Development of Direct Steam-Water Phase Change Analysis Method Applying to BWR Operating Condition
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
B2-2 Computational Multi-Fluid Dynamics and Validation/Verification/Applications

Masato Fukuta (Toshiba Corporation)
Yasushi Yamamoto (Toshiba Corporation)
Toru Mitsutake (Toshiba Corporation)


A simulation method applicable to estimation of the two-phase flow in Next Generation BWR fuel

assembly has been developed. In this paper, to realize “design-by-analysis”, two CFD analysis

models were developed. Firstly, the hybrid two-phase flow analysis model was developed to

simulate the flow pattern transition. Using this model, it was confirmed that the generation of large

bubbles by bubble coalescence could be simulated. Secondly, to analyze boiling phenomena, a

phase-field model combined with Navier-Stokes equations was developed. We succeeded in

simulating the boiling process, bubble nucleation, growth, and departure from heating wall directly

under the BWR in-core pressure condition.

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