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SUBOFF 잠수함 모델의 캐비테이션터널 조건 저항 및 자항 수치해석 연구
박일룡(I.R. Park),김제인(J.I. Kim),서성부(S.B. Suh),설한신(H.S. Seol) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.3
In this paper, numerical investigation of the resistance and self-propulsion of the SUBOFF submarine model in the KRISO large cavitation tunnel was carried out by using the Reynolds averaged Navier-Stokes method and Reynolds stress model for turbulence closure. This study followed the sensitivity analysis of grid and turbulence models done by Byeon et al.[11] which was for the numerical estimation of the resistance of the SUBOFF model in DTRC towing tank. In the numerical results, the resistances and the nominal wake field were validated by the experimental data of the cavitation tunnel. After blockage corrections, the computed resistances showed a good accordance with those of the DTRC towing tank test free from blockage effects. Self-propulsion simulations for wetted and cavitating flow conditions were performed on the basis of thrust identity approach and resulted in a good agreement with the measured self-propulsion data and cavitation observations for the propeller.
박일룡(I.R. Park),박대진(D.J. Park),김제인(J.I. Kim),서성부(S.B. Suh),백부근(B.G. Paik),안종우(J.W. Ahn),김기섭(K.S. Kim) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.3
The cavitation inception of a two-dimensional hydrofoil is studied numerically by using the unsteady Reynolds averaged Navier-Stokes method that includes a cavitation model explaining the phase change between the water and vapour. The cavitation inceptions of the NACA0022 hydrofoil at various angles of attack are estimated after following the dependence tests of grid and turbulence model on the wetted flow around the NACA0012 section. In this paper, cavitation inception is determined when the computed cavitation volume approaches to zero value by gradually increasing cavitation number. In the numerical results, the computed sheet cavitations attached to the suction side of the hydrofoil show a close agreement with the cavitation observations in the KRISO medium-sized cavitation tunnel. Finally, the cavitation inception bucket predicted by the current cavitation simulation shows a better agreement with the experimental data than the two results of the potential flow and the minimum pressure analyses.
이강남(K. N. Lee),정광효(K. H. Jung),채영준(Y. J. Chae),박일룡(I. R. Park),서성부(S. B. Suh) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.2
In this study, the green water phenomena on rectangular shaped structure is numerically simulated by STAR-CCM+ to investigate the flow pattern including the velocity profiles in bubbly water flow. 5 phases of the formation of green water in front of and over the rectangular shaped structure is simulated at the design condition which is scaled down by 1:125 from FPSO operating in GOM. All numerical results are compared with the experimental results performed in a two dimensional wave flume. The water deformation due to the green water are obtained by the high speed CCD camera with employing the shadow graphy technique, which is allowed to take the bubbly water flow into images. A series of image taken by shadow graphy technique is analyzed with MQD method to calculate the velocity in bubbly water flow.