论文标题

Navier-Stokes系统的时间全球规律性具有超脉络性的扰动场景

Time-Global Regularity of the Navier-Stokes System with Hyper-Dissipation--Turbulent Scenario

论文作者

Grujic, Zoran, Xu, Liaosha

论文摘要

超临界状态中奇异性的超同时性(HD)纳皮尔 - 斯托克斯(NS)系统是否表现出自发形成,是由拉普拉斯(Laplacian)的分数力量产生的超延伸,例如$β$,例如限制为间隔$ \ bigl(1,\ frac) - 自1960年代J.L. Lions的基础工作以来的数学流体动力学。在这项工作中,更确切地说,在$β$大于一个时,就排除了一类合理的爆炸场景,证明了laplacian的关键性。框架是基于作者最近引入的高级衍生品的正面和负分量的超级和负部分的稀疏度的规模,但当前工作中的主要新颖性是HD的分类是在两个主要类别中的HD流动与一个近似类别一致的行为(近似同质性的行为),不一致的行为(不一致)(不一致的行为)湍流的形成和衰减)。主要定理指出,在非均匀情况下,任何$β$都大于一个$β$。为了说明这种结果在无方法论的环境中的影响,考虑了一个动态重新恢复的两参数家族,并且表明,只要$β$大于一个,就排除了参数空间中的新区域。更重要的是,该区域是自相似轮廓的邻域(在参数空间中),即,对于所有高清NS模型,都排除了大约自相似的爆炸,即可能的奇异性形成的主要嫌疑犯。

The question of whether the hyper-dissipative (HD) Napier-Stokes (NS) system can exhibit spontaneous formation of singularities in the super-critical regime--the hyper-diffusion being generated by a fractional power of the Laplacian, say $β$, confined to interval $\bigl(1, \frac{5}{4}\bigr)$--has been a major open problem in the mathematical fluid dynamics since the foundational work of J.L. Lions in 1960s. In this work, an evidence of criticality of the Laplacian is presented, more precisely, a class of plausible blow-up scenarios is ruled out as soon as $β$ is greater than one. While the framework is based on the scale of sparseness of the super-level sets of the positive and negative parts of the components of the higher-order derivatives of the velocity recently introduced by the authors, a major novelty in the current work is classification of the HD flows near a potential spatiotemporal singularity in two main categories, homogeneous (the case consistent with a near-steady behavior) and non-homogenous (the case consistent with the formation and decay of turbulence). The main theorem states that in the non-homogeneous case any $β$ greater than one prevents a singularity. In order to illustrate the impact of this result in a methodology-free setting, a two-parameter family of dynamically rescaled blow-up profiles is considered, and it is shown that as soon as $β$ is greater than one, a new region in the parameter space is ruled out. More importantly, the region is a neighborhood (in the parameter space) of the self-similar profile, i.e., the approximately self-similar blow-up, a prime suspect in possible singularity formation, is ruled out for all HD NS models.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源