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arXiv 2107.02269math.AP
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具有奇异势和退化迁移率的非局部Cahn-Hilliard-Hele-Shaw系统

Nonlocal Cahn-Hilliard-Hele-Shaw systems with singular potential and degenerate mobility

Cecilia Cavaterra, Sergio Frigeri, Maurizio Grasselli

摘要:

本文研究两种流体不可压缩混合的Cahn-Hilliard-Hele-Shaw(或Cahn-Hilliard-Darcy)系统。相对浓度差$φ$由具有简并迁移率和对数势的对流非局部Cahn-Hilliard方程控制。体积平均流体速度$\mathbf{u}$服从达西定律,这取决于所谓的Korteweg力$μ\nabla φ$,其中$μ$是非局部化学势。另外,运动粘度$η$可取决于$φ$。首先证明了满足能量恒等式的整体弱解的存在性。然后证明了一个强解的存在性。进一步得到了压力和$\mathbf{u}$的规律性结果。弱-强唯一性在二维情形下得到了证明。在三维情形下,当$η$为常数时,弱解的唯一性成立.另外,通过假设强解的压力在空间上是$α$连续的,证明了$α\in (1/5,1)$的弱-强唯一性.

英文摘要:

We study a Cahn-Hilliard-Hele-Shaw (or Cahn-Hilliard-Darcy) system for an incompressible mixture of two fluids. The relative concentration difference $φ$ is governed by a convective nonlocal Cahn-Hilliard equation with degenerate mobility and logarithmic potential. The volume averaged fluid velocity $\mathbf{u}$ obeys a Darcy's law depending on the so-called Korteweg force $μ\nabla φ$, where $μ$ is the nonlocal chemical potential. In addition, the kinematic viscosity $η$ may depend on $φ$. We establish first the existence of a global weak solution which satisfies the energy identity. Then we prove the existence of a strong solution. Further regularity results on the pressure and on $\mathbf{u}$ are also obtained. Weak-strong uniqueness is demonstrated in the two dimensional case. In the three-dimensional case, uniqueness of weak solutions holds if $η$ is constant. Otherwise, weak-strong uniqueness is shown by assuming that the pressure of the strong solution is $α$-Hölder continuous in space for $α\in (1/5,1)$.

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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