Article
Geosciences, Multidisciplinary
Marti Bayer-Raich, Salvador Jordana, Oscar M. Jaime, Timothy D. Lynch, Kevin B. McGillicuddy, Jordi Guimera, M. Javier Jaime
Summary: This study quantifies well screen head loss using numerical models and couples Darcy flow with turbulent flow at a sub-millimeter scale. It compares the performance of four different well screen types and provides a new empirical formulation to quantify screen head loss.
Article
Environmental Sciences
D. Panici
Summary: The study investigates the motion of large wood in rivers and suggests that the trajectory of the wood is influenced by factors such as flow conditions and release locations. Results indicate that large wood tends to follow preferential patterns along the channel after a transient motion. The study proposes a new model based on acceleration induced by hydrodynamic actions for predicting the transport of large wood, paving the way for comprehensive models in full-scale applications.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Xuefang Li, Vasileios Kitsikoudis, Emmanuel Mignot, Pierre Archambeau, Michel Pirotton, Benjamin Dewals, Sebastien Erpicum
Summary: This study systematically assessed the influence of geometric distortion on upscaled flow depths and discharge partition in laboratory studies of urban flooding, finding that the distortion ratio affects these parameters, with the effects stabilizing asymptotically for ratios above 5. The research provides valuable insights for offsetting bias induced by geometric distortion in practical laboratory studies of urban flooding.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Georg J. Houben, Okke Batelaan
Summary: Adolf and Gunther Thiem, father and son hydrogeologists, made significant contributions to the field, beyond the analytical models they are commonly associated with. Their practical work in designing water supply systems led to the development and improvement of methods still used today, while their scientific communication skills spread their knowledge internationally.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Cong Yuan, Lisha Zhu, Shiqi Liu, He Li
Summary: This study reveals the dynamics of water and oil cavitation flow through numerical simulation, showing that different types of cavitation occur in different positions in water and oil flow cases. Vortex cavitation in oil flow exhibits a paired structure, while in water flow it is more scattered. Attached cavitation at the poppet trailing edge in the water flow case almost disappears in the oil flow case, which is more stable.
APPLIED SCIENCES-BASEL
(2021)
Article
Mechanics
Quang-Thai Nguyen, Van-Tu Nguyen, Thanh-Hoang Phan, Trong-Nguyen Duy, Seong-Ho Park, Warn-Gyu Park
Summary: This paper numerically studies the dynamics of initially spherical bubble collapse near an oscillating rigid wall. Numerical simulations were conducted using a compressible two-phase flow model and the volume of fluid (VOF) interphase-sharpening technique on a general curvilinear moving grid. The effects of the oscillating wall on bubble collapse were investigated, and the interface deformation, jetting behavior, bubble collapse time, and bubble migration were determined.
Article
Environmental Sciences
Ruixue Jiang, Dongmei Han, Xianfang Song, Fandong Zheng
Summary: This study assessed the impact of reclaimed water recharge on the unconfined groundwater system, and found that recharge can increase groundwater table and storage with lesser environmental impacts.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Energy & Fuels
Jaeman Song, Jihye Han, Minwoo Choi, Bong Jae Lee
Summary: This article provides an in-depth review of charge transport models utilized to analyze the performance of near-field thermophotovoltaic (NF-TPV) devices, and a comprehensive examination of NF-TPV experiments performed to date. The article categorizes the analysis models into four categories and compares the results of each model. It also discusses the different approaches used in NF-TPV experiments and the experimental results achieved. Additionally, it introduces advanced concepts for improving NF-TPV performance.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
Bo Luo, Yanhui Han, George K. K. Wong
Summary: In this study, a particle transport model integrated into the fluid solver in FLAC was used to simulate the transport of particles in the near-wellbore region inside a hydraulic fracture. Complex flow behaviors, such as divergent flow near the fracture entrance and detouring flow around diverter packs, were successfully captured in this coupling system. The numerical implementation updated the fracture permeability, particle concentration, and velocities of fluid and particles in each time step to realize the coupled fluid flow and particle transport. Simulation results showed that the final shape of the particle bridging zone was determined by flow-driven and settling-driven particle transport.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Chemistry, Multidisciplinary
Zhaomin Peng, Dehai Zhang, Shuqi Ge, Jin Meng
Summary: In this study, a finite element model (FEM) is proposed to quantify the near-field interactions, and to investigate the edge effect and antenna effect in THz s-SNOM. Our results indicate that the proposed model can give us a better understanding of the near-field interactions and direct the parameter design of the probe for THz s-SNOM.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Hussain Shahzad, Baden Myers, Guna Hewa, John Boland, Tim Johnson
Summary: This study evaluates the performance of the Storm Water Management Model (SWMM) in representing water sensitive urban design (WSUD) elements in urban catchments. The results show that SWMM can accurately simulate runoff series before and after the installation of leaky wells, with the best performance achieved by using storage nodes to represent leaky wells at the catchment scale.
