Article
Computer Science, Software Engineering
Johannes Schwarz, Kristjan Axelsson, Daniel Anheuer, Martin Richter, Johanna Adam, Martin Heinrich, Ruediger Schwarze
Summary: Classical continuum methods are inadequate for gas flows with higher Knudsen numbers. Various models have been developed in the past to extend the classical Navier-Stokes equations (CNSE) and incorporate the particle nature of the medium. One such approach considers the kinetic theory of gases, leading to the derivation of the extended Navier-Stokes equations (ENSE). Numerical methods, such as the Finite-Volume-Method, are commonly used to solve the CNSE, and this study utilizes the open-source tool OpenFOAM to develop an ENSE solver, which offers significant performance advantages by implicitly discretizing certain terms and defining additional diffusion face-flux fields. The results are validated against analytical formulas using a simple microchannel test case.
Article
Geography, Physical
Qiuyue Tang, Dalan Liao, Zhe Lin, Ling He, Jiangxing Wei, Xiaoqian Duan, Yusong Deng
Summary: This study investigated the hydraulic characteristics and energy consumption characteristics of gully headcut erosion in the granitic red soil hills region of South China. The results demonstrated a fluctuating increase in hydraulic parameters with increasing headcut height, and a significant increase in energy consumption contribution with increasing headcut height.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Mechanics
D. Dehtyriov, C. R. Vogel, R. H. J. Willden
Summary: This paper presents an analytic model for analyzing co-planar turbine fences in channels driven by sinusoidally oscillating heads. The thrust from the turbines reduces flow rate and the overall power solution relies on turbine resistance, flow blockage, and channel characteristics. An optimal turbine fence deployment is determined using a return parameter and is found to be independent of channel characteristics. The impact of flow blockage and environmental constraints on the optimal arrangement are quantified and discussed.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Agronomy
Chaoxi Li, Zhiqin Li, Peisen Du, Juanjuan Ma, Simin Li
Summary: In this paper, a new Y-shaped labyrinth-channel drip irrigation emitter was proposed and its hydraulic performance was studied. The analysis showed that increasing the waist-arc angle improved the hydraulic performance, while decreasing the ratio of crown height to chord length also enhanced the hydraulic performance. Compared to the commonly used triangular-channel emitter, the Y-shaped emitter had better hydraulic performance.
Article
Materials Science, Multidisciplinary
Alexandre Guevel, Yue Meng, Christian Peco, Ruben Juanes, John E. Dolbow
Summary: A Darcy-Cahn-Hilliard model coupled with damage is developed to describe multiphase-flow and fluid-driven fracturing in porous media. The model is calibrated against experimental results, recovering a phase diagram differentiating different flow regimes and suggesting a new flow regime.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Energy & Fuels
Peisen Du, Zhiqin Li, Ruixia Hao, Juanjuan Ma, Da Yan
Summary: In this study, a tesla-shaped emitter based on the structure of the tesla valve was proposed to explore its hydraulic performance and energy dissipation mechanism. Computational fluid dynamics (CFD) technology was used to analyze the pressure-flow relationship, flow field, and head loss under different structural parameters. The main channel inlet section length and the secondary channel length were found to have significant impacts on the curve slope and flow. Regression models were established to predict the curve slope and flow based on the channel structure parameters. It was found that a larger flow ratio between the main channel and the secondary channel resulted in better hydraulic performance, and the unit loss coefficient showed excellent energy dissipation. The hedge mixing of the water flow was identified as the core of energy dissipation for the tesla-shaped emitter.
Article
Geosciences, Multidisciplinary
Georg J. Houben, Michael A. P. Kenrick
Summary: This paper analyzes the coefficients B and C of the Jacob (1947) equation, indicating that coefficient B includes linear losses from the gravel pack and wellbore skin in addition to aquifer losses, while coefficient C contains nonlinear laminar and turbulent losses from the gravel pack, screen inflow, and casing.
HYDROGEOLOGY JOURNAL
(2022)
Article
Environmental Sciences
Onur Dundar, Ismail Hakki Ozolcer, Emrah Dogan
Summary: This paper investigates the significance of loss coefficient in computing the hydraulic grade line of sewer systems. Experimental and numerical studies were conducted to determine the loss coefficient for two-way straight-through and angled manholes. The results show that the flow structure inside the chimney is a significant parameter for the magnitude of the energy loss coefficient.
Article
Energy & Fuels
E. A. Marfin, R. N. Gataullin, A. A. Abdrashitov
Summary: The article introduces a method of increasing oil recovery rate through acoustic stimulation technology, using borehole emitter to generate acoustic pressure oscillations to stimulate oil field production, achieving effects such as reducing water cut and increasing injectivity of injection wells.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Multidisciplinary Sciences
A. Campeau, D. Vachon, K. Bishop, M. B. Nilsson, M. B. Wallin
Summary: The study reveals large and rapid fluctuations in deep porewater CO2 concentration occurring every autumn in a boreal peatland, likely due to weakening of porewater thermal stratification leading to increased turbulent diffusion and rapid diffusion of deeper porewater CO2 towards the surface resulting in net losses. This phenomenon periodically decreases the peat porewater CO2 store by between 29 and 90 g C m(-2) throughout autumn, comparable to the peatland's annual C-sink.
