On abstract Barenblatt equations

نویسندگان

  • Caroline Bauzet
  • Guy Vallet
  • CAROLINE BAUZET
  • GUY VALLET
چکیده

In this paper we are interested in abstract problems of Barenblatt’s type. In a first part, we investigate the problem f (∂t u)+Au = g where f and A are maximal monotone operators and by assuming that A derives from a potential J . With general assumptions on the operators, we prove the existence of a solution. In the second part of the paper, we examine a stochastic version of the above problem: f [∂t (u− ∫ t 0 hdw)]+Au = 0 , with some restrictive assumptions on the data due principally to the framework of the Itô integral.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Best matching Barenblatt profiles are delayed

The growth of the second moments of the solutions of fast diffusion equations is asymptotically governed by the behavior of self-similar solutions. However, at next order, there is a correction term which amounts to a delay depending on the nonlinearity and on a distance of the initial data to the set of self-similar Barenblatt solutions. This distance can be measured in terms of a relative ent...

متن کامل

Fast diffusion equations: matching large time asymptotics by relative entropy methods

A non self-similar change of coordinates provides improved matching asymptotics of the solutions of the fast diffusion equation for large times, compared to already known results, in the range for which Barenblatt solutions have a finite second moment. The method is based on relative entropy estimates and a time-dependent change of variables which is determined by second moments, and not by the...

متن کامل

A Posteriori Error Estimates for Approximate Solutions of the Barenblatt-Biot Poroelastic Model

Abstract. We are concerned with the Barenblatt-Biott model in the theory of poroelasticity. We derive a guaranteed estimate of the difference between exact and approximate solutions expressed in a combined norm that encompasses errors for the pressure fields computed from the diffusion part of the model and errors related to stresses (strains) of the elastic part. Estimates do not contain gener...

متن کامل

Fine Asymptotics for Fast Diffusion Equations

We investigate the large–time asymptotics of fast diffusion equations, ut = ∆um, where 0 < m < 1. We calculate convergence to Barenblatt profiles with algebraic rates in the exponent interval (d − 2)/d < m < (d − 1)/d in dimensions d ≥ 2. We cover in this way the gap still existing in the literature concerning the rates of approach to a Barenblatt profile, which have been recently obtained for ...

متن کامل

Convergence to the Barenblatt Solution for the Compressible Euler Equations with Damping and Vacuum

We study the asymptotic behavior of a compressible isentropic flow through a porous medium when the initial mass is finite. The model system is the compressible Euler equation with frictional damping. As t → ∞, the density is conjectured to obey the well-known porous medium equation and the momentum is expected to be formulated by Darcy’s law. In this paper, we give a definite answer to this co...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2011