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arXiv 0812.4340math.APphysics.class-ph
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具有自然垂直边界条件的粗糙Poisson-狄利克雷问题的很弱估计

Very weak estimates for a rough Poisson-Dirichlet problem with natural vertical boundary conditions

Vuk Milisic

摘要:

本文是[E. Bonnetier,D.Bresch,V. Milisic,submitted];它在简化的泊松方程中处理粗糙边界。我们施加Dirichlet边界条件的周期性微观扰动的一个平坦的边缘一侧和自然齐次Neumann边界条件施加在入口/出口的域。为了防止振荡的诺依曼样边界,我们引入了一个微观的垂直校正定义在一个粗糙的四分之一平面。在[E. Bonnetier,D.Bresch,V. Milisic,提交]我们研究了在这种情况下的先验估计;在这里,我们充分发展了非常弱的估计a la Necas [J. Necas.无界域上加权索伯列夫空间中的椭圆方程理论方法。我们得到的最优估计改进了[E. Bonnetier,D.Bresch,V. Milisic,submitted].我们用数值方法验证了这些结果,证明了包括垂直修正项在内的边界层近似的一阶结果和文献[W. Jäger和A. Mikelic J. Diff.等式,N. Neus,M. Neus,A. Mikelic,Appl. Anal. 2006年]。

英文摘要:

This work is a continuation of [E. Bonnetier, D.Bresch, V. Milisic, submitted]; it deals with rough boundaries in the simplified context of a Poisson equation. We impose Dirichlet boundary conditions on the periodic microscopic perturbation of a flat edge on one side and natural homogeneous Neumann boundary conditions are applied on the inlet/outlet of the domain. To prevent oscillations on the Neumann-like boundaries, we introduce a microscopic vertical corrector defined in a rough quarter-plane. In [E. Bonnetier, D.Bresch, V. Milisic, submitted] we studied a priori estimates in this setting; here we fully develop very weak estimates a la Necas [J. Necas. Les méthodes directes en théorie des équations elliptiques] in the weighted Sobolev spaces on an unbounded domain. We obtain optimal estimates which improve those derived in [E. Bonnetier, D.Bresch, V. Milisic, submitted]. We validate these results numerically, proving first order results for boundary layer approximation including the vertical correctors and a little less for the averaged wall-law introduced in the literature [W. Jäger and A. Mikelic. J. Diff. Equa., N. Neus, M. Neus, A. Mikelic, Appl. Anal. 2006].

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