Finite element method for numerical simulation of turbulent flows. The N3S code

The N3S thermal hydraulic calculation code which can be fitted to all encountered configurations is considered. It uses the finite element method and so allows local mesh refinements. The aim is to solve the equations of thermal hydraulics, namely Navier-Stokes equations coupled to energy equation in order to take into account thermal convection phenomena, for Reynolds numbers which can vary from several tens to several millions. The constraints which were defined for this code are linked to the industrial environment for which it was developed. It must be able to solve problems of industrial interest with realistic computation times on supercomputers and workstations. The N3S code is used for many industrial applications such as confined flows, thermal hydraulics, turbomachinery, and external flows. The range of application is shown. N3S, with the advantage of tetrahedron for complex three dimensional geometries modeling, expands in the direction of adaptative meshes and moving boundaries, and includes more and more complex physics of fluids.