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arXiv 1901.07296math.AP
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一类具有交叉扩散的两相流模型的整体解的存在性

Global existence for a two-phase flow model with cross diffusion

Esther S. Daus, Josipa-Pina Milišić, Nicola Zamponi

摘要:

本文研究了一个退化的伪抛物型方程组,该方程组描述了多孔介质中具有动态毛细压力的不饱和两相流混合物的密度演化,其中松弛因子与饱和度有关,次强制扩散算子模拟了交叉扩散.这些方程是从质量守恒定律中推导出来的。证明了在平衡边界条件下,系统在有界区域上的弱解的整体存在性。分析的主要工具是一个熵不等式和一个至关重要的先验界,它允许控制退化。

英文摘要:

In this work we study a degenerate pseudo-parabolic system with cross diffusion describing the evolution of the densities of an unsaturated two-phase flow mixture with dynamic capillary pressure in porous medium with saturation-dependent relaxation parameter and hypocoercive diffusion operator modeling cross diffusion. The equations are derived in a thermodynamically correct way from mass conservation laws. Global-in-time existence of weak solutions to the system in a bounded domain with equilibrium boundary conditions is shown. The main tools of the analysis are an entropy inequality and a crucial apriori bound which allows for controlling the degeneracy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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