Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Accueil > Équipes > Turbulence & Instabilités > Thématiques > Écoulements pour la géophysique

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Supercritical dead water : effect of nonlinearity and comparison with observations

Article dans J. Fluid Mech. (2016)

Supercritical dead water : effect of nonlinearity and comparison with observations

John Grue, Daniel Bourgault, Peter S. Galbraith

Supercritical ship internal wave wakes with $Fr=U/c_0\sim4–12$ (where $U$ is the ship speed and $c_0$ is the linear internal long-wave speed) are calculated by a strongly nonlinear two-layer model (...)

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Inverse cascades and resonant triads in rotating and stratified turbulence

Article dans Phys. Fluids (2017)

Inverse cascades and resonant triads in rotating and stratified turbulence

D. Oks, P. D. Mininni, R. Marino, and A. Pouquet

Kraichnan’s seminal ideas on inverse cascades yielded new tools to study common phenomena in geophysical turbulent flows. In the atmosphere and the oceans, rotation and stratification result in a (...)

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Overview of and first observations from the TILDAE High-Altitude Balloon Mission

Article dans Atmos. Meas. Tech. (2017)

Overview of and first observations from the TILDAE High-Altitude Balloon Mission

Bennett A. Maruca, Raffaele Marino, David Sundkvist, Niharika H. Godbole, Stephane Constantin, Vincenzo Carbone, and Herb Zimmerman

Though the presence of intermittent turbulence in the stratosphere has been well established, much remains unknown about it. In situ observations of this phenomenon, which have provided the (...)

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On the Statistical Properties of Turbulent Energy Transfer Rate in the Inner Heliosphere

Article dans Solar Physics (2018)

On the Statistical Properties of Turbulent Energy Transfer Rate in the Inner Heliosphere

Luca Sorriso-Valvo, Francesco Carbone, Silvia Perri, Antonella Greco, Raffaele Marino & Roberto Bruno

The transfer of energy from large to small scales in solar wind turbulence is an important ingredient of the long-standing question of the mechanism of the interplanetary plasma heating. Previous (...)

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Settling and collision between small ice crystals in turbulent flows

Article dans Phys. Rev. Fluids (2018)

Settling and collision between small ice crystals in turbulent flows

Jennifer Jucha, Aurore Naso, Emmanuel Lévêque, and Alain Pumir

Ice crystals are present in a variety of clouds, at sufficiently low temperature. We consider here mixed-phase clouds which, at temperature ≳−20$^\circ$C, contain ice crystals, shaped approximately (...)

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Scaling laws for mixing and dissipation in unforced rotating stratified turbulence

Article dans J. Fluid Mech. (2018)

Scaling laws for mixing and dissipation in unforced rotating stratified turbulence

Annick Pouquet, Duane Rosenberg, Raffaele Marino and Corentin Herbert

We present a model for the scaling of mixing in weakly rotating stratified flows characterized by their Rossby, Froude and Reynolds numbers , $Ro$, $Fr$, $Re$. This model is based on (...)

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Vertical drafts and mixing in stratified turbulence : Sharp transition with Froude number

Article dans Europhys. Lett. (2018)

Vertical drafts and mixing in stratified turbulence : Sharp transition with Froude number

Fabio Feraco, Raffaele Marino, Alain Pumir, Leonardo Primavera, Pablo D. Mininni, Annick Pouquet & Duane Rosenberg

We investigate the large-scale intermittency of vertical velocity and temperature, and the mixing properties of stably stratified turbulent flows using both Lagrangian and Eulerian fields from (...)

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Characterizing turbulent overturns in CTD-data

Article dans Dyn. Atmos. Ocean. (2014)

Characterizing turbulent overturns in CTD-data

Hans van Haren & Louis Gostiaux

We are concerned with the shape of overturns due to irreversible effects of turbulent mixing through internal wave breaking in the ocean. Vertical $(z)$ overturn displacements $(d)$ are computed (...)

