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arXiv 1306.2580math.AP
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关于可压缩流的无真空牛顿模型的定常解

On steady solutions to vacuumless Newtonian models of compressible flow

Michał Łasica

摘要:

本文证明了正压情形下定常可压缩Navier-Stokes方程组在真空下奇异的一类压力定律的弱解的存在性。我们考虑R^2中有界区域上的问题,该问题具有滑移边界条件。由于证明中使用的近似解的适当构造,得到的密度是有界的远离0(和无穷大)。由于P. - L. Lions,这意味着密度和速度梯度至少是Hölder连续的,这对于存在真空的经典等熵模型通常不成立。

英文摘要:

We prove the existence of weak solutions to the steady compressible Navier-Stokes system in the barotropic case for a class of pressure laws singular at vacuum. We consider the problem in a bounded domain in R^2 with slip boundary conditions. Due to appropriate construction of approximate solutions used in proof, obtained density is bounded away from 0 (and infinity). Owing to a classical result by P.-L. Lions, this implies that density and gradient of velocity are at least Hölder continuous, which does not generally hold for the classical isentropic model in the presence of vacuum.

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