Article
Engineering, Aerospace
Patrick Meyer, Sebastian Luck, Tobias Spuhler, Christoph Bode, Christian Huehne, Jens Friedrichs, Michael Sinapius
Summary: This study presents a multidisciplinary design methodology for a morphing aileron based on pressure-actuated cellular structures, focusing on the transient dynamic system behavior. The findings demonstrate high structural resistance against external forces and the feasibility of high actuation speeds. Future research will include fluid-structure interaction and load alleviation capability assessment.
Article
Environmental Sciences
Tianyuan Zheng, Shaobo Gao, Tao Liu, Qingsheng Meng, Xilai Zheng, Marc Walther, Chunhui Lu
Summary: Previous research on land reclamation's impact on seawater intrusion mainly focused on saltwater wedge modification and freshwater-saltwater interface dynamics. However, the effect of land reclamation on the discharge of pollutants like nitrate has been overlooked. This study uses field-scale simulations to reveal the influence of reclamation area and soil permeability on nitrate pollution and saltwater redistribution. It was found that land reclamation can cause significant redistribution based on the initial saltwater-freshwater interface and modify nitrate discharge, leading to drastic changes in subsurface nitrate distribution. The study also highlights the relationship between reclamation area, permeability, and variance. By considering both saltwater intrusion and nitrate enrichment, engineers can optimize their land reclamation strategies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Mou Yang, Hao Luo, Rongxuan Xie, Pengcheng Wu, Mingzheng Yang, Lvchao Yang, Hu Xue
Summary: This study analyzed the impact of casing eccentricity and different fluids on wellbore circulating pressure, developed improved frictional pressure loss correlations based on computational fluid dynamics, and successfully designed the optimal method for primary cementing with field tests. The results demonstrated the importance of real-time downhole pressure management by adjusting operational parameters in low pressure and leakage formations.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Xiang Shen, Dajun Yuan, Liqiang Cao, Dalong Jin, Xiangsheng Chen, Zhenfeng Gao
Summary: This study investigates the influence of environmental factors on the sealing performance of shield tail grease using indoor model tests and computational fluid dynamics simulations. The results show that increased temperature, seawater, and sand mixing weaken the sealing performance of the grease. The viscosity and length of the grease cavity have a linear positive relationship with the time of initial water leakage.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Computer Science, Interdisciplinary Applications
Shiori Kageyama, Naoki Takeishi, Hiroki Taenaka, Takeshi Yoshida, Shigeo Wada
Summary: High-flow oxygen therapy using a tracheostomy tube is a promising clinical approach to reduce the work of breathing in tracheostomized patients. However, the effects of tracheostomy tube connectors on positive end-expiratory pressure (PEEP) are still unknown. This study developed a platform to assess PEEP under respiration by coupling three-dimensional simulation of airflow in a tracheostomy tube connector with a lumped lung model. Numerical simulations showed that the geometrical parameters of the connector have an impact on PEEP.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2022)
Article
Chemistry, Multidisciplinary
Thinh Quy Duc Pham, Jichan Jeon, Daeseong Jo, Sanghun Choi
Summary: This study utilized the two-fluid model in OpenFOAM software to investigate bubble dynamics and flow physics in U- and C-shaped pipes with different gravitational directions. The results showed that dynamic pressure in two-phase flow is strongly influenced by buoyancy force, and Dean flows were observed in curved pipes.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Christoph Baum, Hartmut Hetzler, Simon Schroeders, Tim Leister, Wolfgang Seemann
