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arXiv 1202.5671math.AP
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一类扩展Navier-Stokes系统的矫顽力和稳定性结果

Coercivity and stability results for an extended Navier-Stokes system

Gautam Iyer, Robert L. Pego, Arghir Zarnescu

摘要:

在这篇文章中,我们研究的方程组,是已知的{ \em扩展} Navier-Stokes动力学在一个适定的方式速度场,不一定是发散自由。我们的目标是有助于理解的分歧和压力的作用,在发展中国家的能源估计能够控制的非线性条款。我们解决的问题的整体存在性和稳定性的有界区域与无滑移边界条件。即使在两个空间维度中,全球存在一般是开放的,并且仍然如此,主要是由于缺乏一个独立的$L^2$能量估计。然而,通过使用新的$H^1$估计的线性方程,我们建立了一些整体的存在性和稳定性的结果,包括结果的小发散和时间离散计划。我们还证明了在二维的任何初始数据的整体存在性,提供足够的发散阻尼。

英文摘要:

In this article we study a system of equations that is known to {\em extend} Navier-Stokes dynamics in a well-posed manner to velocity fields that are not necessarily divergence-free. Our aim is to contribute to an understanding of the role of divergence and pressure in developing energy estimates capable of controlling the nonlinear terms. We address questions of global existence and stability in bounded domains with no-slip boundary conditions. Even in two space dimensions, global existence is open in general, and remains so, primarily due to the lack of a self-contained $L^2$ energy estimate. However, through use of new $H^1$ coercivity estimates for the linear equations, we establish a number of global existence and stability results, including results for small divergence and a time-discrete scheme. We also prove global existence in 2D for any initial data, provided sufficient divergence damping is included.

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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