Article
Environmental Sciences
Behzad Shakouri, Imren Ismail, Mir Jafar Sadegh Safari
Summary: In this study, a new method for determining the flow discharge of vertical sluice gates is proposed using energy-momentum equations to characterize the physical expression of the phenomena. The coefficient of discharge, contraction coefficient, and energy loss coefficient are calculated using an optimization approach. Regression equations for quantifying the energy loss coefficient are produced using symbolic regression method. The derived formulas are used to compute the discharge coefficient and flow discharge of the vertical sluice gate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Mechanical
Babak Vaheddoost, Mir Jafar Sadegh Safari, Rasoul Ilkhanipour Zeynali
Summary: A novel method is proposed for determining flow discharge in vertical sluice gates with small bias, which involves deriving equations for discharge coefficient, optimizing contraction and energy loss coefficients, and validating the performance against selected benchmarks. The study shows a meaningful power relationship between contraction and energy loss coefficients.
FLOW MEASUREMENT AND INSTRUMENTATION
(2021)
Article
Engineering, Civil
Farzin Salmasi, John Abraham
Summary: This study investigates the effect of different sill shapes on the discharge coefficient C-d under a vertical sluice gate. Results show that circular sills can increase C-d, with the highest values observed in a 3 cm diameter circular sill. Sill height and shape significantly impact C-d, while the most influential parameters are H-1/p and Z/G.
JOURNAL OF HYDROLOGY
(2021)
Article
Energy & Fuels
Christian Grinderslev, Sergio Gonzalez Horcas, Niels Normark Sorensen
Summary: The study conducted high fidelity fluid-structure interaction (FSI) simulations to investigate the aeroelastic behaviors of a 2.3 MW wind turbine rotor in different complex atmospheric flows. The results show good agreement between FSI simulations and measured forces, with FSI simulations predicting similar forces as computational fluid dynamics (CFD)-based FSI but with distinct discrepancies from blade element momentum (BEM) theory based simulations. The study suggests the need for validation of BEM-based simulations through higher fidelity methods, especially when considering complex flows.
Article
Engineering, Environmental
Olav R. Hansen, Eirik S. Hansen
Summary: This article describes the large-scale LH2 release tests commissioned by the Norwegian Public Roads Administration to study the dispersion and explosion properties of liquid hydrogen (LH2) both indoor and outdoor. The study aims to better understand the experiments and demonstrate that LH2 safety assessments can be accurately simulated and predicted.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Jianwei Zhang, Bingpeng Wang, Qi Jiang, Ge Hou, Zhirui Li, Hongze Liu
Summary: This paper investigates the fluid-solid interaction problem involving structural movement and deformation. It proposes an SPH interaction method to establish a numerical fluid-solid model. The method demonstrates good accuracy by comparing with experimental results.
Article
Engineering, Civil
Chuanming Sheng, Fang Liu, Chao Ma, Jijian Lian, Bin Ma
Summary: In this study, the problem of sluice gate jamming in moving water was investigated using computational fluid dynamics and model tests. The results identified the main reason for non-closure of the sluice gate as high friction coefficient due to prolonged submersion in water. Feasible ways to promote gate closure in an emergency and achieve complete closure in the modification stage were also suggested.
JOURNAL OF HYDRAULIC RESEARCH
(2023)
Article
Engineering, Chemical
Wenjie Ding, Xiaolong Fu, Chao Chen, Junyan Wang, Jingwei Hou, Chengjian Xiao, Hongwen Huang, Heyi Wang
Summary: In this study, tritiated water distillation experiments with metal-organic frameworks (MOFs)-modified superspreading interface and computational fluid dynamic (CFD) simulations were conducted. It was found that reducing the contact angle can increase the gas-liquid interface area and improve the separation performance of the distillation column. This research increased the understanding of the influence of surface wetting on the performance of tritiated water distillation and had potential applications for other gas-liquid two-phase flow separation processes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Zhi-xin Gao, Yang Yue, Jia-ming Yang, Jun-ye Li, Hui Wu, Zhi-jiang Jin
Summary: In this study, the original V-ball valve was improved and compared with the improved V-ball valve in terms of flow characteristics. It was found that within the gap, the flow coefficient increases and the loss coefficient decreases as the valve opening increases, with a linear relationship between the flow coefficient and the flow cross-area of the added gap. Additionally, under the same flow cross-area, a greater distance between the gap and the ball center or an approximately rectangular port results in a higher flow coefficient, while the loss coefficient has an opposite trend.
