Acta mathematica scientia,Series A ›› 2023, Vol. 43 ›› Issue (5): 1417-1426.

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Blow-Up Conditions of Porous Medium Systems with Gradient Source Terms and Nonlinear Boundary Conditions

Shen Xuhui1(),Ding Juntang2,*()   

  1. 1School of Applied Mathematics, Shanxi University of Finance and Economics, Taiyuan 030006
    2School of Mathematical Sciences, Shanxi University, Taiyuan 030006
  • Received:2022-07-14 Revised:2023-03-23 Online:2023-10-26 Published:2023-08-09
  • Contact: Juntang Ding E-mail:xhuishen@sxufe.edu.cn;djuntang@sxu.edu.cn
  • Supported by:
    NSFC(61473180);Youth Natural Science Foundation of Shanxi Province(20210302124533)

Abstract:

In this paper, we consider the blow-up of solutions to the following porous medium systems:

{ut=Δul+f(u,v,|u|2,t),vt=Δvm+g(u,v,|v|2,t),xΩ, t(0,t),uν=p(u), vν=q(v),xΩ, t(0,t),u(x,0)=u0(x), v(x,0)=v0(x),x¯Ω,

where l,m>1, ΩRN (N2) is a bounded domain with smooth boundary Ω. Using the differential inequality techniques and the maximum principles, we give a sufficient condition to ensure that the positive solution (u,v) of the above problem is a blow-up solution that blows up at a certain finite time t. An upper estimate of t and an upper estimate of the blow-up rate of (u,v) are also obtained.

Key words: Porous medium systems, Blow-up, Nonlinear boundary condition

CLC Number: 

  • O175.29
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