Abstract :

This paper describes the finite volume method implemented in Code Saturne, Electricite de France general-purpose computational fluid dynamic code for laminar and turbulent flows in complex two and three- dimensional geometries. The code is used for industrial applications and research activities in several fields related to energy production (nuclear power thermal-hydraulics, gas and coal combustion, turbomachinery, heating, ventilation and air conditioning...).
The set of equations considered consists of the Navier-Stokes equations for incompressible flows completed with equations for turbulence modelling (eddy-viscosity model and second moment closure) and for additional scalars (temperature, enthalpy, concentration of species, ...).

The time-marching scheme is based on a prediction of velocity followed by a pressure correction step. Equations for turbulence and scalars are resolved separately afterwards. The discretization in space is based on the fully conservative, unstructured fi nite volume framework, with a fully colocated arrangement for all variables. Speci c eff ort has been put into the computation of gradients at cell centres. Industrial applications illustrate important aspects of physical modellingsuch as turbulence (using Reynolds-Averaged Navier-Stokes equations or Large Eddy Simulation), combustion, conjugate heat transfer (coupled with the thermal code SYRTHES ) and fluid-particle coupling with a lagrangian approach. These examples also demonstrate the capability of the code to tackle a large variety of meshes and cell geometries, including hybrid meshes with arbitrary interfaces.

Key words : Navier-Stokes, finite volume, unstructured mesh, colocated arrangement, gradient calculation, turbulent flows, incompressible flows, Reynolds-Averaged Navier-Stokes equations, Large Eddy Simulation, parallel computing, nuclear power, gas and coal combustion, Code Saturne

Date of publication : February 2004

Paper presented by : Professor Jean-Marc Herard