A5084499180- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Nonlinear Waves and Solitons
- Coastal and Marine Dynamics
- Healthcare Systems and Practices
- Nonlinear Photonic Systems
- Fluid Dynamics and Turbulent Flows
- Health, Medicine and Society
- Vacuum and Plasma Arcs
- Laser Design and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Underwater Acoustics Research
- Advanced Fiber Laser Technologies
- Aeolian processes and effects
- Computational Fluid Dynamics and Aerodynamics
- Retinal Diseases and Treatments
- Historical Influence and Diplomacy
- Aerodynamics and Acoustics in Jet Flows
- Advanced Thermodynamic Systems and Engines
- Quantum Electrodynamics and Casimir Effect
- Tropical and Extratropical Cyclones Research
- Historical Studies and Socio-cultural Analysis
- Chemical Synthesis and Analysis
- Chemical Synthesis and Reactions
- Statistical Mechanics and Entropy
Sorbonne Université
2017-2025
Institut Jean Le Rond d'Alembert
2020-2025
Centre National de la Recherche Scientifique
2017-2024
Nantes Université
2023
Propagation des Ondes : Étude Mathématique et Simulation
2020-2022
Laboratoire Vision Action Cognition
2021
Laboratoire des Sciences du Numérique de Nantes
2019-2020
Centre Ophtalmologique d'Imagerie et de Laser
2020
Centre Hospitalier Universitaire de Nantes
2020
Laboratoire de Physique de l'ENS
2016-2019
Soliton gases represent large random soliton ensembles in physical systems that exhibit integrable dynamics at the leading order. Despite significant theoretical developments and observational evidence of ubiquity fluids optical media, their controlled experimental realization has been missing. We report a synthesis dense gas deep-water surface gravity waves using tools nonlinear spectral theory [inverse scattering transform (IST)] for one-dimensional focusing Schr\"odinger equation. The is...
I present the dynamics of waves trapped in a one-dimensional cavity with single wall that can move as result radiation pressure (and possibly other external forces). Specifically, classical wave equation is considered and phenomenology this system outlined when moving boundary achieves large displacements velocities similar to one waves. Governing equations are derived context electromagnetism, spatial discretization conserves total energy proposed. address cases prescribed or critically...
Rayleigh-B\'enard convection is investigated with sulfur hexafluoride (${\mathrm{SF}}_{6}$) in the vicinity of its critical point. In supercritical domain, direct measurements heat flux $Q$ as a function temperature difference $\mathrm{\ensuremath{\Delta}}T$ are consistent usual scaling laws single-phase turbulent convection. Along liquid-vapor coexistence curve, fluxes dramatically enhanced by condensation and boiling. Optical performed to document size velocity bubbles. We report...
We experimentally study resonant interactions of oblique surface gravity waves in a large basin. Our results strongly extend previous experimental performed mainly for perpendicular or collinear wave trains. generate two crossing at an acute angle, while we control their frequency ratio, steepnesses and directions. These mother mutually interact give birth to whose properties (growth rate, response curve phase locking) are fully characterized. All our found good quantitative agreement with...
In this work, we realize the mathematically predicted universal mechanism of local emergence Peregrine solitons in water tank experiments, with a particular aim to control point soliton occurrence space-time by employing inverse scattering transform for synthesis initial data. Using approach, are able engineer localized wave packet prescribed solitonic and radiative content, evolving rogue at position from maker.
An experimental study reveals a new statistical regime for 1D propagation of deep-water gravity waves where coherent structures (solitons, extreme events) coexist with random waves. Such state is predicted theoretically by integrable turbulence but thus far had not been observed in this context.
We consider capillary wave turbulence at scales larger than the forcing one. At such scales, our measurements show that surface waves dynamics is one of a thermal equilibrium state in which effective temperature related to injected power. characterize this evolution with scaling law and report statistical properties large-scale elevation depending on temperature.
The propagation of random water waves is experimentally investigated in a 150-m-long flume. emergence high-amplitude localized structures by nonlinear self-focusing, which correlates to some statistical properties surface elevation, reported. A systematic study reveals what extent these are locally akin Peregrine solitons, famous prototype rogue waves.
To compare 1-year outcomes of eyes with diabetic macular edema (DME) treated in routine clinical practice based on the proportion visits where intravitreal VEGF inhibitor injections were delivered.
We investigate the reflection of gravity-capillary surface waves by a plane vertical barrier. The size meniscus is found to strongly affect reflection: energy reflected wave with pinned contact line around twice one corresponding fully developed meniscus. To perform these measurements, new experimental setup similar an acousto-optic modulator and offers simple way measure amplitude, frequency direction propagation waves.
A multiscale reduced description of turbulent free shear flows in the presence strong stabilizing density stratification is derived via asymptotic analysis Boussinesq equations simultaneous limits small Froude and large Reynolds numbers. The explicitly recognizes occurrence dynamics on disparate spatiotemporal scales, yielding simplified partial differential governing coupled evolution slow large-scale hydrostatic fast small-scale isotropic instabilities internal waves. captured by...
