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arXiv 1409.4293math.APmath.DSnlin.CDphysics.flu-dyn
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均匀不可压两相流的正则化模型族

On a regularized family of models for homogeneous incompressible two-phase flows

Ciprian G. Gal, T. Tachim Medjo

摘要:

本文考虑一类基于Allen-Cahn公式的不可压缩两相流正则化模型,该模型在n维紧致黎曼流形中(n= 2,3).我们考虑的系统由一个正则化的斯托克斯方程族(包括Navier-Stokes-α-like模型、Leray-α模型、Modified Leray-α模型、Simplified Bardina模型、Navier-Stokes-Voight模型和Navier-Stokes模型)和一个适当耦合的对流Allen-Cahn方程组成。我们给出了一个统一的分析,整个三参数家庭的两相模型只使用抽象的映射性质的主要耗散和平滑算子,然后使用假设的具体形式的参数化,导致特定的模型,只有在必要时,以获得最尖锐的结果。我们建立了解的存在性、稳定性和正则性结果,以及奇异扰动的一些结果,这些结果作为特例包括粘性模型的无粘极限和α-模型的α->0极限.然后,我们还证明了我们的一般模型的全局吸引子和指数吸引子的存在性,然后建立精确的条件下,每个轨迹收敛到一个单一的平衡通过LS不等式。我们还得到了新的结果的存在性的整体和指数吸引的正则化家庭的Navier-斯托克斯方程和磁流体力学模型,改善和补充的结果Holst等。[J. Nonlinear Science 20,2010,523-567]。最后,我们的分析适用于某些正则化的埃里克森-莱斯利(RSEL)模型的液晶流体动力学在n维紧致黎曼流形。

英文摘要:

We consider a general family of regularized models for incompressible two-phase flows based on the Allen-Cahn formulation in n-dimensional compact Riemannian manifolds for n=2,3. The system we consider consists of a regularized family of Navier-Stokes equations (including the Navier-Stokes-α-like model, the Leray-α model, the Modified Leray-α model, the Simplified Bardina model, the Navier-Stokes-Voight model and the Navier-Stokes model) for the fluid velocity suitably coupled with a convective Allen-Cahn equation for the (phase) order parameter. We give a unified analysis of the entire three-parameter family of two-phase models using only abstract mapping properties of the principal dissipation and smoothing operators, and then use assumptions about the specific form of the parametrizations, leading to specific models, only when necessary to obtain the sharpest results. We establish existence, stability and regularity results, and some results for singular perturbations, which as special cases include the inviscid limit of viscous models and the α->0 limit in α-models. Then, we also show the existence of a global attractor and exponential attractor for our general model, and then establish precise conditions under which each trajectory converges to a single equilibrium by means of a LS inequality. We also derive new results on the existence of global and exponential attractors for the regularized family of Navier-Stokes equations and magnetohydrodynamics models which improve and complement the results of Holst et. al. [J. Nonlinear Science 20, 2010, 523-567]. Finally, our analysis is applied to certain regularized Ericksen-Leslie (RSEL) models for the hydrodynamics of liquid crystals in n-dimensional compact Riemannian manifolds.

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