title: Turbulence-condensate interaction in two dimensions.
abstract: 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.
authors.affiliation: Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: H
authors.initials: H
authors.lastname: Xia
authors.forename: H
authors.initials: H
authors.lastname: Punzmann
authors.forename: G
authors.initials: G
authors.lastname: Falkovich
authors.forename: M G
authors.initials: MG
authors.lastname: Shats