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후향계단을 지나는 박리류에 대한 레이놀즈응력 모델의 성능 평가
김광용,오명택,Oh, Myung-Taek 대한기계학회 1995 대한기계학회논문집 Vol.19 No.11
This study is carried out in order to evaluate the performances of the Reynolds stress turbulence models such as SSG and GL models in the calculation of separated flow over backward-facing stepp.In addition, two slow return-to-isotropy models, YA and Rotta models combined with rapid part of SSG model are also tested. The finite volume method is used to discretize the governing differential equations, and the power-law scheme is used to approximate the convection terms. The SIMPLE algorithm is used for pressure correction in the governing equations. The results show that SSG model gives the better prediction near the reattachment point than GL model. In cases that the rapid term of SSG model is combined with Rotta and YA slow models, the results show the better predictions of stress components in recirculation zone, but indicate inaccuracy in the predictions of mean velocity.
김정연(Kim, Jeong-Youn),김은순(Gim, Uhn-Soon),오명택(Oh, Myung-Taek) 한국지역개발학회 2014 韓國地域開發學會誌 Vol.26 No.1
The objectives of this study are to analyze the characteristics of rural areas and to classify regional types by applying the multi-variate techniques of factor and cluster analyses, with 171 Eup?Myon level data of Chungcheongnam-do in 2010. During the process of urbanization and industrialization of rural areas, the differences in location, socio-demographic factors, geo-politics, urbanizing and industrializing patterns in rural areas have been driving or accelerating differentiation of rural areas. Based on the factor analysis, 21 factors of Eup-Myon areas are categorized five principal characteristics as follows: municipal city characteristics, typical paddy farming characteristics, urbanizing rural characteristics, aged farming characteristics, and industrializing rural characteristics. According to the cluster analysis, 171 Eup?Myon areas of Chungcheongnam-do are classified as 6 different regional types as follows; rural service center, aging rural area, urbanizing rural area, paddy farming area, transitional rural area, and manufacturing industry area. It revealed different regional types show significantly different characteristics, which hints rural areas have been experiencing diverse differentiation process depending on regional types.