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 > Research activities > Turbulence and modelisation

Passive scalar

Passive scalar

Nous réunissons ici quelques travaux sur le mélange pour lesquels le scalaire est passif (donc sa vitesse est égale à celle du fluide, avec un éventuel déplacement supplémentaire dû à la diffusion); le scalaire peut être la température. Les travaux concernant les particules de taille finie sont à retrouver sur la page "Transport de particules".


Staff implied: Wouter Bos
Collaborations: Robert Rubinstein, Le Fang, Benjamin Kadoch, Kai Schneider


Associated publications:

Efficiency of laminar and turbulent mixing in wall-bounded flows

Article in Phys. Rev. E (2020)

Efficiency of laminar and turbulent mixing in wall-bounded flows

Benjamin Kadoch, Wouter Bos & Kai Schneider

A turbulent flow mixes in general more rapidly a passive scalar than a laminar flow does. From an energetic point of view, for statistically homogeneous or periodic flows, the laminar regime is (...)

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Passive scalar mixing in modulated turbulence

Article in Fluid Dyn. Res. (2019)

Passive scalar mixing in modulated turbulence

Yuyao Yang, Robert Chahine, Robert Rubinstein & Wouter JT Bos

We investigate the mixing of a passive scalar in an isotropic turbulent flow in the presence of a time-periodic forcing. The results corroborate recent analytical predictions on the frequency (...)

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Directional change of fluid particles in two-dimensional turbulence and of football players

Article in Phys. Rev. Fluids (2017)

Directional change of fluid particles in two-dimensional turbulence and of football players

Benjamin Kadoch, Wouter J. T. Bos, and Kai Schneider

Multiscale directional statistics are investigated in two-dimensional incompressible turbulence. It is shown that the short-time behavior of the mean angle of directional change of fluid (...)

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Mixing in modulated turbulence. Analytical results

Article in Comput. Fluids (2017)

Mixing in modulated turbulence. Analytical results

Wouter J.T. Bos, Robert Rubinstein

Recent numerical results show that if a scalar is mixed by periodically forced turbulence, the average mixing rate is directly affected for forcing frequencies small compared to the integral (...)

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Spectral modelling for passive scalar dynamics in homogeneous anisotropic turbulence

Article in J. Fluid Mech. (2016)

Spectral modelling for passive scalar dynamics in homogeneous anisotropic turbulence

Antoine Briard, Thomas Gomez & Claude Cambon

The present work aims at developing a spectral model for a passive scalar field and its associated scalar flux in homogeneous anisotropic turbulence. This is achieved using the paradigm of (...)

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On the scaling of temperature fluctuations induced by frictional heating

Article in Phys. Fluids (2015)

On the scaling of temperature fluctuations induced by frictional heating

Wouter J. T. Bos, Robert Chahine & Andrey V. Pushkarev

The temperature fluctuations generated by viscous dissipation in an isotropic turbulent flow are studied using direct numerical simulation. It is shown that their scaling with Reynolds number is (...)

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Angular statistics of Lagrangian trajectories in turbulence

Article in Phys. Rev. letters (2015)

Angular statistics of Lagrangian trajectories in turbulence

Wouter J. T. Bos, Benjamin Kadoch & Kai Schneider

The angle between subsequent particle displacement increments is evaluated as a function of the time lag in isotropic turbulence. It is shown that the evolution of this angle contains two (...)

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Dependence of turbulent advection on the Lagrangian correlation time

Article in Phys. Rev. E (2015)

Dependence of turbulent advection on the Lagrangian correlation time

Wouter J. T. Bos & Le Fang

In turbulent scalar mixing, starting from random initial conditions, the root-mean-square advection term rapidly drops as the flow and the scalar field organize. We show first analytically, for (...)

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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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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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