Summary: A novel physical and mathematical model of foil air bearings was developed with a focus on computational time-efficiency for rotor dynamic investigations. The model, which accounts for nonlinear deformation behavior and linear viscous damping, was validated using published experimental data and reduction technique, showing a decrease in computation time up to a factor of 1000 with a slight loss in accuracy. The bearing model was also coupled with a rigid rotor model to demonstrate its applicability during a run-up and coast-down.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Environmental
Tianze Wang, Fuyuan Yang, Qixiang Hu, Song Hu, Yangyang Li, Minggao Ouyang
Summary: This paper investigates the changes in the combustible area after leakage of a double ferrule joint. By constructing and calibrating a computational fluid dynamics model and using the schlieren method to observe hydrogen leakage, the study reveals the reduction of combustible volume due to forced convection in the hydrogen system. The findings contribute to addressing safety concerns in hydrogen energy technology.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Computer Science, Interdisciplinary Applications
Xi Zhao, Linghsuan Meng, Xu Tong, Xiaotong Xu, Wenxin Wang, Zhongrong Miao, Dapeng Mo
Summary: This study aims to validate a novel computational strategy for determining the reference value of microcirculatory resistance in patients with cerebrovascular stenosis. Results show a strong correlation and agreement between the computational strategy and invasive pressure measurements as well as transcranial Doppler assessment.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Polymer Science
Ali Ahmed Salem, Kwan Yiew Lau, Zulkurnain Abdul-Malek, Nabil Mohammed, Abdullah M. Al-Shaalan, Abdullrahman A. Al-Shamma'a, Hassan M. H. Farh
Summary: This study assesses the health condition of a polluted polymeric insulator by estimating its time-frequency characteristics through analyzing the leakage current. The results show that the proposed indicators are capable of evaluating the insulator conditions effectively.
Article
Engineering, Environmental
Mayra Vera, Diego M. Juela, Christian Cruzat, Eulalia Vanegas
Summary: The study focused on the mathematical modeling and experimental validation of acetaminophen removal using sugarcane bagasse as an adsorbent. A computational fluid dynamic (CFD) model was developed to simulate the ACT concentration inside the adsorption column and wall channeling effect, showing a high mass transfer zone and slow adsorption rate with increasing bed height. The results demonstrate the usefulness of CFD analysis in understanding the adsorption process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Shine Win Naung, Mohammad Rahmati, Hamed Farokhi
Summary: This paper focuses on the complex flow and blade structure interaction in modern aeronautical Low-Pressure Turbines, exploring flutter and forced response mechanisms as well as the impact of various sources of unsteadiness on blade aeroelastic instabilities. It bridges a crucial gap in the knowledge of aeroelastic modeling and analysis of modern LPTs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Remote Sensing
Hongpeng Wang, Wenhao Sun, Changli Zhao, Sujie Zhang, Jianda Han
Summary: This paper numerically simulated the flow fields and aerodynamic disturbance of the tilt-rotor unmanned aerial vehicle (TRUAV) in the transition mode using transient CFD. A dynamics model of the TRUAV was established, and the three-dimensional flow field distribution and required aerodynamic parameters were analyzed. A cascade PID control strategy was designed and simulation results showed the stability of the model even at a maximum roll angle of 20 degrees.
Article
Energy & Fuels
Kun Zhang, Zhaoping Meng, Shimin Liu
Summary: The isosteric heat of adsorption is a key parameter for assessing the thermodynamic properties of gas adsorption and migration in coals. Results from isotherm experiments show that Langmuir V-L in coal is dependent on temperature and coal structures, and adsorption heat is higher in intact coals than in deformed coals. Additionally, diffusion coefficients decrease with depressurization processes, and gas diffusion mainly occurs in different pore sizes corresponding to Fick's, transitional, and Knudsen diffusion. The high initial diffusion coefficient in deformed coals is related to the low isosteric heat of adsorption.
