http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
S-duct 내부유동의 출구경계조건 및 난류모델의 영향검토
홍승규(S. K. Hong),이광섭(K. S. Lee) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
An S-duct flow is subjected to an entrance flow of Mach 0.6. The duct turns 30˚ and reverses its turn by 30˚, followed by a straight section. Such an internal flow induces a secondary flow due to curvature effect. Goal of this paper is to show the sensitivity of outflow boundary conditions on the quality of numerical solutions as well as to show curvature effect on the flow field. The often-used Baldwin-Lomax turbulence model is shown to be less functional on the concave region when the secondary flow has its strong influence.
CFDS기법에 연계된 특성경계조건의 응용성에 대한 소개
홍승규(S. K. Hong),이광섭(K. S. Lee) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.1
Characteristic boundary conditions are discussed in conjunction with a flux-difference splitting formulation as modified from Roe's linearization. Details of how one can implement the characteristic boundary conditions which are made compatible with the interior point formulation are described for different types of boundaries including subsonic outflow and adiabatic wall. The validity of boundary conditions are demonstrated through computation of transonic airfoil, supersonic ogive-cylinder, hypersonic cylinder, and S-duct internal flows. The computed wall pressure distributions are compared with published experimental and computed data. Objectives of this paper are thus to give insight of formulation procedure of a flux-difference splitting method and to pave ways for other users to adopt present boundary procedure on their numerical methods.
김유진(E. Kim),박수형(S.H. Park),권장혁(J.H. Kwon),김성인(S.I. Kim),박승오(S.O. Park),이광섭(K.S. Lee),홍승규(S.K. Hong) 한국전산유체공학회 2004 한국전산유체공학회지 Vol.9 No.2
A numerical study of under expanded jet and impingement on a wall mounted at various distances from the nozzle exit is presented. The 3-dimensional Navier-Stokes equations and k-ω turbulence equations are solved. The grids are constructed as overlapped grid systems to examine the distance effect. The DADI method is applied to obtain steady-state solutions. To avoid numerical instability such as the carbuncle phenomena that sometimes accompany approximate Riemann solver, the HLLE+ scheme is employed for the inviscid flux at the cell interfaces. A goal of this work is to apply a number of two-equation turbulence models based on the ω equation to the impinging jet problem.
초음속 충돌 제트 운동에 대한 k-$\omega$ 난류모델의 적용
김유진,박수형,권장혁,김성인,박승오,이광섭,홍승규,Kim E.,Park S. H.,Kwon J. H.,Kim S. I.,Park S. O.,Lee K. S.,Hong S. G. 한국전산유체공학회 2004 한국전산유체공학회지 Vol.9 No.2
A numerical study of underexpanded jet and impingement on a wall mounted at various distances from the nozzle exit is presented. The 3-dimensional Wavier-Stokes equations and κ-ω turbulence equations are solved. The grids are constructed as overlapped grid systems to examine the distance effect. The DADI method is applied to obtain steady-state solutions. To avoid numerical instability such as the carbuncle phenomena that sometimes accompany approximate Riemann solver, the HLLE+ scheme is employed for the inviscid flux at the cell interfaces. A goal of this work is to apply a number of two-equation turbulence models based on the w equation to the impinging jet problem.
이충연(C.Y. Lee),사정환(J.H. Sa),박수형(S.H. Park),이은석(E.S. Lee),이진익(J.I. Lee),이광섭(K.S. Lee) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.4
Effects of the subgrid length-scale in the Delayed-Detached Eddy Simulation(DDES) are investigated based on the Spalart-Allmaras(S-A) and the k-ω Shear Stress Transport(SST) turbulence models. Driver & Seegmillers experimental results are used to validate numerical results. Grid convergence with grid resolution and subgrid length-scale is investigated. The simulation results show that the volume method for the subgrid length-scale is more resistant to unfavorable effects of the grid size in the periodic direction than the maximum method. Using a sufficient grid resolution and an appropriate subgrid length-scale, both S-A based DDES and SST based DDES methods can provide a good correlation with the experimental data.
김유진(E. Kim),박수형(S. H. Park),권장혁(J. H. Kwon),김성인(S. I. Kim),박승오(S. O. Park),이광섭(K. S. Lee),홍승규(S. K. Hong) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
A numerical study of underexpanded jet and impingement on a wall mounted at various distances from the nozzle exit is presented. The 3-dimensional Navier-Stokes equations and k-ω turbulence equations are solved. The grids are constructed as overlapped grid systems to examine the distance effect. The DADI method is applied to obtain steady-state solutions. To avoid numerical instability such as the carbuncle that sometimes accompany approximate Riemann solver, the HLLE+ scheme is employed for the inviscid flux at the cell interfaces. A goal of this work is to apply a number of two-equation turbulence models based on the ω equation to the impinging jet problem.