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arXiv 2009.04017math.AP
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带旋转项的无粘原方程在索伯列夫空间中的时空爆破与不适定性

Finite-time Blowup and Ill-posedness in Sobolev Spaces of the Inviscid Primitive Equations with Rotation

Slim Ibrahim, Quyuan Lin, Edriss S. Titi

摘要:

海洋和大气的大尺度动力学是由原始方程组(PE)控制的。众所周知,三维粘性运动方程在索伯列夫空间中是整体适定的。另一方面,无旋转的无粘弹性方程在索伯列夫空间中是不适定的,其光滑解在有限时间内可以形成奇异性。在本文中,我们推广了上述结果在旋转的存在。首先,我们构造了带旋转的无粘粒子群的有限时间爆破解,并证明了带旋转的无粘粒子群在索伯列夫空间中是不适定的,因为它在索伯列夫空间中围绕定常背景流的扰动是线性和非线性的。它的线性不稳定性是Kelvin-Helmholtz型,类似于涡面问题中出现的线性不稳定性。这意味着无粘PE在$s > 1$阶的Gevrey类中也是线性不适定的,并表明适定性的空间是$s = 1$阶的Gevrey类,它正好是解析函数的空间.

英文摘要:

Large scale dynamics of the oceans and the atmosphere are governed by the primitive equations (PEs). It is well-known that the three-dimensional viscous PEs is globally well-posed in Sobolev spaces. On the other hand, the inviscid PEs without rotation is known to be ill-posed in Sobolev spaces, and its smooth solutions can form singularity in finite time. In this paper, we extend the above results in the presence of rotation. First, we construct finite-time blowup solutions to the inviscid PEs with rotation, and establish that the inviscid PEs with rotation is ill-posed in Sobolev spaces in the sense that its perturbation around a certain steady state background flow is both linearly and nonlinearly ill-posed in Sobolev spaces. Its linear instability is of the Kelvin-Helmholtz type similar to the one appears in the context of vortex sheets problem. This implies that the inviscid PEs is also linearly ill-posed in Gevrey class of order $s > 1$, and suggests that a suitable space for the well-posedness is Gevrey class of order $s = 1$, which is exactly the space of analytic functions.

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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