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arXiv 1202.0016math.AP
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一般临界Besov空间中全低马赫数极限系统的适定性

On the well-posedness of the full low-Mach number limit system in general critical Besov spaces

Raphaël Danchin, Xian Liao

摘要:

本文研究了由完全可压缩Navier-Stokes方程组得到的低马赫数极限方程组在全空间的适定性问题。在初始温度(或密度)接近于一个正常数的情况下,我们建立了临界齐次Besov空间中解的局部存在唯一性。如果,此外,初始速度是小的,那么我们表明,解决方案存在的所有积极的时间。在完全非齐次的情形下,我们建立了非齐次Besov空间(仍然具有临界正则性)中任意大的正初始温度数据的局部适定性。我们的分析强烈依赖于使用修改后的无发散速度,允许减少系统之间的非线性耦合的抛物型方程和一些进化的斯托克斯系统。Besov空间的温度和(修正)速度的勒贝格指数不需要相同。这使我们能够考虑具有负正则性指数的Besov空间中的初始数据。

英文摘要:

This work is devoted to the well-posedness issue for the low-Mach number limit system obtained from the full compressible Navier-Stokes system, in the whole space. In the case where the initial temperature (or density) is close to a positive constant, we establish the local existence and uniqueness of a solution in critical homogeneous Besov spaces. If, in addition, the initial velocity is small then we show that the solution exists for all positive time. In the fully nonhomogeneous case, we establish the local well-posedness in nonhomogeneous Besov spaces (still with critical regularity) for arbitrarily large data with positive initial temperature. Our analysis strongly relies on the use of a modified divergence-free velocity which allows to reduce the system to a nonlinear coupling between a parabolic equation and some evolutionary Stokes system. The Lebesgue exponents of the Besov spaces for the temperature and the (modified) velocity, need not be the same. This enables us to consider initial data in Besov spaces with a negative index of regularity.

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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