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STATUS AND PERSPECTIVE OF TWO-PHASE FLOW MODELLING IN THE NEPTUNE MULTISCALE THERMAL-HYDRAULIC PLATFORM FOR NUCLEAR REACTOR SIMULATION  

BESTION DOMINIQUE (EDF R&D, Fluid Mechanics and Heat Transfer Department 6 quai Watier)
GUELFI ANTOINE (EDF R&D, Fluid Mechanics and Heat Transfer Department 6 quai Watier)
DEN/EER/SSTH CEA-GRENOBLE, (EDF R&D, Fluid Mechanics and Heat Transfer Department 6 quai Watier)
Publication Information
Nuclear Engineering and Technology / v.37, no.6, 2005 , pp. 511-524 More about this Journal
Abstract
Thermalhydraulic reactor simulation of tomorrow will require a new generation of codes combining at least three scales, the CFD scale in open medium, the component scale and the system scale. DNS will be used as a support for modelling more macroscopic models. NEPTUNE is such a new generation multi-scale platform developed jointly by CEA-DEN and EDF-R&D and also supported by IRSN and FRAMATOME-ANP. The major steps towards the next generation lie in new physical models and improved numerical methods. This paper presents the advances obtained so far in physical modelling for each scale. Macroscopic models of system and component scales include multi-field modelling, transport of interfacial area, and turbulence modelling. Two-phase CFD or CMFD was first applied to boiling bubbly flow for departure from nucleate boiling investigations and to stratified flow for pressurised thermal shock investigations. The main challenges of the project are presented, some selected results are shown for each scale, and the perspectives for future are also drawn. Direct Numerical Simulation tools with Interface Tracking Techniques are also developed for even smaller scale investigations leading to a better understanding of basic physical processes and allowing the development of closure relations for macroscopic and CFD models.
Keywords
Two-Phase Flow Modelling; Multi-Scale Modelling; Two-Phase CFD; Direct Numerical Simulation; System Code; Nuclear Reactors;
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