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단면의 폭이 감소하는 180° 곡덕트 내 난류유동의 수치해석적 연구
김원갑,최영돈 대한설비공학회 2002 설비공학 논문집 Vol.14 No.12
This paper reports the characteristics of the three dimensional turbulent flow in the 180 degree bends with decreasing cross-sectional area by numerical method. Calculated pressure and velocity, Reynolds stress distributions are compared to the experimental data. Turbulence model employed are low Reynolds number k-epsilon model and algebraic stress model. The results show that the main vortex generated from the inlet part of the bend maintained to outlet of the bend because of the contraction of cross-sectional area. The rate of increase of turbulent kinetic energy through the bend are lower than that of mean flow. Secondary flow strength of the flow is lower about 60% than that of square duct flow.
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김원갑 기술표준원 2007 기술표준 Vol.64 No.-
우리의 이동통신 및 인터넷 방식이 미국이나 유럽시장에서 표준으로 자리잡기도 하는 등 세계의 표준경쟁에서 우리나라도 어느새 점차 그 세력을 넓혀가고 있습니다.
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김원갑 대한건축학회 1999 대한건축학회논문집 Vol.15 No.4
Architecture and cinema has close relationship in that they represent Images in space and tame. Especially the enlargement of the idea of space in modern architecture with the idea of 4th dimension made the emphasis on the visual perception in movement through the movement of viewer. Among the various movements in art and architectutre in the 20th century, Expressionism, De Stijl, Dada, Surrealism, and the architecture of Le Corbusier shows strong mutual influences between architecture and cinema This study aims at the analysis of mutual influences in the design methods of modern architecture and cinema, and the relatinship of those two genres among the various historical avant-gardes
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단면의 폭이 증가하는 $180^\circ$ 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 $textsc{k}$-$\varepsilon$ 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$^{\circ}$ because of increment of cross-sectional area. Secondary flow strength of the flow is lower about 60% than that of square duct flow.
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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.
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