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A New k- Model for Prediction of Transitional Boundary-Layer Under Zero-Pressure Gradient
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 Title & Authors
A New k- Model for Prediction of Transitional Boundary-Layer Under Zero-Pressure Gradient
Baek, Seong-Gu; Im, Hyo-Jae; Jeong, Myeong-Gyun;
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 Abstract
A modified model is proposed for calculation of transitional boundary layer flows. In order to develop the eddy viscosity model for the problem, the flow is divided into three regions; namely, pre-transition region, transition region and fully turbulent region. The pre-transition eddy-viscosity is formulated by extending the mixing length concept. In the transition region, the eddy-viscosity model employs two length scales, i.e., pre-transition length scale and turbulent length scale pertaining to the regions upstream and the downstream, respectively, and a universal model of stream-wise intermittency variation is used as a function bridging the pre-transition region and the fully turbulent region. The proposed model is applied to calculate three benchmark cases of the transitional boundary layer flows with different free-stream turbulent intensity (1%∼6%) under zero-pressure gradient. It was found that the profiles of mean velocity and turbulent intensity, local maximum of velocity fluctuations, their locations as well as the stream-wise variation of integral properties such as skin friction, shape factor and maximum velocity fluctuations are very satisfactorily predicted throughout the flow regions.
 Keywords
k- Model;Bypass Transition;Pre-Transition Region;Intermittency;Boundary-Layer;Mixing-Length;Flat Plate;
 Language
Korean
 Cited by
1.
수치 모사를 통한 이중원호 익렬의 성능 예측,정명균;오재민;팽기석;송재욱;

대한기계학회논문집B, 2002. vol.26. 3, pp.432-438 crossref(new window)
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