Fluid Mechanics and Acoustics Laboratory - UMR 5509

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


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Home > Teams > Turbulence & Instabilities > Publications T&I > Publications T&I 2014

Publications T&I 2014

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On the anisotropy of the turbulent passive scalar in the presence of a mean scalar gradient

Article in J. Fluid Mech. (2014)

On the anisotropy of the turbulent passive scalar in the presence of a mean scalar gradient

Wouter J. T. Bos

We investigate the origin of the scalar gradient skewness in isotropic turbulence on which a mean scalar gradient is imposed. The problem of the advection of an anisotropic scalar field is (...)

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Cross-helicity in Rotating Homogeneous Shear-Stratified Turbulence

Article in 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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The temperature spectrum generated by frictional heating in isotropic turbulence

Article in J. Fluid Mech. (2014)

The temperature spectrum generated by frictional heating in isotropic turbulence

Wouter J. T. Bos

In every turbulent flow with non-zero viscosity, heat is generated by viscous friction. This heat is then mixed by the velocity field. We consider how heat fluctuations generated in this way are (...)

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Petascale direct numerical simulation : DNS of boundary layer transition in channel flows

Article in PRACE Newsletter (2014)

Petascale direct numerical simulation : DNS of boundary layer transition in channel flows

Marc Buffat, Anne Cadiou & Lionel Le Penven

Understanding the mechanisms involved in the turbulent transition of boundary layers is crucial for many engineering domains. They are mainly studied by analytical theories supplemented by direct (...)

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Aerodynamics of buoyant releases within a longitudinally ventilated tunnel

Article in Exp. Therm. Fluid Sci. (2014)

Aerodynamics of buoyant releases within a longitudinally ventilated tunnel

J. Le Clanche, P. Salizzoni, M. Creyssels, R. Mehaddi, F. Candelier & O.Vauquelin

The dynamics of a positively buoyant release in a cross-flow within a rectangular channel are investigated. In particularly, we focus on the effects that determine the so-called ‘critical (...)

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Effective viscosity in quantum turbulence: A steady-state approach

Article in Europhys. Lett. (2014)

Effective viscosity in quantum turbulence: A steady-state approach

Simone Babuin, Emil Varga, Ladislav Skrbek, Emmanuel Lévêque & Philippe-E. Roche

The concept of "effective viscosity" $\nu_\mathrmeff$ of superfluid helium, widely used to interpret decaying turbulence, is tested in the steady-state case. We deduce $\nu_\mathrmeff$ from (...)

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Prevalence of the sling effect for enhancing collision rates in turbulent suspensions

Article in J. Fluid Mech. (2014)

Prevalence of the sling effect for enhancing collision rates in turbulent suspensions

Michel Voßkuhle, Alain Pumir, Emmanuel Lévêque & Michael Wilkinson

Turbulence facilitates collisions between particles suspended in a turbulent flow. Two effects have been proposed that can enhance the collision rate at high turbulence intensities: ‘preferential (...)

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Simulation of confined magnetohydrodynamic flows with Dirichlet boundary conditions using a pseudo-spectral method with volume penalization

Article in J. Comput. Phys. (2014)

Simulation of confined magnetohydrodynamic flows with Dirichlet boundary conditions using a pseudo-spectral method with volume penalization

Jorge A.Morales, Matthieu Leroy, Wouter J. T. Bos & Kai Schneider

A volume penalization approach to simulate magnetohydrodynamic (MHD) flows in confined domains is presented. Here the incompressible visco-resistive MHD equations are solved using parallel (...)

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Observation Model Based on Scale Interactions for Optical Flow Estimation

Article in IEEE Trans. Image Process. (2014)

Observation Model Based on Scale Interactions for Optical Flow Estimation

Pascal Zille, Thomas Corpetti, Liang Shao & Xu Chen

In this paper, an original observation model for multiresolution optical flow estimation is introduced. Multiresolution frameworks, often based on coarse-to-fine warping strategies, are widely (...)

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Linear instability, nonlinear instability and ligament dynamics in three-dimensional laminar two-layer liquid–liquid flows

Article in J. Fluid Mech. (2014)

Linear instability, nonlinear instability and ligament dynamics in three-dimensional laminar two-layer liquid–liquid flows

Lennon Ó Náraigh, Prashant Valluri, David M. Scott, Iain Bethune & Peter D. M. Spelt

We consider the linear and nonlinear stability of two-phase density-matched but viscosity-contrasted fluids subject to laminar Poiseuille flow in a channel, paying particular attention to the (...)

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