Méthodes de domaines ctifs d'ordre élevé pour les équations elliptiques et de Navier-Stokes- Application au couplage uide-structure High-order ctitious-domain methods for the elliptic and Navier-Stokes equations. Application to uid-structure coupling

de l’information, informatique Méthodes particulaires avec remaillage: analyse numérique, nouveaux schémas et applications pour la simulation d’équations de transport Thèse soutenue publiquement le 12 juillet 2011, devant le jury composé de:

The transport of a scalar in a turbulent flow is a central issue in many fields such as combustion, environmental flows or multiphase flows. The problem to solve consists in the coupling of the incompressible Navier-Stokes equations with an advection-diffusion equation. The ratio of the flow viscosity to the scalar diffusivity, called the Schmidt number, characterizes the dynamics of this model. For Schmidt numbers higher than one, the smallest turbulence length scale of the flow motion is larger than the one of the scalar fluctuations [1]. In these situations, the use of a multi-scale hybrid method is mandatory to avoid solving the flow at the smallest scale. In our calculations, both the flow and scalar solvers rely on remeshed particle methods. These semi-Lagrangian methods were originally designed for advection dominated prob-lems. Particle remeshing enables to preserve a regular particle distribution and to control the accuracy of the method [2]. High order remeshing kernels combined with dimensional splitting allows to derive methods which combine stability, even for large time-steps, high order of accuracy and affordable cost [3]. In practice, the two parts of the problem (flow and scalar solvers) are computed simul-

I want to thank Wolfgang Peters who has brought my attention to the literature on1 endogenous demographic change. Financial support from the Deutsche Forschungs-gemeinschaft through Sonderforschungsbereich SFB 303 is also gratefully acknowledged.

Discovery expedition began its exploration of the western territory acquired by the Louisiana Purchase. Forty years ago, Public Law 88-577, the Wilderness Act, was signed into law by President Johnson. These two events serve as historic markers on how quickly the “endless ” expanse of the American wilderness disappeared. In fact, the Lewis and Clark expedition was already encountering the vanguard of traders, trappers, and settlers moving into the West even before its return to St. Louis in 1806. In less than one hundred years, most of the lands traversed by the Corps were occupied by European settlers and ranchers, and the vast herds of wildlife that fed and clothed Native Americans, and the Lewis and Clark expedition itself, were almost gone. By the late 1800s, many Americans were expressing alarm about how rapidly the resources within the wilderness, as well as the wilderness itself, were vanishing. This alarm translated into a Golden Era of wilderness advocacy by the

ABSTRACT. This is a welcome addition to the literature on Henry George. Bryson seeks to "rehabilitate" George-by highlighting his major achievements, by explaining why academic economists have rejected or neglected him, and by showing how nonetheless George has had a major but little

for the state to acquire all land, with limited compensation. The state would then lease it by auction, but to actual users only. Wallace saw his kinship with Henry George, and opened doors to help George tour Britain as a speaker. For years their ideas were linked by friend and foe, and together had great

Ecologie trophique de la tortue verte Chelonia mydas dans les herbiers marins et algueraies du sud-ouest de l’océan Indien Soutenue publiquement le 12 Février 2010 devant la commission d’examen constituée de: Jean-Yves GEORGES Co-directeur de thèse

vortex level set method for the two-way coupling of an incompressible fluid with colliding rigid bodies Mathieu Coquerelle, Georges-Henri Cottet To cite this version: Mathieu Coquerelle, Georges-Henri Cottet. A vortex level set method for the two-way cou-pling of an incompressible fluid

where the equilibrium markups fall with city size. We then show that, due to excess entry triggered by such pro-competitive effects, the ‛golden rule’ of local public finance, i.e., the Henry George Theorem (HGT) , does not hold at the second best. We finally prove, within a more general framework