arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2209.02634math.AP
收藏

旋转分层流向准地转动力学的非收敛性

Non-convergence of the rotating stratified flows toward the quasi-geostrophic dynamics

Min Jun Jo, Junha Kim, Jihoon Lee

AI总结:

本文研究旋转分层 Boussinesq 流对 QG 动力学的近似,证明旋转—分层比为1或过慢趋于1时不收敛,并给出其他情形的收敛条件及速率下界。

摘要:

quasi-geostrophic(QG,准地转)方程一直被用于刻画强分层和快速旋转情形下旋转分层 Boussinesq 流的渐近动力学。本文证明,当旋转—分层比在渐近情形中固定为 1,或以足够慢的速度趋于 1 时,这种近似是无效的:旋转分层 Boussinesq 流与相应 QG 流之间的差异始终严格远离零,且与旋转和分层的强度无关。相比之下,我们还表明,当旋转—分层比固定为 1 以外的某个数,或足够快地收敛到 1 时,收敛会发生。作为推论,我们计算了收敛速率的一个下界;当旋转—分层比趋于 1 时,该下界会发散。

英文摘要:

The quasi-geostrohpic (QG) equation has been used to capture the asymptotic dynamics of the rotating stratified Boussinesq flows in the regime of strong stratification and rapid rotation. In this paper, we establish the invalidity of such approximation when the rotation-stratification ratio is either fixed to be unity or tends to unity sufficiently slowly in the asymptotic regime: the difference between the rotating stratified Boussinesq flow and the corresponding QG flow remains strictly away from zero, independently of the intensities of rotation and stratification. In contrast, we also show that the convergence occurs when the rotation-stratification ratio is fixed to be a number other than unity or converges to unity sufficiently fast. As a corollary, we compute a lower bound of the convergence rate, which blows up as the rotation-stratification ratio goes to unity.

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。

↑