Phys. Rev. Lett. 101, 194504 (2008) [4 pages]Turbulence-Condensate Interaction in Two DimensionsReceived 4 May 2008; published 6 November 2008 We present experimental results on turbulence generated in thin fluid layers in the presence of a large-scale coherent flow, or a spectral condensate. It is shown that the condensate modifies the third-order velocity moment in a much wider interval of scales than the second one. The modification may include the change of sign of the third moment in the inverse cascade. This observation may help resolve a controversy on the energy flux in mesoscale atmospheric turbulence (10–500 km): to recover a correct energy flux from the third velocity moment one needs first to subtract the coherent flow. We find that the condensate also increases the velocity flatness. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.194504
DOI:
10.1103/PhysRevLett.101.194504
PACS:
47.27.Rc, 42.68.Bz, 47.55.Hd
See AlsoComment: Erik Lindborg, Comment on “Turbulence-Condensate Interaction in Two Dimensions”, Phys. Rev. Lett. 102, 149401 (2009). Reply: H. Xia, M. G. Shats, H. Punzmann, and G. Falkovich, Xia et al. Reply:, Phys. Rev. Lett. 102, 149402 (2009). |
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