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김성인(S.I. Kim),박승오(S.O. Park),홍승규(S.K. Hong),이광섭(K.S. Lee) 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.4
Present study simulates oscillatory supersonic impinging jet flows using the axisymmetric Navier-Stokes code. To capture the salient features of flow oscillation and overcome the divergence during the initial transient period, several tests have been conducted for the grid and time step sizes. The results also show that the effects of the inlet flow condition at the nozzle exit and turbulence on the oscillatory behavior of supersonic impinging jets are negligible. Frequencies of the surface pressure oscillation obtained by the selected numerical method are in good accord with the measured impinging tones for various cases of nozzle-to-plate distance. Two seemingly different staging behaviors with nozzle-to-plate distance and nozzle pressure variations are found to correlate well if the frequency and distance are normalized by the length of the first shock cell.
비만세포 (Mast cell) 과렵 염색을 위한 Giemsa 염색액의 적정 pH 연구
김성인 ( S I Kim ) 대한임상검사과학회 1992 대한임상검사과학회지(KJCLS) Vol.24 No.1
This study was conducted to find out the optimal pH of Giemsa stain for the demonstration of mast cell granules. Various buffers from pH 4.0 to pfl 9.0 were used. Sections were treated for 30 minutes with a mixture of buffer 30 ml and stock Giemsa solution 1 mi. After washing with distilled water, decolorization is performed with absolute ethanol for 20 seconds and clear in xylene 3 steps, and mount in a canada balsam. The results are that mast cell granules were stained red and nuclei were blue, collagen fibers were pink to light-blue in all pH solutions. The best results were obtained at pH 7.0-8.0 solutions and the more increaed pH solution were used the more intensity stain result were obtained.
노즐 압력비와 충돌면까지의 거리 변화에 따른 초음속 충돌 제트 유동의 진동 특성
김성인(S. I. Kim),박승오(S. O. Park),이광섭(K. S. Lee) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Numerical simulations of supersonic impinging jet flows are carried out using the axisymmetric Navier-Stokes code. This paper focuses on the oscillatory flow features associated with the variation of the nozzle pressure ratio and nozzle-ta-plate distance. Frequencies of the surface pressure oscillation from computational results are in accord with the measured impinging tones for various cases of nozzle-ta-plate distance. The variation of this frequency with distance show a staging behavior. Computed results for the case of nozzle pressure ratio variation for a fixed nozzle-to-plate distance also demonstrate a staging behavior. These two seemingly different staging behaviors are found to obey the same frequency-distance characteristics when the frequency and the distance are normalized by using the length of the shock cell.
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.
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.