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정영래(Y. R. Jung),박원규(W. G. Park),이상욱(S. W. Lee) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
The numerical procedure has been developed for simulating incompressible viscous flow around a turbine stage with rotor-stator interaction. This study solves 2-D unsteady incompressible Navier-Stokes equations on a non-orthogonal curvilinear coordinate system. The Marker-and-Cell concept is applied to efficiently solve continuity equation. To impose an accurate boundary condition, O-H multiblocked grid system is generated. O-type grid and H-type grid is generated near and outer rotor-stator. The cubic-spline interpolation is applied to handle a relative motion of a rotor to the stator. Turbulent flows have been modeled by the Baldwin- Lomax turbulent model. To validate present procedure, the time averaged pressure coefficients around the rotor and stator are compared with experiment and a good agreement obtained.
측풍영향을 고려한 고속전철 주위의 3차원 난류유동 해석
정영래(Y. R. Jung),박원규(W. G. Park),하성도(S. D. Ha) 한국전산유체공학회 1996 한국전산유체공학회지 Vol.1 No.1
An iterative time marching procedure for solving incompressible turbulent flow has been applied to the flows around a high speed train including cross-wind effects. This procedure solves three-dimensional unsteady incompressible Reynolds-averaged Navier-Stokes equations on a non-orthogonal curvilinear coordinate system using first-order accurate schemes for the time derivatives and third/second-order accurate schemes for the spatial derivatives. Turbulent flows have been modeled by Baldwin-Lomax turbulent model. To validate present procedure, the flow around a high speed train at zero yaw angle was simulated and compared with experimental data. Generally good agreement with experiments was achieved. The flow fields around the high speed train at 9.2˚. 16.7˚ and 45˚ of yaw angle were also simulated.
유동장 수치해석이 포함된 퍼프모델을 이용한 오염물질의 확산 해석
정영래(Y. R. Jung),박원규(W. G. Park),박옥현(O. H. Park) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
The computations of the flowfield and pollutant dispersion over a flat plate and the Russian hills of various slopes are described. The Gaussian plume and the puff model have been used to calculate concentration of pollutant. The Reynolds-averaged unsteady incompressible Navier-Stokes equation with low Raynolds k-ε model has been used to calculate the flowfield. The flow data of a flat plate and the Russian hills from Navier-Stokes equation solutions has been used as the input data for the puff model. The computational results of flowfield agree well with experimental results of both a flat plate and Russian hills. The concentration prediction by the Gaussian plume. model and the Gaussian puff model also agrees fairly well with experiments.
측풍영향을 고려한 고속전철 주위의 비압축성 점성 유동 해석
정영래(Y.R. Jung),박원규(W.G. Park),김홍원(H.W. Kim),하성도(S.D. Ha) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
The flow field around a high-speed train including cross-wind effects has been simulated. This study solves 3-D unsteady incompressible Navier-Stokes equations in the inertial frame using the iterative time marching scheme. The governing equations are <br/> differenced with 1st-order accurate backward difference scheme for the time derivatives. 3th-order accurate QUICk scheme for the convective terms and 2nd-order accurate central difference scheme for the viscous terms. The Marker-and-Cell concept was applied to efficiently solve continuity equation. which is differenced with 2nd-order accurate central difference scheme. The 4th-order artificial damping is added to the continuity equation for numerical stability. A C-H type of elliptic grid system is generated around a high-speed train including ground. The Baldwin-Lomax turbulent model was implemented to simulate the turbulent flows. To validate the present procedure, the flow around a high speed train at constant yaw angle of 45°and 90°has been simulated. The simulation shows 3-D vortex generation in the lee corner. The flow separation is also observed around the rear of the train. It has concluded that the results of present study properly agree with physical flow phenomena.
정영래(Y. R. Jung),박원규(W. G. Park),박영준(Y. J. Park),김종섭(J. S. Kim),홍성훈(S. H. Hong) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.1
The flow field around a three dimensional minivan-like body has been simulated. This study solves 3-D unsteady incompressible Navier-Stokes equations on a non-orthogonal curvilinear coordinate system using second-order accurate schemes for the time derivatives, and third/second-order scheme for the spatial derivatives. The Marker-and-Cell concept is applied to efficiently solve continuity equation. A H-H type of multi-block grid system is generated around a three dimensional miuivan-like body, Turbulent flows have been modeled by the Baldwin-Lomax turbulent model. To validate present procedure, the flows around the Ahmed body with 12.5' of slant angle are simulated. A good agreement with other numerical results is achived. After code validation, the flows around a mimivan-like body are simulated. The simulation shows three dimensional vortex-pair just behind body. The flow separation is also observed on the rear of the body. It has concluded that the results of present study properly agreed with physical flow phenomena.
정영래(Y. R. Jung),박원규(W. G. Park),박영준(Y. J. Park),김종섭(J. S. Kim),홍성훈(S. H. Hong) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.1
The flow field around a three dimensional minivan-like body has been simulated. This study solves 3-D unsteady incompressible Navier-Stokes equations on a non-orthogonal curvilinear coordinate system using second-order accurate schemes for the time derivatives, and third/second-order scheme for the spatial derivatives. The Marker-and-Cell concept is applied to efficiently solve continuity equation. A H-H type of multi-block grid system is generated around a three dimensional miuivan-like body, Turbulent flows have been modeled by the Baldwin-Lomax turbulent model. To validate present procedure, the flows around the Ahmed body with 12.5' of slant angle are simulated. A good agreement with other numerical results is achived. After code validation, the flows around a mimivan-like body are simulated. The simulation shows three dimensional vortex-pair just behind body. The flow separation is also observed on the rear of the body. It has concluded that the results of present study properly agreed with physical flow phenomena.
유동장 수치해석이 포함된 퍼프모델을 이용한 오염물질의 확산 해석
정영래(Y. R. Jung),박원규(W. G. Park),박옥현(O. H. Park) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
The computations of the flowfield and pollutant dispersion over a flat plate and the Russian hills of various slopes are described. The Gaussian plume and the puff model have been used to calculate concentration of pollutant. The Reynolds-averaged unsteady incompressible Navier-Stokes equation with low Raynolds k-ε model has been used to calculate the flowfield. The flow data of a flat plate and the Russian hills from Navier-Stokes equation solutions has been used as the input data for the puff model. The computational results of flowfield agree well with experimental results of both a flat plate and Russian hills. The concentration prediction by the Gaussian plume. model and the Gaussian puff model also agrees fairly well with experiments.
강동민(D. M. Kang),정영래(Y. R. Jung),박원규(W. G. Park),하성도(S. D. Ha) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
This paper describes the flow field analysis of an automobile with crosswind effects of 15˚, 30˚, 45˚ and 60˚ of yaw angles. The governing equations of the 3-D incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. The computated surface pressure coefficients have been compared with experimental results and a good agreement has been achieved. The A- and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown. The variation of aerodynamic coefficients of drag. lift. side force and moments with respect to yaw angle is systematically studied.
강동민(D. M. Kang),정영래(Y. R. Jung),박원규(W. G. Park) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
This paper describes the flow analysis of the automobile with crosswind effects of 15˚, 30˚ and 45˚ of yaw angle. The governing equations of the 3-D unsteady incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. The A- and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown.