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Open AccessArticle

Unsteady Simulation of a Full-Scale CANDU-6 Moderator with OpenFOAM

1
Thermal Hydraulic and Severe Accident Research Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea
2
School of Mechanical Convergence Systems Engineering, Kunsan National University, 558 Daehak-ro, Gunsan, Jeonbuk 54150, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(2), 330; https://doi.org/10.3390/en12020330
Received: 21 November 2018 / Revised: 14 January 2019 / Accepted: 16 January 2019 / Published: 21 January 2019
(This article belongs to the Special Issue Fluid Flow and Heat Transfer)
Three-dimensional moderator flow in the calandria tank of CANDU-6 pressurized heavy water reactor (PHWR) is computed with Open Field Operation and Manipulation (OpenFOAM), an open-source computational fluid dynamics (CFD) code. In this study, numerical analysis is performed on the real geometry model including 380 fuel rods in the calandria tank with the heat-source distribution to remove uncertainty of the previous analysis models simplified by the porous media approach. Realizable k-ε turbulence model is applied, and the buoyancy due to temperature variation is considered by Boussinesq approximation for the incompressible single-phase Navier-Stokes equations. The calculation results show that the flow is highly unsteady in the moderator. The computational flow visualization shows a circulation of flow driven by buoyancy and asymmetric oscillation at the pseudo-steady state. There is no region where the local temperature rises continuously due to slow circulating flow and its convection heat transfer. View Full-Text
Keywords: CANDU-6; PHWR; moderator; turbulence; OpenFOAM CANDU-6; PHWR; moderator; turbulence; OpenFOAM
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MDPI and ACS Style

Kim, H.T.; Chang, S.-M.; Son, Y.W. Unsteady Simulation of a Full-Scale CANDU-6 Moderator with OpenFOAM. Energies 2019, 12, 330. https://doi.org/10.3390/en12020330

AMA Style

Kim HT, Chang S-M, Son YW. Unsteady Simulation of a Full-Scale CANDU-6 Moderator with OpenFOAM. Energies. 2019; 12(2):330. https://doi.org/10.3390/en12020330

Chicago/Turabian Style

Kim, Hyoung T.; Chang, Se-Myong; Son, Young W. 2019. "Unsteady Simulation of a Full-Scale CANDU-6 Moderator with OpenFOAM" Energies 12, no. 2: 330. https://doi.org/10.3390/en12020330

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