Focusing solutions of porous medium equations with reaction

    Authors

    Y. W. Qi

    Comments

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    Abbreviated Journal Title

    Nonlinear Anal.-Theory Methods Appl.

    Keywords

    focusing self-similar solutions; porous medium equation of reaction; Cauchy problem; DIFFUSION; Mathematics, Applied; Mathematics

    Abstract

    In this paper we study the existence of focusing solution to a class of porous medium equations taking the form u(t) = Delta u(m) + F(x, u, del u), where m > 1. Focusing solution has the property that its initial distribution is in the exterior of a finite domain. That is, there is a hole in the support of initial value, and in finite time T the hole disappears. We show there exists a focusing solution for a number of important models in physics and biology. Such solution is an example of a self-similar solution of the second kind. That is, the similarity variables cannot be determined a priori from dimensional consideration. Furthermore, it serves the purpose of supplying concrete bounds for the optimal regularity of general solutions of the equation. The P-Laplacian counterpart of this equation is also studied. (c) 2005 Elsevier Ltd. All rights reserved.

    Journal Title

    Nonlinear Analysis-Theory Methods & Applications

    Volume

    62

    Issue/Number

    7

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    1207

    Last Page

    1224

    WOS Identifier

    WOS:000231196600003

    ISSN

    0362-546X

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