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arXiv 1111.1285math.AP
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具有渐近稳定边界条件和外力作用的双折射液晶流体力学模型的长时间行为

Long-time behavior for a hydrodynamic model on nematic liquid crystal flows with asymptotic stabilizing boundary condition and external force

Maurizio Grasselli, Hao Wu

摘要:

在本文中,我们考虑了一个简化的Ericksen-Leslie模型的液晶流。演化系统由Navier-斯托克斯方程和对流Ginzburg-Landau型方程组成。假设Navier-斯托克斯方程满足无滑移边界条件和含时外力g(t),而分子指向矢方程满足含时Dirichlet边界条件h(t).我们证明了在二维情形下,当h(t)和g(t)分别收敛到与时间无关的边界点h_ \infty和0时,每个整体弱解收敛到一个定态.并对算法的收敛速度进行了估计。在3D的情况下,我们证明了全球弱解最终强,使类似的结果可以证明的2D情况。我们还证明了整体强解的存在性,只要粘性足够大或初始数据接近给定的平衡点。

英文摘要:

In this paper, we consider a simplified Ericksen-Leslie model for the nematic liquid crystal flow. The evolution system consists of the Navier-Stokes equations coupled with a convective Ginzburg-Landau type equation for the averaged molecular orientation. We suppose that the Navier-Stokes equations are characterized by a no-slip boundary condition and a time-dependent external force g(t), while the equation for the molecular director is subject to a time-dependent Dirichlet boundary condition h(t). We show that, in 2D, each global weak solution converges to a single stationary state when h(t) and g(t) converge to a time-independent boundary datum h_\infty and 0, respectively. Estimates on the convergence rate are also obtained. In the 3D case, we prove that global weak solutions are eventually strong so that results similar to the 2D case can be proven. We also show the existence of global strong solutions, provided that either the viscosity is large enough or the initial datum is close to a given equilibrium.

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