Validation of CFD code FLUIDYN-MP for steam condensation at walls in presence of non-condensable gases

Abstract

Validation of condensation model of CFD code FLUIDYN-MP has been carried out against two experimental data. The influence of turbulence model and grid size on condensation rate has been studied. Models for the simulation of wall condensation in presence of non-condensable have been developed to simulate the typical post-LOCA steam laden atmosphere of the containment of a Nuclear Power Plant (NPP). This model has been incorporated in the general purpose CFD software FLUIDYN-MP. In this work, the concept of heat and mass transfer analogy (Chilton-Colburn analogy) has been used for modelling of wall condensation. In this analogy, the convective heat transfer coefficient is obtained by Reynolds analogy formulation and the mass transfer coefficient is calculated based on Chilton-Colburn empirical analogy. The wall condensation model implemented in FLUIDYN-MP has been validated against experiments conducted in COPAIN facility at CEA, France and the CONAN facility at University of Pisa, Italy. The paper presents details of the wall condensation model, the methodology for its implementation in the CFD code and results of the validation against reported experimental Data. The results of CFD simulations of these experiments compared well with the measured data.