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# A Remark on the Blowup of Solutions to the Laplace Equations with Nonlinear Dynamical Boundary Conditions

*Boundary Value Problems*
**volume 2010**, Article number: 203248 (2010)

## Abstract

We present some sufficient conditions of blowup of the solutions to Laplace equations with semilinear dynamical boundary conditions of hyperbolic type.

## 1. Introduction

Let be a bounded domain of with a smooth boundary where and are closed and disjoint and possesses positive measure. We consider the following problem:

where are constants, is the Laplace operator with respect to the space variables, and is the outer unit normal derivative to boundary . are given initial functions. For convenience, we take in this paper.

The problem (1.1)–(1.4) can be used as models to describe the motion of a fluid in a container or to describe the displacement of a fluid in a medium without gravity; see [1–5] for more information. In recent years, the problem has attracted a great deal of people. Lions [6] used the theory of maximal monotone operators to solve the existence of solution of the following problem:

Hintermann [2] used the theory of semigroups in Banach spaces to give the existence and uniqueness of the solution for problem (1.5)–(1.7). Cavalcanti et al. [7–11] studied the existence and asymptotic behavior of solutions evolution problem on manifolds. In this direction, the existence and asymptotic behavior of the related of evolution problem on manifolds has been also considered by Andrade et al. [12, 13], Antunes et al. [14], Araruna et al. [15], and Hu et al. [16]. In addition, Doronin et al. [17] studied a class hyperbolic problem with second-order boundary conditions.

We will consider the blowup of the solution for problem (1.1)–(1.4) with nonlinear boundary source term . Blowup of the solution for problem (1.1)–(1.4) was considered by Kirane [3], when , by use of Jensen's inequality and Glassey's method [18]. Kirane et al. [19] concerned blowup of the solution for the Laplace equations with a hyperbolic type dynamical boundary inequality by the test function methods. In this paper, we present some sufficient conditions of blowup of the solutions for the problem (1.1)–(1.4) when is a bounded domain and can be a nonempty set. We use a different approach from those ones used in the prior literature [3, 19].

Another related problem to (1.1)–(1.4) is the following problem:

Amann and Fila [20], Kirane [3], and Koleva and Vulkov [21] Vulkov [22] considered blowup of the solution of problem (1.8)–(1.10). For more results concerning the related problem (1.8)–(1.10), we refer the reader to [3, 6, 19–31] and their references. In these papers, existence, boundedness, asymptotic behavior, and nonexistence of global solutions for problem (1.8)–(1.10) were studied.

In this paper, the definition of the usually space can be found in [32] and the norm of is denoted by .

## 2. Blowup of the Solutions

In this paper, we always assume that the initial data , and and that the problem (1.1)–(1.4) possesses a unique local weak solution [2, 3, 6] that is, is in the class

and the boundary conditions are satisfied in the trace sense [2].

Lemma 2.1 (see [33]).

Suppose that and . Then, .

Theorem 2.2.

Suppose that is a weak solution of problem (1.1)–(1.4) and satisfies:

(1)

(2)

where . Then, the solution of problem (1.1)–(1.4) blows up in a finite time.

Proof.

Denote

then from (1.1)–(1.4), we have

Hence

Let Using condition (1) of Theorem 2.2, we have

Observing that

we know from (2.5)–(2.7) that

It follows from (2.8) that

where From (2.8) and (2.10), we have

Using the inversion of the Hölder inequality, we obtain

Substituting (2.12) and (2.13) into (2.11), we have

Noticing that

we have

We see from (2.9) and (2.10) that as . Therefore, there is a such that

Multiplying both sides of (2.16) by and using (2.9), we get

where

From (2.18) we have

where Integrating (2.20) over , we arrive at

Observe that when , the right-hand side of (2.21) approaches to positive infinity since for sufficiently large ; hence, there is a such that the right side of (2.21) is larger than or equal to zero when . We thus have

Extracting the square root of both sides of (2.22) and noticing that , we obtain

since , where

Consider the following initial value problem of the Bernoulli equation:

Solving the problem (2.24), we obtain the solution

where Obviously, , and for

From (2.10), we see that

as Take sufficiently large such that It follows from (2.26) and the condition of Theorem 2.2 that

Therefore,

By virtue of the continuity of and the theorem of the intermediate values, there is a constant such that Hence, as It follows from Lemma 2.1 that Thus, as The theorem is proved.

Theorem 2.3.

Suppose that is a convex function, , where is a real number , and is a weak solution of problem (1.1)–(1.4)

where is the normalized eigenfunction (i.e., ) corresponding the smallest eigenvalue of the following Steklov spectral problem [23]:

where are defined as in Section 1. Then, the solution of problem (1.1)–(1.4) blows up in a finite time.

Proof.

Let

Then, . It follows from (1.1)–(1.4) that satisfies

Using Green's formula, we have

where we have used (2.31) and the fact that is the eigenfunction of the problem (1.1)–(1.4), and are denoted as the expressions in the first and the second parenthesis, respectively. From (2.32), we have

If , it is clear that otherwise, by (1.3) and (2.33),

Therefore, (2.36) implies that , that is,

Now, (2.35) takes the form

From Jensen's inequality and the condition , we have

Substituting the above inequality into (2.40), we get

Since , from the continuity of , it follows that there is a right neighborhood of the point , in which and hence If there exists a point such that but then is monotonically increasing on It follows from (2.42) that on

and thus is monotonically increasing on This contradicts . Therefore, and hence as .

Multiplying both sides of (2.42) by and integrating the product over , we get

Since and

then Extracting the square root of both sides of (2.44), we have

Equation (2.46) means that the interval of the existence of is finite this, that is,

and as . The theorem is proved.

Remark 2.4.

The results of the above theorem hold when one considers (1.1)–(1.4) with more general elliptic operator, like

and the corresponding boundary conditions

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## Acknowledgments

The authors are very grateful to the referee's suggestions and comments. The authors are supported by National Natural Science Foundation of China and Foundation of Henan University of Technology.

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Zhang, H., Hu, Q. A Remark on the Blowup of Solutions to the Laplace Equations with Nonlinear Dynamical Boundary Conditions.
*Bound Value Probl* **2010, **203248 (2010). https://doi.org/10.1155/2010/203248

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DOI: https://doi.org/10.1155/2010/203248

### Keywords

- Weak Solution
- Laplace Equation
- Maximal Monotone
- Maximal Monotone Operator
- Hyperbolic Type