arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.09375physics.flu-dyncond-mat.softnlin.PS
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具有垂直奇粘度的非线性浅水波

Nonlinear shallow-water waves with vertical odd viscosity

Alex Doak, Guido Baardink, Paul A Milewski, Anton Souslov

AI总结:

研究具有垂直奇粘度的三维流体中的非线性浅水波,发现奇粘性引发新的非线性效应,推导出修正的 KdV、Ostrovsky 和 KP 方程,并揭示大奇粘性下二维紧致孤波的形成。

摘要:

流体中通过 Coriolis 力或奇粘性应力破坏细致平衡,对表面波动力学具有深远影响。在此,我们探讨了具有垂直奇粘度的三维流体中,在有和没有 Coriolis 效应情况下的弱非线性与强非线性波。我们的模型描述了由几乎垂直的涡旋丝组成的浅流体的自由表面,这些涡旋丝均垂直于表面。我们发现,这种构型中的奇粘性在浅水波中引发了此前未被探索的非线性效应,这些效应源于表面应力与体相中的应力梯度。通过假设弱非线性,我们推导出了包含修正系数的 Korteweg-de Vries (KdV)、Ostrovsky 和 Kadomtsev-Petviashvilli (KP) 方程。在足够大的奇粘性下,色散改变符号,从而允许紧致的二维孤波存在。我们表明,奇粘性与表面张力对自由表面具有相同的作用,但在流体流动中具有截然不同的特征。我们的结果描述了多涡旋系统的集体动力学,这同样可能发生于海洋与大气地球物理学中。

英文摘要:

The breaking of detailed balance in fluids through Coriolis forces or odd-viscous stresses has profound effects on the dynamics of surface waves. Here we explore both weakly and strongly non-linear waves in a three-dimensional fluid with vertical odd viscosity with and without the Coriolis effect. Our model describes the free surface of a shallow fluid composed of nearly vertical vortex filaments, which all stand perpendicular to the surface. We find that the odd viscosity in this configuration induces previously unexplored non-linear effects in shallow-water waves, arising from both stresses on the surface and stress gradients in the bulk. By assuming weak nonlinearity, we find reduced equations including Korteweg-de Vries (KdV), Ostrovsky, and Kadomtsev-Petviashvilli (KP) equations with modified coefficients. At sufficiently large odd viscosity, the dispersion changes sign, allowing for compact two-dimensional solitary waves. We show that odd viscosity and surface tension have the same effect on the free surface, but distinct signatures in the fluid flow. Our results describe the collective dynamics of many-vortex systems, which can also occur in oceanic and atmospheric geophysics.

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