A further experiment on two-dimensional decaying turbulence on a rotating sphere
A further experiment on two-dimensional decaying turbulence on a rotating sphere
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旋转球体上二维衰减湍流的进一步实验
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. Yamada
中科院分区：
文献类型：
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作者：
S. Yoden;K. Ishioka;Y. Hayashi;M. Yamada
采用高分辨率谱模式，对旋转球上无辐散正压流体的二维衰减湍流进行了一系列数值试验。能谱和流场的时间变化高度依赖于旋转速率。在非旋转情况下，孤立的相干涡出现在时间的发展过程中，在平面二维湍流。但随着自转速率的增大，流场的演变发生剧烈变化，高纬度地区出现向西的绕极涡旋，中、低纬度地区出现纬向带状结构。这些功能上的初始能谱的依赖关系进行了研究，并讨论了这种模式的形成的动力学。
A series of numerical experiments on the two-dimensional decaying turbulence is performed for a non-divergent barotropic fluid on a rotating sphere by using a high-resolution spectral model. Time variations of the energy spectrum and the flow field are highly dependent on the rotation rate. In non-rotational cases, isolated coherent vortices emerge in the course of time development as in the planar two-dimensional turbulence. As the rotation rate increases, however, the evolution of the flow field changes drastically, and a westward circumpolar vortex appears in high-latitudes as well as zonal band structures in mid- and low-latitudes. The dependence of these features on the initial energy spectrum is investigated and the dynamics of such pattern formations is discussed.