arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.04279math.AP
收藏

快速旋转粘性导热流体的多尺度问题

A multi-scale problem for viscous heat-conducting fluids in fast rotation

Daniele Del Santo, Francesco Fanelli, Gabriele Sbaiz, Aneta Wróblewska-Kamińska

摘要:

在本文中,我们研究了不可压缩和快速旋转的组合限制的完整的Navier-Stokes-Fourier系统的科里奥利,离心力和引力,在小的马赫数,弗劳德和Rossby数的制度和一般准备不良的初始数据。我们考虑各向同性标度(其中所有的数字具有相同的数量级)和多尺度的情况下(其中一些效果是相对于其他占主导地位)。在马赫数比Rossby数高阶的情况下,我们证明了极限动力学是由不可压缩的Oberbeck-Boussinesq系统描述的,其中速度场是水平的(根据泰勒-普劳德曼定理),但温度方程的垂直影响是不可忽略的。相反,当马赫数和Rossby数具有相同的数量级,在没有离心力的情况下,我们表明收敛到准地转方程的流函数的极限速度场,再加上一个新的未知的传输-扩散方程,其中链接的目标密度和温度分布。收敛性的证明是基于一个补偿的紧凑性参数。关键是识别隐藏在声波-庞加莱波系统中的一些紧性性质。与以前的结果相比,我们的方法首先能够处理多尺度问题中的整个参数范围,并且还考虑具有某种关键选择$Fr=\sqrt{Ma}$的低弗劳德数区域,其中$Ma$是马赫数。这使我们能够在极限中捕获一些(低)分层效应。

英文摘要:

In the present paper, we study the combined incompressible and fast rotation limits for the full Navier-Stokes-Fourier system with Coriolis, centrifugal and gravitational forces, in the regime of small Mach, Froude and Rossby numbers and for general ill-prepared initial data. We consider both the isotropic scaling (where all the numbers have the same order of magnitude) and the multi-scale case (where some effect is predominant with respect to the others). In the case when the Mach number is of higher order than the Rossby number, we prove that the limit dynamics is described by an incompressible Oberbeck-Boussinesq system, where the velocity field is horizontal (according to the Taylor-Proudman theorem), but vertical effects on the temperature equation are not negligible. Instead, when the Mach and Rossby numbers have the same order of magnitude, and in absence of the centrifugal force, we show convergence to a quasi-geostrophic equation for a stream function of the limit velocity field, coupled with a transport-diffusion equation for a new unknown, which links the target density and temperature profiles. The proof of the convergence is based on a compensated compactness argument. The key point is to identify some compactness properties hidden in the system of acoustic-Poincaré waves. Compared to previous results, our method enables first of all to treat the whole range of parameters in the multi-scale problem, and also to consider a low Froude number regime with the somehow critical choice $Fr=\sqrt{Ma}$, where $Ma$ is the Mach number. This allows us to capture some (low) stratification effects in the limit.

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。

↑