Eventual self-similarity of solutions for the diffusion equation with nonlinear absorption and a point source

Peter V. Gordon, Cyrill B. Muratov

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This paper is concerned with the transient dynamics described by the solutions of the reaction-diffusion equations in which the reaction term consists of a combination of a superlinear power-law absorption and a time-independent point source. In one space dimension, solutions of these problems with zero initial data are known to approach the stationary solution in an asymptotically self-similar manner. Here we show that this conclusion remains true in two space dimensions, while in three and higher dimensions the same conclusion holds true for all powers of the nonlinearity not exceeding the Serrin critical exponent. The analysis requires dealing with solutions that contain a persistent singularity and involves a variational proof of existence of ultra-singular solutions, a special class of self-similar solutions in the considered problem.

Original languageEnglish (US)
Pages (from-to)2903-2916
Number of pages14
JournalSIAM Journal on Mathematical Analysis
Volume47
Issue number4
DOIs
StatePublished - 2015

All Science Journal Classification (ASJC) codes

  • Analysis
  • Computational Mathematics
  • Applied Mathematics

Keywords

  • Diffusion-absorption
  • Morphogen gradients
  • Self-similarity
  • Source-sink models

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