Article
Computer Science, Interdisciplinary Applications
Y. Zhang, S. Fan, S. Li, J. Yin
Summary: Understanding the effects of shallow behavior is important for accurate kinematic predictions of drag anchors. Original methods only consider deep failure mechanisms, but by using plasticity analysis and varying tangential and normal bearing factors, the distinct shallow behavior of the anchor can be captured.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Marine
Yao-Zhao Zhong, Hwa Chien, Meng-Yu Lin, Anna Wargula, Jia-Lin Chen
Summary: This study investigates the hydrodynamics in the coastal boundary layer (CBL) using field measurements and theoretical approaches. The results suggest that the bottom drag coefficient and horizontal eddy viscosity coefficient have an impact on tidal phase difference. Additionally, the study finds that wave conditions influence the bottom drag coefficient, and the flow structure is affected by lateral stress.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Eslam Gabreil, Haitao Wu, Chen Chen, Jiaye Li, Matteo Rubinato, Xing Zheng, Songdong Shao
Summary: In this study, a 3D numerical model based on the SPH approach is developed to simulate near-shore current flows. Two major improvements are made to address the turbulence and rough boundary effects, and the computed results are compared with laboratory measurements, showing the accurate simulation of near-shore free surface flows over rough topography.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Physical
Oscar Gutierrez-Varela, Ruben Santamaria
Summary: The study further reveals the molecular nature of the drag force exerted by a fluid on a body using Newtonian and Brownian theories. The results not only show good agreement with experimental data, but also demonstrate the hydrodynamic limit for very small objects.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Diana Carolina Guio-Perez, Anna Kohler, Anna Prati, David Pallares, Filip Johnsson
Summary: The aim of this study is to investigate the effects of bulk solids properties on the drag experienced by large spheres in an emulsion of group-B solids and analyze the reaction of different suspensions to applied shear rates. The results show that an increase in bulk solids size, angularity, and density leads to a decrease in the terminal velocity of the sphere. Beds of larger, more angular, or denser bulk solids exhibit lower levels of shear stress at lower shear rates.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Zhonglin Gao, Chenlong Duan, Yuemin Zhao, Pengfei Mao
Summary: The apparent viscosity of a binary medium in a pulsed fluidized bed was measured by varying the gas velocity, pulsation frequency, and fine particle content. The results showed that increasing gas velocity and fine particle content decreased the apparent viscosity, while pulsation frequency first decreased and then increased the apparent viscosity, reaching a minimum value in the range of 4-6 Hz. Adjusting the gas velocity and fine particle content effectively reduced the apparent viscosity and improved the separation process. A model for predicting apparent viscosity in a pulsation separation fluidized bed was established with good accuracy.
Article
Thermodynamics
B. Qaddah, L. Soucasse, F. Doumenc, S. Mergui, Ph Riviere, A. Soufiani
Summary: In this study, we aim to analyze the different heat transfer mechanisms in a confined shallow cave embedded in a rock massif under seasonal variations of ground temperature. We consider heat conduction in the rock massif, radiative heat transfer between cave walls, and turbulent natural convection inside the cave. We solve the natural convection problem using large-eddy simulations and obtain the thermal boundary conditions for the cave walls from a large-scale model. We identify two different flow regimes and discuss the use of Newton's law to describe convection heat fluxes at the cavity walls.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Review
Computer Science, Interdisciplinary Applications
Zhenjiang Zhao, Ling Zhou, Ling Bai, Bo Wang, Ramesh Agarwal
Summary: The coupling of computational fluid dynamics (CFD) and discrete element method (DEM) provides an effective approach to study the motion behavior of particles in dense fluidized beds. This method has been successfully applied and verified at different scales, demonstrating its reliability in predicting particle motion in fluidized beds.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Chemical
Sirisha Parvathaneni, Sujay Karmakar, Vivek V. Buwa
Summary: The mode of gas-injection influences the local bubbling and jetting behavior in gas-solid fluidized beds, which in turn affects the mixing, distribution, and performance of heat and mass transfer and reactions. This study simulated gas-solid flow with particles of different densities using uniform and two-jet distributors, and validated the predictions with measurements. The effects of different models on the bubbling characteristics under dense and dilute flow conditions were analyzed.