We present a review of several experimental results that concern the problem hydrodynamic instabilities occurring in turbulent flows. The first experiment is related to generation magnetic field by flow liquid sodium, i.e. dynamo effect. show how bifurcation regime affected fluctuations. Above threshold, we study reversal dynamics and model showing respective contributions deterministic stochastic aspects. second nearly two-dimensional forced confined domain. sequence bifurcations involve...
We report on the observation of surface gravity-wave turbulence at scales larger than forcing ones in a large basin. In addition to downscale transfer usually reported turbulence, an upscale is observed, interpreted as inverse cascade weak theory. A steady state achieved when reaches scale between wavelength and basin size, but far from latter. This saturation, which depends wave steepness, probably due emergence nonlinear dissipative structures such sharp-crested waves.
We report the experimental study of bifurcations a large-scale circulation that is formed over turbulent flow generated by spatially periodic forcing. After shortly describing how becomes through sequence symmetry breaking bifurcations, we focus our on transitions occur within regime. They are related to changes in shape probability density function (PDF) amplitude large scale flow. discuss nature these and model PDF.
We describe in this paper the synthesis of compound 1 (R116301), which was developed to prepare pilot scale quantities (20–50 kg) drug substance. The involves sBuLi deprotonation Boc-protected piperidone acetal 2, followed by benzaldehyde addition and ring closure cyclic carbamate 4. Piperidine 5 is resolved with Brown's acid acylated. ketone obtained after piperidine deprotection undergoes reductive amination N-benzyl piperazine, most critical step synthesis. After debenzylation, final...
For the Swiss F/A-18 Aircraft, Boeing Company performed an Aircraft Structural Integrity Study (ASIP) to analyze structural integrity of entire airframe based on design spectrum. To validate this study a full scale fatigue test was carried out at RUAG. By setting up facility and preparing loads using data from Original Equipment manufacturer (OEM) RUAG met some difficulties due sparse documentation. This situation pushes search for methods generate aerodynamic its own. As result large...
Experiments are performed in a large basin to investigate nonlinear gravity waves generated by periodic or slowly modulated forcing. High-frequency self-similar spectra ascribed bound reported, which share similarities with the ones observed previous experiments of wave turbulence.
The fluctuation theorem characterizes the distribution of dissipation in nonequilibrium systems and proves that average will be positive. For a large system with no external source fluctuation, fluctuations properties become unobservable details are unable to explored. In this Letter, we consider such situation show how can obtained for small open subsystem within system. We find correction term has added due correlation surroundings. Its analytic expression derived provided some general...
The Benjamin-Feir, or modulational, instability has been regarded as the main mechanism of spontaneous disintegration broad weakly nonlinear wavepackets in deep water waves. We report wave experiments with another result. For a range initial parameters, nearly rectangular wavepacket develops strongly modulation two dispersive shock waves expanding from edges towards center at finite speed. This is supported by theory based on semiclassical limit one-dimensional focusing Schrodinger equation.
While at least four plane surface gravity waves are required to make a resonant interaction, only three modes in cylindrical container. An experiment is carried out isolate and characterize such triad interaction.
We investigate the statistics of rogue waves occurring in inverse cascade surface gravity wave turbulence. In such statistically homogeneous, stationary and isotropic fields, low-frequency are generated by nonlinear interactions rather than directly forced a maker. This provides laboratory realization arguably simplest sea state, which long-time acquisitions performed compared with theoretical models. The analysis thousands reveals that some their properties crucially depend on four-wave...
The interaction of an acoustic wave with a stratified fluid can drive strong streaming flows owing to the baroclinic production fluctuating vorticity, as recently demonstrated by Chini et al. ( J. Fluid Mech. , 744 2014, pp. 329–351). In present investigation, set wave/mean-flow equations is derived that governs coupled dynamics standing acoustic-wave mode characteristic (small) amplitude $\unicode[STIX]{x1D716}$ and flow it drives in thin channel walls maintained at differing temperatures....
This article illustrates the application of multiple scales analysis to two archetypal quasi-linear systems; i.e. systems involving fast dynamical modes, called fluctuations, that are not directly influenced by fluctuation–fluctuation nonlinearities but nevertheless strongly coupled a slow variable whose evolution may be fully nonlinear. In first case, waves drive slow, spatially inhomogeneous their celerity field. Multiple confirms that, although energy E , angular frequency ω and modal...
To cool off, don't turn on the fan; stereo! Acoustically enhanced heat transfer currently relies traveling waves, but recent theoretical work suggest that stationary waves in such inhomogeneous media would generate more intense streaming flows. This experiment reports additional flux achieved by forcing first acoustic mode a cavity filled with stably stratified air. Significant cooling is observed, especially as top-to-bottom temperature difference increased. effect could be used to remote...
Abstract We investigate numerically and experimentally the concept of nonlinear dispersion relation (NDR) in context partially coherent waves propagating a one-dimensional water tank. The random have narrow-bandwidth Fourier spectrum are described at leading order by Schrödinger equation. problem is considered framework integrable turbulence which solitons play key role. By using limited number wave gauges, we accurately measure NDR slowly varying envelope deep-water waves. This enables...