On the hierarchy and fine structure of blowups and gradient catastrophes for multidimensional homogeneous Euler equation

B. Konopelchenko, G. Ortenzi
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Abstract

Blowups of derivatives and gradient catastrophes for the n-dimensional homogeneous Euler equation are discussed. It is shown that, in the case of generic initial data, the blowups exhibit a fine structure in accordance of the admissible ranks of certain matrix generated by the initial data. Blowups form a hierarchy composed by n + 1 levels with the singularity of derivatives given by ∂ui/∂xk ∼ |δx|-(m+1)/(m+2), m = 1, . . . , n along certain critical directions. It is demonstrated that in the multi-dimensional case there are certain bounded linear superposition of blowup derivatives. Particular results for the potential motion are presented too. Hodograph equations are basic tools of the analysis.
论多维均质欧拉方程炸裂和梯度灾难的层次和精细结构
本文讨论了 n 维均相欧拉方程的导数炸裂和梯度灾难。结果表明,在一般初始数据的情况下,炸裂会根据初始数据生成的某些矩阵的可容许级数表现出一种单一结构。炸裂形成一个由 n + 1 级组成的层次结构,其导数的奇异性由 ∂ui/∂xk ∼ |δx|-(m+1)/(m+2), m = 1, . . ., n 沿某些临界方向。实验证明,在多维情况下,炸裂导数存在一定的有界线性叠加。此外,还给出了势运动的特定结果。霍多格方程是分析的基本工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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