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강태진(T. J. Kang),박원규(W. G. Park),정철민(C. M. Jung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
The cavitating flow simulation is of practical importance for many engineering systems, such as pump, turbine, nozzle, injector, etc. In the present work, a solver for two-phase flows has been developed and applied to simulate the cavitating flows past hydofoils. An experimental data and other numerical data were compared with the present results to validate the present solver. It is concluded that the present numerical code has successfully accounted for two-phase Navier-Stokes model of cavitation flow.
강태진(T.J. Kang),박원규(W.G. Park),정철민(C.M. Jung) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.2
Cavitation causes a great deal of noise, damage to components, vibrations, and a loss of efficiency in devices, such as propellers, pump impellers, nozzles, injectors, torpedoes, etc. Thus, the cavitating flow simulation is of practical importance for many engineering systems. In the present work, a two-phase flow solver based on the homogeneous mixture model has been developed. The solver employs an implicit preconditioning, dual time stepping algorithm in curvilinear coordinates. The flow characteristics around Clark-Y hydrofoil were calculated and then validated by comparing with the experimental data. The lift and drag coefficients with changes of angle of attack and cavitation number were obtained. The results show that cavity length and lift, drag coefficient increase with increasing angle of attack.
강태진(T.J. Kang),박원규(W.G. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The cavitating flow simulation is of practical importance for many engineering systems, such as pump, turbine, nozzle, injector, etc. In the present work, a solver for two-phase flows has been developed and applied to simulate the cavitating flows past hydrofoils. An experimental data and other numerical data were compared with the present results to validate the present solver. It is concluded that the present numerical code has successfully accounted for two-phase Navier-Stokes model of cavitation flow. This study could be confirmed chracteristic of hydrodynamic coefficients with change of the angle of attack. Lift and Drag coefficient increase as the increase of angle of attack. When hydrofoil is pitching motion, lift coefficient of hydrofoil for upstroke and downstroke is not changed to the decreases of cavitation number.
동유체력 계산을 이용한 수중운동체의 횡동요 계수 변화 예측
김태우(T. W. Kim),강태진(T. J. Kang),박원규(W. G. Park),정철민(C. M. Jung) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.2
For Underwater vehicles, Unwanted roll excursions are inevitable as they are caused by induced propeller torque, disturbances, and banking motion during turns. To estimate the manoeuvring performance of underwater vehicle, it is necessary to obtain the roll coefficient of body. This paper was covered estimation of roll coefficient of underwater vehicle using STAR-CCM+, commercial CFD(Computational Fluid Dynamics) code. The RANS equations for incompressible fluid flows was solved numerically by using a finite volume method. An MRF(Moving Reference Frame) Method was Also adopted for rotations of body. For the validation, the flow around a DARPA SUBOFF bare hull model was simulated and good agreement with experiments was obtained. And Pure roll coefficients were calculated and campared with the experimental data which were presented by Seoul National University. Finally, an underwater vehicle model with propeller was simulated and analyzed for estimation of roll coefficient variation caused by induced propeller torque.
Forced-Rolling 시 Barge형 부유체 주위의 유동전산해석
김경진(K.J. Kim),강태진(T.J. Kang),조장근(J.K. Cho),박원규(W.G. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The present study is numerical simulation result to solve two-phase flow around a two-dimensional (2D) barge platform in forced-rolling. A platform with a draft equal to one half of its height was hinged at the center of gravity and free to roll with waves that had the same period as the natural roll period of a barge platform. In order to simulate the 2D incompressible viscous two-phase flow in a wave tank with the barge platform, the present study used the volume of fluid (VOF) method based on the finite volume method with a standard turbulence model. In addition, the dynamic mesh technique was used to handle the motion of the barge platform induced by the fluid-structure interaction. Consequently, the present results are able to predict the relevant aspects of the flow field and roll motion of the barge platform structure.