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Autor:
Berhanu, M., Verhille, G., Boisson, J., Gallet, B., Gissinger, C., Fauve, S., Mordant, N, Pétrélis, F., Bourgoin, M., Odier, P., Pinton, J. -F, Plihon, N., Aumaître, S, Chiffaudel, A., Daviaud, F., Dubrulle, B., Pirat, C.
Publikováno v:
European Physical Journal B: Condensed Matter and Complex Systems, EDP Sciences: EPJ, 2010, 77, pp.459
The Von K{\'a}rm{\'a}n 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 t
Externí odkaz:
http://arxiv.org/abs/1504.03879
Autor:
ICTR, Arneodo, A., Benzi, R., Berg, J., Biferale, L., Bodenschatz, E., Busse, A., Calzavarini, E., Castaing, B., Cencini, M., Chevillard, L., Fisher, R. T., Grauer, R., Homann, H., Lamb, D., Lanotte, A. S., Leveque, E., Luethi, B., Mann, J., Mordant, N., Mueller, W. -C., Ott, S., Ouellette, N. T., Pinton, J. -F., Pope, S. B., Roux, S. G., Toschi, F., Xu, H., Yeung, P. K.
Publikováno v:
Phys. Rev. Lett. 100, 254504 (2008)
We present a collection of eight data sets, from state-of-the-art experiments and numerical simulations on turbulent velocity statistics along particle trajectories obtained in different flows with Reynolds numbers in the range $R_\lambda \in [120:74
Externí odkaz:
http://arxiv.org/abs/0802.3776
Publikováno v:
Physica D 237, 2084-2089 (2008)
We compare experimental data and numerical simulations for the dynamics of inertial particles with finite density in turbulence. In the experiment, bubbles and solid particles are optically tracked in a turbulent flow of water using an Extended Laser
Externí odkaz:
http://arxiv.org/abs/0710.3257
We review the results obtained by three successful fluid dynamo experiments and discuss what has been learnt from them about the effect of turbulence on the dynamo threshold and saturation. We then discuss several questions that are still open and pr
Externí odkaz:
http://arxiv.org/abs/0709.0234
Autor:
Ravelet, F., Volk, R., Chiffaudel, A., Daviaud, F., Dubrulle, B., Monchaux, R., Bourgoin, M., Odier, P., Pinton, J. -F., Berhanu, M., Fauve, S., Mordant, N., Petrelis, F.
We study the flow response to an externally imposed homogeneous magnetic field in a turbulent swirling flow of liquid sodium -- the VKS2 experiment in which magnetic Reynolds numbers Rm up to 50 are reached. Induction effects are larger than in the f
Externí odkaz:
http://arxiv.org/abs/0704.2565
Autor:
Monchaux, R., Berhanu, M., Bourgoin, M., Moulin, M., Odier, Ph., Pinton, J. -F., Volk, R., Fauve, S., Mordant, N., Petrelis, F., Chiffaudel, A., Daviaud, F., Dubrulle, B., Gasquet, C., Marie, L., Ravelet, F.
We report the observation of dynamo action in the VKS experiment, i.e., the generation of magnetic field by a strongly turbulent swirling flow of liquid sodium. Both mean and fluctuating parts of the field are studied. The dynamo threshold correspond
Externí odkaz:
http://arxiv.org/abs/physics/0701075
Autor:
Berhanu, M., Monchaux, R., Fauve, S., Mordant, N., Petrelis, F., Chiffaudel, A., Daviaud, F., Dubrulle, B., Marie, L., Ravelet, F., Bourgoin, M., Odier, Ph., Pinton, J. -F., Volk, R.
We report the first experimental observation of reversals of a dynamo field generated in a laboratory experiment based on a turbulent flow of liquid sodium. The magnetic field randomly switches between two symmetric solutions B and -B. We observe a h
Externí odkaz:
http://arxiv.org/abs/physics/0701076
Autor:
Volk, R., Ravelet, F., Monchaux, R., Berhanu, M., Chiffaudel, A., Daviaud, F., Odier, Ph., Pinton, J. F., Fauve, S., Mordant, N., Petrelis, F.
We study the effect of a turbulent flow of liquid sodium generated in the von K\'arm\'an geometry, on the localized field of a magnet placed close to the frontier of the flow. We observe that the field can be transported by the flow on distances larg
Externí odkaz:
http://arxiv.org/abs/physics/0603210
Publikováno v:
Physical Review Letters, 95, 064501 (2005).
We analyze the statistics of turbulent velocity fluctuations in the time domain. Three cases are computed numerically and compared: (i) the time traces of Lagrangian fluid particles in a (3D) turbulent flow (referred to as the "dynamic" case); (ii) t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507060