Zobrazeno 1 - 10
of 272
pro vyhledávání: '"Petrelis, F."'
Autor:
Pétrélis, N., Pétrélis, F.
We consider the random deposition of objects of variable width and height over a line. The successive additions of these structures create a random interface. We focus on the regime of heavy tailed distributions of the structure width. When the struc
Externí odkaz:
http://arxiv.org/abs/2403.17991
We investigate the spatio-temporal quantity of coherence for turbulent velocity fluctuations at spatial distances of the order or larger than the integral length scale $l_{0}$. Using controlled laboratory experiments, an exponential decay as a functi
Externí odkaz:
http://arxiv.org/abs/2107.11855
Publikováno v:
Phys. Rev. Lett. 118, 144502 (2017)
We consider capillary wave turbulence at scales larger than the forcing one. At such scales, our measurements show that the surface waves dynamics is the one of a thermal equilibrium state in which the effective temperature is related to the injected
Externí odkaz:
http://arxiv.org/abs/1701.08109
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:
Pétrélis, F., Alexakis, A.
Critical exponents are calculated exactly at the onset of an instability, using asymptotic expansiontechniques. When the unstable mode is subject to multiplicative noise whose spectrum at zero frequency vanishes, we show that the critical behavior ca
Externí odkaz:
http://arxiv.org/abs/1112.0999
Autor:
Petrelis, F., Fauve, S.
We present a new mechanism for oscillatory or random reversals of the magnetic field that occur from a stationary dynamo state. The basic ingredient is the existence of two nearly critical dynamo eigenmodes, a stable and an unstable one, that collide
Externí odkaz:
http://arxiv.org/abs/0806.3937
We show that a model, recently used to describe all the dynamical regimes of the magnetic field generated by the dynamo effect in the VKS experiment [1], also provides a simple explanation of the reversals of Earth's magnetic field, despite strong di
Externí odkaz:
http://arxiv.org/abs/0806.3756
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