ON THE GLOBAL EXISTENCE OF SMOOTH SOLUTIONS TO THE MULTI-DIMENSIONAL COMPRESSIBLE EULER EQUATIONS WITH TIME-DEPENDING DAMPING IN HALF SPACE

Fei HOU

doi:10.1016/S0252-9602(17)30050-4

2017 , Vol. 37 >Issue 4: 949 - 964

DOI: https://doi.org/10.1016/S0252-9602(17)30050-4

Articles

ON THE GLOBAL EXISTENCE OF SMOOTH SOLUTIONS TO THE MULTI-DIMENSIONAL COMPRESSIBLE EULER EQUATIONS WITH TIME-DEPENDING DAMPING IN HALF SPACE

Fei HOU

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Department of Mathematics and IMS, Nanjing University, Nanjing 210093, China

Fei HOU,E-mail:houfeimath@gmail.com

Received date: 2016-06-28

Revised date: 2016-12-26

Online published: 2017-08-25

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Abstract

This paper is a continue work of[4, 5]. In the previous two papers, we studied the Cauchy problem of the multi-dimensional compressible Euler equations with time-depending damping term -(μ/(1+t)^λ)ρu, where λ ≥ 0 and μ > 0 are constants. We have showed that, for all λ ≥ 0 and μ > 0, the smooth solution to the Cauchy problem exists globally or blows up in finite time. In the present paper, instead of the Cauchy problem we consider the initialboundary value problem in the half space R₊^d with space dimension d=2, 3. With the help of the special structure of the equations and the fluid vorticity, we overcome the difficulty arisen from the boundary effect. We prove that there exists a global smooth solution for 0 ≤ λ < 1 when the initial data is close to its equilibrium state. In addition, exponential decay of the fluid vorticity will also be established.

Key words： compressible Euler equations; initial-boundary value problem; damping; global existence

Cite this article

Fei HOU . ON THE GLOBAL EXISTENCE OF SMOOTH SOLUTIONS TO THE MULTI-DIMENSIONAL COMPRESSIBLE EULER EQUATIONS WITH TIME-DEPENDING DAMPING IN HALF SPACE[J]. Acta mathematica scientia, Series B, 2017 , 37(4) : 949 -964 . DOI: 10.1016/S0252-9602(17)30050-4

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