Article
Engineering, Marine
Yu Hsiao, Shih-Chun Hsiao, Philip Li-Fan Liu
Summary: In this study, the interaction between a solitary wave and a bottom-mounted, submerged elastic plate was numerically investigated. The effects of plate height, plate thickness, and the Young's modulus of plate material on the hydrodynamics were studied using a fluid structure interaction solver, a turbulence closure model, and a volume of fluid approach. The plate displacement was calculated using the Euler-Bernoulli beam theory. The wave nonlinearity and plate material properties were found to have significant effects on wave reflection, transmission, and dissipation.
Article
Mechanics
Tejaswin Parthasarathy, Yashraj Bhosale, Mattia Gazzola
Summary: This paper presents analytical solutions to a problem involving a visco-elastic solid layer sandwiched between two fluid layers. The system dynamics are explained based on fluid viscosity and solid elasticity using wave and boundary layer theory. The findings provide a physical interpretation of elasto-hydrodynamic coupling and have potential applications in various biophysical phenomena. Additionally, the obtained solutions serve as rigorous benchmarks for testing numerical solvers for coupled incompressible fluid-hyperelastic solid and multi-phase systems.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Marine
Siddharth Gupta, Atul Sharma, Amit Agrawal, Mark C. Thompson, Kerry Hourigan
Summary: In this study, the effects of geometrical and kinematic parameters on the propulsive performance of hydrofoils were investigated. The results show that leading and trailing edge curvatures improve hydrofoil performance and stability, while increasing thickness decreases performance. The optimal conditions for maximum propulsion efficiency involve minimal flow separation without a separating vortex, while maximum thrust generation occurs with moderate flow separation without significant fluid induction around the trailing edge. These findings provide valuable insights for understanding fish propulsion efficiency and have practical applications in the design of autonomous underwater vehicles and micro-air vehicles.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Mathematics, Applied
Eduard Rohan, Robert Cimrman, Salah Naili
Summary: The study focuses on acoustic wave propagation in a poroelastic medium with periodic structure, examining the influence of permanent seepage flow on wave propagation. By homogenization and wave dispersion analysis, the impact of advection flow and microstructure geometry on wave propagation properties is explored.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Materials Science, Multidisciplinary
Elisa A. Bergkamp, Clemens V. Verhoosel, Joris J. C. Remmers, David M. J. Smeulders
Summary: This paper presents a model for fluid-driven propagation of discrete fractures in poroelastic continua. The model considers the skin permeability and fluid slip effects at the fracture walls, which are particularly important for subsurface applications. The development of a fracture propagation criterion requires the incorporation of all dissipative mechanisms involved. This work proposes a thermodynamically consistent J-integral formulation for fracture propagation based on the theory of linear elastic fracture mechanics. The proposed poroelastic J-integral formulation is validated using analytical approximations in the stationary setting. The propagation criterion is implemented in an extended finite element method (X-FEM) simulation framework for propagating fractures, providing insights into the role of skin and slip effects on fluid-driven fracture propagation in poroelastic media.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Marine
Alexander Korobkin, Tatiana Khabakhpasheva
Summary: This paper studies the mathematical modeling of visco-elastic plate breaking and the consequent deflection of the plate. By using a simplified formulation, the authors model the plate as a thin visco-elastic plate with constant thickness and clamped edges. The plate deflection is caused by a gradually increasing aerodynamic pressure, and the plate breaks instantly when a modified fracture criterion is met. The motion of the plate parts after breaking is highly unsteady and dependent on the plate's viscous properties.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Martina Bukac, Shawn C. Shadden
Summary: In this study, a poroelastic model for intraluminal thrombus (ILT) was introduced to investigate its impact on the risk of abdominal aortic aneurysm (AAA) rupture. Numerical simulations were performed on three different patient-specific geometries, indicating that the presence of ILT may reduce wall stress in AAA. However, the permeability of ILT has little effect on the Peak Wall Stress (PWS) of AAA, with similar values obtained for both porous and nonporous ILT models.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Mathematics, Interdisciplinary Applications
Qingyong Zhu, Shun Lu, Dongheng Lai, Junjun Sun
Summary: In this paper, the fluid structure coupling problems of a porous medium with fractal characteristics under initial pressure were studied using finite difference and finite element coupling algorithms. The study found that increasing the fractal dimensions led to an increase in porosity and a decrease in both elastic modulus and Poisson's ratio. The material with fractal features had smaller stress and strain values compared to the material without fractal characteristics. The fractal porous media effectively reduced pressure wave peak and prevented vibration of the cylinder.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2022)
Article
Energy & Fuels
Enbin Liu, Xingjie Wang, Wanwei Zhao, Zhongya Su, Qikun Chen
Summary: This study investigated the abnormal vibration of pipelines at Yongchang gas station, proposing a vibration reduction scheme of increasing pipe diameter and adding appropriate constraints which was verified through simulation. The main conclusions include identifying fluid pressure fluctuation as the root cause of abnormal vibration, noting that vibration becomes more severe with larger gas transmission volumes, and determining that the proposed scheme has the best vibration reduction effect.
