Volume 32, October 2011CEMRACS'10 research achievements: Numerical modeling of fusion
|231 - 241
|03 November 2011
LMD–CNRS, ENS, 24 rue Lhomond, 75231
Paris Cedex, France
2 M2P2–CNRS & CMI Universités d’Aix–Marseille, France
3 Département de Mathématiques, Université de Cergy, France
The Lagrangian statistics in rotating Saint-Venant turbulence are studied by means of direct numerical simulation using a pseudo-spectral discretization fully resolving, both in time and space, all the inertio-gravity waves present in the system. To understand the influence of waves, three initial conditions are considered, one which is dominated by waves, one which is dominated by vortices, and one which is intermediate between these two extreme cases. It is found that Lagrangian acceleration is strongly influenced by the presence of waves, as are the Lagrangian velocity increments, for incremements that are sufficiently short, and that vortex motion influences mostly the component of Lagrangian acceleration which is perpendicular to the local velocity.
The authors thank the CIRM Marseille for its hospitality and for financial support during the CEMRACS 2010 Summer Program where part of the work was carried out, and IDRIS-CNRS for providing computing facilities.
VK would like to thank the French embassy in India for financial support of his visit in ENS Paris, and EGIDE for all kind of help.
RNVY, MF and KS are thankful to the Association CEA-EURATOM and to the French Research Federation for Fusion Studies for supporting their work within the framework of the European Fusion Development Agreement and the French Research Federation for Fusion Studies under the contract V.3258.001. This work is supported by the European Communities under the contract of Association between Euratom and CEA. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
© EDP Sciences, SAIM 2011
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