arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2201.09022math.AP
收藏

含表面活性剂的不可压缩两相流的Navier-Stokes-Cahn-Hilliard系统的适定性

Well-posedness for a Navier-Stokes-Cahn-Hilliard System for Incompressible Two-phase Flows with Surfactant

Andrea Di Primio, Maurizio Grasselli, Hao Wu

AI总结:

本文研究了含表面活性剂的不可压缩两相流扩散界面模型,证明了全局弱解的存在性与二维唯一性,并在更强正则性下建立了二维全局和三维局部强解,同时推导出连续依赖性估计与瞬时正则化性质。

摘要:

我们研究了一个描述含表面活性剂的不可压缩两相粘性流动力学的扩散界面模型。所得偏微分方程组由一个关于二元流体混合物局部浓度差的六阶Cahn-Hilliard方程,与一个关于表面活性剂局部浓度的四阶Cahn-Hilliard方程耦合而成。前者具有光滑势,后者具有奇异势。这两个方程均与关于(体积平均)流体速度的Navier-Stokes系统相耦合。该发展系统配备了适当的初始条件、速度场的无滑移边界条件,以及相函数和化学势的齐次Neumann边界条件。我们首先证明了全局弱解的存在性,并得出该解在二维情况下是唯一的。对初始数据施加更强的正则性假设后,我们证明了在二维(分别在三维)中存在唯一的全局(分别在局部)强解。在二维情况下,我们能够推导出关于由总能量控制的范数的连续依赖性估计。随后,我们建立了 $t>0$ 时全局弱解的瞬时正则化性质。特别地,我们证明了表面活性剂浓度在经过一段正时间后,会一致地远离纯态 $0$ 和 $1$。

英文摘要:

We investigate a diffuse-interface model that describes the dynamics of incompressible two-phase viscous flows with surfactant. The resulting system of partial differential equations consists of a sixth-order Cahn-Hilliard equation for the difference of local concentrations of the binary fluid mixture coupled with a fourth-order Cahn-Hilliard equation for the local concentration of the surfactant. The former has a smooth potential, while the latter has a singular potential. Both equations are coupled with a Navier-Stokes system for the (volume averaged) fluid velocity. The evolution system is endowed with suitable initial conditions, a no-slip boundary condition for the velocity field and homogeneous Neumann boundary conditions for the phase functions as well as for the chemical potentials. We first prove the existence of a global weak solution, which turns out to be unique in two dimensions. Stronger regularity assumptions on the initial data allow us to prove the existence of a unique global (resp. local) strong solution in two (resp. three) dimensions. In the two dimensional case, we can derive a continuous dependence estimate with respect to the norms controlled by the total energy. Then we establish instantaneous regularization properties of global weak solutions for $t>0$. In particular, we show that the surfactant concentration stays uniformly away from the pure states $0$ and $1$ after some positive time.

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。

↑