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arXiv 1101.3906math.AP
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一类非局部Cahn-Hilliard-Navier-Stokes方程组弱解的整体存在性

Global Existence of Weak Solutions to a Nonlocal Cahn-Hilliard-Navier-Stokes System

Pierluigi Colli, Sergio Frigeri, Maurizio Grasselli

摘要:

一个著名的扩散界面模型由Navier-斯托克斯方程与对流Cahn-Hilliard型方程非线性耦合组成。这个系统描述了一个不可压缩的等温二元流体混合物的演变,它已经被许多作者研究。在这里,我们考虑这个模型的一个变种,其中标准的Cahn-Hilliard方程被其非局部版本所取代。更准确地说,自由能泛函中的梯度项由作用于序参数phi的空间卷积算子代替,而势F可以具有任何多项式增长。因此,由于phi缺乏规律性,即使在两个空间维度中,与Navier-斯托克斯方程的耦合也难以处理。我们建立了一个整体存在的弱解。在二维情况下,我们还证明了这样的解决方案满足能量恒等式和耗散估计,提供F满足适当的双线性条件。

英文摘要:

A well-known diffuse interface model consists of the Navier-Stokes equations nonlinearly coupled with a convective Cahn-Hilliard type equation. This system describes the evolution of an incompressible isothermal mixture of binary-fluids and it has been investigated by many authors. Here we consider a variant of this model where the standard Cahn-Hilliard equation is replaced by its nonlocal version. More precisely, the gradient term in the free energy functional is replaced by a spatial convolution operator acting on the order parameter phi, while the potential F may have any polynomial growth. Therefore the coupling with the Navier-Stokes equations is difficult to handle even in two spatial dimensions because of the lack of regularity of phi. We establish the global existence of a weak solution. In the two-dimensional case we also prove that such a solution satisfies the energy identity and a dissipative estimate, provided that F fulfills a suitable coercivity condition.

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