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arXiv 0904.0434math.AP
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关于Prandtl方程的不适定性

On the ill-posedness of the Prandtl equation

David Gerard-Varet, Emmanuel Dormy

摘要:

本文研究Prandtl方程的Cauchy问题。已知这个问题对于解析数据或具有单调性的数据是适定的。本文证明了它在Sobolev型空间中是线性不适定的。分析的关键是在高切向频率处构造不稳定的准模,以便在具有非退化临界点的解周围进行线性化。有趣的是,强烈的不稳定性是由于粘性,这是一致的适定性结果获得的无粘版本的方程。还提供了这种不稳定性的数值研究。

英文摘要:

The concern of this paper is the Cauchy problem for the Prandtl equation. This problem is known to be well-posed for analytic data, or for data with monotonicity properties. We prove here that it is linearly ill-posed in Sobolev type spaces. The key of the analysis is the construction, at high tangential frequencies, of unstable quasimodes for the linearization around solutions with non-degenerate critical points. Interestingly, the strong instability is due to vicosity, which is coherent with well-posedness results obtained for the inviscid version of the equation. A numerical study of this instability is also provided.

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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