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arXiv 1909.09894math.AP
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大马赫数下正压Navier-斯托克斯方程的不可压缩和快速旋转极限

Incompressible and fast rotation limit for barotropic Navier-Stokes equations at large Mach numbers

Francesco Fanelli

摘要:

本文研究了具有Coriolis力的正压Navier-斯托克斯方程的不可压快旋极限,即当马赫数$\rm Ma$相对于Rossby数$\rm Ro$较大时,即我们主要研究${\rm Ro}\ll{\rm Ma}$区域。为此,我们遵循Danchin和Mucha在\cite{D-M}中的最新方法,并且还采用大的体积粘度系数。我们证明了极限动力学描述的不可压缩的Navier-Stokes型方程,重铸的涡制剂,然而,一个额外的未知数,连接到一个固定的常数参考状态周围的密度振荡,发挥作用。收敛性的证明是基于一个补偿的紧凑性参数和推导的急剧衰减估计的解决方案的热方程的快速扩散的时间。

英文摘要:

In the present paper we study the incompressible and fast rotation limit for the barotropic Navier-Stokes equations with Coriolis force, in the case when the Mach number $\rm Ma$ is large with respect to the Rossby number $\rm Ro$: namely, we focus on the regime ${\rm Ro}\ll{\rm Ma}$. For this, we follow a recent approach by Danchin and Mucha in \cite{D-M} and take also a large bulk viscosity coefficient. We prove that the limit dynamics is described by an incompressible Navier-Stokes type equation, recasted in the vorticy formulation, where however an additional unknown, linked to density oscillations around a fixed constant reference state, comes into play. The proof of the convergence is based on a compensated compactness argument and on the derivation of sharp decay estimates for solutions to a heat equation with fast diffusion in time.

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