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arXiv 1810.11554math.AP
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Navier-Stokes-Cahn-Hilliard 系统的唯一性与正则性

Uniqueness and regularity for the Navier-Stokes-Cahn-Hilliard system

Andrea Giorgini, Alain Miranville, Roger Temam

AI总结:

本文研究带物理对数势的Navier-Stokes-Cahn-Hilliard系统(Model H),在二维有界光滑域证明弱解唯一性、全局强解存在唯一性及相关正则性,在三维域证明局部强解的存在唯一性。

摘要:

两种相邻不可压缩粘性流体的运动在扩散界面理论中由所谓的Model H(H模型)描述。该系统由Navier-Stokes方程与Cahn-Hilliard方程耦合而成,后者关联着含物理相关对数势的Ginzburg-Landau自由能。本文在d=2和d=3的R^d有界光滑区域中研究该模型,辅以速度的无滑移条件、序参量与化学势的齐次Neumann边界条件,以及合适的初始条件。我们研究弱解和强解的唯一性与正则性。在二维区域中,我们证明了弱解的唯一性,以及源自初始速度u_0属于V(即u_0属于H_0^1且满足div u_0=0)的全局强解的存在性与唯一性。此外,我们证明了进一步的正则性性质以及瞬时分离性质的成立。在三维区域中,我们证明了初始速度u_0属于V的局部强解的存在性与唯一性。

英文摘要:

The motion of two contiguous incompressible and viscous fluids is described within the diffuse interface theory by the so-called Model H. The system consists of the Navier-Stokes equations, which are coupled with the Cahn-Hilliard equation associated to the Ginzburg-Landau free energy with physically relevant logarithmic potential. This model is studied in bounded smooth domain in R^d, d=2 and d=3, and is supplemented with a no-slip condition for the velocity, homogeneous Neumann boundary conditions for the order parameter and the chemical potential, and suitable initial conditions. We study uniqueness and regularity of weak and strong solutions. In a two-dimensional domain, we show the uniqueness of weak solutions and the existence and uniqueness of global strong solutions originating from an initial velocity u_0 in V, namely u_0 in H_0^1 such that div u_0=0. In addition, we prove further regularity properties and the validity of the instantaneous separation property. In a three-dimensional domain, we show the existence and uniqueness of local strong solutions with initial velocity u_0 in V.

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