Article
Geosciences, Multidisciplinary
Ash Narkevic, Bea Csatho, Toni Schenk
Summary: Through studying the Greenland ice stream, it is found that Nioghalvfjerdsfjorden Glacier is the more stable one with no expected retreat in the near future, but there are some previously undetected changes that complicate the assessment. The glacier is found to have a complex network of basal channels that were stable until 2012, but since then, a central basal channel has been growing rapidly, possibly due to increased runoff and ocean temperatures. This change threatens to separate the northwestern and southeastern parts of the glacier.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Mechanics
Ai-Jun Li, Hui Fang, Yong Liu
Summary: This paper studies the interaction between water waves and a very large floating laminated disk in water of finite depth. An analytical solution and an approximated model are developed to calculate the deflection and bending moment of the disk, as well as the effects of different parameters on wave force and wave field.
Article
Engineering, Mechanical
Pengpeng Xu, Peter R. Wellens
Summary: This paper investigates the fully nonlinear fluid-structure interaction of large-scale floating photovoltaics in waves. The authors propose a unified Stokes perturbation method to seek for an analytical solution. The obtained solution is validated by comparing with existing literature.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Mechanics
Simone Michele, Siming Zheng, Federica Buriani, Alistair G. L. Borthwick, Deborah M. Greaves
Summary: This paper presents a study on the hydroelastic response of a flexible circular plate to water waves. The effects of water depth and plate rigidity on the dynamic behavior are considered. The experimental results match the theoretical predictions based on linear potential flow theory.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Mechanics
Vasily Kostikov, Masoud Hayatdavoodi, R. Cengiz Ertekin
Summary: The hydroelastic responses of floating elastic surfaces to incident nonlinear waves were studied using numerical simulations. The study considered a range of wave-structure conditions without restrictions on wave nonlinearity, number of surfaces, sizes, and rigidities. Results showed that the rigidity of the surface significantly affected wave reflection, and the spacing between multiple floating surfaces had a more significant effect on the wave field than their lengths. Additionally, the presence of smaller floating plates upwave remarkably modified the deformation and response of the downwave floating surface.
THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS
(2021)
Article
Mechanics
M. V. Flamarion, T. Gao, R. Ribeiro-Jr, A. Doak
Summary: In this paper, the flow structure of steady periodic traveling waves with constant vorticity on a dielectric fluid under the effect of normal electric fields is studied. The research findings reveal that the number of stagnation points in the flow is related to variations in the voltage potential, and the recirculation zones associated with the stagnation points are described in detail.
Article
Mechanics
Y. Z. Xue, L. D. Zeng, B. Y. Ni, A. A. Korobkin, T. I. Khabakhpasheva
Summary: The study investigates the hydroelastic symmetric response of a floating ice sheet caused by pressure moving on the ice lead or infinite ice sheet with a crack. By combining boundary integral method (BIM) and finite difference method, the study shows numerical results that agree well with available results and discusses the ice response under different load speeds. The effects of ice thickness, lead width, and load properties on the maximum deflection, stress, and wave-making resistance speeds are also discussed.
Article
Multidisciplinary Sciences
Andrew J. Christ, Paul R. Bierman, Joerg M. Schaefer, Dorthe Dahl-Jensen, Jorgen P. Steffensen, Lee B. Corbett, Dorothy M. Peteet, Elizabeth K. Thomas, Eric J. Steig, Tammy M. Rittenour, Jean-Louis Tison, Pierre-Henri Blard, Nicolas Perdrial, David P. Dethier, Andrea Lini, Alan J. Hidy, Marc W. Caffee, John Southon
Summary: Understanding the history of the Greenland Ice Sheet (GrIS) is crucial for determining its response to climate change and contribution to sea level rise. Through the analysis of subglacial sediment at the base of the Camp Century ice core, researchers have uncovered evidence of at least two episodes of ice-free, vegetated conditions in northwestern Greenland during the Pleistocene, suggesting that the GrIS persisted through much of the Pleistocene but experienced melting and reformation at least once since 1.1 million years ago.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Multidisciplinary
Oriol Colomes, Francesc Verdugo, Ido Akkerman
Summary: This work presents a novel monolithic Finite Element method for the hydroelastic analysis of very large floating structures (VLFS) with arbitrary shapes. It is stable, energy conserving, and does not require an iterative algorithm. The method enables a fully monolithic solution of the linear free-surface flow coupled with floating thin structures and is applicable in both frequency and time domains, with arbitrary order finite elements. The proposed approach accurately describes various hydroelastic phenomena of VLFS including elastic joints, variable bathymetry, and arbitrary structural shapes.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Marine
Dag Myrhaug, Muk Chen Ong
Summary: This article derives the time scale of pipeline scour caused by 2D and 3D nonlinear irregular waves and current for wave-dominant flow, providing a simple engineering tool for assessing equilibrium pipeline scour. The method assumes the random wave process to be stationary and narrow banded, applicable to a range of random waves plus current flow conditions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Thien Tran-Duc, Michael H. Meylan, Ngamta Thamwattana
Summary: In this study, a newly developed Smoothed Particle Hydrodynamics (SPH) algorithm is used to investigate the dynamics of a floating plate under impacts of regular water waves. The results show that the rigidity of the plate affects its deformation behavior, with stiffer plates deforming mainly in a simple bending mode and more flexible plates deforming more complexly. Additionally, the strong overflow and viscous effects alter the plate's dynamics.
Article
Mechanics
Bao-Yu Ni, Tatyana I. Khabakhpasheva, Yuriy A. Semenov
Summary: This study investigates a two-dimensional nonlinear problem of steady flow in a channel covered by broken ice and with arbitrary bottom topography. By utilizing velocity potential theory and a numerical procedure, the mathematical model successfully couples the nonlinear boundary conditions at the channel bottom and at the interface between the liquid and the layer of broken ice. The study finds that the broken ice significantly affects the waveforms, allowing for larger wave amplitudes in subcritical flows and making soliton waves gentler in supercritical flow regimes.
Article
Mechanics
Z. F. Li, G. X. Wu
Summary: The study focuses on the hydrodynamic problem of wave interaction with a ship near an ice sheet, using linearized velocity potential theory and a thin elastic plate model. Through the derivation and analysis of the Green function, an approximate and efficient solution procedure for ship/wave/ice sheet interactions is developed. Extensive numerical results for a modern icebreaker are provided, showing accurate results even near the ice edge and providing insight into complex ship/ice sheet interactions.
Article
Mechanics
Y. A. Semenov
Summary: This study investigates a two-dimensional nonlinear problem of steady flow past a body submerged beneath an elastic sheet. The mathematical model and integral hodograph method are employed to calculate the complex velocity potential of the flow, revealing results such as interface shape, bending moment, and pressure distribution for a wide range of depths of submergence. The obtained solution shows a strong nonlinear interaction of waves above the submerged body, with the existence of two waves on the interface caused by gravity and the elastic sheet respectively.
Article
Mechanics
A. S. Dosaev, M. I. Shishina, Yu. I. Troitskaya
Summary: This paper presents a numerical study of essentially nonlinear dynamics of surface gravity waves on deep water with constant vorticity using governing equations in conformal coordinates. The behavior of this class of solitary waves without the restrictive assumption of weak nonlinearity is investigated by using the exact Euler equations. It is shown that two-soliton collisions are almost elastic within the framework of the exact equations.