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arXiv 0901.0144math.APmath-phmath.MP
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非平边界上具有运动学和涡度边界条件的Navier-斯托克斯方程

The Navier-Stokes Equations with the Kinematic and Vorticity Boundary Conditions on Non-Flat Boundaries

Gui-Qiang Chen, Dan Osborne, Zhongmin Qian

摘要:

在具有紧致光滑边界的$\R^n$中,研究了一般区域上不可压缩流体Navier-斯托克斯方程的初边值问题,在非平坦边界上,考虑了运动学和涡量边界条件.我们观察到,在非齐次边界条件下,压力$p$仍然可以通过求解泊松方程的Neumann问题来恢复。然后我们建立了非定常斯托克斯方程的适定性,并利用该解将我们的初边值问题化为一个具有绝对边界条件的初边值问题。在此基础上,我们首先建立了一个适当的局部线性化问题的绝对边界条件和初始条件(没有不可压缩性条件),这建立了一个速度映射的适定性。然后我们发展了速度映射的\emph{apriori}估计,特别是涉及到映射的时间导数的Sobolev范数来处理复杂的边界条件,这导致了映射的不动点的存在性和我们的初边值问题的解的存在性.最后,我们建立了当粘性系数趋于零时,具有非齐次涡度边界条件的$\R^n (n\ge 3)$中初边值问题的强解在$L^2$中收敛到满足运动学条件的相应欧拉方程。

英文摘要:

We study the initial-boundary value problem of the Navier-Stokes equations for incompressible fluids in a general domain in $\R^n$ with compact and smooth boundary, subject to the kinematic and vorticity boundary conditions on the non-flat boundary. We observe that, under the nonhomogeneous boundary conditions, the pressure $p$ can be still recovered by solving the Neumann problem for the Poisson equation. Then we establish the well-posedness of the unsteady Stokes equations and employ the solution to reduce our initial-boundary value problem into an initial-boundary value problem with absolute boundary conditions. Based on this, we first establish the well-posedness for an appropriate local linearized problem with the absolute boundary conditions and the initial condition (without the incompressibility condition), which establishes a velocity mapping. Then we develop \emph{apriori} estimates for the velocity mapping, especially involving the Sobolev norm for the time-derivative of the mapping to deal with the complicated boundary conditions, which leads to the existence of the fixed point of the mapping and the existence of solutions to our initial-boundary value problem. Finally, we establish that, when the viscosity coefficient tends zero, the strong solutions of the initial-boundary value problem in $\R^n (n\ge 3)$ with nonhomogeneous vorticity boundary condition converges in $L^2$ to the corresponding Euler equations satisfying the kinematic condition.

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