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arXiv 1107.5933math.AP
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非局部Cahn-Hilliard-Navier-Stokes系统的全局和轨迹吸引子

Global and trajectory attractors for a nonlocal Cahn-Hilliard-Navier-Stokes system

Sergio Frigeri, Maurizio Grasselli

摘要:

Cahn-Hilliard-Navier-Stokes系统基于一个著名的扩散界面模型,描述了二元流体的不可压缩等温混合物的演化。一个非局部变量由Navier-斯托克斯方程与一个非局部Cahn-Hilliard方程适当耦合组成。作者与P. Colli一起证明了一类非局部Cahn-Hilliard-Navier-Stokes方程组在无滑移和无通量边界条件下整体弱解的存在性。即使在二维空间中,统一性仍然是一个悬而未决的问题。然而,在这种情况下,能量恒等式成立。这里利用这个属性来定义,继J.M. Ball方法,一个具有全局吸引子的广义半流。通过类似的论证,我们也可以证明具有给定速度场的对流非局部Cahn-Hilliard方程的(连通)整体吸引子的存在性,即使是在三维中。最后,我们证明了任何满足能量不等式的弱解也满足一个能量不等式。这使我们能够建立存在的轨迹吸引子也在三维不定常外力。

英文摘要:

The Cahn-Hilliard-Navier-Stokes system is based on a well-known diffuse interface model and describes the evolution of an incompressible isothermal mixture of binary fluids. A nonlocal variant consists of the Navier-Stokes equations suitably coupled with a nonlocal Cahn-Hilliard equation. The authors, jointly with P. Colli, have already proven the existence of a global weak solution to a nonlocal Cahn-Hilliard-Navier-Stokes system subject to no-slip and no-flux boundary conditions. Uniqueness is still an open issue even in dimension two. However, in this case, the energy identity holds. This property is exploited here to define, following J.M. Ball's approach, a generalized semiflow which has a global attractor. Through a similar argument, we can also show the existence of a (connected) global attractor for the convective nonlocal Cahn-Hilliard equation with a given velocity field, even in dimension three. Finally, we demonstrate that any weak solution fulfilling the energy inequality also satisfies an energy inequality. This allows us to establish the existence of the trajectory attractor also in dimension three with a time dependent external force.

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