多孔介质中非局部Navier-Stokes-Korteweg方程的均匀化
Homogenization of Non-Local Navier-Stokes-Korteweg Equations for Compressible Liquid-Vapour Flow in Porous Media
摘要：
本文考虑了具有非单调压力律的准静态Navier-Stokes-Korteweg方程的非局部形式。该系统控制可压缩粘性流体的低雷诺数动力学，该流体可以是液体或蒸汽状态。针对多孔介质中孔洞直径与孔洞间距成正比的问题，分析了均匀化极限。我们扩展的结果与多方压力法的可压缩单相流，并证明了有效的运动是由一个非本地版本的Cahn-Hilliard方程。分析的关键是卷积的非局部毛细作用项，允许配备一个广义的凸自由能系统的结构。此外，毛细作用项不仅考虑了流体内的能量相互作用，而且还考虑了与固体壁边界的相互作用。
英文摘要：
We consider a nonlocal version of the quasi-static Navier-Stokes-Korteweg equations with a non-monotone pressure law. This system governs the low-Reynolds number dynamics of a compressible viscous fluid that may take either a liquid or a vapour state. For a porous domain that is perforated by cavities with diameter proportional to their mutual distance the homogenization limit is analyzed. We extend the results for compressible one-phase flow with polytropic pressure laws and prove that the effective motion is governed by a nonlocal version of the Cahn-Hilliard equation. Crucial for the analysis is the convolution-like structure of the nonlocal capillarity term that allows to equip the system with a generalized convex free energy. Moreover, the capillarity term accounts not only for the energetic interaction within the fluid but also for the interaction with a solid wall boundary.
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