Jean-Paul Chabard

Électricité de France (EDF) | EDF · R&D

La communauté des hydrauliciens et celle du calcul scientifique sont attristées par le décès de André Daubert, survenu le 13 février 2020, à l'âge de 87 ans. André Daubert a joué un rôle éminent dans l'émergence de la simulation en hydraulique, à partir des années 1960. Il a joué ensuite un rôle très important dans le développement de l'informatiqu...

Cet ouvrage rassemble 58 problèmes résolus de mécanique des fluides, couvrant les notions générales, l'analyse dimensionnelle, les écoulements turbulents, les efforts sur les structures en régime permanent, les écoulements permanents et transitoires dans les canaux et rivières, les ondes de gravité, le transport des sédiments, les écoulements géoph...

This paper presents a review of recent applications of Computational Fluid Dynamics on problems dealing with power generation. Various turbulence models are used on different configurations involving heat transfer, ranging from Reynolds Averaged Navier-Stokes Equations (RANSE) with first or second order moment closure to Large Eddy Simulation (LES)...

Mécanique des Fluides Appliquée. By P. L. VIOLLET, J. P. CHABARD, P. ESPOSITO & D. LAURENCE. Presse des Ponts et Chaussées, 1998. 367 pp. ISBN 2 85978 301 6. - - Volume 413 - J. Piquet

Amongst the applications of CFD that EDF has to deal with, a large number are related to high temperature and/or variable density flows : these applications are for example related to the design of new industrial processes using electricity (plasma flows, electric arcs, heating using Joule effect) or to electricity production (pulverised coal burne...

The paper presents the strategy for the development of numerical models and software in EDF and CEA, for the computation of nuclear reactor single-phase thermal-hydraulics problems. These tools use the Navier-Stokes equations coupled with the k-ε model for turbulence, and have been validated upon simple situations of isothermal and non-isothermal f...

The paper presents the strategy for the development of numerical models and softwares in EDF and CEA, for the computation of nuclear reactor single-phase thermal-hydraulics problems. These tools use the Navier Stokes equations coupled with the k-lg3 model for turbulence, and have been validated upon simple situations of isothermal and non isotherma...

The aim of our work is to improve the understanding of flow distribution and determine the optimum set of hydraulic design parameters that favor the drilling fluid circulation, with both computations and experiments. Once a new bit design has been defined according to these criteria, field tests will he done for a final validation. This paper deals...

In order to solve industrial flow problems in complex geometries, a finite element code, N3S, has been developped at Electricité de France. For an incompressible unsteady flow, the Reynolds-averaged Navier-Stokes equations, with a k-ε turbulence modelling, are split into a set of equations for transport, for diffusion and a Generalized Stokes Probl...

In the scope of the 1990-04 lecture series on computational fluid dynamics, the solution of incompressible Navier-Stokes equation is presented. A computational code, named N sub 3 S, was developed for solving internal flows, turbomachinery flows, thermal hydraulics, external flows and flows in tube bundles. The main features and the experience acqu...

N3S is a finite element package which has been developed at EDF for the simulation of turbulent flows in complex geometries. Because of the numerical behavior of turbulence models such as k-ε for example, the numerical methods involved in this code has to be robust enough. After a systematic validation on a wide range of 2D and 3D, laminar and turb...

Compares various iterative solvers for the Stokes problem, based on the preconditioned Uzawa approach. A new class of preconditions, whose optimality will be shown, is introduced. -from Authors

To solve thermohydraulic problems arising in the various components of nuclear reactors, several departments of the Direction des Etudes et Recherches are developing the N3S three-dimensional code using the finite element method. This paper first presents the basic equations (Navier-Stokes with turbulence modelling and coupled with the thermal equa...

A multisolver approach for the treatment of complex turbulent Navier-Stokes equations involving more than 20,000 nodes in the three-dimensional case is considered. For various solvers, the decrease of divergence versus the number of iterations is shown for the steady-state wall-driven cavity. A Fourier analysis showing the dependence of the optimal...

The present work deals with the numerical calculation of incompressible industrial flow in three dimensional geometries. A finite element code, N3S, is described and tested for the computation of the flow in the cold plenum of a liquid metal fast breeder reactor.

Realistic simulation of the three dimensional industrial flows involves the treatment of complex equations i.e. Navier-Stokes with Boussinesq approximation and turbulence models, with several variables discretized on a large number of nodes. This set of equations was solved by using Ronat's algorithm which then leads to a Stokes problem. The Stokes...