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Mixing and transport in turbulent flows-which have strong local concentration fluctuations-are essential in many natural and industrial systems including reactions in chemical mixers, combustion in engines and burners, droplet formation in warm clouds, and biological odor detection and chemotaxis. Local concentration fluctuations, in turn, are intimately… (More)

- E. CALZAVARINI, F. TOSCHI, E. Calzavarini, R. Volk, M. Bourgoin, E. Lévêque +2 others
- 2008

The dynamics of particles in turbulence when the particle size is larger than the dissipative scale of the carrier flow are studied. Recent experiments have highlighted signatures of particles' finiteness on their statistical properties, namely a decrease of their acceleration variance, an increase of correlation times (at increasing the particles size) and… (More)

- M. Berhanu, G. Verhille, J. Boisson, B. Gallet, C. Gissinger, S. Fauve +11 others
- 2010

The Von Kármán Sodium experiment yields a variety of dynamo regimes, when asymmetry is imparted to the flow by rotating impellers at different speed F1 and F2. We show that as the intensity of forcing, measured as F1 + F2, is increased, the transition to a self-sustained magnetic field is always observed via a supercritical bifurcation to a stationary… (More)

We report measurements of the spreading rate of pairs of tracer particles in an intensely turbulent laboratory water flow. We compare our measurements of this turbulent relative dispersion with the longstanding work of Richardson and Batchelor, and find excellent agreement with Batchelor's predictions. The distance neighbour function, the probability… (More)

We report measurements of the Lagrangian velocity structure functions of orders 1 through 10 in a high Reynolds number (Taylor microscale Reynolds numbers of up to R(lambda) = 815 ) turbulence experiment. Passive tracer particles are tracked optically in three dimensions and in time, and velocities are calculated from the particle tracks. The structure… (More)

- Nauman M. Qureshi, Unai Arrieta, Christophe Baudet, Alain Cartellier, Yves Gagne, Mickaël Bourgoin
- 2010

Turbulent transport of material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles transported by a turbulent carrier flow, remains a challenge. One critical and difficult point is to develop models which correctly describe the dynamics of particles… (More)

We report measurements of the second-order Lagrangian structure function and the Lagrangian velocity spectrum in an intensely turbulent laboratory flow. We find that the asymmetries of the large-scale flow are reflected in the small-scale statistics. In addition, we present new measurements of the Lagrangian structure function scaling constant C 0 , which… (More)

We present an apparatus that generates statistically homogeneous and isotropic turbulence with a mean flow that is less than 10% of the fluctuating velocity in a volume of the size of the integral length scale. The apparatus is shaped as an icosahedron where at each of the 12 vertices the flow is driven by independently controlled propellers. By adjusting… (More)

- Christophe Baudet, Mickaël Bourgoin, Muhammad Nauman Qureshi, Mr, Yves Gagne, Warhaft Zellman +15 others
- 2009

Acknowledgements First of all I thank God, the Almighty, for blessing me with courage, patience, perseverance, and all one needs to accomplish a doctoral dissertation. At this moment in time, when I look back, I see a long list of people who helped me achieve this important milestone in my life and to those I feel obliged to express my gratitude. The first… (More)

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