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arXiv 1903.09396math.AP
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具有撕裂密度的可压缩Navier-斯托克斯方程

Compressible Navier-Stokes equations with ripped density

Raphaël Danchin, Piotr Boguslaw Mucha

摘要:

本文证明了在体积(体积)粘性系数足够大的条件下,二维可压缩Navier-斯托克斯方程速度场解的Sobolev正则性的全时传播性.初始速度可以任意大,初始密度只需有界即可。特别地,可以将集合的特征函数视为初始密度。在理想气体的情况下,给出了方程解的唯一性。作为我们结果的副产品,我们给出了一个严格的理由收敛到非齐次不可压Navier-斯托克斯方程时,体积粘度趋于无穷大。在三维情况下,证明了类似的结果,在一些标度不变的速度场的小条件。

英文摘要:

Here we prove the all-time propagation of the Sobolev regularity for the velocity field solution of the two-dimensional compressible Navier-Stokes equations, provided the volume (bulk) viscosity coefficient is large enough. The initial velocity can be arbitrarily large and the initial density is just required to be bounded. In particular, one can consider a characteristic function of a set as an initial density. Uniqueness of the solutions to the equations is shown, in the case of a perfect gas. As a by-product of our results, we give a rigorous justification of the convergence to the inhomogeneous incompressible Navier-Stokes equations when the volume viscosity tends to infinity. Similar results are proved in the three-dimensional case, under some scaling invariant smallness condition on the velocity field.

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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