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Noise rectification in quasigeostrophic forced turbulence

AuthorsÁlvarez-Díaz, Alberto ; Hernández-García, Emilio ; Tintoré, Joaquín
Issue Date1998
PublisherAmerican Physical Society
CitationPhysical Review E- Statistical, Nonlinear, and Soft Matter Physics 58: 7279-7282 (1998)
AbstractWe study the appearance of large-scale mean motion sustained by stochastic forcing on a rotating fluid (in the quasigeostrophic approximation) flowing over topography. We show that the effect is a kind of noise-rectification phenomenon, occurring here in a spatially extended system, and requiring nonlinearity, absence of detailed balance, and symmetry breaking to occur. By application of an analytical coarse-graining procedure, we identify the physical mechanism producing such an effect: It is a forcing coming from the small scales that manifests itself in a change in the effective viscosity operator and in the effective noise statistical properties. Numerical simulations confirm our findings.
Identifiersdoi: 10.1103/PhysRevE.58.7279
issn: 1063-651X
Appears in Collections:(IMEDEA) Artículos
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