DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Sung, Hyung-Jin | - |
dc.contributor.advisor | 성형진 | - |
dc.contributor.author | Ahn, Jong-Woo | - |
dc.contributor.author | 안종우 | - |
dc.date.accessioned | 2011-12-14T05:14:16Z | - |
dc.date.available | 2011-12-14T05:14:16Z | - |
dc.date.issued | 1996 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=105451&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/42786 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 기계공학과, 1996.2, [ xiii, 102 p. ] | - |
dc.description.abstract | In order to investigate performance of turbulent model and flow characteristics, the κ-ε-γ model has been applied to predict the two-dimensional momentumless wake where a jet and a wake coexist, and a nonlinear low-Reynolds-number κ-ε model has been modified to predict the flows over a step with inclined wall. The κ-ε-γ model performance is extended to resolve the jet/wake anomaly, which is encountered in calculating free shear flows by the standard κ-ε model. In the κ-ε-γ model, the relation between the rate of dissipation (ε) and the level of intermittency (γ) is well incorporated. The model is run to predict the two-dimensional momentumless wake where a jet and a wake coexist. The predictions of the κ-ε-γ model are compared with those by the κ-ε model as well as the experiment. It is shown that the model performance is generally satisfactory. A nonlinear low-Reynolds-number κ-ε model of Park and Sung is extended to predict the flows over a step with inclined wall, where the boundary layer flow without separation and the separated and reattaching flow coexist. An extensive test of the model of Park and Sung indicates that a slight modification of their model is needed. The main reason, which calls for a modification, is attributable to the fact that the model of Park and Sung has been developed on the basis of two extremities, i.e., the boundary layer flow and the flow over a backward-facing step (α=90℃). The predictions of the modified model are compared with those of the model of Abe, Kondoh and Nagano as well as the experiment. It is shown that the flows over a step with inclined wall are simulated successfully with the present model. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | momentumless wakes | - |
dc.subject | low-Reynolds-number k-ε turbulence model | - |
dc.subject | k-ε-γ model | - |
dc.title | Predictions of turbulent momentumless wakes and flows over a step with inclined wall | - |
dc.title.alternative | 운동량 결손이 없는 난류유동 및 경사진 계단유동의 수치해석 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 105451/325007 | - |
dc.description.department | 한국과학기술원 : 기계공학과, | - |
dc.identifier.uid | 000835571 | - |
dc.contributor.localauthor | Sung, Hyung-Jin | - |
dc.contributor.localauthor | 성형진 | - |
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