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arXiv 1702.02077math.AP
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二维二阶流体的完全非齐次问题

Fully non-homogeneous problem of two-dimensional second grade fluids

Jean Marie Bernard

摘要:

本文研究了速度u为完全非齐次边界条件的二维二级流体模型的解。与许多作者研究的齐次或切向边界条件问题相比,我们必须添加一个边界条件,否则问题不再是适定的。在$\partial$ $Ω$中$α$ u的部分上,我们提出了z = curl(u -$α$ $Δ$ u)的两个条件,它们根据z的正则性而不同。n \textless{} 0.根据V. Girault和L.R. Scott在切向边界的情况下,我们分裂成一个系统的广义Stokes问题和运输问题。但是,与这些作者的研究相比,我们现在被引导来解决带边界条件的输运问题。在前两篇文章中,我们研究了这些运输问题。在这些文章中得到的结果允许我们,通过一个不动点的论点,建立完全非齐次的二阶问题的解的存在性。唯一性要求边界条件z在H1中。

英文摘要:

This article studies the solutions of a two-dimensional grade-two fluid model with a fully non-homogeneous boundary condition for velocity u. Compared to problems with a homogeneous or tangential boundary condition, studied by many authors , we must add a boundary condition, otherwise the problem is no longer well-posed. We propose two conditions on z = curl (u -- $α$$Δ$u), which differ according to the regularity of z, on the portion of $\partial$$Ω$ where $α$u. n \textless{} 0. Following the approach of V. Girault and L.R. Scott in the tangential boundary case, we split the problem into a system with a generalized Stokes problem and a transport problem. But, compared to the study of these authors, we are now led to solve transport problems with boundary conditions. In two previous articles, we studied these transport problems. The results obtained in these articles allow us, by a fixed-point argument, to establish existence of the solutions for the fully non-homogeneous grade-two problem. Uniqueness requires the boundary condition with z in H 1 .

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