Advances in Applied Mathematics
Vol.04 No.02(2015), Article ID:15213,6
pages
10.12677/AAM.2015.42018
Blowup of Solutions for a System of Doubly Nonlinear Degenerate Parabolic Equations with p-Laplacian
Longfei Qi, Jing Su, Qingying Hu
College of Science, Henan University of Technology, Zhengzhou Henan
Email: slxhqy@163.com
Received: Apr. 24th, 2015; accepted: May 7th, 2015; published: May 13th, 2015
Copyright © 2015 by authors and Hans Publishers Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).
http://creativecommons.org/licenses/by/4.0/
ABSTRACT
This paper is concerned with a system of doubly nonlinear degenerate parabolic equations with p-Laplacian. We prove that, under suitable conditions on the nonlinearity and certain initial datum, the lower bound for the blowup time is given if blowup does occur by using a modification of Levine’s concavity method.
Keywords:Blowup of Solution, Doubly Nonlinear Parabolic Equations, Levine’s Concavity Method
多重非线性退化的p-Laplacian抛物方程组解的爆破
齐龙飞,苏璟,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4月24日;录用日期:2015年5月7日;发布日期:2015年5月13日
摘 要
本文研究了一类多重非线性退化的p-Laplacian抛物方程组解的爆破,利用修正的Levine凸性方法,在非线性项和初始条件的适当条件下,给出了解爆破时间的下界。
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
(1.1)
(1.2)
(1.3)
(1.4)
其中是上的有界区域且有光滑边界,,,为以后给定的函数,为正的初始函数。
近几十年来,非线性抛物方程解的爆破问题引起人们的极大兴趣,考虑爆破性自然要研究解是否会爆破以及解的爆破时间,在这方面已经有大量的文献,如文献[1] -[5] 。问题(1.1)~(1.4)可以描述诸多化学反应、热传导过程和种群动力学过程(见文献 [6] - [17] 及其参考文献),它有多个非线性项,处理难度较大。对型如(1.1)的单个多重非线性抛物方程
(1.5)
已有许多结果,如文献 [6] - [10] 给出了方程(1.5)的初边值问题和初值问题局部和整体解的存在性,文献 [11] - [14] 则研究了其整体吸引子的存在性和正则性,类似方程(1.1),(1.2)的方程组问题的整体吸引子的存在性和正则性也有一些研究 [15] - [17] 。但关于该类问题解的爆破性研究则相对较少,Iami和Mochizuki [18] 给出了Neumann初边值条件下方程(1.5)的爆破条件,Levine [19] - [21] 则用凸性方法证明了单个方程(1.1)及其等价的如下问题解的爆破性
Korpusov和Sveshnikov [22] [23] 及Polat [24] 则对如下方程的初边值问题
在负初始能量时得到解的爆破条件。Wang和Ge [25] 及其参考文献则利用比较原理讨论了非线性边界时方程(1.1),(1.2)中非线性项为时解的爆破问题。
本文利用修正的Levine凸性方法讨论问题(1.1)~(1.4)解的爆破条件,推广了文献 [22] - [25] 的结果。在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. 假设和引理
本文所用符号均同文献 [6] ,记和为通常的Soblev空间,其范数分别记为和,特别是当时,记。
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,当时,当时。
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
且,即
这时, ,其中,。该例的详细情况可见文献 [26] 。
利用Galerkin方法,结合单调性理论和紧性方法 [2] ,类似文献 [27] 可得问题(1.1)~(1.4)解的局部存在性。
定理2.1. 假设条件(A1)成立且,,,则问题(1.1)~(1.4)存在弱解,即,存在使得
且对任意和任意分别的(或)成立:
以及。
下面给出本文的基本引理。
引理2.2. [5] [27] 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
(3.1)
(3.2)
(3.3)
(3.4)
现给出主要引理。
引理3.1. 对任意,下面不等式成立
(3.5)
证明 注意到
(3.6)
注意到由Holder不等式得下列不等式
(3.7)
(3.8)
考虑到(3.7)~(3.8),则由(3.6)得
再利用不等式
得
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
(3.9)
则问题(1.1)~(1.4)的弱解必在某有限时刻爆破,即
证明 注意到
由(3.1),得
把(1.1),(1.2)代入得
(3.10)
利用
由(3.2)及方程(1.1),(1.2)得
即
(3.11)
(3.11)关于t积分得
(3.12)
再利用条件(A1)得
(3.13)
(3.10)结合(3.13),并用到得
即
, (3.14)
注意到得
(3.15)
利用引理3.1,得
其中。
如果,由(3.1),(3.6)和(3.9)知,,于是,由引理2.2得结论。如果,取,则(3.15)变为
(3.16)
于是,由(3.16)和标准的凸性引理得结论。综合两种情况即得。
文章引用
齐龙飞,苏 璟,呼青英, (2015) 多重非线性退化的p-Laplacian抛物方程组解的爆破
Blowup of Solutions for a System of Doubly Nonlinear Degenerate Parabolic Equations with p-Laplacian. 应用数学进展,02,129-135. doi: 10.12677/AAM.2015.42018
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