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arXiv 0901.4412math.APmath-phmath.MP
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一类正则Navier-Stokes和MHD模型的分析

Analysis of a General Family of Regularized Navier-Stokes and MHD Models

Michael Holst, Evelyn Lunasin, Gantumur Tsogtgerel

摘要:

本文考虑一类n维光滑紧致黎曼流形上的正则化Navier-Stokes和磁流体力学模型,其中n大于或等于2。这个族涵盖了文献中提出和分析的大多数特定正则化模型,包括Navier-斯托克斯方程、Navier-Stokes-alpha模型、Leray-alpha模型、修正的Leray-alpha模型、简化的Bardina模型、Navier-Stokes-Voight模型、Navier-Stokes-alpha类模型和某些MHD模型,除了表示先前未分析的更大的3参数模型族之外。我们给出了一个统一的分析,整个三参数家庭只使用抽象的映射性质的主要耗散和平滑算子,然后使用特定的参数化,以获得最尖锐的结果。我们首先建立了解的存在性和正则性结果,并在适当的假设下证明了解的唯一性和稳定性。然后,我们建立奇异扰动的结果,包括无粘和α极限。接下来,我们证明了一般模型的全局吸引子的存在性,并给出其维数的估计。最后,我们建立了耗散和非耗散模型子族的决定算子的一些结果。除了建立了一些结果,在这个一般家庭的所有模型,该框架恢复了以前的大部分结果的存在性,规律性,唯一性,稳定性,吸引子的存在性和尺寸,并确定运营商为这个家庭的知名成员。

英文摘要:

We consider a general family of regularized Navier-Stokes and Magnetohydrodynamics (MHD) models on n-dimensional smooth compact Riemannian manifolds with or without boundary, with n greater than or equal to 2. This family captures most of the specific regularized models that have been proposed and analyzed in the literature, including the Navier-Stokes equations, the Navier-Stokes-alpha model, the Leray-alpha model, the Modified Leray-alpha model, the Simplified Bardina model, the Navier-Stokes-Voight model, the Navier-Stokes-alpha-like models, and certain MHD models, in addition to representing a larger 3-parameter family of models not previously analyzed. We give a unified analysis of the entire three-parameter family using only abstract mapping properties of the principle dissipation and smoothing operators, and then use specific parameterizations to obtain the sharpest results. We first establish existence and regularity results, and under appropriate assumptions show uniqueness and stability. We then establish results for singular perturbations, including the inviscid and alpha limits. Next we show existence of a global attractor for the general model, and give estimates for its dimension. We finish by establishing some results on determining operators for subfamilies of dissipative and non-dissipative models. In addition to establishing a number of results for all models in this general family, the framework recovers most of the previous results on existence, regularity, uniqueness, stability, attractor existence and dimension, and determining operators for well-known members of this family.

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。

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