Turbulence-condensate interaction in two dimensions

Details Turbulence-condensate interaction in two dimensions Turbulence-condensate interaction in two dimensions

2008-06-19

arxiv.org/abs/0806.3116v2

Physical Review Letters, 101, 194504 (2008)

Physics

Fluid Dynamics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.194504

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.

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