Article
Engineering, Multidisciplinary
Zi-Fei Meng, A-Man Zhang, Jia-Le Yan, Ping-Ping Wang, Abbas Khayyer
Summary: A hydroelastic fluid-structure interaction (FSI) solver based on the Riemann-SPH method is proposed in this study. The Riemann-SPH method is used to model elastic structures by modifying the Cauchy stress. This solver eliminates the need for artificial viscous force and achieves good results. For the fluid, the conventional Riemann-SPH with a low-dissipation limiter is adopted to simulate incompressible free surface flows. The structure solver is coupled with the fluid solver by considering force balance. The accuracy and robustness of the FSI solver are verified through benchmarks and hydroelastic FSI tests.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Tohid Adibi, Seyed Esmail Razavi, Shams Forruque Ahmed, Hussein Hassanpour, Neda Mohammadzadeh, S. M. Muyeen
Summary: Controlling noise pollution is crucial in various industries, and the use of elastic plates has a significant impact. However, the effect of a rib and elastic plate on the acoustic properties of a channel for different Reynolds numbers has not been investigated. This study examines the acoustic and flow impacts of a rib and elastic plate, and the results show a 27% increase in transmission loss at the highest position of the elastic plate. By reducing the length of the elastic plate by 50%, the mean transmission loss is reduced by 9%. The findings are important for engineers in designing aircraft, automobiles, and cooling/heating systems.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Marine
Jian Yang, Zhaochen Sun, Shuxiu Liang
Summary: This paper investigates the water impact of an elastic plate with/without flanges, focusing on the influences of support conditions and flanges. The study shows that stronger support conditions result in higher vibration frequencies and greater forces in the structure. Flanges can reduce high-frequency components of structure vibration, with frequencies between 40 and 60 Hz being less affected.
Article
Engineering, Marine
Bing Xue, Shi-Ping Wang, Yu-Xiang Peng, A-Man Zhang
Summary: This paper establishes a novel Riemann SPH-RKPM fluid-structure interaction numerical model, which improves stability and accuracy by introducing an improved dissipation limiter and treating the fluid-structure interaction force in a new way.
Article
Mathematics, Applied
Qinghang Cai, Ronghua Chen, Kailun Guo, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: An enhanced moving particle semi-implicit method is developed in this paper for simulating incompressible fluid flow and Fluid-Structure Interaction (FSI). The fluid models for FSI are improved based on the LSMPS method, and the elastic structure models and fluid-structure coupling schemes are developed. Various strategies are employed to reduce the influence of mechanical vibration of elastomers on fluid calculation. The models are validated step by step, and the results show a good performance of the developed method on simulating incompressible fluid flow and FSI.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Weicheng Huang, M. Khalid Jawed
Summary: This study investigates the fluid-structure interaction between two helical filaments under low Reynolds number conditions. It reveals that the filaments attract and come closer to each other in a viscous environment, potentially leading to physical contact. By systematically sweeping parameters, the bundling behavior is quantified, shedding light on the physics of microbial locomotion.
COMPUTERS & FLUIDS
(2021)
Article
Biotechnology & Applied Microbiology
Rowayda Ali, Florencia Saravia, Andrea Hille-Reichel, Daniel Haerrer, Johannes Gescher, Harald Horn
Summary: This study investigated the enhancement of propionic acid production from a model feedstock mimicking kitchen waste. The results showed that the goat cheese inoculum was significantly more efficient for propionic acid production. Enhanced propionic acid production was observed by a combination of high hydraulic retention time (HRT) with low organic loading rate (OLR).
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Review
Green & Sustainable Science & Technology
Anne Bogler, Aaron Packman, Alex Furman, Amit Gross, Ariel Kushmaro, Avner Ronen, Christophe Dagot, Colin Hill, Dalit Vaizel-Ohayon, Eberhard Morgenroth, Enrico Bertuzzo, George Wells, Hadas Raanan Kiperwas, Harald Horn, Ido Negev, Ines Zucker, Itay Bar-Or, Jacob Moran-Gilad, Jose Luis Balcazar, Kyle Bibby, Menachem Elimelech, Noam Weisbrod, Oded Nir, Oded Sued, Osnat Gillor, Pedro J. Alvarez, Sandra Crameri, Shai Arnon, Sharon Walker, Sima Yaron, Thanh H. Nguyen, Yakir Berchenko, Yunxia Hu, Zeev Ronen, Edo Bar-Zeev
NATURE SUSTAINABILITY
(2020)
Article
Biochemical Research Methods
Michael T. Sturm, Harald Horn, Katrin Schuhen
Summary: In recent years, there has been extensive research on developing a cost-effective and easily applicable method for detecting microplastics using Nile red and its derivatives. Additionally, the influence of different solvents and water pH values on the dyeing process was investigated by analyzing fluorescence spectra. The developed method was also tested on sea salt samples.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Agricultural Engineering
Rowayda Ali, Florencia Saravia, Andrea Hille-Reichel, Johannes Gescher, Harald Horn
Summary: The study found that the production of propionic acid (PA) and volatile fatty acids (VFAs) was significantly influenced by the chosen inoculum and adjusted pH value. The cheese inoculum showed the highest PA production rates and yields at pH 6 in both untreated and thermally pretreated dog food.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Alondra Alvarado, Stephanie West, Gudrun Abbt-Braun, Harald Horn
Summary: Hydrolysis of particulate organic matter is a limiting step in biological wastewater treatment. The concentration of high molecular weight organic matter increases over the first three days, while the oxygen utilization rate continuously develops, confirming the presence of easily biodegradable organic matter.
