Article
Mechanics
Manita Chouksey, Carsten Eden, Goekce Tuba Masur, Marcel Oliver
Summary: We compare a higher-order asymptotic construction for balance in geophysical flows with the numerical method of 'optimal balance'. Both methods achieve balance in geostrophic and inertia-gravity wave modes, resulting in minimal residual wave emission. The performance of both methods is comparable in a benchmark setting, and they find approximately the same balanced state.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Dong Su, Hui Liu
Summary: In this paper, a Pollard's exact solution for geophysical internal waves in equatorial beta-plane approximation is presented, followed by the application of the short-wavelength perturbations method to demonstrate an instability threshold for eastward propagating geophysical internal waves in the equatorial beta-plane approximation.
Article
Mechanics
Yu Liang, Lili Liu, Xisheng Luo
Summary: Shock-tube experiments were performed to examine the effects of bubble competition and spike competition on the interface. The study highlights the differences in the influence of these competitions on the Richtmyer-Meshkov instability. The bubble-competition effect depends mainly on the initial spectra, while the spike-competition effect is determined by both the initial spectra and density ratio. A generalized, nonlinear, analytical model was established to quantify these effects.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Dong Su, Hongjun Gao
Summary: In this paper, Pollard's exact solution for nonhydrostatic geophysical internal waves with underlying currents in the f-plane approximation is presented. The exact solution of nonhydrostatic geophysical internal waves in the presence of underlying currents is constructed, extending Pollard's solution to include underlying horizontal, meridional, and vertical currents at mid-latitudes. Furthermore, it is shown that the underlying meridional and vertical currents are constant. At the equator, the vertical current term disappears and the meridional current term may vary both zonally and vertically.
Article
Geosciences, Multidisciplinary
Ming-Huei Chang
Summary: High-resolution observations of internal solitary waves (ISWs) show Kelvin-Helmholtz (KH) billows and breaking waveforms occurring in the lower periphery and trailing edges of the wave cores, respectively. Marginal instability (MI) is evident within wave cores with a critical value of 0.25 for the occurrence of KH instability. The cyclic process of MI preserves ISWs against breakdowns resulting from the uninterrupted growth of KH instability.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Zhiwu Chen, Gengbin Liu, Zhiyu Liu, Shaomin Chen, Huaihao Lu, Jiexin Xu, Yankun Gong, Jieshuo Xie, Yinghui He, Ju Chen, Yunkai He, Shuqun Cai
Summary: Wind-induced and tide-induced near-inertial internal waves (NIWs) in Luzon Strait can mutually enhance each other, with most of the additional near-inertial energy (NIE) coming from the tides. Neglecting tide-induced NIWs could lead to an underestimation of the total NIE by almost 50%.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Mechanics
A. Doak, R. Barros, P. A. Milewski
Summary: In this paper, mode-2 solitary waves in a three-layer stratified flow model are investigated. Localised traveling wave solutions to both the fully nonlinear problem and the three-layer Miyata-Choi-Camassa equations are found and compared. The existence of mode-2 embedded solitary waves and branches of mode-2 solitary waves with speeds beyond the mode-1 linear waves are shown. Additionally, the relationship between large amplitude embedded solitary waves and conjugate states of the problem is demonstrated.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Colin M. Huber, Nathaniel S. Barlow, Steven J. Weinstein
Summary: Industrial coating processes require accurate models to predict the response to disturbances. This study focuses on the signaling problem, which incorporates the effects of repetitive disturbances in thin liquid films. The research examines how a linear operator governing varicose waves in a thin liquid sheet affects the signaling response. The results show significant differences in the signaling response between neutrally stable flows and exponentially unstable systems.
Article
Mechanics
Francesco Tosto, Claudio Lettieri, Matteo Pini, Piero Colonna
Summary: The study of paradigmatic compressible one-dimensional flows provides insights into the loss mechanisms of fluid machinery components in power and propulsion systems. The research shows that in Rayleigh flows, energy is converted, while entropy is generated in Fanno flows due to friction. Molecular complexity and thermodynamic state significantly impact the performance of the working fluid.