Article
Mathematics, Interdisciplinary Applications
Zhenjiang Zhao, Ling Bai, Weidong Shi, Linjian Li, Mahmoud A. El-Emam, Ramesh Agarwal, Ling Zhou
Summary: This study investigates the influence of microscopic forces and energy on the macroscopic motion of particles in a dense gas-solid fluidized bed using the CFD-DEM coupling approach. Experimental validation shows that drag force is positively correlated with inlet flow rate and particle diameter, tangential contact force dominates near the inlet, fluid pressure gradient force can be neglected at certain positions, and particle energy is positively correlated with inlet flow rate and particle diameter due to bubble formation.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Engineering, Civil
Jie Hu, Chiang C. Mei, Che-Wei Chang, Philip L. F. Liu
Summary: This paper presents a new theoretical framework for studying small-amplitude periodic water waves through emergent flexible vegetation in water of intermediate depth. The model successfully reproduces the results of rigid stationary forest and shows good agreements with laboratory data for flexible cylinders, involving the effects of cylinder material properties on wave attenuation within the model.
COASTAL ENGINEERING
(2021)
Article
Energy & Fuels
Maryelen H. Miyoshi, Nezia de Rosso, Cezar O. R. Negrao
Summary: This study accurately models the forces acting on the drill string assembly during pull-out, predicting whether a plug is formed, and demonstrates potential for detecting field problems.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Yun-Hang Cho, My Ha Dao, Andrew Nichols
Summary: With the increased flood risk, it is crucial to have robust waterway design and management. Open channels are commonly used for gathering and transporting groundwater, but current simulations often neglect the physical roughness of the bed and assume a rigid surface for the free water. This may affect the behavior of turbulent structures near the free surface.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Engineering, Aerospace
Hongqing Lv, Shan Liu, Jiahao Chen, Baoli Li
Summary: The energy consumption of a vehicle is closely related to the resistance it receives, and studying drag reduction is crucial for energy conservation and emissions reductions. By controlling the coherent structure in turbulence, it is possible to achieve drag reduction in the boundary layer.
Article
Mathematics, Applied
Alex Doak, Guido Baardink, Paul A. Milewski, Anton Souslov
Summary: The breaking of detailed balance in fluids due to Coriolis forces or odd-viscous stresses has significant effects on the dynamics of surface waves. This study examines weakly and strongly nonlinear waves in a three-dimensional fluid with vertical odd viscosity, with or without the Coriolis effect. It is found that odd viscosity induces unexplored nonlinear effects in shallow-water waves, caused by stresses on the surface and stress gradients in the bulk. The results have implications for the collective dynamics of many-vortex systems in oceanic and atmospheric geophysics.
SIAM JOURNAL ON APPLIED MATHEMATICS
(2023)
Article
Acoustics
Kirill V. Horoshenkov, Timothy Van Renterghem, Andrew Nichols, Anton Krynkin
Article
Computer Science, Interdisciplinary Applications
Ehsan Kazemi, Andrew Nichols, Simon Tait, Songdong Shao
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2017)
Article
Engineering, Mechanical
Santiago Rojas Argues, Matteo Rubinato, Andrew Nichols, James D. Shucksmith
FLOW MEASUREMENT AND INSTRUMENTATION
(2018)
Article
Chemistry, Analytical
Andrew Nichols, Matteo Rubinato, Yun-Hang Cho, Jiayi Wu
Article
Chemistry, Analytical
Shiyao Wang, Jesus Leonardo Corredor Garcia, Jonathan Davidson, Andrew Nichols
Article
Engineering, Environmental
Abigail Legge, Andy Nichols, Henriette Jensen, Simon Tait, Richard Ashley
Summary: This study assessed the transportability of food waste disposer particles within a sewer system through laboratory experiments. Results showed that most food particles are unlikely to deposit in the sewers during normal operational flows, except for egg shell particles due to their higher specific gravity.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Zhihua Xie, Binliang Lin, Roger A. Falconer, Andrew Nichols, Simon J. Tait, Kirill V. Horoshenkov
Summary: This paper presents a large-eddy simulation study of turbulent free surface flow over a natural rough bed, investigating the effects of roughness on turbulence properties and free surface dynamics. The study successfully compares predicted results with experimental data, revealing that roughness on the bed generates small waves on the free surface in cases of low submergence.
