Conference Proceedings Paper
Two-Dimensional Simulation of the Downcomer Boiling Experiment Using the CUPID Code
NURETH-14 - 2011 September 25-30
Hyoung Kyu Cho (Korea Atomic Energy Research Institute)
Byong Jo Yun (Korea Atomic Energy Research Institute)
Jae Ryong Lee (Korea Atomic Energy Research Institute)
Han Young Yoon (Korea Atomic Energy Research Institute)
Jae Jun Jeong (Pusan National University)
For the analysis of transient two-phase flows in nuclear reactor components, a threedimensional
thermal hydraulics code, named CUPID, has been being developed. We
simulated the DOBO (Downcomer Boiling) experiment in two-dimensions using the CUPID
code to evaluate its two-phase flow models and verify its applicability to the downcomer
boiling analysis. The simulation result showed that it can reproduce the important
characteristics of the downcomer boiling, such as a flow pattern change and a circulation of
liquid accelerated by bubbles. The two-phase flow models that require further improvement
were identified as well for an enhanced prediction of the downcomer boiling.
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