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arXiv 2103.11513math.AP
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非齐次不可压Navier-斯托克斯方程解的极大$L^1$正则性

Maximal $L^1$ regularity for solutions to inhomogeneous incompressible Navier-Stokes equations

Huan Xu

摘要:

本文致力于在初速度标度不变的小假设下,研究非齐次不可压缩Navier-斯托克斯方程解的最大$L^1$正则性和渐近行为。我们得到了一个新的整体$L^1$的时间估计的Lipschitz的速度场的初始密度起伏没有任何小的假设。在这个估计的推导过程中,我们研究了变系数线性Stokes系统的最大$L^1$正则性。分析工具是利用广义Stokes算子生成的半群刻画一类散度型二阶椭圆型方程的Besov范数和一个新的梯度估计.该方法还可用于研究不可压缩或可压缩粘性流体引起的其它问题。

英文摘要:

This paper is devoted to the maximal $L^1$ regularity and asymptotic behavior for solutions to the inhomogeneous incompressible Navier-Stokes equations under a scaling-invariant smallness assumption on the initial velocity. We obtain a new global $L^1$-in-time estimate for the Lipschitz seminorm of the velocity field without any smallness assumption on the initial density fluctuation. In the derivation of this estimate, we study the maximal $L^1$ regularity for a linear Stokes system with variable coefficients. The analysis tools are a use of the semigroup generated by a generalized Stokes operator to characterize some Besov norms and a new gradient estimate for a class of second-order elliptic equations of divergence form. Our method might be used to study some other issues arising from incompressible or compressible viscous fluids.

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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