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NACA0015 수중익에서의 공동 현상에 대한 OpenFOAM의 예측 정확도 검증
배준호 (J.H. Bae),이공희(G.H. Lee) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.3
Nuclear Power Plant(NPP) operators should conduct in-service test(IST) to check the performance of pumps and valves performing safety functions, and monitor and assess the degree of vulnerability over time. There are various causes of dissatisfaction with the regulatory requirements of safety-related pumps and valves in In-service test. The cavitation is one of the major thermal-flow phenomena that can affect the performance and integrity of these pumps and valves. This paper is a pilot research for simulation of IST-related pumps. For the pilot study, NACA0015 hydrofoil simulation is selected. The simulation is conducted using OpenFOAM multiphase solver by implemented cavitation model The solver is ‘interphaseChangeFoam’ that is unsteady, incompressible, isothermal and multiphase flow(Volume of Fluid method) Solver. The results were compared with experimental result. Also The implemented cavitation model are compared with supported model by OpenFOAM. Through this research, it is concluded that OpenFOAM have an good accuracy for k-ω turbulence model. The implemented cavitation model shows similar result with provided model by OpenFOAM. The prediction accuracy needs to be compared with other CFD software in the future work.
난류 모델에 따른 버터플라이 밸브 주위 유동 해석 결과 비교 연구
배준호(J.H. Bae),이공희(G.H. Lee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.1
Nuclear Power Plant operators regularly check the performance of pumps and valves that perform safety functions through In-Service Test(IST), and monitor and evaluate the degree of vulnerability over time. Butterfly valve is one of the main types of valves for IST. Understanding of flow characteristics of butterfly valve is helpful in preventing the safety of the IST-related system from being impaired due to a transient phenomenon unintentionally caused by opening and closing of the butterfly valve. In this study, we tried to analyze the flow characteristics of butterfly valve and effect of turbulence model. Three different Reynolds averaged Navier-Stokes turbulence models available in ANSYS Fluent R19, i.e., κ-ε, κ-ε (RNG) and κ-ω (SST) model were used for the calculation and flow characteristics were analyzed by varying the disk angle from 10° to 70°.
공동 모델의 계수가 캐비테이팅 벤츄리의 내부 유동 특성에 미치는 영향에 관한 연구
배준호(J.H. Bae),이공희(G.H. Lee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.4
Nuclear Power Plant operators regularly check the performance of pumps and valves that perform safety functions, and either monitor or evaluate the degree of vulnerability over time through In-Service Test(IST). Cavitating venturi is installed in the pipeline of the auxiliary feedwater system that is related to the IST. Cavitation is a phenomenon that impair the safety function. Accurate analysis of cavitation flow inside the cavitating venturi can contribute to improve the safety of the auxiliary feedwater system. In this study, we tried to analyze the flow characteristics inside the cavitating venturi and effect of cavitation model coefficient. The multiphase flow simulation was performed using k-ω turbulence model, Volume of Fluid(VOF) model and Zwart cavitation model, implemented in OpenFOAM and predicted results were compared with experimental data.