Article
Engineering, Environmental
Shanwei Hu, Xinhua Liu
Summary: The EMMS sub-grid model was simplified by replacing the stability condition with an equivalent cluster voidage correlation, ensuring Galilean invariance and avoiding the recalculation of Hd in case of varying operating conditions. The pre-constructed drag correction factor facilitates the coarse-grid CFD simulation of gas-solid fast fluidization within a broad operation range.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Katarzyna Sindera, Marzena Iwaniszyn, Przemyslaw J. Jodlowski
Summary: Short-channel structures are promising catalyst carriers due to the ease of controlling heat/mass transfer and fluid flow characteristics. Experimental and numerical investigations were conducted to understand the flow resistance of hexagonal structures, showing some discrepancies between theoretical approaches and practical results. Additionally, a comparison between short structures and widely used long monoliths was performed to analyze the differences in channel length.
Article
Engineering, Marine
Songgui Chen, Jingru Xing, Liang Yang, Huaqing Zhang, Yingni Luan, Hanbao Chen, Haiyuan Liu
Summary: Computational Fluid Dynamics (CFD) is utilized to study the interaction between waves and breakwaters, where a new type of flap-gate breakwater's performance is validated and computational costs are reduced.
Article
Chemistry, Physical
I. C. Tolias, A. G. Venetsanos, M. Kuznetsov, S. Koutsoukos
Summary: In this study, a newly developed CFD deflagration model integrated into the ADREA-HF code was evaluated against hydrogen vented deflagration experiments in different scale enclosures. The model showed good performance for back-wall ignition cases, but overestimated the maximum overpressure for center ignition cases, possibly due to the opening of the vent cover. Turbulence was identified as the main factor enhancing external explosion strength leading to sudden pressure increases.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Du Qiang, Xie Lei, Liu Guang, Lian Zengyan, Liu Jun
Summary: This study investigates the influence of pumping effect on the flow characteristics of axial rotating holes, concluding that the radial outflow induced by the pumping effect can cause the theoretical two-dimensional incidence angle to become three-dimensional, negatively affecting the discharge coefficient of the holes. Additionally, square holes, due to their larger circumferential length, mitigate the pumping effect and have a higher discharge coefficient compared to round holes.
Article
Engineering, Mechanical
Victor Roda-Casanova, Francisco Sanchez-Marin, Raul Martinez-Cuenca
Summary: Heat convection is a significant factor in the cooling process of polymer spur gears running in dry conditions, affecting the gear strength. A numerical heat convection model is proposed in this study, based on a detailed CFD simulation, to investigate heat convection on the external surfaces of the gears. Parametric studies reveal that the relative differences between the results obtained from this model and a representative classical heat convection model can reach up to 125% in terms of heat transfer coefficients. An optimized heat convection model, using empirical equations derived from Newton's law of cooling, is proposed to improve the accuracy of the classical models while reducing the maximum relative differences to 10%.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Environmental Sciences
Ludovic Cassan, Helene Roux, Denis Dartus
ENVIRONMENTAL FLUID MECHANICS
(2020)
Article
Agricultural Engineering
Firouz Ghasemzadeh, Salah Kouchakzadeh, Gilles Belaud
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
(2020)
Article
Ecology
Gabrielle Rudi, Gilles Belaud, Sebastien Troiano, Jean-Stephane Bailly, Fabrice Vinatier
Summary: The research on hydrochorous dispersal through agricultural channels shows that vegetation cover at the water surface is a key factor in explaining floating seed retention in open channels. The experiment results indicate that different species react differently to changes in seed density, and that vegetation cover at the free water surface is a generic predictor of floating seed retention. Additionally, a semi-empirical formula has been developed to predict seed retention, which can be used by stakeholders to estimate vegetation needed to limit or enhance seed dispersal in channels.
