Charney isotropy and equipartition in quasi-geostrophic turbulence
2010 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 656, 448-457 p.Article in journal (Refereed) Published
High-resolution simulations of forced quasi-geostrophic (QG) turbulence reveal that Charney isotropy develops under a wide range of conditions, and constitutes a preferred state also in beta-plane and freely decaying turbulence. There is a clear analogy between two-dimensional and QG turbulence, with a direct enstrophy cascade that is governed by the prediction of Kraichnan (J. Fluid Mech., vol. 47, 1971, p. 525) and an inverse energy cascade following the classic k(-5/3) scaling. Furthermore, we find that Charney's prediction of equipartition between the potential and kinetic energy in each of the two horizontal velocity components is approximately fulfilled in the inertial ranges.
Place, publisher, year, edition, pages
2010. Vol. 656, 448-457 p.
rotating turbulence, turbulence simulation, turbulence theory
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-25763DOI: 10.1017/S0022112010002703ISI: 000280868600021ScopusID: 2-s2.0-77957156534OAI: oai:DiVA.org:kth-25763DiVA: diva2:359723
QC 201010292010-10-292010-10-292010-10-29Bibliographically approved