Article
Acoustics
F. S. Cal, G. A. S. Dias
Summary: This study investigates the propagation of rotational waves at the interface between two fluids. By generalizing the Stokes definitions, it is found that the average velocity of wave propagation is greater than the general average velocity of the fluid. For interfacial waves of small amplitude, the excess kinetic and potential energy have the same magnitude but opposite signs, and the excess kinetic energy is proven to be negative in the nonlinear case.
Article
Computer Science, Interdisciplinary Applications
Lingyun Ding, Jingfang Huang, Jeremy L. Marzuola, Zhuochao Tang
Summary: The QBX technique accurately evaluates layer potentials in the integral equation reformulations of partial differential equations, while the QB2X method extends this by using new local complex polynomial and plane wave type expansions to represent Laplace layer potentials. QB2X method allows analysis of far-field contributions and high frequency properties, and can be easily adopted in existing fast integral equation solvers based on FMM.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Marine
Huan Wang, Erzheng Fang, Mingze Wu, Lianjin Hong, Zongru Li
Summary: This article investigates the ultra-low-frequency circular waves generated by an underwater oscillating sphere, which serve as a basis for underwater long-range target detection. The study utilizes linear potential flow theory and multipole expansion theory to analyze the circular waves caused by sphere oscillation in finite deep fluid, as well as the interface waves generated by target oscillation in a two-layer fluid through numerical analysis. The experimental results confirm that the waves generated by the oscillating sphere are surface gravity waves, with consistent trends with simulation results.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Eun-Hong Min, Sanghwan Heo, Hyunjai Yang, Ju-Han Lee, WeonCheol Koo, Kwang-Jun Paik, Young-Gyu Kim, Hyoung Rok Kim
Summary: Waves induced by an immersed moving body in a two-layer fluid were experimentally and numerically studied using water and cooking oil as the two-layer fluid. The results were compared with numerical calculations and theoretical solutions obtained through computational fluid dynamics (CFD) program. The characteristics of the generated waves, such as wave patterns and wavelengths, showed qualitative similarity to the numerical results and theoretical values. The dominance of wave propagation mode, either baroclinic or barotropic, depended on the velocity of the immersed body.
Article
Physics, Fluids & Plasmas
Jie Chen, Aiguo Xu, Dawei Chen, Yudong Zhang, Zhihua Chen
Summary: The two-dimensional Rayleigh-Taylor instability in compressible flow with intermolecular interactions is analyzed using the discrete Boltzmann method. The effects of interfacial tension, viscosity, and heat conduction on the instability are investigated. It is observed that interfacial tension has varying influences on perturbation amplitude, bubble velocity, and entropy production rates at different stages of the instability. Viscosity and heat conduction are found to inhibit the instability.
Article
Chemistry, Physical
Dimitrinka Arabadzhieva, Anna Y. Gyurova, Ivan Minkov, Alexander Chinarev, Elena Mileva
Summary: This study investigates the smart regulation of properties of aqueous solutions of two-antennary oligoglycines molecules through variations in pH and initial incubation time. The results show that the size distribution of tectomers is bimodal in acidic conditions and becomes mono-modal in alkaline conditions, with the dimensions of tectomers shifting towards larger entities as pH increases. These trends are further enhanced with longer incubation times. The study provides essential insights into the coupling mechanism of bulk and interfacial phenomena, laying the groundwork for further fine-tuning of tectomer formation and potential applications in drug nanocarriers and impurity extraction from water media.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Materials Science, Multidisciplinary
L. D. Robinson, K. S. N. Vikrant, J. E. Blendell, C. A. Handwerker, R. E. Garcia
Summary: A thermodynamically consistent phase field formulation was developed to describe the premelted surface layer in Sn nanoparticles. Four behavior regimes were discussed based on particle size, showing the different characteristics of nanoparticles under different conditions.
