DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Sung, Hyung-Jin | - |
dc.contributor.advisor | 성형진 | - |
dc.contributor.author | Park, Tae-Seon | - |
dc.contributor.author | 박태선 | - |
dc.date.accessioned | 2011-12-14T05:14:30Z | - |
dc.date.available | 2011-12-14T05:14:30Z | - |
dc.date.issued | 1996 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=105475&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/42800 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 기계공학과, 1996.2, [ xi, 121 p. ] | - |
dc.description.abstract | Two versions of k-ε turbulence model are proposed to compute turbulent separated and reattaching flows. In the first version, a nonlinear low-Reynolds-number $k-ε$ model is developed. In this model, the limiting near-wall behavior and nonlinear Reynolds stress representations are incorporated. Emphasis is placed on the adoption of $R_y (\equiv \sqrt{k} y /ν)$ instead of $y^+ (\equiv u_{τ}y /ν)$ in the low-Reynolds-number model for predicting turbulent separated and reattaching flows. The non-equilibrium effect is examined to describe the recirculating flows away from the wall. In the second version, a new $k-ε-f_{μ}$ turbulence model is proposed, which can be applied to complex flows involving multiple surfaces. The wall-damping function $f_{μ}$ is obtained by solving the elliptic $f_{μ}$ equation. Emphasis is placed on the formulation of the $f_{μ}$ equation in a general coordinate system. The near-wall effect, without reference to distance, is fully incorporated in this model. The non-equilibrium effect is examined to describe recirculating flows away from the wall. A modified model of the ε-equation is developed to account for the local anisotropy in strongly strained turbulent flows. A finite volume code based on SIMPLEC is developed for calculation of steady and incompressible flows with complex irregular boundaries. In this code, a third-order accurate convective scheme is implemented for non-uniform grid and three-dimensional version of strongly implicit procedure (SIP) is developed. The present models are validated by solving the benchmark problem of turbulent flow behind a backward-facing step and other complex turbulent flow. The predictions of the present model are cross-checked with the existing measurements and DNS data. The model performances are shown to be generally satisfactory. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Separated and reattaching flow | - |
dc.subject | Low-Reynolds-number k-\varepsilon turbulence model | - |
dc.subject | 저레이놀즈수 k-\varepsilon 난류모델 | - |
dc.subject | 박리와 재부착유동 | - |
dc.title | Low-Reynolds-number k-ε models for separated and reattaching flows | - |
dc.title.alternative | 난류박리 및 재부착 유동해석을 위한 저레이놀즈수 k-ε 난류모델 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 105475/325007 | - |
dc.description.department | 한국과학기술원 : 기계공학과, | - |
dc.identifier.uid | 000895195 | - |
dc.contributor.localauthor | Sung, Hyung-Jin | - |
dc.contributor.localauthor | 성형진 | - |
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