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arXiv 1603.09220math.APmath-phmath.MP
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一类不可压牛顿流动态流出边界条件的强适定性

Strong Well-Posedness for a Class of Dynamic Outflow Boundary Conditions for Incompressible Newtonian Flows

Dieter Bothe, Takahito Kashiwabara, Matthias Köhne

摘要:

基于能量考虑,我们推导出一类不可压缩Navier-斯托克斯方程的动态流出边界条件,其中包含众所周知的对流边界条件,但也包含出口处的应力。作为分析此类问题的关键组成部分,我们考虑了半空间中具有这种动态流出边界条件的斯托克斯方程,并证明了在适当的Sobolev-Slobodeckij-设置中存在强解,其中$L_p$(在时间和空间中)作为动量平衡的底空间。当边界条件中应力贡献为非零时,在自然协调条件下,该问题实际上具有$L_p$ -极大正则性。针对弱奇异域问题的存在性理论,其中不同的边界条件适用于不同部分的边界,使这些表面满足正交,我们还考虑了原型域的楔形开口角$\fracπ{2}$和不同的边界条件的组合:Navier-Slip与Dirichlet和Navier-Slip与动态流出边界条件。再次,最大的正则性的问题得到了适当的功能分析设置和自然的兼容性条件。

英文摘要:

Based on energy considerations, we derive a class of dynamic outflow boundary conditions for the incompressible Navier-Stokes equations, containing the well-known convective boundary condition but incorporating also the stress at the outlet. As a key building block for the analysis of such problems, we consider the Stokes equations with such dynamic outflow boundary conditions in a halfspace and prove the existence of a strong solution in the appropriate Sobolev-Slobodeckij-setting with $L_p$ (in time and space) as the base space for the momentum balance. For non-vanishing stress contribution in the boundary condition, the problem is actually shown to have $L_p$-maximal regularity under the natural compatibility conditions. Aiming at an existence theory for problems in weakly singular domains, where different boundary conditions apply on different parts of the boundary such that these surfaces meet orthogonally, we also consider the prototype domain of a wedge with opening angle $\fracπ{2}$ and different combinations of boundary conditions: Navier-Slip with Dirichlet and Navier-Slip with the dynamic outflow boundary condition. Again, maximal regularity of the problem is obtained in the appropriate functional analytic setting and with the natural compatibility conditions.

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