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arXiv 2603.07129physics.flu-dynphysics.geo-ph
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地形对非旋转浅层流稳态的影响

Topographic Effects on Steady-States of Non-Rotating Shallow Flows

Gran Sasso Science Institute(格兰萨索科学研究所);University of Twente(特温特大学)

Pierpaolo Bilotto, Roberto Verzicco

AI总结:

本文研究了非旋转浅层流在地形作用下的稳态行为,通过理论和数值方法分析了雷诺数对最终状态的影响,并揭示了湍流条件下吸引子的非唯一性及地形对涡旋分布的影响。

摘要:

在本工作中,我们讨论了非旋转准二维粘性流体在地形上长时间行为。我们开发了一个新的理论和数值框架,用于分析这些流体,该框架源于三维纳维-斯托克斯方程在罗斯比数趋于无穷大的极限下的维度约简。我们通过数值方法确定了固定动能下的动力吸引子,重点研究了最终状态对雷诺数的依赖性。在湍流条件下,吸引子不再唯一,而是被分散,覆盖确定性系统的最低激发态。无论最终的稳定配置如何,大尺度涡旋都会在地形峡谷中沉降,这与旋转情况下的现象不同。这些发现对理解缓慢旋转(Ro >> 1)行星环境中稳定湍流状态具有重要意义。

英文摘要:

In this work, we discuss the long-time behavior of non-rotating quasi-2D viscous flows over topographies. We develop a novel theoretical and numerical framework for the analysis of these flows, derived as a dimensional reduction of the 3D Navier-Stokes equations in the limit of infinite Rossby number $\mathit{Ro}$. We numerically determine dynamical attractors for fixed kinetic energy, focusing on the dependence of the final state on the Reynolds number. Under turbulent conditions, the attractor is no longer unique but delocalized, spanning the lowest excited states of the deterministic system. Regardless of the realized stationary configuration, large-scale vortices settle within topographic valleys, in contrast with the phenomenology of the rotating case. These findings have significant implications for understanding steady turbulent regimes in slowly rotating ($\mathit{Ro} \gg 1$) planetary environments.

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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