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| HAL : hal-00512486, version 1 |
| DOI : 10.1016/j.physd.2009.12.008 |
| Fiche détaillée |  Récupérer au format |
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| Physica D: Nonlinear Phenomena 239 (2010) 1269 |
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| Lagrangian dynamics of drift-wave turbulence |
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| Wouter J.T. Bos 1Benjamin Kadoch 2 |
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| (2010) |
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| The statistical properties of Lagrangian particle transport are investigated in dissipative drift-wave turbulence modelled by the Hasegawa–Wakatani system. By varying the adiabaticity parameter c, the flow regime can be modified from a hydrodynamic limit for c=0 to a geostrophic limit for c→∞. For c of order unity the quasi-adiabatic regime is obtained, which might be relevant to describe the edge turbulence of fusion plasmas in tokamaks. This particularity of the model allows one to study the change in dynamics when varying from one turbulent flow regime to another. By means of direct numerical simulation we consider four values for c and show that the Lagrangian dynamics is most intermittent in the hydrodynamic regime, while the other regimes are not or only weakly intermittent. In both quasi-adiabatic and quasi-geostrophic regimes the PDFs of acceleration exhibit exponential tails. This behaviour is due to the pressure term in the acceleration and not a signature of intermittency. |
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| 1 : | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) |
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CNRS : UMR5509 – Université Claude Bernard - Lyon I – Ecole Centrale de Lyon – Institut National des Sciences Appliquées de Lyon |
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| 2 : | Mécanique Modélisation et Procédés Propres (M2P2) |
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CNRS : UMR6181 – Université de la Méditerranée - Aix-Marseille II – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III – Ecole Centrale de Marseille |
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| Domaine | : | Physique/Mécanique/Mécanique des fluides Sciences de l'ingénieur/Mécanique/Mécanique des fluides |
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| Intermittency – Lagrangian dynamics – Drift-wave turbulence – Direct numerical simulation |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00512486, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00512486 | |
| oai:hal.archives-ouvertes.fr:hal-00512486 | |
| Contributeur : Wouter Bos | |
| Soumis le : Lundi 30 Août 2010, 16:36:43 | |
| Dernière modification le : Lundi 30 Août 2010, 17:09:11 | |
