhang, Yun-Peng Zhao
Summary: Biofouling on netting is a significant problem that impacts hydrodynamics and water exchange. Physical model tests were conducted to investigate the drag effect of netting panels with artificial hard and flexible fouling. The results indicated that fouling can rapidly increase netting drag, with severe hard fouling causing a drag amplification factor up to 30 times higher than clean netting. The drag coefficients for artificial hard fouling were found to be up to 54% higher than those for flexible fouling. The proposed formulas for predicting drag coefficients can be used to evaluate cage safety in netting cage design.
Article
Engineering, Marine
Quang Duy Nguyen, Chengwang Lei
Summary: This study investigates the hydrodynamics of a circular cylinder in confined flows, revealing significant increases in drag coefficient and Strouhal number due to confinement. The behavior of the lift coefficient varies in laminar and turbulent flow regimes. Additionally, a reverse Karman vortex street is observed at lower Reynolds numbers with specific arrangements.
Article
Engineering, Aerospace
P. M. Patil, H. F. Shankar
Summary: This study analyzed the flow of hybrid nanofluid around yawed cylinders using viscous dissipation. The results showed that the hybrid nanofluid reduces velocity distribution and increases surface drag coefficient, while having higher fluid temperature and energy transport strength compared to base fluid and nanofluid.
PROPULSION AND POWER RESEARCH
(2022)
Article
Engineering, Marine
Yanjing Gao, Hongwei Liu, Yonggang Lin, Yajing Gu, Yiming Ni
Summary: Rivers in China carry a significant amount of sediment, with much higher concentrations compared to other countries. This study used a CFD-DPM model to investigate the effect of particles on the performance of tidal current turbine blades and found that small diameter particles can improve power while large diameter particles reduce power.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Ocean
Tiao-Jian Xu, Guo-Hai Dong, Ming-Fu Tang, Jun Liu, Wei-Jun Guo
Summary: This study conducted experiments on different types of net panels in extreme waves to analyze the hydrodynamic force, finding that the force heavily depended on the net solidity and KC number, and slightly on the net material. By establishing a wave force model, the study successfully predicted the forces on net panels in extreme waves, demonstrating that the model could simulate the loading process of the submerged net panels effectively.
APPLIED OCEAN RESEARCH
(2021)
Article
Thermodynamics
Rami Homsi, Md Didarul Islam, Yap Yit Fatt, Isam Janajreh
Summary: Numerical study on unheated and heated flows with forced convection over a fixed circular cylinder were conducted, showing that increasing the temperature ratio of the cylinder affects the flow, causing an increase in static load, decrease in dynamic load, and stretching and weakening of vortices in the wake.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Moath Zaareer, Abdel-Hamid Mourad
Summary: This article investigates the effect of side-mirror base position on the aerodynamic forces and acoustics generated along the vehicle body. The results show that base position has little impact on aerodynamic forces, but horizontal base position generates noticeably higher noise than angular placement of the mirror base.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
M. I. Alamayreh, A. Fenocchi, G. Petaccia, S. Sibilla, E. Persi
Summary: The study calculated drag and side force coefficients of a half-submerged cylinder in free-surface flow through numerical simulations, investigating their variability with yaw angle and flow depth versus cylinder diameter ratio. The simulations were validated by comparison with laboratory experiments, and further extended to conditions with significant vertical blockage, revealing detailed flow features near the cylinder for different cases. The results could be applicable beyond log transport, encompassing any scenario of a floating cylinder interacting with free-surface flow.
JOURNAL OF HYDRODYNAMICS
(2021)
Article
Engineering, Civil
Xiaoyu Lei, Linlin Wang, Yun Zhou, Xian-zhong Mao
Summary: A parameterized model was proposed to describe the flow resistance of raft culture, and validated using computational fluid dynamics. The results showed that the model effectively captured the flow impact of aquaculture areas, providing a powerful tool for coastal aquaculture management and evaluation.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Marine
Min-min Zheng, Ya-dong Liu, Yu-ying Tang, You-jiang Wang, Yan-ping He
Summary: This paper presents a numerical simulation study of the hydrodynamic coefficients, surrounding flow and generated internal waves of the NACA0012 hydrofoil in stratified and uniform flows. The results show that the hydrofoil experiences different changes in lift and drag coefficients in a stratified flow environment, and choosing the right variables can improve the lift-to-drag ratio.
