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arXiv 0704.0759math.AP
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Euler方程的能量守恒和Onsager猜想

Energy conservation and Onsager's conjecture for the Euler equations

A. Cheskidov, P. Constantin, S. Friedlander, R. Shvydkoy

摘要:

Onsager指出,三维不可压缩流体的欧拉方程的弱解只有在具有一定的最小光滑度(1/3阶分数导数)时才能保持能量守恒,如果它们更粗糙,则会耗散能量。本文证明了函数空间$B^{1/3}_{3,c(\NN)}$中速度的能量守恒。我们表明,这个空间在自然意义上是尖锐的。我们短语的能量谱的Littlewood-Paley分解,并表明,能量通量是由当地的相互作用。这种局部性也适用于螺旋通量;此外,属于$B^{2/3}_{3,c(\NN)}$的欧拉方程的每一个弱解都保持螺旋性。相比之下,在二维中,强的局部性拟能只在紫外范围内。

英文摘要:

Onsager conjectured that weak solutions of the Euler equations for incompressible fluids in 3D conserve energy only if they have a certain minimal smoothness, (of order of 1/3 fractional derivatives) and that they dissipate energy if they are rougher. In this paper we prove that energy is conserved for velocities in the function space $B^{1/3}_{3,c(\NN)}$. We show that this space is sharp in a natural sense. We phrase the energy spectrum in terms of the Littlewood-Paley decomposition and show that the energy flux is controlled by local interactions. This locality is shown to hold also for the helicity flux; moreover, every weak solution of the Euler equations that belongs to $B^{2/3}_{3,c(\NN)}$ conserves helicity. In contrast, in two dimensions, the strong locality of the enstrophy holds only in the ultraviolet range.

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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