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arXiv 1907.01065math.AP
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具有真空边界的变熵非等熵可压缩Euler方程解的整体存在性

Global existence of the nonisentropic compressible Euler equations with vacuum boundary surrounding a variable entropy state

Calum Rickard, Mahir Hadzic, Juhi Jang

摘要:

通过对一类背景非等熵仿射运动的扰动,证明了具有真空边界的非等熵可压缩Euler方程组解的整体存在性,其中方程组的绝热常数为$γ> 1$.非等熵运动的显著特点是存在非常数熵,这给非等熵仿射运动的稳定性分析带来了新的数学挑战。特别是,旋度项的估计需要仔细使用的代数,非线性结构的压力。有了适当的规律性的基本仿射熵,我们能够适应的加权能量方法开发的等熵欧拉Hadžić和Jang的非等熵问题。对于大的$γ$值,受Shkoller和Sideris的启发,我们使用时间相关的权重,允许一些高阶范数随着时间变量趋于无穷大而潜在地增长。我们还利用的时间变量的基本定理微积分的范数不是最高阶的估计。

英文摘要:

Global existence for the nonisentropic compressible Euler equations with vacuum boundary for all adiabatic constants $γ> 1$ is shown through perturbations around a rich class of background nonisentropic affine motions. The notable feature of the nonisentropic motion lies in the presence of non-constant entropies, and it brings a new mathematical challenge to the stability analysis of nonisentropic affine motions. In particular, the estimation of the curl terms requires a careful use of algebraic, nonlinear structure of the pressure. With suitable regularity of the underlying affine entropy, we are able to adapt the weighted energy method developed for the isentropic Euler by Hadžić and Jang to the nonisentropic problem. For large $γ$ values, inspired by Shkoller and Sideris, we use time-dependent weights that allow some of the top-order norms to potentially grow as the time variable tends to infinity. We also exploit coercivity estimates here via the fundamental theorem of calculus in time variable for norms which are not top-order.

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