Article
Mechanics
E. Polyachenko, I. G. Shukhman
Summary: We compare initial value and eigenvalue problems for two-dimensional perturbations of inviscid shear flow in a channel. Singular solutions called van Kampen modes are constructed, which form a complete set of eigenfunctions for any initial perturbation of stable wavy perturbations. A pair of discrete modes appears to ensure completeness in the unstable case.
Article
Mechanics
Michael Le Bars
Summary: Despite ongoing debates, the study on wave turbulence and its scale transfers is challenging due to experimental and numerical difficulties. The numerical study of Thomas & Ding sheds new light on the upscale transfer of waves in rotating shallow water equations and highlights weaknesses in the theoretical foundations. This work calls for improved modeling and has implications for understanding large-scale climatic features.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Yohei Onuki, Sylvain Joubaud, Thierry Dauxois
Summary: A new technique was developed to assess internal wave-driven mixing in the ocean through direct numerical simulations of stratified turbulence. The study found that the external wave can directly supply energy for turbulence and mixing, and the mixing coefficient tends to increase with the Fr number of the external wave. Disturbances in the model go through two stages, converting wave energy into turbulence energy and eventually dissipating it.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mathematics, Applied
Lili Fan, Hongjun Gao
Summary: This paper investigates three-dimensional capillary-gravity water flows governed by the geophysical water wave equations with all Coriolis terms retained. It is proven that the only possible flow with a constant vorticity vector results in vanishing vertical velocity, constant horizontal velocity, and a flat free surface.
ANNALI DI MATEMATICA PURA ED APPLICATA
(2021)
Article
Mechanics
Shibin Cao, Jiaao Hao, Igor Klioutchnikov, Herbert Olivier, Karl Alexander Heufer, Chih-Yung Wen
Summary: This study investigates the flow characteristics of hypersonic flows over compression ramps with different leading-edge radii using numerical simulations and global stability analysis. The results show that increasing the leading-edge radius can suppress flow separation, reduce aerodynamic heating, and stabilize the flow system.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Geosciences, Multidisciplinary
Hugo K. H. Olierook, Richard Scalzo, David Kohn, Rohitash Chandra, Ehsan Farahbakhsh, Chris Clark, Steven M. Reddy, R. Dietmar Mueller
Summary: The study presents a methodology to fuse lithostratigraphic field observations with aeromagnetic and gravity data to build a 3D geological model in a small region of Gascoyne Province. Results show that 89% of the model region has >95% certainty for a particular geological unit, with narrow uncertainty regions at the boundaries between geological units. Beyond 4 km depth, additional geophysical survey data with longer wavelengths are needed to constrain the deeper subsurface.
