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arXiv 1405.6964math.AP
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多孔介质中广义Forchheimer流的性质

Properties of Generalized Forchheimer Flows in Porous Media

Luan T. Hoang, Thinh T. Kieu, Tuoc V. Phan

摘要:

当达西定律不适用时,用非线性Forchheimer方程来描述多孔介质中的流体流动。在这篇文章中,我们考虑了广义Forchheimer流动的轻微可压缩流体和研究所产生的退化抛物型方程的压力与时间相关的通量边界条件的初边值问题。我们估计$L^\infty$ -范数的压力和它的时间导数,以及其他勒贝格范数的梯度和二阶空间导数。强调了时间趋于无穷大时的渐近估计。然后,我们表明,解决方案(在内部$L^\infty$ -规范)和它的梯度(在内部$L^{2-δ}$ -规范)连续依赖于初始和边界数据,系数的Forchheimer多项式。这些都证明了有限的时间间隔和时间无限。De Giorgi和Ladyzhenskaya-Uraltseva迭代技术与均匀Gronwall型估计,特定的单调性,适当的抛物Sobolev嵌入和一个新的快速几何收敛结果相结合。

英文摘要:

The nonlinear Forchheimer equations are used to describe the dynamics of fluid flows in porous media when Darcy's law is not applicable. In this article, we consider the generalized Forchheimer flows for slightly compressible fluids and study the initial boundary value problem for the resulting degenerate parabolic equation for pressure with the time-dependent flux boundary condition. We estimate $L^\infty$-norm for pressure and its time derivative, as well as other Lebesgue norms for its gradient and second spatial derivatives. The asymptotic estimates as time tends to infinity are emphasized. We then show that the solution (in interior $L^\infty$-norms) and its gradient (in interior $L^{2-δ}$-norms) depend continuously on the initial and boundary data, and coefficients of the Forchheimer polynomials. These are proved for both finite time intervals and time infinity. The De Giorgi and Ladyzhenskaya-Uraltseva iteration techniques are combined with uniform Gronwall-type estimates, specific monotonicity properties, suitable parabolic Sobolev embeddings and a new fast geometric convergence result.

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