The role of boundary conditions in the simulation of rotating, stratified turbulence
作者:
D.G. Dritschel,
C. Macaskill,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 2000)
卷期:
Volume 92,
issue 3-4
页码: 233-253
ISSN:0309-1929
年代: 2000
DOI:10.1080/03091920008203717
出版商: Taylor & Francis Group
关键词: Quasi-geostrophic turbulence;Boundary conditions;Contour dynamics;Potential vorticity
数据来源: Taylor
摘要:
In this paper we use the CASL method to explore the role of boundary conditions in determining the long-time behaviour of rotating, stratified, quasi-geostrophic turbulence. We find that initially two-dimensional (sufficiently tall) columns of potential vorticity (PV) break down through three-dimensional instability to give a fully three-dimensional flow consisting of ellipsoidal structures. This is the case both for rigid-lid (isothermal) vertical boundary conditions and for vertically periodic boundaries. However, the rigid boundary case gives rise to semi-ellipsoids at both the top and bottom boundaries, and, for sufficient domain depths, preferred depths for the formation of ellipsoids in the interior. By contrast, in the vertically periodic case, the distribution of ellipsoids is homogeneous in depth.
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