CONVERGENCE RATE OF SOLUTIONS TO STRONG CONTACT DISCONTINUITY FOR THE ONE-DIMENSIONAL COMPRESSIBLE RADIATION HYDRODYNAMICS MODEL

• Published in: Acta mathematica scientia 2016, Vol.36 (1), p.265-282
• Main Author: 陈正争 柴晓娟 王文娟
• Format: Article
• Language: English
• Subjects: 35L65; 58J45; contact discontinuity; convergence rate; energy estimates; radiation hydrodynamics model; singular limit; 一维; 可压缩; 奇异极限; 接触面; 收敛速度; 流体力学模型; 物理问题; 辐射通量
• ISSN: 0252-9602; 1572-9087
• DOI: 10.1016/S0252-9602(15)30094-1

This paper is concerned with a singular limit for the one-dimensional compress- ible radiation hydrodynamics model. The singular limit we consider corresponds to the physical problem of letting the Bouguer number infinite while keeping the Boltzmann number constant. In the case when the corresponding Euler system admits a contact discontinuity wave, Wang and Xie （2011） [12] recently verified this singular limit and proved that the solution of the compressible radiation hydrodynamics model converges to the strong contact 1 discontinuity wave in the L∞-norm away from the discontinuity line at a rate of ε1/4, as the reciprocal of the Bouguer number tends to zero. In this paper, Wang and Xie＇s convergence rate is improved to ε7/8 by introducing a new a priori assumption and some refined energy estimates. Moreover, it is shown that the radiation flux q tends to zero in the L∞-norm away from the discontinuity line, at a convergence rate as the reciprocal of the Bouguer number tends to zero.