arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.10667math.AP
收藏

一类强迫活动标量方程的消失扩散极限和长时间行为

Vanishing diffusion limits and long time behaviour of a class of forced active scalar equations

Susan Friedlander, Anthony Suen

摘要:

研究了分数阶Laplacian算子下一类抽象的对流扩散方程的性质。两个独立的扩散参数进入系统,一个通过本构律的漂移速度和一个作为前因子的分数拉普拉斯算子。我们得到的存在性和收敛性结果在一定的参数制度和限制。我们研究了一般问题解的长时间行为,并证明了唯一的全局吸引子的存在性。我们将结果应用于地球物理流体动力学中的两个特殊的活动标量方程,即地表准地转方程和磁地转方程。

英文摘要:

We investigate the properties of an abstract family of advection diffusion equations in the context of the fractional Laplacian. Two independent diffusion parameters enter the system, one via the constitutive law for the drift velocity and one as the prefactor of the fractional Laplacian. We obtain existence and convergence results in certain parameter regimes and limits. We study the long time behaviour of solutions to the general problem and prove the existence of a unique global attractor. We apply results to two particular active scalar equations arising in geophysical fluid dynamics, namely the surface quasigeostrophic equation and the magnetogeostrophic equation.

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。

↑