Review
Engineering, Environmental
Keke Xiao, Gudrun Abbt-Braun, Harald Horn
Article
Engineering, Environmental
Victoria Griessmeier, Jan Wienhoefer, Harald Horn, Johannes Gescher
Summary: This study investigated the efficiency of nitrate elimination and microbial communities in a denitrification bed over a period of more than three years. It found that temperature and hydraulic retention time are the main factors impacting denitrification efficiency, and the simple design of denitrification beds may result in different flow paths through the reactor.
Article
Microbiology
Tobias Jung, Max Hackbarth, Harald Horn, Johannes Gescher
Summary: The study used an adaptive laboratory evolution experiment to enhance the growth capabilities of a cathodic biofilm forming microorganism, leading to a population with up to fourfold higher biofilm accumulation rate and more uniform biofilm morphology. Genomic variant analysis revealed a genetically heterogeneous population with potential targets for future genetic engineering to optimize cathodic growth. These results also shed light on the underlying processes enabling cathodic biofilm formation.
Article
Biochemistry & Molecular Biology
Robert Niestroj-Pahl, Lara Stelmaszyk, Ibrahim M. A. ElSherbiny, Hussein Abuelgasim, Michaela Krug, Christian Staaks, Greta Birkholz, Harald Horn, Tian Li, Bingzhi Dong, Lars Daehne, Andreas Tiehm, Stefan Panglisch
Article
Agricultural Engineering
Giorgio Pratofiorito, Max Hackbarth, Carmen Mandel, Siyavuya Madlanga, Stephanie West, Harald Horn, Andrea Hille-Reichel
Summary: The study focused on hydrogenotrophic methanation using membrane biofilm reactor, achieving high methane production despite low membrane surface to reactor volume ratio, showcasing improved mass transfer through direct delivery of substrate gases to biofilm.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Chemical
Annika Bauer, Michael Wagner, Harald Horn, Florencia Saravia
Summary: The use of optical coherence tomography (OCT) for in situ scale study allowed for visualization and quantification of scale layers in a membrane distillation system. Temperature variation had a significant influence on the formation of calcite scale layers, while different water matrices resulted in the formation of different chemical and morphological scale layers. However, the configuration of air gap and direct contact showed no difference in scaling formation.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Prantik Samanta, Harald Horn, Florencia Saravia
Summary: Intensive livestock farming has had a negative impact on the environment, resulting in the release of ammonia and nitrous oxide, groundwater nitrate pollution, and eutrophication of rivers and estuaries. This study establishes direct relationships between meat production and nitrogen loss through manure, and also reports the energy demand for ammonium nitrogen recovery from manure.
Article
Biochemistry & Molecular Biology
Ali Sayegh, Simon Merkert, Joscha Zimmermann, Harald Horn, Florencia Saravia
Summary: This study evaluated the application of ceramic ultrafiltration membranes in the crossflow mode for separating particles and oil in water emulsions. The results showed that a membrane-pore size of 10 nm achieved the highest stable permeability with less fouling, and alkaline cleaning at pH 12 proved to be the most effective in removing fouling.
Article
Biochemistry & Molecular Biology
Prantik Samanta, Harald Horn, Florencia Saravia
Summary: Antimicrobial resistances pose a major threat to global human health and are predicted to cause the deaths of 10 million people by 2050. This study focused on the diversity and abundance of antimicrobial resistance genes (ARGs) in pig farms and biogas digestate slurry in Germany, as well as their removal using a microfiltration-nanofiltration process. The study found a wide range of ARGs in the samples, with higher initial ARG concentrations leading to greater removal efficiency.
Article
Environmental Sciences
Amelie Chabilan, Nicolette Landwehr, Harald Horn, Ewa Borowska
Summary: The quantification of antibiotics in sediments is challenging, but necessary to understand their fate in aquatic systems. In this study, a comprehensive method was developed to determine 19 antibiotics in river sediments. By considering the physical-chemical properties of the analytes, a new classification method based on log(Kow) values was proposed to select suitable extraction solvents. After comparing different extraction protocols, an effective method using acetonitrile and phosphoric acid achieved high recovery rates for antibiotics with log(Kow) values above zero.
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.
