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수정 k-ε 모델에 의한 실제 L-형 리블렛의 항력저감 성능예측
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 Title & Authors
수정 k-ε 모델에 의한 실제 L-형 리블렛의 항력저감 성능예측
명현국;
 
 Abstract
A low-Reynolds-number k-ε turbulence model is applied to predict drag reduction performance for actual L-shaped (blade-type) riblets with finite-thickness in fully-developed flows between i nfinite parallel planes. The present turbulence model is a modified version of the Launder & Sharma''s k-ε model (LS model), in which the gradient production term in ε-equation is modeled to have only the normal derivative terms. The present predictions for drag reduction behavior such as the maximum drag reduction and effects of riblets on turbulence quantities are in good agreement with both the experiments and the recent DNS results: differences in the mean velocity profile and turbulent quantities are found to be limited to the riblet cavity region. Turbulence quantities are also reduced in drag-reducing configurations. Possible shortcomings in the present model using an isotropic turbulent viscosity are also discussed particularly with reference to the absence of any turbulence-driven Secondary motions.
 Keywords
Riblet Performance;Drag Reduction;Low-Reynolds-Number k-ε Turbulence Model;Prediction;
 Language
Korean
 Cited by
 References
1.
AIAA Paper No. 82-0169, 1982.

2.
In Viscous Drag Reduction, 1980.

3.
In AGARD-VKI, Special Course on Skin Friction Drag Reduction, 1992.

4.
Journal of Fluid Mechanics, 1993. vol.250. pp.1-42

5.
Journal of Fluid Mechanics, 1993. vol.255. pp.503-539

6.
AIAA Paper No. 86-1127, 1986.

7.
Applied Scientific Research, 1993. vol.50. pp.283-298

8.
Near Wall Turbulence Flows, 1993. pp.739-748

9.
Letter in Heat and Mass Transfer, 1974. vol.1. pp.131-138

10.
대한기계학회논문집 B권, 1998. vol.22. 1, pp.93-103

11.
Journal of Fluid Mechanics, 1993. vol.250. pp.509-529

12.
Ph. D. Thesis, Dept. of Mechanical Engineering, UMIST, 1995.

13.
International Journal of Heat and Fluid Flow, 1996.

14.
Ph. D. Thesis, Dept. of Mechanical Engineering, UMIST, 1992.