Article
Engineering, Civil
Seyed Mehran Ahmadi, Mohammad Taghi Ahmadi
Summary: The flow over an Iranian bridge deck during an extreme flood event caused by climate change was studied using fluid-structure interaction analyses. Hydrodynamic coefficients, velocity vectors, and water surface profiles were determined using the realizable k-epsilon turbulence model and the VOF Method. The study compared the results to advanced design codes and found that the flood loads recommended by the Federal Highway Administration were acceptable, Eurocode-1 predicted them accurately in general, and the Australian Standard overestimated the hydrodynamic loads.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Marine
Henry Francis Annapeh, Victoria Kurushina
Summary: The study investigates the hydrodynamic forces on structures with different cross-sectional shapes in a flow field. The effects of changing cross-sectional shapes on flow profiles are examined through numerical simulations. The results show that the drag on upstream structures increases, while the drag on mid- and downstream structures decreases compared to circular cylinders. Additionally, the third cross-sectional shape exhibits higher drag compared to the others.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Ecology
Andrea Fenocchi, Michela Rogora, Giuseppe Morabito, Aldo Marchetto, Stefano Sibilla, Claudia Dresti
ECOLOGICAL MODELLING
(2019)
Article
Environmental Sciences
Sabrina Meninno, Elisabetta Persi, Gabriella Petaccia, Stefano Sibilla, Aronne Armanini
ENVIRONMENTAL FLUID MECHANICS
(2020)
Article
Environmental Sciences
Diana De Padova, Michele Mossa, Stefano Sibilla
ENVIRONMENTAL FLUID MECHANICS
(2020)
Article
Environmental Sciences
Elisabetta Persi, Gabriella Petaccia, Stefano Sibilla, Ana Lucia, Andrea Andreoli, Francesco Comiti
ENVIRONMENTAL FLUID MECHANICS
(2020)
Article
Environmental Sciences
Diana De Padova, Mouldi Ben Meftah, Francesca De Serio, Michele Mossa, Stefano Sibilla
ENVIRONMENTAL FLUID MECHANICS
(2020)
Article
Engineering, Civil
Diana De Padova, Michele Mossa, Stefano Sibilla
JOURNAL OF HYDRAULIC RESEARCH
(2020)
Article
Engineering, Biomedical
Stefano Sibilla, Sauro Manenti, Tommaso Cazzato, Federica Colombo, Alice A. Tomei, Alberto Redaelli, Vita Manzoli, Filippo Consolo
MEDICAL ENGINEERING & PHYSICS
(2020)
Article
Mechanics
Sara Barile, Diana De Padova, Michele Mossa, Stefano Sibilla
Article
Limnology
Andrea Fenocchi, Michela Rogora, Aldo Marchetto, Stefano Sibilla, Claudia Dresti
JOURNAL OF LIMNOLOGY
(2020)
Article
Environmental Sciences
Sauro Manenti, Andrea Amicarelli, Nunziarita Palazzolo, Massimiliano Bordoni, Enrico Creaco, Claudia Meisina
Review
Limnology
Claudia Dresti, Andrea Fenocchi, Diego Copetti
Summary: This paper reviews modelling studies on medium-to-large deep European perialpine lakes and finds that lakes with larger surface areas receive more scientific attention. There has been exponential growth in the number of papers and their citation count over time, indicating a rising interest in quantitative modelling applications and the increasing availability and ease of use of numerical modelling tools. The use of hydrodynamic models, especially three-dimensional drivers, has increased in recent years, reflecting a growing interest in understanding spatial heterogeneities in the biochemical properties of the lakes.
JOURNAL OF LIMNOLOGY
(2021)
Article
Environmental Sciences
Stefania Avvedimento, Sara Todeschini, Sauro Manenti, Enrico Creaco
Summary: This study provides a numerical comparison of different techniques to ensure sufficient disinfectant residuals in a water distribution network. Operational measures such as booster stations and nodal blowoffs are effective solutions to address the problem of low disinfectant residuals.
