Conference Proceedings Paper
Numerical Simulation of an Air-Water Counter-Current Two-Phase Flow Experiment in a PWR Hot Leg Model Using an Interfacial Area Density Model
NURETH-14 - 2011 September 25-30
Thomas Hoehne (HZDR)
Deen Darlianto (HZDR)
Christophe Vallée (HZDR)
Dirk Lucas (HZDR)
Matthias Beyer (HZDR)
In order to improve the understanding of counter-current two-phase flows and to validate new physical models, CFD simulations of 1/3 rd scale model of the hot leg of a German Konvoi PWR with rectangular cross section was performed. Selected counter-current flow limitation (CCFL) experiments at the Helmholtz-Zentrum Dresden- Rossendorf (HZDR) were calculated with ANSYS CFX 12.1 using the multi-fluid Euler-Euler modeling approach. The transient calculations were carried out using a gas/liquid inhomogeneous multiphase flow model coupled with a SST turbulence model for each phase. In the simulation, the surface drag was approached by a new correlation inside the Algebraic Interfacial Area Density (AIAD) model. The AIAD model allows the detection of the morphological form of the two phase flow and the corresponding switching via a blending function of each correlation from one object pair to another. As a result this model can distinguish between bubbles, droplets and the free surface using the local liquid phase volume fraction value. A comparison with the high-speed video observations shows a goodqualitative agreement. The results indicated that quantitative agreement of the CCFL characteristics between calculation and experimental data was obtained. The goal is to provide an easy usable AIAD framework for all ANSYS CFX users, with the possibility of the implementation of their own correlations.
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