196 research outputs found
Global Behavior of Spherically Symmetric Navier-Stokes Equations with Density-Dependent Viscosity
In this paper, we study a free boundary problem for compressible spherically
symmetric Navier-Stokes equations without a solid core. Under certain
assumptions imposed on the initial data, we obtain the global existence and
uniqueness of the weak solution, give some uniform bounds (with respect to
time) of the solution and show that it converges to a stationary one as time
tends to infinity. Moreover, we obtain the stabilization rate estimates of
exponential type in -norm and weighted -norm of the solution by
constructing some Lyapunov functionals. The results show that such system is
stable under the small perturbations, and could be applied to the astrophysics.Comment: 38 page
Decay Estimates for Isentropic Compressible Navier-Stokes Equations in Bounded Domain
In this paper, under the hypothesis that is upper bounded, we
construct a Lyapunov functional for the multidimensional isentropic
compressible Navier-Stokes equations and show that the weak solutions decay
exponentially to the equilibrium state in norm. This can be regarded as a
generalization of Matsumura and Nishida's results in 1982, since our analysis
is done in the framework of Lions 1998 and Feireisl et al. 2001, the higher
regularity of and the uniformly positive lower bound of are
not necessary in our analysis and vacuum may be admitted. Indeed, the upper
bound of the density plays the essential role in our proof.Comment: 9 page
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