Article
Computer Science, Interdisciplinary Applications
Ramtin Gharleghi, Arcot Sowmya, Susann Beier
Summary: In this study, a deep learning technique was proposed as an alternative method to calculate blood flow-induced shear stresses in coronary bifurcations. The model showed high fidelity predictions and significantly reduced computational cost compared to traditional computational fluid dynamics methods.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2022)
Article
Environmental Sciences
Joseph Daniel Pineda Sandoval, Jose Antonio Arciniega-Nevarez, Xitlali Delgado-Galvan, Helena M. Ramos, Modesto Perez-Sanchez, P. Amparo Lopez-Jimenez, Jesus Mora Rodriguez
Summary: This research proposes a methodology that uses multi-objective optimization to place pumps operating as turbines (PATs) to energize street lighting, monitor the water network, and charge small electric vehicles. The methodology selects PATs based on maximizing power recovery, minimizing system pressure, and maximizing recoverable energy. The benefits include reducing emissions, saving fuel and electricity consumption, and providing socio-economic impact. Each PAT can supply street lighting, water network monitoring, and a charging station, with a return on investment of up to 1.07 at 12 years.
Article
Physics, Fluids & Plasmas
Rodolfo Pienika, Jose Cataldo, Helena M. Ramos
Summary: This study used the open source fluid flow solver, caffa3d, to simulate the performance of a medium-scale Hydrostatic Pressure Machine (HPM) and found good correlation with experimental curves. Convergence and grid sensitivity analysis were performed to validate the simulation model.
Article
Water Resources
Helena M. Ramos, Alban Kuriqi, Oscar E. Coronado-Hernandez, P. Amparo Lopez-Jimenez, Modesto Perez-Sanchez
Summary: This research proposes a methodology to improve the accuracy and reliability of data in water systems and increase their performance. It suggests a pressure-reduction strategy and the implementation of pumps as turbines (PATs) in the Sta Cruz, Madeira water system. By using a developed digital twin model, it reduces water demand by 3.3 hm(3), increases renewable generation by 1.2 GWh, saves over 1.5 Meuro, and decreases CO2 emissions by 530 tons annually, thus contributing to sustainable development goals (SDGs) evaluation.
URBAN WATER JOURNAL
(2023)
Article
Environmental Sciences
Dalia M. Bonilla-Correa, Oscar E. Coronado-Hernandez, Vicente S. Fuertes-Miquel, Mohsen Besharat, Helena M. Ramos
Summary: The estimation of thermodynamic behavior during filling processes with entrapped air in water pipelines is a complex task, and the rigid water column (RWC) model has been used as a numerical method to predict critical points. This research presents the computation of critical points and the application of the Newton-Raphson method to obtain a unique equation for engineers to directly compute variables. The proposed formulation was validated through an experimental set of data.
Article
Environmental Sciences
Helena M. Ramos, Oscar E. Coronado-Hernandez, Pedro A. Morgado, Mariana Simao
Summary: In recent years, reversible hydro-pumping systems have gained significant interest for their flexibility, economy, and environmental benefits. Designing reversible lines requires considering dynamic effects and extreme pressures that can occur during normal and emergency operations. This research focuses on turbine operation and presents mathematical models and experimental validations for understanding the system complexity and estimating dynamic effects.
Article
Environmental Sciences
Helena M. Ramos, Alban Kuriqi, Mohsen Besharat, Enrico Creaco, Elias Tasca, Oscar E. Coronado-Hernandez, Rodolfo Pienika, Pedro Iglesias-Rey
Summary: One of the main factors contributing to water scarcity is water loss in water distribution systems, which mainly arises from a lack of knowledge in the design process and poor maintenance/management. To improve system efficiency, the current study establishes a smart water grid with a digital twin for monitoring and management. Through a case study in Madeira Island, Portugal, the developed methodology significantly reduces water losses and improves system efficiency, resulting in meaningful economic benefits.
Article
Environmental Sciences
Duban A. Paternina-Verona, Oscar E. Coronado-Hernandez, Hector G. Espinoza-Roman, Vicente S. Fuertes-Miquel, Helena M. Ramos
Summary: This research uses a 3D CFD model to analyze the continuous changes in the shape of an air-water interface during filling operations, with different hydro-pneumatic tank pressures and air pocket sizes as initial conditions. The study focuses on the rapid filling process in a 7.6 m long PVC pipeline with an irregular profile, using OpenFOAM software. The scenarios were validated with experimental measurements and the 3D CFD model proved to be suitable for simulating them. Additionally, a mesh sensitivity analysis was conducted to study air pocket pressure patterns, water velocity oscillations, and the different shapes of the air-water interface.
