Abstract
Mathematical models of nonlinear cross diffusion are described by a system of nonlinear partial parabolic equations associated with nonlinear boundary conditions. Explicit analytical solutions of such nonlinearly coupled systems of partial differential equations are rarely existed and thus, several numerical methods have been applied to obtain approximate solutions. In this paper, based on a self-similar analysis and the method of standard equations, the qualitative properties of a nonlinear cross-diffusion system with nonlocal boundary conditions are studied. We are constructed various self-similar solutions to the cross diffusion problem for the case of slow diffusion. It is proved that for certain values of the numerical parameters of the nonlinear cross-diffusion system of parabolic equations coupled via nonlinear boundary conditions, they may not have global solutions in time. Based on a self-similar analysis and the comparison principle, the critical exponent of the Fujita type and the critical exponent of global solvability are established. Using the comparison theorem, upper bounds for global solutions and lower bounds for blow-up solutions are obtained.
Highlights
We studied the qualitative properties of solutions of a nonlinear cross-diffusion system associated with nonlocal boundary conditions
The purpose of this study is to find the conditions of existence and nonexistence of solutions to problem (1) (3) over time based on self-similar analysis
Theorem 3 shows that the critical exponents of the global existence of a solution are q10 1, q20 1
Summary
We studied the qualitative properties of solutions of a nonlinear cross-diffusion system associated with nonlocal boundary conditions Under the different condition on the cross-diffusion flow, or the initial values u0 and 0 was obtained the global existence [25,26,27]. By the many authors the condition for the global existence of solutions and the condition for the occurrence of a blow-up regime for various boundary value problems have been intensively studied (see [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]).
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