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MMS 코드를 이용한 소듐냉각고속로의 출력변동운전 모의
김의광(Eui-Kwang Kim),최선락(Sun-Rock Choi),한지웅(Ji-Woong Han),이태호(Tae-Ho Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
The MMS model for KALIMER-600 plant dynamics analysis are developed. The models include NSSS, BOP, BOP controls, and the supervisory plant controls. The NSSS model is subdivided into component models, such as a CORE, IHXs, Pumps, SGs, and the rest of the NSSS loop model. The BOP model is subdivided into a steam subsystem, feedwater subsystem, and preheater subsystem. All these models have been incorporated into the Master model to simulate transients in the plant. Representative results for power ramp change from 100% to 25% with a demanded load reduction of 25% at 5% per minute in 2000 sec demonstrate the suitability of this model for study of power maneuvering without severe oscillation.
최석기(Seok-Ki Choi),김성오(Seong-O Kim),김의광(Eui-Kwang Kim),어재혁(Jae-Hyuk Eoh),최훈기(Hoon-Ki Choi) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
A numerical study has been performed for evaluation of convection schemes for thermal hydraulic analysis in a liquid metal reactor. Four convection schemes, HYBRID, QUICK, SMART and HLPA included in the CFX -4 code are considered. The performances of convection schemes are evaluated by applying them to the five test problems. The accuracy, stability and convergence are tested. It is shown that the HYBRID scheme is too diffusive, and the QUICK scheme exhibits overshoots and undershoots, and the SMART scheme shows convergence oscillations, and the HLPA scheme preserves the boundedness without causing convergence oscillations. The accuracies of SMART, QUICK and HLPA schemes are comparable. Thus, the use of HLPA scheme is highly recommended for thermal hydraulic analysis in a liquid metal reactor.
Evaluation of the K-Epsilon-VV-F Turbulence Model for Natural Convection in a Rectangular Cavity
최석기(Seok-Ki Choi),김성오(Seong-O Kim),김의광(Eui-Kwang Kim),최훈기(Hoon-Ki Choi) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.4
The primary objective of the present study is evaluation of the k-ε-vv-f turbulence model for prediction of natural convection in a rectangular cavity. As a comparative study, the from-layer k-ε model is also considered. Both models, with and without algebraic heat flux model, are applied to the analysis of natural convection in a rectangular cavity. The performances of turbulence models are investigated through comparison with available experimental data. The predicted results of vertical velocity component, turbulent heat fluxes, turbulent shear stress, local Nusselt number and wall shear stress are compared with experimental data. It is shown that, among the turbulence models considered in the present study, the k-ε-vv-f model with an algebraic heat flux model predicts best the vertical mean velocity and velocity fluctuation, and the inclusion of algebraic heat flux model slightly improves the accuracy of results.
ATHOS3 코드에 의한 고리1호기 증기발생기 열유동해석
최석기(Seok-Ki Choi),남호윤(Ho-Yun Nam),김의광(Eui-Kwang Kim),김형남(Hyung-Nam Kim),장기상(Ki-Sang Jang),홍성열(Sung-Yull Hong) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
This paper presents the numerical methodology of ATHOS3 code for thermal hydraulic analysis of Pressurized Water Reactor (PWR) steam generators. Topics include porous media approach, governing equations, physical models and correlations for solid-to-fluid interaction and heat transfer, and numerical solution scheme. The ATHOS3 code is applied to the thermal hydraulic analysis of steam generator in the Korea Kori Unit-l nuclear power plant and the computed results are presented