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arXiv 1003.2780physics.flu-dyn
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定常状态下的非平衡系统:开阔海洋中的风浪

A non-equilibrium system in a steady state: wind waves in the open ocean

Yves Pomeau Yves, Martine Le Berre

摘要:

我们推导出风激发波的稳定谱的标度律,假设两种无粘性流体(空气和水)和无表面张力,在大的速度有效的近似。在这个极限中,存在唯一的(小的)无量纲参数$ε$,即空气和水这两种流体的质量密度之比,与风速无关。$ε$的小允许导出波系统的一些重要的平均性质。波的平均平方斜率为$|ln (ε^2)|^{-1}$阶,这是一个很小但不是很小的量。这支持了在波-波相互作用中经常使用的小非线性假设。我们引入一个方程来满足两点相关的高度波动。

英文摘要:

We derive scaling laws for the steady spectrum of wind excited waves, assuming two inviscid fluids (air and water) and no surface tension, an approximation valid at large speeds. In this limit there exists an unique (small) dimensionless parameter $ε$, the ratio of the mass densities of the two fluids, air and water, independently of the wind speed. The smallness of $ε$ allows to derive some important average properties of the wave system. The average square slope of the waves is of order $|ln (ε^2)|^{-1}$, a small but not very small quantity. This supports the often used assumption of small nonlinearity in the wave-wave interaction. We introduce an equation to be satisfied by the two-point correlation of the height fluctuations.

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