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2005, Volume 4, Issue 3: 523-536. Doi: 10.3934/cpaa.2005.4.523
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Non-simultaneous blow-up for a quasilinear parabolic system with reaction at the boundary

  • 1.

    Departamento de Matemáticas, U. Autónoma de Madrid, 28049 Madrid

  • 2.

    Departamento de Matemática, F.C.E y N. UBA (1428) Buenos Aires

Received:  September 2004
Revised:  February 2005
Published:  September 2005
Abstract Related Papers Cited by
    Abstract
  • We study a system of two porous medium type equations in a bounded interval, coupled at the boundary in a nonlinear way. Under certain conditions, one of its components becomes unbounded in finite time while the other remains bounded, a situation that is known in the literature as non-simultaneous blow-up. We characterize completely, in the case of nondecreasing in time solutions, the set of parameters appearing in the system for which non-simultaneous blow-up indeed occurs. Moreover, we obtain the blow-up rate and the blow-up set for the component which blows up. We also prove that in the range of exponents where each of the components may blow up on its own there are special initial data such that blow-up is simultaneous. Finally, we give conditions on the exponents which lead to non-simultaneous blow-up for every initial data.
    Mathematics Subject Classification: 35B33, 35K65, 35K55.

    Citation:
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