Article
Green & Sustainable Science & Technology
Elias Tasca, Mohsen Besharat, Helena M. Ramos, Edevar Luvizotto Jr, Bryan Karney
Summary: This paper summarizes the negative impact of entrapped air on the energy consumption and conveyance capacity of water conveyance systems. It identifies common conditions that lead to air accumulations and compares the effects on gravity and pumped lines, showing that gravity lines are more prone to these negative effects. The paper also critically assesses two common strategies for air management: employing air valves or using hydraulic means for air removal.
Article
Energy & Fuels
Prajwal S. M. Guruprasad, Emanuele Quaranta, Oscar E. Coronado-Hernandez, Helena M. Ramos
Summary: This research compares batteries and pumped storage hydropower (PSH) as energy storage systems in microgrids and evaluates their economic and technical performance using the HOMER model. The results suggest that a microgrid with PSH has lower net present cost and levelized cost of energy, making it a more economical option.
Article
Environmental Sciences
Emanuele Quaranta, Helena M. M. Ramos, Ulf Stein
Summary: During the Digital Decade, the EU faces the challenges of green and digital transitions, which are interconnected. These transitions are relevant in various aspects of life, including industry, energy, transportation, environmental management, and daily life. Digital solutions have economic benefits in the water sector, such as reducing leakage, preventing sewer overflows, and improving hydropower generation. The total benefits for the EU and UK are estimated at EUR 5.0 billion, 0.14 billion, and 1.7 billion per year, respectively.
Article
Chemistry, Multidisciplinary
Duban A. Paternina-Verona, Oscar E. Coronado-Hernandez, Hector G. Espinoza-Roman, Vicente S. Fuertes-Miquel, Helena M. Ramos
Summary: In hydraulic engineering, researchers have developed mathematical and numerical tools to understand the interaction between water flow and trapped air in pipes during emptying processes. They compared experimental and numerical models and found that mathematical models offered relevant information in a short simulation time, while CFD models provided detailed visualization of complex phenomena but required longer simulation times.
APPLIED SCIENCES-BASEL
(2023)
Article
Water Resources
Andres F. Villalba-Barrios, Oscar E. Coronado-Hernandez, Vicente S. Fuertes-Miquel, Jairo R. Coronado-Hernandez, Helena M. Ramos
Summary: This research presents a new methodology to calculate base flow rates in gauged rivers for extreme events based on statistical correlations of daily flows. Estimating base flow rates in storm hydrographs associated with different return periods is challenging, but this methodology avoids the need for complex aquifers analysis. Computed base flow rates were validated using observed storm hydrographs, and the analysis confirmed the effectiveness of using multiannual monthly mean flows to estimate base flow for flood hydrographs with different return periods.
Article
Physics, Fluids & Plasmas
Alfredo M. Abuchar-Curi, Oscar E. Coronado-Hernandez, Jairo Useche, Veronica J. Abuchar-Soto, Argemiro Palencia-Diaz, Duban A. Paternina-Verona, Helena M. Ramos
Summary: This study conducted an experimental and numerical analysis of impeller blades in centrifugal pumps, revealing that double curvature impellers can enhance pump performance.
Article
Environmental Sciences
Elias Tasca, Mohsen Besharat, Helena M. Ramos, Edevar Luvizotto Jr, Bryan Karney
Summary: This study provides a comprehensive sensitivity analysis of the transient behavior in a rising water pipeline with an air valve. The paper examines the stages of water hammer associated with a pump trip and investigates the relationship between the transient magnitude and air valve outflow capacity. The study finds that the relationship is nonlinear and roughly follows a logistic curve shape.
