arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.09267physics.flu-dynnlin.CDphysics.ao-phphysics.plasm-ph
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具有热力学和几何学的扩展浅水理论

Extended shallow-water theories with thermodynamics and geometry

F. J. Beron-Vera

摘要:

在二维地球物理流动模式中,动量增长驱动下,本文介绍了一个通用的“热”旋转浅水模式族。该模型能够容纳热力学过程,如那些在海洋混合层中的作用,通过允许浮力在水平位置和时间以及深度变化,在一个多项式的方式到任意程度。此外,该模型承认欧拉-庞加莱变分公式,并具有李-泊松哈密顿结构。这样的几何性质提供了坚实的基本支持的理论描述的数值实现和未解决的运动参数化的建设的后果。特别是,它被发现,分层停止最近在一个流行的模型,其中,具有垂直均匀的密度,代表了一个特殊的情况下,这里提出的模型中观察到的小规模的长丝卷缩的发展。

英文摘要:

Driven by growing momentum in two-dimensional geophysical flow modeling, this paper introduces a general family of "thermal" rotating shallow-water models. The models are capable of accommodating thermodynamic processes, such as those acting in the ocean mixed layer, by allowing buoyancy to vary in horizontal position and time as well as with depth, in a polynomial fashion up to an arbitrary degree. Moreover, the models admit Euler--Poincare variational formulations and possess Lie--Poisson Hamiltonian structure. Such a geometric property provides solid fundamental support to the theories described with consequences for numerical implementation and the construction of unresolved motion parametrizations. In particular, it is found that stratification halts the development of small-scale filament rollups recently observed in a popular model, which, having vertically homogeneous density, represents a special case of the models presented here.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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