Two dimensional subsonic flows with self-gravitation in bounded domain

Two dimensional subsonic flows with self-gravitation in bounded domain
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有界域内具有自引力的二维亚音速流

DOI:
10.1142/s0218202515500591
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发表时间:
2014-06
影响因子:
3.5
通讯作者:
Chunjing Xie
Chunjing Xie
中科院分区:
数学1区
文献类型:
--
作者:
Myoungjean Bae;Ben Duan;Chunjing Xie

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本文研究二维定常Euler-Poisson方程组,该方程组描述可压缩自引力流的运动。当给定入口熵和出口压力时,得到了有限长管道中亚音速流动的唯一存在性和稳定性。引入流函数后,Euler-Poisson方程组可分解为多个输运方程和一个二阶非线性椭圆方程组。我们发现了一个能量估计相关的椭圆系统,这是一个关键的成分,以证明亚音速流的唯一存在性和稳定性。
We investigate two dimensional steady Euler-Poisson system which describe the motion of compressible self-gravitating flows. The unique existence and stability of subsonic flows in a duct of finite length are obtained when prescribing the entropy at the entrance and the pressure at the exit. After introducing the stream function, the Euler-Poisson system can be decomposed into several transport equations and a second order nonlinear elliptic system. We discover an energy estimate for the associated elliptic system which is a key ingredient to prove the unique existence and stability of subsonic flow.
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