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일반 비직교 표면좌표계에서의 비압축성 점성유동의 수치해석
강동진,배상수,Gang, Dong-Jin,Bae, Sang-Su 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.5
In this paper, two discretization methods, hybrid and QUICK, are tested for the Navier-Stokes equations written in general nonorthogonal body fitted coordinates. Comparison is made by calculating two laminar flows at low Reynolds numbers of 10 - 100. One is a two-dimensional channel of gradually expanding cross section and the other is an axisymmetric flow through a circular tube having a circular constriction. Results show that the QUICK scheme results in a numerical solution more accurate than that of hybrid. The QUICK scheme also shows faster convergence for both test cases. As the number of grid points increases, all numerical solutions converge with more oscillation. The number of grid points in the y-direction(cross stream direction) is also shown to play a significant role in the approximation of convection term within separated flow zone.
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일반 비직교 표면좌표계에서의 비압축성 Navier-Stokes방정식의 수치해석
강동진,배상수,Gang, Dong-Jin,Bae, Sang-Su 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.3
In this paper, a numerical procedure for the calculation of the incompressible Navier-Stokes equations in a generalized nonorthogonal body fitted coordinate system is proposed and is validated through three test problems. Present numerical procedure derives the pressure equation by using the pressure substitution method on the regular grid system, and discretized momentum equations are based on the covariant velocity components. Cavity flow, backward facing step flow, and two dimensional channel flow with a sinusoidal wavy wall are chosen as three test problems. Numerical solutions obtained by present procedure shows a good agreement with previous numerical and/or experimental results. Convergence rate is also satisfactory.
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오찬옥(Oh, Chan-Ohk),김수영(Kim, Soo-Young),강동진(Gang, Dong-Jin) 한국실내디자인학회 2015 한국실내디자인학회논문집 Vol.24 No.2
As the aging society is globally increasing, the guide for the aged-friendly city is suggested by WHO and many cities are preparing to meet with it. The base of this guide for an age-friendly city is an active aging. This study examined how degree the neighborhood environment is age-friendly older persons’ standpoints. The data were collected through the interview with old persons who aged more than 65 years, 117 persons in an urban area and 110 ones in a rural area. The age-friendly degree of neighborhood environment was examined from two aspects. One is how close 12 neighborhood facilities were from the elderly’s houses. Another one is how degree the elderly were considered in 4 areas: pedestrian road, traffic, the amount of housing for the elderly, and space layouts of their houses. Findings were as follows. First, the elderly related neighborhood facilities in urban area were closer located to old persons’ houses than in rural area, except the senior center. Second, in case of the age-friendly degree of their neighborhood environments, the space layout of house was the highest, and then traffic, pedestrian road, and the amount of housing for the elderly, in order. The consideration degree of wheelchair users was the lowest. Third, the age-friendly degree of pedestrian road, traffic, and room layout of house in rural area were higher than in urban area. However, the amount of housing for the elderly in urban area was higher than in rural area.
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