Article
Engineering, Chemical
Haihai Gao, Changhong Guo, Lingxiao Quan, Shuai Wang
Summary: This paper focuses on the frequency domain fluid-structure interaction (FSI) vibration characteristics of aircraft hydraulic pipe with complex constraints. The linear partial differential fourteen-equation model is used to describe the nonlinear FSI dynamics of pipes conveying fluid with high-speed, high-pressure, a wide Reynolds number, and the vibration frequency range. The resulting models are solved by the improved Laplace transform transfer matrix method (LTTMM) in the frequency domain. The dynamic response characteristics of an aircraft hydraulic pipe containing diverse constraints are investigated numerically and experimentally under four types of working conditions.
Article
Environmental Sciences
Gonzalo Garcia-Alen, Olalla Garcia-Fonte, Luis Cea, Luis Pena, Jeronimo Puertas
Summary: The study utilized 2D models based on the shallow water equations for simulating flow through weirs and presented an experimental dataset consisting of 194 experiments. A comparison between the experimental data and numerical results was conducted to quantify discrepancies due to non-fulfillment of the hydrostatic pressure hypotheses. The experimental dataset provided can be valuable for validating other modeling approaches.
Article
Mathematics, Applied
Sovanna Mean, Koichi Unami, Hisashi Okamoto, Masayuki Fujihara
Summary: This study investigates determining water surface profiles of steady open channel flows, using the concept of viscosity solutions to describe characteristics of possibly non-smooth and discontinuous solutions, achieving conservation of momentum and the entropy condition. Generalized solutions to some Dirichlet problems are not always unique.
APPLIED MATHEMATICS AND COMPUTATION
(2022)
Article
Environmental Sciences
Feng-Cong Jia, Wei-Jie Wang, Ling-Hua Liu, Jin-Jin Li, Ai-Ping Huang, Jing Zhang, Yi-Cheng Fu, Yang Yu
Summary: This study tackles the problems of complex expressions and low simulation accuracy in research on water flow under vegetated environments. By utilizing environmental hydraulics and genetic algorithm theories, the researchers successfully construct a formula for calculating the resistance coefficient for flexible vegetated flow. They establish a new quantitative relationship between the drag coefficient and the relative roughness of flexible vegetation, providing valuable theoretical support for vegetation restoration.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Mathematics, Applied
Zehba Raizah, Arshad Khan, Saadat Hussain Awan, Anwar Saeed, Ahmed M. Galal, Wajaree Weera
Summary: This investigation presents the exact solution of an unsteady fractional second-grade fluid flow induced by the time dependent motion of a bottom plate. The flow is constrained by two parallel walls at the sides and is normal to the bottom plate. The exact solution is obtained using Laplace and Fourier transformations, and the constitutive equations for the second-grade fluid are derived using the Caputo-Fabrizio time fractional differential operator. The flow characteristics are enhanced for higher values of time variable in impulsive and constantly accelerated motion, while they are opposed for sine and cosine oscillations.
Article
Soil Science
German F. Camussi, Silvia Imhoff, Diogenes L. Antille, Roberto P. Marano
Summary: This study evaluated the hydraulic performance of an existing mole drains system and validated the use of Hooghoudt's drainage spacing equation for a specific type of soil. The results showed that a mole drains spacing of 4 meters is appropriate for managing excess water, and soil fissures can enhance the hydraulic conductivity of the soil.
SOIL & TILLAGE RESEARCH
(2022)
Article
Mathematics, Interdisciplinary Applications
Ndolane Sene
Summary: This paper studies the analytical solutions of fractional fluid models described by the Caputo derivative. By combining the Fourier sine and the Laplace transforms, the influence of model parameters on the dynamics of the equations is analyzed, and physical interpretations are proposed. Graphical representations illustrate the main findings of the paper, contributing to the solution of analytical solutions for fluid models.
FRACTAL AND FRACTIONAL
(2022)
Article
Environmental Sciences
Naifeng Zhang, Honglei Ren, Fei Lin
Summary: This paper proposes a method to determine the optimal regulation time based on the hydraulic response characteristics, and validates the method using an actual river diversion project. The results show that the change of water transfer flow is the most critical factor affecting the optimal regulation time.
Article
Energy & Fuels
Yarlong Wang, Wenda Li, Maurice B. Dusseault
Summary: The study focused on the response of a circular borehole in a coupled hydraulic-thermal-mechanical system to a constant fluid flow rate and a temperature step-change. A new coupled formulation based on a dual-porosity model was developed to simulate a naturally fractured stratum under non-isothermal and two-phase fluid flow conditions. Results showed that negative pore pressure and unexpected higher effective compressive stresses may be induced during cold fluid injection, potentially leading to yield or formation damage on the wellbore.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Mati Ur Rahman, Ali Althobaiti, Muhammad Bilal Riaz, Fuad S. Al-Duais
Summary: This article explores a biological population model using a specific numerical method. The numerical simulations reveal a relationship between the population density and the fractional order, showing that a higher fractional order leads to a higher population density. The results demonstrate that the method is suitable and highly accurate in terms of computational cost.
FRACTAL AND FRACTIONAL
(2022)
Article
Environmental Sciences
Wei Zeng, Chao Wang, Jiandong Yang
Summary: This paper presents a coupling method using the method of characteristics (MOC) and finite volume method (FVM) for hydraulic transient analysis in systems with both pipelines and open channels. The method allows for parameter transmission between the MOC and FVM regions through coupling boundaries, and has been validated to provide more reliable and accurate results compared to traditional methods.
Article
Mechanics
Q. Luo, G. Dolcetti, T. Stoesser, S. Tait
Summary: The water surface response to turbulent flow over a backward-facing step is investigated using high-resolution large-eddy simulation (LES). The LES method is validated using experimental data and the analysis reveals the interplay between turbulence structures and the dynamics of the water surface. The water surface deformation is mainly influenced by gravity waves and turbulence-driven forced waves. The study highlights the importance of decomposing water surface fluctuations to understand the underlying flow structure dynamics.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Manuel Nunez
Summary: The behavior of a plate in a conducting flow with parallel velocity and magnetic field is studied, showing the modification of background flow under perturbation; a complex inner structure of the boundary layer is formed when the perturbation varies with time; the perturbed quantities decay exponentially with time, oscillating spatial behavior decreases inversely with the square root of the distance to the plate.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2021)
Article
Environmental Sciences
P. J. Southard, J. P. L. Johnson, D. M. Rempe, A. M. Matheny
Summary: The spatial distribution of vegetation significantly influences the morphology and flow velocity of alluvial channels, with bed and bank vegetation playing key roles in width and depth adjustments.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Mechanical
Mehran Masoumifar, Suyash Verma, Arman Hemmati
Summary: This study evaluates the performance of Reynolds-averaged Navier-Stokes (RANS) models in simulating the characteristics of mean three-dimensional perturbed flows in pipes with targeted wall-shapes. The results suggest that the Standard k - epsilon model can accurately capture the pipeflow characteristics in response to introduced perturbation with smooth sinusoidal axial variations.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
