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arXiv 2604.09640math.AP
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Navier-Stokes方程弱奇异性转变时间研究

Transition Time for Weak Singularities of the Navier-Stokes Equations

Chio Chon Kit

AI总结:

本文通过结合Leray弱解的能量恒等式与奇异性判据,推导出层流-湍流转变特征时间的解析表达式,揭示了层流湍流转变由Leray弱解的局部正则性崩溃主导,而非全局粘性扩散。

摘要:

本文构建了研究由不可压缩Navier-Stokes方程弱奇异性引发的层流-湍流转变的严格数学框架。通过整合Leray弱解的能量恒等式与奇异性判据∥u∥_{H^1_0(Ω)}→0,推导出层流-湍流转变特征时间的闭合解析表达式。理论标度t_{trans}∼ν/U²(等价于t_{trans}∼t_c/Re)被验证与剪切流的经典实验观测一致。本文揭示层流-湍流转变由Leray弱解的局部正则性崩溃主导,而非全局粘性扩散,并从NS方程弱奇异性角度提供了湍流起始的新理论解释。

英文摘要:

This paper constructs a rigorous mathematical framework for investigating laminar-turbulent transition induced by weak singularities of incompressible Navier-Stokes (NS) equations. By integrating the energy identity of Leray weak solutions with the singularity criterion $\left\lVert \boldsymbol{u} \right\rVert_{H_0^1(Ω)}\to0$, a closed analytical form of the laminar-turbulent transition characteristic time is derived. The theoretical scaling $t_{\text{trans}}\simν/U^2$ (equivalent to $t_{\text{trans}}\sim t_c/\text{Re}$) is verified to be consistent with classical experimental observations in shear flows. This work reveals that laminar-turbulent transition is dominated by the local regularity collapse of Leray weak solutions rather than global viscous diffusion, and provides a novel theoretical interpretation for the onset of turbulence from the perspective of NS equation weak singularities.

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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