Un résultat de décroissance des poches de tourbillon axisymétriques
Uncertainty quantification for data assimilation in a steady incompressible Navier-Stokes problem
The reliable and effective assimilation of measurements and numerical simulations in engineering applications involving computational fluid dynamics is an emerging problem as soon as new devices provide more data. In this paper we are mainly driven by hemodynamics applications, a field where the progressive increment of measures and numerical tools makes this problem particularly up-to-date. We adopt a Bayesian approach to the inclusion of noisy data in the incompressible steady Navier-Stokes equations...
Une contribution a l'etude de la couche limite magnetohydrodynamique d'un ecoulement de revolution en regime non stationnaire
Une méthode du type caractéristique pour la résolution d'un problème de lubrification hydrodynamique en régime transitoire
Unicité dans des solutions du système de Navier-Stokes : cas des domaines lipschitziens
On prouve l’unicité des solutions du système de Navier-Stokes incompressible dans , où est un domaine lipschitzien borné de ().
Unicité dans L3(R3) et d'autres espaces fonctionnels limites pour Navier-Stokes.
The main result of this paper is the proof of uniqueness for mild solutions of the Navier-Stokes equations in L3(R3). This result is extended as well to some Morrey-Campanato spaces.
Uniform in discretization error estimates for convection dominated convection-diffusion problems
Uniformly stable mixed hp-finite elements on multilevel adaptive grids with hanging nodes
We consider a family of quadrilateral or hexahedral mixed hp-finite elements for an incompressible flow problem with Qr-elements for the velocity and discontinuous -elements for the pressure where the order r can vary from element to element between 2 and an arbitrary bound. For multilevel adaptive grids with hanging nodes and a sufficiently small mesh size, we prove the inf-sup condition uniformly with respect to the mesh size and the polynomial degree.
Uniqueness of weak solutions of the Navier-Stokes equations
Consider the Navier-Stokes equation with the initial data . Let and be two weak solutions with the same initial value . If satisfies the usual energy inequality and if where is the multiplier space, then we have .
Uniqueness of weak solutions to a Keller-Segel-Navier-Stokes model with a logistic source
We prove a uniqueness result of weak solutions to the Cauchy problem of a Keller-Segel-Navier-Stokes system with a logistic term.
Uniqueness results for some PDEs
Existence of solutions to many kinds of PDEs can be proved by using a fixed point argument or an iterative argument in some Banach space. This usually yields uniqueness in the same Banach space where the fixed point is performed. We give here two methods to prove uniqueness in a more natural class. The first one is based on proving some estimates in a less regular space. The second one is based on a duality argument. In this paper, we present some results obtained in collaboration with Pierre-Louis...
Unsteady flow of a radiating gas between concentric cylinders
Unsteady incompressible boundary layer equation in full two and two-once localized parametric approximation.
Unsteady motion around a uniformly deforming rotating cylinder
Validation of numerical simulations of a simple immersed boundary solver for fluid flow in branching channels
This work deals with the flow of incompressible viscous fluids in a two-dimensional branching channel. Using the immersed boundary method, a new finite difference solver was developed to interpret the channel geometry. The numerical results obtained by this new solver are compared with the numerical simulations of the older finite volume method code and with the results obtained with OpenFOAM. The aim of this work is to verify whether the immersed boundary method is suitable for fluid flow in channels...
Vanishing viscosity limit for an expanding domain in space
Verallgemeinerung des Problems von dem ruhenden Ellipsoid in einer bewegten, unendlichen Flüssigkeit
Verallgemeinerung des Problems von den Bewegungen, welche in einer ruhenden, unelastischen Flüssigkeit die Bewegung eines Ellipsoids hervorbringt
Very weak solutions of the stationary Stokes equations in unbounded domains of half space type
We consider the theory of very weak solutions of the stationary Stokes system with nonhomogeneous boundary data and divergence in domains of half space type, such as , bent half spaces whose boundary can be written as the graph of a Lipschitz function, perturbed half spaces as local but possibly large perturbations of , and in aperture domains. The proofs are based on duality arguments and corresponding results for strong solutions in these domains, which have to be constructed in homogeneous...
Viscous damping of gravity waves over a permeable bed.