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arXiv 0910.3136math.AP
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物理真空中一维可压缩运动边界Euler方程在光滑函数空间中的适定性

Well-posedness in smooth function spaces for the moving-boundary 1-D compressible Euler equations in physical vacuum

Daniel Coutand, Steve Shkoller

摘要:

具有移动物理真空边界的自由边界可压缩一维Euler方程组是一个特征的退化双曲型守恒律方程组。物理真空奇点(或简并率)要求声速$c= γρ^{γ-1}$与到真空边界距离的平方根成比例,近年来引起了人们的极大关注。我们建立了这个系统的唯一解的存在性在一个很短的时间间隔,这是光滑的(在索伯列夫空间)所有的方式移动边界。证明是建立在一个新的高阶Hardy型不等式结合近似的欧拉方程组成的一个特定的退化抛物正则化。我们的正则解可以看作是退化的黏性解。

英文摘要:

The free-boundary compressible 1-D Euler equations with moving physical vacuum boundary are a system of hyperbolic conservation laws which are both characteristic and degenerate. The physical vacuum singularity (or rate-of-degeneracy) requires the sound speed $c= γρ^{γ-1}$ to scale as the square-root of the distance to the vacuum boundary, and has attracted a great deal of attention in recent years. We establish the existence of unique solutions to this system on a short time-interval, which are smooth (in Sobolev spaces) all the way to the moving boundary. The proof is founded on a new higher-order Hardy-type inequality in conjunction with an approximation of the Euler equations consisting of a particular degenerate parabolic regularization. Our regular solutions can be viewed as degenerate viscosity solutions.

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