## Nonlinear Partial Differential Equations in Mathematics and Physics

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Huafei Di, Yadong Shang, "Blow-Up of Solutions for a Class of Nonlinear Pseudoparabolic Equations with a Memory Term", *Abstract and Applied Analysis*, vol. 2014, Article ID 507494, 7 pages, 2014. https://doi.org/10.1155/2014/507494

# Blow-Up of Solutions for a Class of Nonlinear Pseudoparabolic Equations with a Memory Term

**Academic Editor:**BoQing Dong

#### Abstract

We consider the nonlinear pseudoparabolic equation with a memory term , , , with an initial condition and Dirichlet boundary condition. Under negative initial energy and suitable conditions on *p*, , and the relaxation function , we prove a finite-time blow-up result by using the concavity method.

#### 1. Introduction

In this paper, we consider the initial boundary value problem for a class of nonlinear pseudoparabolic equations with a memory term: where is a bounded domain with a smooth boundary , is a given continuous function, , , and are all real constant parameters, , and is the so-called -Laplace operator. This type of equations describes a variety of important physical processes, such as the analysis of heat conduction in materials with memory, electric signals in nonlinear telegraph line with nonlinear damping, viscous flow in materials with memory [1], vibration of nonlinear elastic rod with viscosity [2], nonlinear bidirectional shallow water waves [3], and the velocity evolution of ion-acoustic waves in a collisionless plasma when an ion viscosity is invoked [4].

Equation (1) includes many important mathematical physics models.

In the absence of the memory term, the viscous term, and -Laplace operator term , the model reduces to semilinear parabolic equation: On the existence, nonexistence, and the properties of solutions of (2), there have been many results [5–9].

In the absence of the memory term and -Laplace operator term , the model reduces to semilinear pseudoparabolic equation: Kaikina et al. [10] discussed the periodic boundary value problem of (3) under some assumption forms of nonlinear function . Cao et al. [11] investigated a class of periodic problems of pseudoparabolic type equations with nonlinear periodic sources. A rather complete classification of the exponent was given, in terms of the existence and nonexistence of nontrivial and nonnegative periodic solutions. Cao et al. [12] dealt with the Cauchy problem for semilinear pseudoparabolic equations. Existence and uniqueness of local solutions were proved, and the large-time behavior was investigated. Kaikina [13] and Xu and Su [14] discussed the initial boundary value problems of pseudoparabolic equation (3) under some classes of nonlinear function . They obtained some sufficient conditions of existence and uniqueness of local solutions and the large-time behavior of global solutions.

In the absence of the memory term and the viscous term , (1) becomes nonlinear parabolic equation with -Laplace nonlinear term: Tsutsumi [15] studied the initial boundary value problem of (4) with , where . He obtained the existence of global weak solutions by using the potential well method. Liu and Zhao [16] considered the same problem with critical initial conditions or and proved the existence of global solution for this problem. Xu et al. [17] discussed (4) at the high energy level, where if and if . They proved the finite time blow-up of solutions by the comparison principle and variational methods. Messaoudi in [18] considers an initial boundary value problem related to (4) and proves, under suitable conditions on , a blow-up result for solutions with vanishing or negative initial energy.

In the absence of the viscous term and -Laplace operator , Gripenberg [19] considered the nonlinear parabolic equation with Volterra integral term equation: He investigated the initial boundary value problem of (5) and established the global existence of a strong solution of the problem.

In the absence of the viscous term and -Laplace operator , as , the model reduces to the equation Yin [20] obtained the global existence of a classical solution of (7) under the assumption of a one-sided growth condition. Messaoudi [21] investigated a semilinear parabolic equation with the viscoelastic memory term. He established the finite time blow-up result for the solution with negative or vanishing initial energy for nonlinear function .

To the best of our knowledge, there are few works on the study of nonlinear pseudoparabolic equation with memory term of Volterra integral type. Shang and Guo [22–24] investigated the initial boundary value problem and initial value problem of the nonlinear pseudoparabolic equations with Volterra integral term: They proved the existence, uniqueness, and regularities of the global strong solution and gave some conditions of the nonexistence of global solution. In 2007, Ptashnyk [25] investigated the initial boundary value of degenerate quasilinear pseudoparabolic equations with memory term. He obtained some existence results of global solutions. Up to now, there are not any research works on the multidimensional nonlinear pseudoparabolic equations with memory term.

In the present work, we deal with the initial boundary problem of the nonlinear pseudoparabolic equation with the memory term of Volterra integral type, the damping term, and -Laplace operator: where is a bounded domain, is a given continuous function, , and is the so-called -Laplace operator. By using the concavity method first introduced by Levine [5], under negative initial energy and suitable conditions on , and the relaxation function , we prove that there exists finite-time blow-up solution.

Without loss of generality, we choose in the following discussion.

#### 2. Preliminaries and Main Results

In this section, we introduce some notations, basic definitions, and important lemmas which will be needed in this paper.

For functions defined on , we introduce

We now construct a space of functions as follows. Let denote the Sobolev space with the norm . denotes the class of functions with the compact support in . denotes the closure in of . The Hilbert space is a subspace of the Sobolev space .

The following are the basic hypotheses to establish the main results of this paper:(a);(b) is a function satisfying

To obtain the results of this paper, we will introduce the “modified” energy function: where The following lemma is similar to the lemma of [21] with slight modification.

Lemma 1. *Assume that (10) hold. Let p satisfy and let be a solution of (8). Then is nonincreasing function; that is
**
Moreover, the following energy inequality holds:
*

*Proof. *By multiplying the equation in (8) by , integrating over , we obtain
For the last term on the left side of (16),
Inserting (17) into (16), we have
for regular solution. The proof of Lemma 1 is completed. This result is valid for weak solutions by a simple density argument.

Now we consider the finite time blow-up of solutions with for the problem (8).

Theorem 2. *Let satisfy (a) and let the relaxation function be a function satisfying (10) and (11). Assume that such that . Then the solutions of the problem (8) blow up in finite time; that is, the maximum existence time of is finite and
*

*Proof. *The proof makes use of the so-called “concavity” arguments. For any , let
for .

A direct computation yields
By multiplying (8) with and integrating over ,
This implies that
and we have
where
Using Schwartz’s inequality, we have
By (26), we have
Thus,
where
For the third term on the left of (29), we have
By (29) and (30), we have
Using Lemma 1, we have
and then
Since
this implies that
where is a positive constant.

From the discussion above, we see that
From the definition of , there exists , such that
and we have
Thus,
Hence, this proves that reaches 0 in finite time as . Since is independent of , we may assume that .

This means
or
This implies that
Then, the desired assertion immediately follows.*Remark **1*. In the absence of the viscous term or -Laplace operator for the problem (8), the equation reduced to(1),
(2),
(3),
and from the process of the proof, we can see that the results of Theorem 2 still hold.

#### Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

#### Acknowledgments

This work is supported by the NSF of China (40890150 and 40890153) and the Scientific Program (2008B080701042) of Guangdong Province. The authors thank the anonymous referees for their helpful comments and suggestions.

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#### Copyright

Copyright © 2014 Huafei Di and Yadong Shang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.