NATURE COMMUNICATIONS
(2021)
Article
Robotics
C. David Remy, Zachary Brei, Daniel Bruder, Jan Remy, Keith Buffinton, R. Brent Gillespie
Summary: This paper introduces the concept of the Fluid Jacobian, which describes the power transmission between the fluid and mechanical domains in soft robotic systems. It demonstrates that the Fluid Jacobian is a generalization of the traditional kinematic Jacobian and can relate fluid pressure and flow to task space forces and velocities. The paper also provides theoretical derivations, focuses on special cases, and illustrates the practical applicability of the Fluid Jacobian through examples.
INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH
(2023)
Article
Thermodynamics
Kai Wen, Dan Qiao, Chaofei Nie, Yangfan Lu, Feng Wen, Jing Zhang, Qing Miao, Jing Gong, Cuicui Li, Bingyuan Hong
Summary: This paper proposes an optimization method for the supply and demand balance of natural gas pipeline networks by considering carbon emission targets and making peak shaving and flow rate allocation schemes. The method accurately describes the hydraulic situation under each allocation scheme and can optimize economic efficiency by 15.58%. It also reduces annual carbon emissions by 58% in large-scale pipeline networks.
Article
Geosciences, Multidisciplinary
Bo Li, Xiaofeng Cui, Liangchao Zou, Vladimir Cvetkovic
Summary: The study found that there is a certain relationship between normal stiffness and permeability in fracture structures, and the simple relationship between them can be obtained at different scales and orientations.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Mechanics
Balagopal Manayil Santhosh, Marcello Lappa
Summary: This analysis extends previous work on thermovibrational flow to investigate the existence of solid particle attractors and improve control over particle targeting. The relationship between vibration inclination, multi-directional temperature gradient, and system dimensionality opens up new pathways for attractors. Various new solutions are found using a simple geometry.
Article
Environmental Sciences
Antonietta C. Turturro, Maria C. Caputo, Horst H. Gerke
Summary: The study compared the MIP and QSC methods with standard ones to determine the retention curves of subsoil clods and calcareous rocks over most of the moisture range. The porosity characteristics of soil and rock samples showed bi- and trimodal PSDs. The MIP and QSC methods proved to be relatively fast and reliable for measuring a wider range of the retention curve.
VADOSE ZONE JOURNAL
(2022)
Article
Engineering, Civil
Herman A. Mahmoud, Dragan Savic, Zoran Kapelan
JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT
(2017)
Article
Engineering, Environmental
E. Forconi, Z. Kapelan, M. Ferrante, H. Mahmoud, C. Capponi
WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY
(2017)
Article
Engineering, Civil
Herman A. Mahmoud, Zoran Kapelan, Dragan Savic
JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT
(2018)
Article
Engineering, Civil
Herman A. Mahmoud, Zoran Kapelan, Dragan Savic
JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT
(2018)
Article
Engineering, Civil
Diego Paez, Yves Filion, Mario Castro-Gama, Claudia Quintiliani, Simone Santopietro, Chris Sweetapple, Fanlin Meng, Raziyeh Farmani, Guangtao Fu, David Butler, Qingzhou Zhang, Feifei Zheng, Kegong Diao, Bogumil Ulanicki, Yuan Huang, Jochen Deuerlein, Denis Gilbert, Edo Abraham, Olivier Piller, Alicja Balut, Rafal Brodziak, Jedrzej Bylka, Przemyslaw Zakrzewski, Yuanzhe Li, Jinliang Gao, Cai Jian, Chenhao Ou, Shiyuan Hu, Sophocles Sophocleous, Eirini Nikoloudi, Herman Mahmoud, Kevin Woodward, Michele Romano, Giovanni Francesco Santonastaso, Enrico Creaco, Armando Di Nardo, Michele Di Natale, Attila Bibok, Camilo Salcedo, Andres Aguilar, Paula Cuero, Sebastian Gonzalez, Sergio Munoz, Jorge Perez, Alejandra Posada, Juliana Robles, Kevin Vargas, Marco Franchini, Stefano Galelli, Joong Hoon Kim, Pedro Iglesias-Rey, Zoran Kapelan, Juan Saldarriaga, Dragan Savic, Thomas Walski
JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT
(2020)
Proceedings Paper
Computer Science, Artificial Intelligence
Matthew B. Johns, Herman A. Mahmoud, Edward C. Keedwell, Dragan A. Savic
GECCO'20: PROCEEDINGS OF THE 2020 GENETIC AND EVOLUTIONARY COMPUTATION CONFERENCE
(2020)
Proceedings Paper
Computer Science, Artificial Intelligence
Matthew B. Johns, Herman A. Mahmoud, David J. Walker, Nicholas D. F. Ross, Edward C. Keedwell, Dragan A. Savic
PROCEEDINGS OF THE 2019 GENETIC AND EVOLUTIONARY COMPUTATION CONFERENCE (GECCO'19)
(2019)
Proceedings Paper
Engineering, Civil
Zoran Kapelan, Dragan Savic, Herman Mahmoud
XVIII INTERNATIONAL CONFERENCE ON WATER DISTRIBUTION SYSTEMS, WDSA2016
(2017)