Review
Chemistry, Applied
Chuanfang (John) Zhang
Summary: MXenes, as emerging 2D materials, exhibit unique advantages in electrical conductivity, electromagnetic interference shielding, and volumetric capacitance, attracting extensive research and applications. Interfacial assembly of MXenes helps reveal their versatility and impact on novel MXene systems, leading to enhanced device performance.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Physics, Fluids & Plasmas
Pedro O. S. Livera, Pedro H. A. Anjos, Jose A. Miranda
Summary: Our study investigates the linear and weakly nonlinear stages of the flow of a viscous ferrofluid annulus surrounded by nonmagnetic fluids in a Hele-Shaw cell under an external radial magnetic field. We found that the interplay of magnetic and surface tension forces on the inner and outer boundaries of the annulus leads to the formation of continuous interfacial patterns.
Article
Physics, Fluids & Plasmas
Habakuk Conrado, Eduardo O. Dias, Jose A. Miranda
Summary: In this study, the influence of interfacial rheology on the morphology of viscous fingering in Hele-Shaw cells was investigated. The results showed that interfacial rheology, despite stabilizing viscous fingering at the linear regime, actually promotes finger tip widening and enhanced finger tip-splitting events in the early nonlinear stages.
Article
Mechanics
Shaofeng Li, Chengcheng Yu, Suhui Qian, Jinbao Song, Anzhou Cao
Summary: The influence of linear shear flow on both surface and internal freak waves was studied using a two-layer model and a nonlinear Schrodinger equation, the regions where interfacial freak waves occur were identified via analysis of modulational instability, and the effects of positive and negative vorticity on the steepness and height of the waves during supercritical up-flow and down-flow were explored.
Article
Chemistry, Physical
Chi M. Phan
Summary: This study introduces a model for fitting surface tension of water/ethanol mixture across the complete composition range, and presents a new method for calculating the composition of the interfacial layer in binary liquid mixtures and surfactant solutions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Afraz Subratti, Lorale J. Lalgee, Nigel K. Jalsa
Summary: Lipophosphoramidates are a class of tunable amphiphilic molecules that enhance the bioavailability and selectivity of drug molecules. This study reports the synthesis of novel glyco-lipophosphoramidates and investigates their surface activity and aggregation behavior in aqueous solution using various techniques. The results demonstrate the potential for drug delivery or nanocarrier applications of these molecules.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Physics, Multidisciplinary
Jingcheng Ma, Ishrat Zarin, Nenad Miljkovic
Summary: Solid-liquid interfacial free energy (gamma SL) is difficult to measure, but this study presents a direct experimental measurement method for different solid materials. The results show that water-metal adhesion is 80% stronger than the cohesion energy of bulk water, which is consistent with previous quantum chemical calculations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jian Wei Khor, Ulri N. N. Lee, Jean Berthier, Erwin Berthier, Ashleigh B. Theberge
Summary: This study develops an open channel droplet microfluidic system that autonomously generates droplets at low capillary numbers and demonstrates various applications. The system offers enhanced usability, direct access to the droplet contents, easy manufacturability, compact footprint, and high customizability.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Engineering, Marine
M. N. Sreebhadra, K. R. Athul Krishna, D. Karmakar
Summary: This study investigates the wave transformation caused by the pile-rock porous structure combined with a vertical porous barrier under oblique wave action. The pile-rock breakwater effectively dissipates wave energy and provides additional stability compared to traditional rigid breakwaters. Numerical simulations are performed considering different configurations of the vertical barrier and evaluating wave reflection, transmission, and dissipation coefficients, as well as wave forces on the porous structure and the barrier interface. The results provide valuable insights for the design and analysis of composite breakwater systems to protect offshore facilities from high waves.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART M-JOURNAL OF ENGINEERING FOR THE MARITIME ENVIRONMENT
(2023)
Article
Engineering, Marine
Shivakumar B. Patil, Debabrata Karmakar
