A complete estimate on the localization for a porous medium type equation

A complete estimate on the localization for a porous medium type equation
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DOI:
10.1007/s00033-013-0354-9
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发表时间:
2014-08
期刊:
Zeitschrift für angewandte Mathematik und Physik
影响因子:
--
通讯作者:
Zhilei Liang;Shujuan Wang
Zhilei Liang;Shujuan Wang
中科院分区:
其他
文献类型:
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作者:
Zhilei Liang;Shujuan Wang

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本文研究了多孔介质方程u t = div (u σ∇u)) + u β, (x,t)∈rn × (0, t),其中σ> 0,β>σ+ 1,爆破时间<∞。由[5,7]可知,当初始函数有紧支撑时,解u(x,t)是局部化的。此外,在[5]中,如果β>σ+ 3,则部分推导出了初始支撑和爆破时间对局部化大小的估计。本文给出了所有β>σ+ 1的局部化的完整估计。
This paper is concerned with the porous medium equation u t = div ( u σ ∇ u ) + u β , ( x , t ) ∈ R N × ( 0 , T ) , whereσ>  0,β>σ+  1, and the blowing-up timeT<  ∞. It is shown in [5,7] that the solutionu(x,t) is localized in the case when the initial function has a compact support. In addition, an estimate on the size of the localization in terms of the initial support and the blowing-up timeTis partially derived in [5] ifβ>σ+  3. In this paper we give a complete estimate on the localization for allβ>σ+  1.