Article
Chemistry, Multidisciplinary
Maria Cristina Collivignarelli, Sara Todeschini, Stefano Bellazzi, Marco Carnevale Miino, Francesca Maria Caccamo, Silvia Calatroni, Marco Baldi, Sauro Manenti
Summary: This study investigates the rheological properties of thermophilic biological sludge and evaluates the influence of non-volatile solids. The concentration of sodium bentonite significantly affects the consistency coefficient of the sludge. Thixotropic behavior is more pronounced at higher shear rates and can be represented by a double exponential fitting model.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Claudia Dresti, Michela Rogora, Andrea Fenocchi
Summary: Dissolved oxygen concentration is a key metric for climate-related alterations in deep lakes. This study reveals that climate warming leads to increased water temperatures and thermal stratification, resulting in depletion of deep water dissolved oxygen. Turbulent entrainment plays a crucial role in replenishing dissolved oxygen, greatly exceeding the original input from tributaries.
Article
Engineering, Mechanical
Budi Rochmanto, Hari Setiapraja, Ihwan Haryono, Siti Yubaidah
Summary: This study calibrates a turbine flowmeter for compressed natural gas (CNG) application by using air as a substitute and simulating the kinematic viscosity property of CNG. The research shows that by using air instead of CNG, the flowmeter can achieve accurate measurements with a measurement uncertainty of less than 1%.
FLOW MEASUREMENT AND INSTRUMENTATION
(2024)
Article
Engineering, Mechanical
Mona Mary Varghese, Chaithanya P. Devan, Samiksha M. Masram, Teja Reddy Vakamalla
Summary: This work investigated the influence of particle shape on fluidization behavior at different inlet superficial gas velocities. The experiments were conducted using a laboratory-scale 3D circular fluidized bed column with Geldart D particles of various shapes. The results showed that non-spherical particles had lower minimum fluidization velocities and higher bed expansion compared to spherical particles. Particle shape significantly affected solids holdup, with spherical particles exhibiting higher solids holdup at the same superficial velocity. Frequency domain analysis of pressure signals using Fast Fourier Transform (FFT) and Power Spectral Density (PSD) revealed flow regime transitions associated with changes in particle shape.
FLOW MEASUREMENT AND INSTRUMENTATION
(2024)
Article
Engineering, Mechanical
Ruiming Yu, Yunyan Ma, Kuaile Liu, Xiangyu Liu
Summary: A single-seat control valve with stable flow regulation is researched and designed to address technical problems such as unstable flow at small openings and uneven force on the valve core. The mechanical and flow characteristics, as well as thermal stress, are analyzed through simulations and tests. The results show that the designed valve meets the requirements.
FLOW MEASUREMENT AND INSTRUMENTATION
(2024)
Article
Engineering, Mechanical
Alcemir Costa de Souza, Ewerton Emmanuel da Silva Calixto, Fernando Luiz Pellegrini Pessoa, Valeria L. da Sila, Luiz Octavio Vieira Pereira
Summary: This study proposes a simple CO2 meter for accurately measuring the CO2 content in Brazilian pre-salt production flows. By analyzing the pressure change during a heating assay of an imprisoned sample, the proposed meter is capable of identifying the mixture properties under different CO2 levels.
FLOW MEASUREMENT AND INSTRUMENTATION
(2024)
Article
Engineering, Mechanical
Mehdi Asadi, S. Abbas Hosseini, Kaveh Ahangari
Summary: Due to technical issues with bottom intake racks, porous intakes made of rock, gravel, or sand can be a viable alternative. This study used an experimental model to assess the performance of porous bottom intakes (PBI) and examined the impacts of various parameters such as channel slope, grain size distribution of the porous media, intake structure geometry, and water depth in the channel on diverted flow rates during sediment-free flow. The study also compared the performance of one-sided and three-sided PBI models under the same conditions. The findings suggest that a slope of 1% yields higher discharge coefficient and diverted flow compared to a slope of 1.68%, and three-sided PBI models outperform one-sided models in terms of flow rate. A formula utilizing nonlinear multivariate regression, experimental data, and dimensional analysis was proposed for calculating the discharge coefficient of PBI, with a high accuracy rate of over 95%.
FLOW MEASUREMENT AND INSTRUMENTATION
(2024)