Summary: This study analyzes the interaction between gravity waves and submerged tandem breakwaters of different structural configurations using the Multi-Domain Boundary Element Method (MDBEM). The results show that adding an impermeable thin-walled reef structure in front of the primary submerged breakwater is effective in dissipating wave energy and optimizing wave transmission. The permeable and rubble mound type trapezoidal tandem breakwaters offer higher energy dissipation compared to other breakwaters.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART M-JOURNAL OF ENGINEERING FOR THE MARITIME ENVIRONMENT
(2023)
Article
Engineering, Multidisciplinary
S. Boral, T. Sahoo, M. H. Meylan
Summary: The interaction between surface gravity waves and an articulated flexible submerged plate under lateral compressive force is studied. The study considers small-amplitude plate response and linearized water wave theory in finite water depth. It is found that wave blocking occurs in the submerged plate mode when the plate is resting on a Winkler foundation, but not in the absence of the foundation. Four propagating wavenumbers exist within the blocking frequencies, with one in the surface mode and the others in the submerged plate mode.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Physics, Fluids & Plasmas
Kshma Trivedi, Amya Ranjan Ray, Parothidil Anjusree Krishnan, Santanu Koley, Trilochan Sahoo
Summary: This research investigates the hydrodynamic performance of an oscillating water column device on a sloping seabed under irregular incident waves. The results show that higher wave heights lead to larger amplitudes of inward and outward velocities, free-surface elevations, and flow characteristics. It is also observed that power generation and capture efficiency are higher when the seabed has moderate slopes.
Article
Engineering, Marine
Pouria Amouzadrad, Sarat Chandra Mohapatra, Carlos Guedes Soares
Summary: An analytical model of the interaction between a current load and a moored floating flexible structure was developed using the Timoshenko-Mindlin beam theory. Theoretical solutions for displacement, reflection, and transmission coefficients were obtained using the matching technique and orthogonal model coupling relation. The results were compared with calculations and experimental data from literature, and were found to be consistent with a numerical model. This analysis can provide valuable information for marine engineers designing floating flexible platforms in the marine environment.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
J. S. Rony, D. Karmakar
Summary: This study investigates a novel concept of utilizing six cone-cylinder-shaped point absorbers in a circular pattern around a submerged tension leg platform (STLP), fixed in position using tensioned mooring cables. The hybrid floating platform, consisting of an offshore wind turbine platform with a wave energy converter (WEC), reduces logistic costs and simplifies transportation. Numerical simulations are performed to analyze the behavior of the hybrid system under irregular wave conditions, including motion responses, power production, forces and moments at the base of the floating wind turbine, and tension on each tendon for different mooring configurations.
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY
(2023)
Article
Engineering, Ocean
A. K. Mohapatra, T. Sahoo
Summary: A numerical model is used to investigate the interaction between surface gravity waves and a floating dock with a submerged composite wavy porous plate. The study calculates various physical parameters and examines the influence of structural parameters. The results show that the presence of the wavy porous plate significantly reduces the wave force on the dock and the positioning of the plate plays a role in dissipating wave energy.
APPLIED OCEAN RESEARCH
(2023)
Article
Thermodynamics
Piyush Mohapatra, K. G. Vijay, Anirban Bhattacharyya, Trilochan Sahoo
Summary: The hydrodynamic performance of a shore-fixed oscillating water column (OWC) device with different bottom curvatures was investigated using both the Boundary Element Method (BEM) and Computational Fluid Dynamics (CFD). The resonating behavior and performance curve were found to be similar in both models, with convex bottom performing better at lower wave frequencies. The flow characteristics and free surface elevations inside and around the OWC chamber were also examined. This study is important for wave energy converter devices installed nearshore, as the bottom curvature significantly affects their hydrodynamic behavior and capture efficiency.
Article
Engineering, Marine
Yu Chan Guo, S. C. Mohapatra, C. Guedes Soares
Summary: A series of experimental model tests were conducted to investigate the performance of a combined membrane breakwater against regular and irregular incident waves. The study analyzed the dependence of various coefficients on breakwater design parameters and wave characteristics. The efficiency of the breakwater was analyzed by comparing different membrane combinations under different wave conditions.
