http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
후방계단유동에 대한 저레이놀즈 수 난류모형의 예측성능에 관한 연구
김원갑,최영돈,Kim, Won-Gap,Choe, Yeong-Don 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.5
Incompressible flow over a backward-facing step is computed by low Reynolds number turbulence models in order to compare with direct simulation results. In this study, selected low Reynolds number 1st and 2nd (Algebraic Stress Model : ASM) moment closure turbulence models are adopted and compared with each other. Each turbulence model predicts different flow characteristics, different re-attachment point, velocity profiles and Reynolds stress distribution etc. Results by .kappa.-.epsilon. turbulence models indicate that predicted re-attachment lengths are shorter than those by standard model. Turbulent intensity and eddy viscosity by low Reynolds number .kappa.-.epsilon. models are still greater than DNS results. The results by algebraic stress model (ASM) are more reasonable than those by .kappa.-.epsilon. models. The convective scheme is QUICK (Quadratic Upstream Interpolation for Convective Kinematics) and SIMPLE algorithm is adopted. Reynolds number based on step height and inlet free stream velocity is 5100.
金元鉀 慶一大學校 1993 論文集 Vol.9 No.1
The emerging background of the modernity in architecture can be restricted to the realm of metropolis. Metropolis is a center of being the Capitalist development, and characters of congestion, alienation, anonymity, mechanic inhumanity and abstract. This study concentrates on the relation of modernity and modern architecture in the metropolis and the influence of the concept of metroplois on the architectural modernity.
단면의 폭이 증가하는 180 곡덕트 내 난류유동의 수치해석적 연구
김원갑,김철수,최영돈 대한설비공학회 2004 설비공학 논문집 Vol.16 No.9
This paper reports the characteristics of the three dimensional turbulent flow by numerical method in the 180 degree bends with increasing cross-sectional area. Calculated pressure and velocity, Reynolds stress distributions are compared to the experimental data. Turbulence model employed are low Reynolds number model and algebraic stress model (ASM). The results show that the main vortex generated from the inlet part of the bend maintained to outlet of the bend and vortices are continually developed at the inner wall region. The distribution of turbulent kinetic energy along the bend are increase up to 120° because of increment of cross-sectional area. Secondary flow strength of the flow is lower about 60% than that of square duct flow.