GEOSCIENCE FRONTIERS
(2021)
Article
Physics, Fluids & Plasmas
Maxime Brunet, Thierry Dauxois, Pierre-Philippe Cortet
PHYSICAL REVIEW FLUIDS
(2019)
Article
Mechanics
Geraldine Davis, Thierry Dauxois, Timothee Jamin, Sylvain Joubaud
JOURNAL OF FLUID MECHANICS
(2019)
Article
Physics, Multidisciplinary
Geraldine Davis, Timothee Jamin, Julie Deleuze, Sylvain Joubaud, Thierry Dauxois
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Fluids & Plasmas
Pauline Husseini, Dheeraj Varma, Thierry Dauxois, Sylvain Joubaud, Philippe Odier, Manikandan Mathur
PHYSICAL REVIEW FLUIDS
(2020)
Article
Mechanics
Timothee Jamin, Takeshi Kataoka, Thierry Dauxois, T. R. Akylas
Summary: The study investigates the evolution of mean flow induced by a three-dimensional propagating internal gravity wave beam in a uniformly stratified fluid, revealing three distinct stages: resonant growth, saturation of streaming and onset of horizontal advection, and establishment of a quasi-steady state. The theoretical model proposed in this study, which extends previous work by accounting for horizontal advection and viscous diffusion effects, is in excellent agreement with experimental observations and numerical simulations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
T. Dauxois, T. Peacock, P. Bauer, C. P. Caulfield, C. Cenedese, C. Gorle, G. Haller, G. N. Ivey, P. F. Linden, E. Meiburg, N. Pinardi, N. M. Vriend, A. W. Woods
Summary: Environmental fluid mechanics is essential for addressing natural, industrial, and societal challenges. A workshop was organized to gather leading figures in the field and discuss five subject areas for the scientific community, aiming to provide a resource for future research.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Mechanics
Yohei Onuki, Sylvain Joubaud, Thierry Dauxois
Summary: A new technique was developed to assess internal wave-driven mixing in the ocean through direct numerical simulations of stratified turbulence. The study found that the external wave can directly supply energy for turbulence and mixing, and the mixing coefficient tends to increase with the Fr number of the external wave. Disturbances in the model go through two stages, converting wave energy into turbulence energy and eventually dissipating it.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
S. Boury, I. Sibgatullin, E. Ermanyuk, N. Shmakova, P. Odier, S. Joubaud, L. R. M. Maas, T. Dauxois
Summary: This study investigates the nonlinear dynamics of an inertial wave attractor in an axisymmetric geometrical setting both experimentally and numerically. The results show the development of a slow two-dimensional manifold and various dynamic regimes, such as triadic resonance instability and inertial wave turbulence, confirming the experimental observation of a polygonal vortex cluster. The formation and long-term fate of these vortex clusters resulting from merging wave-like components of the vorticity field remain to be explored.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
B. R. Sutherland, Y. Ma, M. R. Flynn, D. Frank, P. F. Linden, D. Lemasquerier, M. Le Bars, C. Pacary, T. Jamin, T. Dauxois, S. Joubaud
Summary: Through laboratory experiments and numerical simulations, it was found that rotation does not directly affect buoyant plumes in a uniform density ambient fluid with a sufficiently large source Rossby number. However, on a time scale of half a rotation period, the plume becomes deflected and may even form tornadoes. The likelihood of tornado formation is higher in plumes with a 'lazy' nature, as it is a result of competing dynamics occurring on comparable time scales.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
Daniel Odens Mora, Eduardo Monsalve, Maxime Brunet, Thierry Dauxois, Pierre-Philippe Cortet
Summary: By theoretical analysis and numerical integration, we investigated the triadic resonance instability (TRI) of a plane inertial wave in a rotating fluid, showing that the maximum growth rate of the TRI is found for secondary waves that do not propagate in the same vertical plane as the primary wave. Experimental evidence confirms the three-dimensional nature of the TRI of a plane inertial wave, with wave vectors of secondary waves matching theoretical predictions based on the maximum growth rate criterion.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Physics, Fluids & Plasmas
Vazha Loladze, Thierry Dauxois, Ramaz Khomeriki, Stefano Ruffo
Article
Materials Science, Multidisciplinary
Sourav Biswas, Clemens B. Winkelmann, Herve Courtois, Thierry Dauxois, Hillol Biswas, Anjan K. Gupta
Proceedings Paper
Computer Science, Information Systems
Ilias Sibgatullin, Xu Xiulin, Evgeny Ermanuyk, Daniil Ryazanov, Kirill Vatutin
PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON GEOGRAPHICAL INFORMATION SYSTEMS THEORY, APPLICATIONS AND MANAGEMENT (GISTAM 2019)
(2019)
Review
Mechanics
I. N. Sibgatullin, E. V. Ermanyuk
JOURNAL OF APPLIED MECHANICS AND TECHNICAL PHYSICS
(2019)
Article
Mechanics
E. A. Mikhailov, I. N. Sibgatullin
MAGNETOHYDRODYNAMICS
(2019)