JOURNAL OF HYDROLOGIC ENGINEERING
(2021)
Article
Energy & Fuels
Hongjie Yan, Huimin Zhang, Thomas Hoehne, Yixiang Liao, Dirk Lucas, Liu Liu
Summary: This study validates the accuracy of the AIAD module implementation in ANSYS Fluent and investigates the effects of the subgrid wave turbulence model, turbulence damping model, and droplet entrainment model on the simulation results.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Environmental Sciences
Tomasz Dysarz, Tomasz Kaluza, Karolis Mickevicius, Jonas Veigneris, Pawel Zawadzki, Sebastian Kujawiak, Stanislaw Zaborowski, Joanna Wicher-Dysarz, Natalia Walczak, Jakub Niec, Raimundas Baublys
Summary: This paper focuses on the safety inlet navigation of the waterway below the bridge in Kaunas, Lithuania. It presents a study that utilizes georeferenced data and hydrologic data from public and non-public sources, as well as physical and numerical models, to analyze and validate the hydraulic conditions. The results demonstrate that the combination of hydrodynamic simulations and geoprocessing can be a powerful tool in hydraulic engineering analyses.
Article
Engineering, Geological
Habibollah Sadeghi, Ali Pak, Amin Pakzad, Peyman Ayoubi
Summary: Liquefaction is the phenomenon where saturated sandy soil loses its shear strength and turns into a liquefied state, causing detrimental consequences such as post-earthquake settlements and potential floods. Previous studies were limited in scope and did not consider realistic loadings and boundary conditions in field conditions. Accurate simulation of liquefaction-induced settlement requires fully coupled hydro-mechanical numerical analysis.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Energy & Fuels
Rong-Li Xu, Tian-Kui Guo, Xiao-Jia Xue, Wen-Bin Chen, Zhan-Qing Qu, Ming Chen, Zun-Peng Hu
Summary: The study establishes a model for the imbibition process in shale oil reservoirs and investigates the effects of capillary force, osmotic pressure, and pressure difference on imbibition. It is found that capillary force and osmotic pressure increase imbibition rate and decrease imbibition equilibrium time, while pressure difference does not affect the peak of imbibition exchange volume. Reservoir permeability, natural fracture density, and the number of interconnected fractures significantly impact imbibition equilibrium time.