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Cross-helicity in Rotating Homogeneous Shear-Stratified Turbulence

Article dans Phys. Rev. letters (2014)

Cross-helicity in Rotating Homogeneous Shear-Stratified Turbulence

A. B. Pieri, F. S. Godeferd, C. Cambon, B. Dubrulle & S. Thalabard

We consider homogeneous shear-stratified turbulence in a rotating frame, that exhibits complex nonlinear dynamics. Since the analysis of relative orientation between coupled fluctuating fields (...)

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Extremely long Kelvin‐Helmholtz billow trains in the Romanche Fracture Zone

Article dans Geophys. Res. Lett. (2014)

Extremely long Kelvin‐Helmholtz billow trains in the Romanche Fracture Zone

Hans van Haren, Louis Gostiaux, Eugene Morozov & Roman Tarakanov

In the Atlantic Ocean, the densest water mass Antarctic Bottom Water “AABW” can only cross the Mid‐Atlantic Ridge from its southwestern to northeastern basins in limited, because deep, conduits. At (...)

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Comparison of Ellison and Thorpe scales from Eulerian ocean temperature observations

Article dans J. Geophys. Res. C (2014)

Comparison of Ellison and Thorpe scales from Eulerian ocean temperature observations

Andrea A. Cimatoribus, Hans van Haren & Louis Gostiaux

Ocean turbulence dissipation rate is estimated either by means of microstructure shear measurements, or by adiabatically reordering vertical profiles of density. The latter technique leads to the (...)

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Depletion of nonlinearity in two-dimensional turbulence

Article dans Phys. Fluids (2014)

Depletion of nonlinearity in two-dimensional turbulence

Andrey V. Pushkarev & Wouter J. T. Bos

The strength of the nonlinearity is measured in decaying two-dimensional turbulence, by comparing its value to that found in a Gaussian field. It is shown how the nonlinearity drops following a (...)

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Distinguishing turbulent overturns in high-sampling-rate moored thermistor string observations

Article dans J. Mar. Res. (2015)

Distinguishing turbulent overturns in high-sampling-rate moored thermistor string observations

Hans van Haren & Louis Gostiaux

Turbulent overturns are distinguished from salinity-compensated intrusions in high-resolution moored thermistor string observations. The buoyancy frequency N is used to make the time (...)

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Structure and dynamics of rotating turbulence : a review of recent experimental and numerical results

Article dans Appl. Mech. Rev. (2015)

Structure and dynamics of rotating turbulence : a review of recent experimental and numerical results

Fabien Godeferd & Frédéric Moisy

Rotating turbulence is a fundamental phenomenon appearing in several geophysical and industrial applications. Its study benefited from major advances in the recent years, but also raised new (...)

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Where large deep‐ocean waves break

Article dans Geophys. Res. Lett. (2015)

Where large deep‐ocean waves break

Hans van Haren, Andrea Cimatoribus & Louis Gostiaux

Underwater topography like seamounts causes the breaking of large “internal waves” with associated turbulent mixing strongly affecting the redistribution of sediment. Here ocean turbulence is (...)

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Generation of internal solitary waves by frontally forced intrusions in geophysical flows

Article dans Nature Communications (2016)

Generation of internal solitary waves by frontally forced intrusions in geophysical flows

Daniel Bourgault, Peter S. Galbraith, Cédric Chavanne

Internal solitary waves are hump-shaped, large-amplitude waves that are physically analogous to surface waves except that they propagate within the fluid, along density steps that typically (...)

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Convective mixing by internal waves in the Puerto Rico Trench

Article dans J. Mar. Res. (2016)

Convective mixing by internal waves in the Puerto Rico Trench

Hans van Haren & Louis Gostiaux

A 2.4 km long deep-sea mooring was deployed for 14 months in the Puerto Rico Trench, the deepest part of the Atlantic Ocean. Below its top buoyancy package, the mooring line held a 200 m long (...)

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