JOURNAL OF HYDRAULIC RESEARCH
(2022)
Article
Engineering, Civil
Yiqi Wu, Simon Tait, Andrew Nichols, Jamil Raja
Summary: This study introduces a Markov model to simulate the potential future service condition of various classes of UK railway drainage assets based on observed historical changes. Linear regression analysis was conducted on distinct asset groups to quantify the influence of construction material, size, shape, and location on the degradation process rate. The results were integrated with a continuous time Markov chain model to enhance the accuracy of degradation rate prediction for different drainage asset classes.
JOURNAL OF INFRASTRUCTURE SYSTEMS
(2021)
Article
Geochemistry & Geophysics
Jiayi Wu, Andrew Nichols, Anton Krynkin, Martin Croft
Summary: This paper presents a novel method for measuring three-dimensional water surface dynamics in a partially filled pipe. The method involves tinting the water white with titanium dioxide, projecting a stochastic pattern of light onto the water surface, and capturing the pattern on the deformed water surface using high-resolution cameras. The surface fluctuation and velocity parameters of turbulent flow in partially filled pipes can be measured using this method.
Article
Engineering, Civil
Jiayi Wu, Andrew Nichols, Anton Krynkin, Martin Croft
Summary: Coherent flow structures in turbulent flows play a critical role in understanding flow processes, but their detection methods are limited for 1D data. This paper presents a phase-space method that can objectively detect these structures, using extremes in velocity, acceleration, and jerk, as well as considering the first and second derivative of velocity.
JOURNAL OF HYDRAULIC RESEARCH
(2022)
Article
Environmental Sciences
Yun-Hang Cho, My Ha Dao, Andrew Nichols
Summary: With the increased flood risk, it is crucial to have robust waterway design and management. Open channels are commonly used for gathering and transporting groundwater, but current simulations often neglect the physical roughness of the bed and assume a rigid surface for the free water. This may affect the behavior of turbulent structures near the free surface.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Correction
Engineering, Civil
Fabio Muraro, Giulio Dolcetti, Andrew Nichols, Simon J. Tait, Kirill V. Horoshenkov
JOURNAL OF HYDRAULIC RESEARCH
(2021)
Article
Engineering, Civil
Fabio Muraro, Giulio Dolcetti, Andrew Nichols, Simon J. Tait, Kirill Horoshenkov
Summary: In the last two decades, there has been a considerable increase in interest in the free-surface behaviour of gravity-driven shallow turbulent flows. Observing free-surface behaviour is believed to provide useful information about the hydrodynamic characteristics of the flow and enables remote monitoring of river flows. This paper reviews the state-of-art in this area, aiming to gather relevant information, use uniform terminology, and analyze gaps in knowledge about the linkages between free-surface behaviour and underlying hydrodynamic processes.
JOURNAL OF HYDRAULIC RESEARCH
(2021)
Article
Water Resources
Matteo Rubinato, Andrew Nichols, Yong Peng, Jian-min Zhang, Craig Lashford, Yan-peng Cai, Peng-zhi Lin, Simon Tait
WATER SCIENCE AND ENGINEERING
(2019)
