Initial-boundary value problem for equations of generalized Newtonian incompressible fluid.
Initial-boundary value problems for nonlinear pseudoparabolic equations in a critical case.
Instability of the stationary solutions of generalized dissipative Boussinesq equation
In this work we study the generalized Boussinesq equation with a dissipation term. We show that, under suitable conditions, a global solution for the initial value problem exists. In addition, we derive sufficient conditions for the blow-up of the solution to the problem. Furthermore, the instability of the stationary solutions of this equation is established.
Integration of the equations of gas dynamics for 2.5-dimensional solutions.
Interface cinétique / fluide : Un modèle simplifié
Interior regularity of weak solutions to the equations of a stationary motion of a non-Newtonian fluid with shear-dependent viscosity. The case
In this paper we consider weak solutions to the equations of stationary motion of a fluid with shear dependent viscosity in a bounded domain ( or ). For the critical case we prove the higher integrability of which forms the basis for applying the method of differences in order to get fractional differentiability of . From this we show the existence of second order weak derivatives of .
Invariant tensors and partial differential equations.
Inviscid limit for the 2-D stationary Euler system with arbitrary force in simply connected domains
We study the convergence in the vanishing viscosity limit of the stationary incompressible Navier-Stokes equation towards the stationary Euler equation, in the presence of an arbitrary force term. This requires that the fluid is allowed to pass through some open part of the boundary.
Irregular partially invariant solutions of rank 2 and defect 1 to equations of gas dynamics.
Justification of the method of approximation of solutions to contact problems of filtration theory.
Kink solutions of the binormal flow
I shall present some recent work in collaboration with S. Gutierrez on the characterization of all selfsimilar solutions of the binormal flow : which preserve the length parametrization. Above is a curve in , the arclength parameter, and denote the temporal variable. This flow appeared for the first time in the work of Da Rios (1906) as a crude approximation to the evolution of a vortex filament under Euler equation, and it is intimately related to the focusing cubic nonlinear Schrödinger...
-theory of boundary value problems for Sobolev type equations
-approach to weak solutions of the Oseen flow around a rotating body
We consider the time-periodic Oseen flow around a rotating body in ℝ³. We prove a priori estimates in -spaces of weak solutions for the whole space problem under the assumption that the right-hand side has the divergence form. After a time-dependent change of coordinates the problem is reduced to a stationary Oseen equation with the additional term -(ω ∧ x)·∇u + ω ∧ u in the equation of momentum where ω denotes the angular velocity. We prove the existence of generalized weak solutions in -space...
La méthode de l’entropie relative pour les limites hydrodynamiques de modèles cinétiques
La résolution des équations aux dérivées partielles dans les Opuscules mathématiques de D’Alembert (1761–1783)
Au regard de la première partie de son œuvre, D’Alembert est reconnu aujourd’hui comme le fondateur de la théorie des équations aux dérivées partielles. La résolution de ces équations dans le cadre de problèmes physico-mathématiques dans ses neuf tomes d’Opuscules mathématiques (1761–1783) reste cependant peu étudiée par les historiens. Nous examinons ici cette question à la lumière de ses recherches sur les cordes vibrantes et l’écoulement des fluides dans ce corpus tardif. Celles-ci nous permettent...
Large time behavior of a Cahn-Hilliard-Boussinesq system on a bounded domain.
Large time regular solutions to the MHD equations in cylindrical domains
We prove the large time existence of solutions to the magnetohydrodynamics equations with slip boundary conditions in a cylindrical domain. Assuming smallness of the L₂-norms of the derivatives of the initial velocity and of the magnetic field with respect to the variable along the axis of the cylinder, we are able to obtain an estimate for the velocity and the magnetic field in without restriction on their magnitude. Then the existence follows from the Leray-Schauder fixed point theorem.
Le problème des poches de tourbillon en dimension trois d'espace
Le Simulateur de la Terre
Les théorèmes de Leray et de Fujita-Kato pour le système de Boussinesq partiellement visqueux
Dans cet article, on étudie le système de Boussinesq décrivant le phénomène de convection dans un fluide incompressible et visqueux. Ce système est composé des équations de Navier-Stokes incompressibles avec un terme de force verticale dont l’amplitude est transportée sans dissipationpar le flot du champ de vitesses. On montre que les résultats classiques pour le système de Navier-Stokes standard demeurent vrais pour le système de Boussinesq bien qu’il n’y ait pas d’amortissement sur le terme de...