Article
Geosciences, Multidisciplinary
Georg J. Houben
HYDROGEOLOGY JOURNAL
(2019)
Article
Environmental Sciences
Georg J. Houben, Stephan Kaufhold, Jan Dietel, Herbert Roehm, Jens Groeger-Trampe, Juergen Sander
ENVIRONMENTAL EARTH SCIENCES
(2019)
Article
Geosciences, Multidisciplinary
J. T. Hamutoko, V. E. A. Post, H. Wanke, M. Beyer, G. Houben, B. Mapani
HYDROGEOLOGY JOURNAL
(2019)
Article
Geochemistry & Geophysics
Vincent E. A. Post, Georg Houben, Leonard Stoeckl, Juergen Sueltenfu
Article
Geosciences, Multidisciplinary
Sarah L. Collins, Georg J. Houben
HYDROGEOLOGY JOURNAL
(2020)
Article
Engineering, Environmental
Georg Houben, Juergen Sander
Article
Geology
Georg J. Houben, Stephan Kaufhold, Roy McG Miller, Christoph Lohe, Matthias Hinderer, Meike Noll, Jens Hornung, Reginalda Joseph, Axel Gerdes, Maria Sitnikova, Martin Quinger
JOURNAL OF SEDIMENTARY RESEARCH
(2020)
Article
Environmental Sciences
Georg J. Houben, Vincent E. A. Post, Jens Groeger-Trampe, Maria H. Pesci, Juergen Sueltenfuss
Summary: Despite reduction measures, nitrate and aluminum concentrations remain high in aquifers in northwestern Europe. Long-term monitoring is necessary as the study reveals ongoing acidification of soil and groundwater at the forest site. Reactive transport models demonstrate how contaminants behave in groundwater over time, offering valuable predictions for future management strategies.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Annika Desens, Georg J. Houben
Summary: The radius of influence of a pumping well is crucial in hydrogeological applications and is often determined using empirical equations or the Sichardt method. To broaden the application range for varying porosities and aquifer thicknesses, a correction factor has been developed.
Review
Geosciences, Multidisciplinary
Georg J. Houben, Sarah Collins, Mark Bakker, Thomas Daffner, Falk Triller, Anvar Kacimov
Summary: Horizontal wells play an important role in hydrogeology and aquifer remediation, serving as an interesting option for many applications. Compared to vertical wells, horizontal wells have more complex flow patterns and higher yields, resulting in lower energy consumption and operational costs.
HYDROGEOLOGY JOURNAL
(2022)
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
Geosciences, Multidisciplinary
V. E. A. Post, T. Zhou, C. Neukum, P. Koeniger, G. J. Houben, A. Lamparter, J. Simunek
Summary: The creation of artificial dunes for coastal protection can affect freshwater lenses in coastal aquifers. The presence of vegetation on dunes influences recharge processes, with sparse vegetation leading to winter recharge and more vegetation resulting in slightly higher and annual recharge. Isotope sampling can provide important insights into the dynamics of recharge processes and their response to climate change.
HYDROGEOLOGY JOURNAL
(2022)
Article
Geochemistry & Geophysics
Stephan Costabel, Thomas Hiller, Georg Houben
Summary: Surface nuclear magnetic resonance (NMR) provides information on aquifer systems and iron mineralization. This makes it a potential tool for observing changing redox conditions and their impact on drinking water resources. Our study focuses on pyrite in a sandy aquifer serving as a natural denitrification buffer, and we observe significant changes in surface-NMR relaxation times.
Article
Geosciences, Multidisciplinary
Andreas Gaertner, Georg J. Houben, Maria A. Sitnikova, Roy McG Miller, Feiyu Wang, Mandy Zieger-Hofmann, Johannes Zieger, Ulf Linnemann
Summary: The sediments in two stacked megafans in the Owambo Basin of northern Namibia and southern Angola were examined using a long core borehole of about 400 meters in length. The lower Olukonda Megafan was found to have materials transported from the northwest originating from the Kunene Intrusive Complex and the Angola Shield, while the Cubango Megafan had sediments input from the north via the Cubango River. Detrital zircon U-Pb data combined with mineralogical and geochemical data confirmed two distinct provenances for the two megafans.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Water Resources
Anvar Kacimov, Georg Houben
Summary: This article analytically studies axisymmetric, steady-state, Darcian flows in homogeneous and isotropic aquifers towards a toroid or disk intake. The study considers both unbounded and bounded aquifers. The results show that an air-filled toroid drains much more water than an equipotential disk, and the size of an empty toroid is much smaller than that of a water-filled one at a given flow rate. Additionally, the high hydraulic gradients in the vicinity of modeled wells/tunnels can lead to colmation and suffusion. The article also evaluates the dissipation and drawdown effects in a specified zone in the far field.
HYDROLOGICAL SCIENCES JOURNAL
(2023)