PM Pure Mathematics 2160-7583 Scientific Research Publishing 10.12677/PM.2015.52009 PM-14934 PM20150200000_65285375.pdf 数学与物理 多重非线性抛物方程组解的爆破 Blowup of Solutions for a Class of Doubly Nonlinear Parabolic Equations 2 1 龙飞 2 1 青英 2 1 河南工业大学理学院,河南 郑州 null 02 03 2015 05 02 59 65 © Copyright 2014 by authors and Scientific Research Publishing Inc. 2014 This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

本文研究了一类多重非线性抛物方程组解的爆破,利用修正的Levine凸性方法,对齐次Dirichlet边界和非线性项和初始条件的适当条件下,给出了解爆破时间的充分条件。
This paper is concerned with a class of doubly nonlinear parabolic systems. Under the homogeneous Dirichlet conditions and suitable conditions on the nonlinearity and certain initial datum, a sufficient condition for finite time blowup of its solution in a bounded domain is gave by using a modification of Levine’s concavity method.

爆破,多重非线性抛物方程组,Levine凸性方法, Blowup of Solution Doubly Nonlinear Parabolic Equations Levine’s Concavity Method
多重非线性抛物方程组解的爆破<sup> </sup>

苏璟,齐龙飞,呼青英

河南工业大学理学院,河南 郑州

Email: slxhqy@163.com

收稿日期:2015年2月27日;录用日期:2015年3月8日;发布日期:2015年3月12日

摘 要

本文研究了一类多重非线性抛物方程组解的爆破,利用修正的Levine凸性方法,对齐次Dirichlet边界和非线性项和初始条件的适当条件下,给出了解爆破时间的充分条件。

关键词 :爆破,多重非线性抛物方程组,Levine凸性方法

1. 引言

本文研究如下非线性抛物方程组解的爆破性

其中 上的有界区域且有光滑边界 上的Laplace 算子, 为以后给定的函数。

型如(1.1)的单个多重非线性抛物方程

就是经典的所谓双非线性抛物方程,这类方程可以描述诸多化学反应、热传导过程和种群动力学过程(详细见文献[ 1 ] )。方程(1.5)的初值问题或初边值问题已经有许多文献研究其局部和整体可解性[ 2 ] -[ 6 ] ,文献[ 7 ] -[ 12 ] 则研究了其整体吸引子的存在性和正则性。最近几十年,该类非线性抛物方程的爆破问题吸引了许多人的注意,基于Levine [ 13 ] [ 14 ] 凸性方法这一开创性的证明爆破的结果,Iami和Mochizuki [ 15 ] 则给出了方程(1.5)带Neumann初边值问题解爆破的充分条件,该凸性方法还被Levine [ 16 ] [ 17 ] 用于如下渗流方程

Sacks [ 18 ] 研究了如下包含方程解的爆破问题

Zhang [ 19 ] 和Ding和Guo [ 20 ] -[ 22 ] 通过构造适当的辅助函数,利用一阶微分不等式考虑了下面带梯度项和Neumann (或Robin)初边值问题解的爆破条件

Korpusou和Sveshnikov [ 23 ] [ 24 ] 给出了如下方程初边值问题弱解爆破的充分条件

最后,还应提及Ouardi和 Hachimi [ 25 ] [ 26 ] 研究了如下多重非线性抛物方程组

得到了其整体吸引子的存在性和正则性以及Hausdorff维数估计。

本文用修正的Levine凸性方法证明问题(1.1)~(1.4)的解在有限时刻爆破,该方法比原始的Levine凸性方法更简洁,其基本技巧是Korpousov [ 24 ] 给出的一个微分不等式,本文把[ 24 ] 的方法用于多重非线性抛物方程组。据作者所知,关于多重非线性抛物方程组的爆破问题的研究还比较少。本文的安排如下:第二节将给出一些假设和基本引理,第三节给出主要结果和证明。

2. 假设和基本引理

本文用 表示通常的Soblev空间,其范数分别记为 ,特别是当 时,记 ,这些符号的含义和记法同文献[ 2 ] 。

本文始终假设 。关于非线性项 , 的假设如下:

(A1) ,存在函数 使得

且存在常数 使得

,

其中, 时, 时。

注:满足条件(A1)的函数是存在的。事实上,一个典型的例子是取

,即

,

,

这时, ,其中 , 。该例的详细情况可见文献[ 27 ] 。

利用Galerkin方法,结合单调性理论和紧性方法[ 2 ] ,类似文献[ 24 ] 可得问题(1.1)~(1.4)解的局部存在性。

定理2.1:假设条件(A1)成立, ,则问题(1.1)~(1.4)存在弱解 ,即,存在 使得

, , .

且对任意 成立:

以及

下面给出本文的基本引理。

引理2.2 [ 13 ] [ 24 ] [ 28 ] :设 是R上非负二次连续可导函数且满足不等式

其中 为常数。若 ,则必存在时刻 ,使当 时有 ,其中

3. 主要结果及证明

首先引入泛函

现给出主要引理。

引理3.1:对任意 ,下面不等式成立

证明 注意到

而由Holder不等式得

考虑到(3.7)~(3.10),则由(3.6)得

再利用不等式

,

于是,引理得证。

下面,给出主要定理。

定理3.2:设定理2.1的条件成立, 且

则问题(1.1)~(1.4)的弱解 必在某有限时刻 爆破,即

证明:方程(1.1),(1.2)两边分别同乘 ,然后关于x积分并相加,得

方程(1.1),(1.2)两边分别同乘 ,然后关于x积分并相加,得

(3.13)关于t积分得

再利用条件(A1)得

(3.12)结合(3.15),并用到 ,得

注意到

利用引理3.1,得

其中

如果 ,由(3.1),(3.6)和(3.11)知

, ,

于是,由引理2.2得结论。如果 ,取 ,则(3.18)变为

于是,由标准的凸性引理得结论。

文章引用

苏 璟,齐龙飞,呼青英, (2015) 多重非线性抛物方程组解的爆破Blowup of Solutions for a Class of Doubly Nonlinear Parabolic Equations. 理论数学,02,59-65. doi: 10.12677/PM.2015.52009

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