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arXiv 1902.11166math.AP
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二维可压缩Navier-斯托克斯方程平面稀疏波的消失粘性极限

Vanishing viscosity limit to the planar rarefaction wave for the two-dimensional compressible Navier-Stokes equations

Lin-An Li, Dehua Wang, Yi Wang

摘要:

研究了二维可压缩等熵Navier-斯托克斯方程在相应的二维无粘Euler方程存在平面稀疏波解的情况下的粘性消失极限.证明了二维可压缩Navier-斯托克斯方程存在一族光滑解收敛到二维Euler方程任意强度的平面稀疏波解。在远离初始时刻的粘性系数的意义下,得到了一致收敛性。在证明中,为了严格证明粘性极限消失的合理性,我们引入了双曲波来恢复无粘稀疏波剖面的物理粘性。

英文摘要:

The vanishing viscosity limit of the two-dimensional (2D) compressible isentropic Navier-Stokes equations is studied in the case that the corresponding 2D inviscid Euler equations admit a planar rarefaction wave solution. It is proved that there exists a family of smooth solutions for the 2D compressible Navier-Stokes equations converging to the planar rarefaction wave solution with arbitrary strength for the 2D Euler equations. A uniform convergence rate is obtained in terms of the viscosity coefficients away from the initial time. In the proof, the hyperbolic wave is crucially introduced to recover the physical viscosities of the inviscid rarefaction wave profile, in order to rigorously justify the vanishing viscosity limit.

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