Article
Engineering, Marine
Yu Chan Guo, S. C. Mohapatra, C. Guedes Soares
Summary: A series of experiments were conducted to investigate the performance of a newly proposed multi-layered flexible membrane breakwater under regular and irregular waves. The effects of various parameters on the efficiency of breakwaters were studied and discussed, including edge conditions, spring stiffness of mooring lines, wave height, wave period, breakwater height, submergence depth, membrane porosity, and membrane length. The wave transmission, reflection, and dissipation coefficients were measured to estimate the performance of the breakwater. The results showed that there is no significant difference in the overall trend of the transmission and dissipation coefficients between regular and irregular waves, but the reflection coefficient behaves differently in these two types of waves.
Article
Engineering, Marine
Kshma Trivedi, Amya Ranjan Ray, Parothidil Anjusree Krishnan, Santanu Koley, Trilochan Sahoo
Summary: This research investigates the hydrodynamic performance and efficiency of the LIMPET oscillating water column (OWC) device. The results show that higher incident wave heights promote additional vortex generation and increase the power produced by the device. The efficiency of the OWC device depends on various parameters.
Article
Mechanics
P. Negi, P. Kar, T. Sahoo, M. H. Meylan
Summary: Surface gravity waves interact with flexural waves to generate flexural gravity waves, triggered by higher lateral compressive stress for multiple propagating wave modes. This study investigates the scattering of obliquely incident flexural gravity waves at the articulation point of two semi-infinite heterogeneous floating elastic plates in finite water depth within a blocking dynamics regime. The dispersion curve shows three propagating wave modes within the blocking limits. The canonical eigenfunction expansion method is generalized to account for multiple wave modes. The energy relation is established using the conservation of wave energy flux and Snell's law of refraction, depending on the angles and amplitude of the scattered waves and wave energy transfer rates. The amplitude of scattering coefficients goes beyond the unit, diminishing the corresponding energy transfer rate for specific wave periods. Complete wave reflection occurs for oblique waves beyond a critical angle of incidence for a fixed period and prior to a critical angle of incidence at a higher angle of incidence. Removable discontinuities occur at the blocking and saddle points, while a jump discontinuity appears due to a change in the incident wave mode in the scattering coefficients. Surface plots reveal the irregular pattern of plate deflection within the blocking limits. Linear time-dependent plate displacement is simulated in two and three dimensions.
Article
Engineering, Marine
S. C. Mohapatra, Guedes Soares
Summary: An analytical model of moored floating flexible net cage systems was developed to study dynamics and wave loads. Results were compared with finite element analysis and experimental data, and various factors were analyzed for their effects on system performance. This study is important for the design of multiple floating fish cage systems in offshore aquaculture.
Article
Mechanics
S. Boral, Michael H. Meylan, T. Sahoo, B. -Y. Ni
Summary: This study investigates the scattering of flexural gravity waves caused by uneven bottom topography in the context of wave blocking, with a focus on the effects of multiple propagating wave modes on the solution procedures. Mathematical models are developed for two scenarios: a bottom step and a submerged rectangular breakwater. The energy balance relation is derived in both cases using the conservation of energy flux in the presence of multiple propagating wave modes. It is found that wave blocking occurs for different frequencies due to variations in water depth, making the problem more complex. The transmitted wave amplitude associated with the lower wavenumber within the blocking frequencies exceeds unity, and this excess energy is balanced by the corresponding energy transfer rate. Removable discontinuities are also observed at the blocking frequencies in the scattering coefficients, where group velocity ceases. In the context of floating ice sheets, the deflection is analyzed for frequencies within and outside the blocking limits.
Article
Engineering, Multidisciplinary
S. C. Barman, S. Boral, T. Sahoo
Summary: This study demonstrates the phenomenon of flexural-gravity wave blocking in a three-layer fluid with a floating ice covered surface and examines the effects of blocking dynamics on wave scattering by a linear crack in an ice sheet. Multiple propagating wave modes are found within the blocking frequencies, resulting in irregularities in the deflection of the ice sheet and interface elevations.
APPLIED MATHEMATICAL MODELLING
(2024)
