Two-Dimensional Simulation of the Downcomer Boiling Experiment Using the CUPID Code
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
B2-1 Computational Multi-Fluid Dynamics and Validation/Verification/Applications

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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