Article
Agricultural Engineering
Leo Guiot, Ludovic Cassan, Gilles Belaud
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
(2020)
Editorial Material
Agricultural Engineering
Firouz Ghasemzadeh, Salah Kouchakzadeh, Gilles Belaud
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
(2021)
Article
Environmental Sciences
Flavia Cavalcanti Miranda, Ludovic Cassan, Pascale Laurens, Tien Dung Tran
Summary: This study experimentally and numerically investigated a rock-ramp fish passage with square obstacles, revealing that the square blocks have better passability but also result in higher water depth. The shape of the obstacles is an important modifiable parameter to be considered in the design process.
Article
Green & Sustainable Science & Technology
Ludovic Cassan, Guilhem Dellinger, Pascal Maussion, Nicolas Dellinger
Summary: The Hydrostatic Pressure Wheel is an innovative solution for regulating flow discharges and water levels in open channel networks. It can maintain water depth, supply energy, and has been experimentally proven to be feasible and sustainable.
Article
Engineering, Civil
Christina Orieschnig, Jean-Philippe Venot, Sylvain Massuel, Khy Eam Eang, Kong Chhuon, Sambo Lun, Sokly Siev, Gilles Belaud
Summary: The livelihoods of the rural population in the Cambodian Mekong delta are influenced by annual floods, but the dynamics of floodplains are changing due to climate change and hydropower development. While previous studies have assessed the changes in river discharge and flood extent on a larger scale, this study focuses on the local and specific scales, using a methodology to track the evolution of hydrological regimes and inundations. The results show changes in the incidence, duration, and spatial distribution of floods, with a decrease in inundation duration and frequency during the traditional flood season.
JOURNAL OF HYDROLOGY
(2022)
Article
Multidisciplinary Sciences
Christina Orieschnig, Jean-Philippe Venot, Sylvain Massuel, Khy Eam Eang, Kong Chhuon, Sambo Lun, Sokly Siev, Gilles Belaud
Summary: This brief provides the necessary data for calculating and assessing the robustness of a water level-flood link (WAFL) in the Cambodian Mekong Delta. The data includes raster files for two zones in the delta, as well as in-situ water level data, vegetation extents, and raster files representing the incidence and duration of inundations. These data are important for analyzing long-term changes in Monsoon inundations in the region.
Article
Engineering, Civil
Ludovic Cassan, Flavia C. Miranda, Pascale Laurens
Summary: The objective of this study was to improve the design criteria of rock-ramp fish passes by better understanding the physics of frictional phenomena caused by obstacles. Experiments on square-shaped obstacles in a scale model were conducted to analyze drag and bottom friction forces. The findings allow for more accurate flow comparisons and have implications for river dam equipment projects.
JOURNAL OF HYDRAULIC ENGINEERING
(2023)
Article
Agronomy
Isaac A. Ramos-Fuentes, Yassin Elamri, Bruno Cheviron, Cyril Dejean, Gilles Belaud, Damien Fumey
Summary: Maize production is crucial for food security worldwide, but climate change is expected to reduce water availability, affecting yield. AgriVoltaics (AV) systems can enhance maize resilience by reducing radiation and irrigation needs, but shade from panels may impact crop development and production.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agricultural Engineering
Francisco N. N. Cantero-Chinchilla, Gilles Belaud, Oscar Castro-Orgaz, Luciano Mateos
Summary: This study aims to classify gated culverts and establish an experimental dataset for analyzing discharge relationships. The experiment resulted in a classification of 22 inlet control and 19 outlet control cases, which confirmed the suitability of the proposed scheme and provided further insight into flow classification.
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
(2023)
Article
Remote Sensing
Christina Anna Orieschnig, Gilles Belaud, Jean-Philippe Venot, Sylvain Massuel, Andrew Ogilvie
Summary: This study evaluates supervised classifiers on the Google Earth Engine platform, finding that GTB and RF have the best classification performance, while combining optical and radar imagery can improve accuracy.
EUROPEAN JOURNAL OF REMOTE SENSING
(2021)
Proceedings Paper
Automation & Control Systems
Rabab Yassine, Francois Peres, Olivier Frysou, Helene Roux, Ludovic Cassan
Article
Management
Rabab Yassine, Francois Peres, Olivier Frysou, Helene Roux, Ludovic Cassan
JOURNAL OF CONTINGENCIES AND CRISIS MANAGEMENT
(2020)
