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Blow-up criteria for a two-fluid model of the truncated Euler equations
Journal of Inequalities and Applications volume 2013, Article number: 461 (2013)
In this paper, we study a two-fluid model of the truncated Euler equations with partial viscosity. We obtain new blow-up criteria for a solution of the system in terms of vorticity in the homogeneous Besov space .
1 Introduction and main results
In this paper, we are concerned with the regularity of the following two-fluid model of the truncated Euler equations with partial viscosity:
where denotes the fluid velocity vector field, is the scalar pressure, , while and are given initial velocity and initial temperature, respectively, with . For more detailed background of the system, we refer the readers to  and the references therein. When , the system reduces to the well-known Navier-Stokes equations.
It is well known that the question of global existence or finite time blow-up of smooth solutions for the 3D incompressible Navier-Stokes equations is still unsolved. This challenging problem has attracted significant attention. Therefore, it is interesting to study the blow-up criterion of the solutions for system (1.1). Recently, Sun and Fan  first proved the following blow-up criterion for system (1.1):
Our purpose in this paper is to establish blow-up criteria of a strong solution for the two-fluid model of the truncated Euler equations in terms of vorticity in the homogeneous Besov space . The main difficulty is without viscosity in the second equation for system (1.1).
Now we state our main results as follows.
Theorem 1.1 Let , be a strong solution to system (1.1) with the initial data for . If the solution u satisfies the following condition:
then the solution can be extended smoothly beyond .
2 Preliminaries and lemmas
Throughout this paper, we introduce some function spaces, notations and important inequalities.
Let denote the heat semigroup defined by
for and , where ∗ denotes the convolution of functions defined on .
We now recall the definition of the homogeneous Besov space with negative indices on and the homogeneous Sobolev space of exponent . It is known (p.192 of Ref. ) that belongs to if and only if for all and . The norm of is defined, up to equivalence, by
We introduce now the homogeneous Sobolev space , which is defined as the set of functions , such that . This space is endowed with the norm
and when , we just let .
Lemma 2.1 
Let and . Then there exists a constant depending only on α, p and q such that the estimate
holds for all .
In particular, for , and , we get and
Lemma 2.2 
For any function (), and , we have
and C is a constant independent of f.
3 Proof of the main results
In this section, we prove Theorem 1.1.
Proof of Theorem 1.1 First, we multiply the both sides of the first equation of (1.1) by u and the second equation of (1.1) by θ, respectively; after integration by parts over , we get
Next, we multiply the both sides of the first equation of (1.1) by ; after integration by parts over , we get
Using the Young inequality and adding (3.2) to (3.3), we obtain
It is easy to see that
where we use the Hölder inequality, the Young inequality and (2.2).
Putting (3.5) and (3.6) into (3.4) and applying the Gronwall inequality yields
Multiplying the both sides of the second equation of (1.1) by (), after integration by parts over , we deduce that
which implies that
Taking curl on the both sides of the first equation of (1.1), we obtain the following vorticity formulation for the vorticity field :
and then multiplying the both sides of the vorticity equation by (), after integration by parts over , we infer that
where . Using the Gronwall inequality, we obtain
which implies that
On the other hand, since u is a solution of the Stokes system
it follows from the -theory of the Stokes system that
Differentiating the second equation of (1.1) with respect to () and multiplying the resulting equation by , and then integrating by parts over , we get
By (3.12) and the Gronwall inequality, we have
We multiply the both sides of the equation of (3.8) by ; after integration by parts over , we get
the Gronwall inequality yields
In the following calculations, we use the following commutator estimate and bilinear estimate :
with , and . Taking the operation on both sides of the second equation of (1.1), then multiplying them by , and integrating by parts over , we have
Combining (3.12) with (3.14) and using the Gronwall inequality, we obtain
This completes the proof. □
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Research supported by the National Natural Science Foundation of China (11161041), the Fundamental Research Funds for the Central Universities (No. 31920130006) and Middle-Younger Scientific Research Fund (No. 12XB39).
The authors declare that they have no competing interests.
YX provided the model in the paper and some important references [1, 2]. He performed the some analysis work. HM and XF provided the ideas about blow-up criteria in terms of vorticity in the homogeneous Besov space and participated in the design of the study. LM mainly carried out inferences and computations of formulas in the paper. All authors read and approved the final manuscript.
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Xu, Y., Mao, H., Fan, X. et al. Blow-up criteria for a two-fluid model of the truncated Euler equations. J Inequal Appl 2013, 461 (2013). https://doi.org/10.1186/1029-242X-2013-461
- blow-up criterion
- truncated Euler equations
- Besov space